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MCF8329A: The rotational speed is unstable at constant load, fluctuating at 2400-2600rad/min, resulting in unstable rear end pressure

lin tan
Prodigy 30 points
Part Number: MCF8329A
Other Parts Discussed in Thread: MCF8329EVM

Tool/software:

Hello, Dear TI Engineer, when using 8329 to drive a 5-pole compressor, the motor speed is unstable under the condition of constant load of 20psi (there is a pressure relief valve at the rear end), and there is a fluctuation of 200 rpm, resulting in unstable pressure on the pressure gauge. Try other chip drivers and find that it can be stable. I don't know if it's a problem with 8329 or a problem with its own configuration, it's a json file, please check it out.

{
"signature":"oneui-register-data",
"data":[
[
{
"idx":0,
"id":"ISD_CONFIG",
"value":"0xF4A2D4A1",
"addr":"0x00000080"
},
{
"idx":1,
"id":"REV_DRIVE_CONFIG",
"value":"0x48300000",
"addr":"0x00000082"
},
{
"idx":2,
"id":"MOTOR_STARTUP1",
"value":"0x0E2654C4",
"addr":"0x00000084"
},
{
"idx":3,
"id":"MOTOR_STARTUP2",
"value":"0xAC47C007",
"addr":"0x00000086"
},
{
"idx":4,
"id":"CLOSED_LOOP1",
"value":"0x1678843C",
"addr":"0x00000088"
},
{
"idx":5,
"id":"CLOSED_LOOP2",
"value":"0x8AFD4D41",
"addr":"0x0000008A"
},
{
"idx":6,
"id":"CLOSED_LOOP3",
"value":"0x28CA14B2",
"addr":"0x0000008C"
},
{
"idx":7,
"id":"CLOSED_LOOP4",
"value":"0xB28C87D0",
"addr":"0x0000008E"
},
{
"idx":8,
"id":"REF_PROFILES1",
"value":"0x23218669",
"addr":"0x00000094"
},
{
"idx":9,
"id":"REF_PROFILES2",
"value":"0x5668099B",
"addr":"0x00000096"
},
{
"idx":10,
"id":"REF_PROFILES3",
"value":"0x1F2F9660",
"addr":"0x00000098"
},
{
"idx":11,
"id":"REF_PROFILES4",
"value":"0x0019A6B3",
"addr":"0x0000009A"
},
{
"idx":12,
"id":"REF_PROFILES5",
"value":"0xA67339B8",
"addr":"0x0000009C"
},
{
"idx":13,
"id":"REF_PROFILES6",
"value":"0x007FFFC2",
"addr":"0x0000009E"
}
],
[
{
"idx":0,
"id":"FAULT_CONFIG1",
"value":"0x77F231A6",
"addr":"0x00000090"
},
{
"idx":1,
"id":"FAULT_CONFIG2",
"value":"0x71C22888",
"addr":"0x00000092"
}
],
[
{
"idx":0,
"id":"INT_ALGO_1",
"value":"0x09460015",
"addr":"0x000000A0"
},
{
"idx":1,
"id":"INT_ALGO_2",
"value":"0x00008321",
"addr":"0x000000A2"
}
],
[
{
"idx":0,
"id":"PIN_CONFIG",
"value":"0x40032300",
"addr":"0x000000A4"
},
{
"idx":1,
"id":"DEVICE_CONFIG1",
"value":"0x40100001",
"addr":"0x000000A6"
},
{
"idx":2,
"id":"DEVICE_CONFIG2",
"value":"0x03E8D00C",
"addr":"0x000000A8"
},
{
"idx":3,
"id":"PERI_CONFIG1",
"value":"0x52983E00",
"addr":"0x000000AA"
},
{
"idx":4,
"id":"GD_CONFIG1",
"value":"0x8000807B",
"addr":"0x000000AC"
},
{
"idx":5,
"id":"GD_CONFIG2",
"value":"0x80000066",
"addr":"0x000000AE"
}
],
[
{
"idx":0,
"id":"GATE_DRIVER_FAULT_STATUS",
"value":"0x00000000",
"addr":"0x000000E0"
},
{
"idx":1,
"id":"CONTROLLER_FAULT_STATUS",
"value":"0x00000000",
"addr":"0x000000E2"
}
],
[
{
"idx":0,
"id":"ALGO_STATUS",
"value":"0x1A5CFFE4",
"addr":"0x000000E4"
},
{
"idx":1,
"id":"MTR_PARAMS",
"value":"0x00000000",
"addr":"0x000000E6"
},
{
"idx":2,
"id":"ALGO_STATUS_MPET",
"value":"0x03000000",
"addr":"0x000000E8"
}
],
[
{
"idx":0,
"id":"ALGO_CTRL1",
"value":"0xAA500000",
"addr":"0x000000EA"
}
],
[
{
"idx":0,
"id":"ALGO_DEBUG1",
"value":"0x428E0000",
"addr":"0x000000EC"
},
{
"idx":1,
"id":"ALGO_DEBUG2",
"value":"0x00000000",
"addr":"0x000000EE"
},
{
"idx":2,
"id":"CURRENT_PI",
"value":"0x030503C8",
"addr":"0x000000F0"
},
{
"idx":3,
"id":"SPEED_PI",
"value":"0x03640264",
"addr":"0x000000F2"
},
{
"idx":4,
"id":"DAC_1",
"value":"0x00000000",
"addr":"0x000000F4"
}
],
[
{
"idx":0,
"id":"ALGORITHM_STATE",
"value":"0x00000000",
"addr":"0x00000196"
},
{
"idx":1,
"id":"FG_SPEED_FDBK",
"value":"0x01435E50",
"addr":"0x0000019C"
},
{
"idx":2,
"id":"BUS_CURRENT",
"value":"0x00000000",
"addr":"0x0000040E"
},
{
"idx":3,
"id":"PHASE_CURRENT_A",
"value":"0xFFF80000",
"addr":"0x0000043C"
},
{
"idx":4,
"id":"PHASE_CURRENT_B",
"value":"0xFF8F0000",
"addr":"0x0000043E"
},
{
"idx":5,
"id":"PHASE_CURRENT_C",
"value":"0x00790000",
"addr":"0x00000440"
},
{
"idx":6,
"id":"CSA_GAIN_FEEDBACK",
"value":"0x00000000",
"addr":"0x00000450"
},
{
"idx":7,
"id":"VOLTAGE_GAIN_FEEDBACK",
"value":"0x00000000",
"addr":"0x00000458"
},
{
"idx":8,
"id":"VM_VOLTAGE",
"value":"0x028B8000",
"addr":"0x0000045C"
},
{
"idx":9,
"id":"PHASE_VOLTAGE_VA",
"value":"0x02A6190E",
"addr":"0x00000460"
},
{
"idx":10,
"id":"PHASE_VOLTAGE_VB",
"value":"0x02A45DA6",
"addr":"0x00000462"
},
{
"idx":11,
"id":"PHASE_VOLTAGE_VC",
"value":"0x02A0E6D7",
"addr":"0x00000464"
},
{
"idx":12,
"id":"SIN_COMMUTATION_ANGLE",
"value":"0xF8749B50",
"addr":"0x000004AA"
},
{
"idx":13,
"id":"COS_COMMUTATION_ANGLE",
"value":"0x02A38318",
"addr":"0x000004AC"
},
{
"idx":14,
"id":"IALPHA",
"value":"0x03220000",
"addr":"0x000004CC"
},
{
"idx":15,
"id":"IBETA",
"value":"0xFF383C9F",
"addr":"0x000004CE"
},
{
"idx":16,
"id":"VALPHA",
"value":"0x0051CC11",
"addr":"0x000004D0"
},
{
"idx":17,
"id":"VBETA",
"value":"0x006AC74A",
"addr":"0x000004D2"
},
{
"idx":18,
"id":"ID",
"value":"0x0197D8DE",
"addr":"0x000004DC"
},
{
"idx":19,
"id":"IQ",
"value":"0x02CD9EDF",
"addr":"0x000004DE"
},
{
"idx":20,
"id":"VD",
"value":"0xFFB62539",
"addr":"0x000004E0"
},
{
"idx":21,
"id":"VQ",
"value":"0x00709108",
"addr":"0x000004E2"
},
{
"idx":22,
"id":"IQ_REF_ROTOR_ALIGN",
"value":"0x00000000",
"addr":"0x0000051A"
},
{
"idx":23,
"id":"SPEED_REF_OPEN_LOOP",
"value":"0x00000000",
"addr":"0x00000532"
},
{
"idx":24,
"id":"IQ_REF_OPEN_LOOP",
"value":"0x02665D58",
"addr":"0x00000542"
},
{
"idx":25,
"id":"SPEED_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x000005D0"
},
{
"idx":26,
"id":"ID_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x0000060A"
},
{
"idx":27,
"id":"IQ_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x0000060C"
},
{
"idx":28,
"id":"ISD_STATE",
"value":"0x00000005",
"addr":"0x000006B0"
},
{
"idx":29,
"id":"ISD_SPEED",
"value":"0x0000006C",
"addr":"0x000006BA"
},
{
"idx":30,
"id":"IPD_STATE",
"value":"0x00000000",
"addr":"0x000006E4"
},
{
"idx":31,
"id":"IPD_ANGLE",
"value":"0x00000000",
"addr":"0x0000071A"
},
{
"idx":32,
"id":"ED",
"value":"0x00000000",
"addr":"0x0000075C"
},
{
"idx":33,
"id":"EQ",
"value":"0x00000000",
"addr":"0x0000075E"
},
{
"idx":34,
"id":"SPEED_FDBK",
"value":"0x00000000",
"addr":"0x0000076E"
},
{
"idx":35,
"id":"THETA_EST",
"value":"0x00000000",
"addr":"0x00000774"
}
]
]
}

  • +1
    TI__Mastermind 26090 points

    Hi lin,

    I see that you have values programmed for the current loop gains. I would like to mention that leaving the current loop gains at 0 (CURR_LOOP_KP and CURR_LOOP_KI) will let the MCF8329A automatically determine current loop gains every time the MCF8329A is started. These gains are generally good for most applications but in some cases manually setting these gains is needed to increase performance of the motor. I also see that the speed loop gains are different from the speed loop gains that were measured by MPET. 

    1. If you have not tried this already can you set the speed loop and current loop speed gains to 0. After setting these values to zero, keep the load connected to the motor and provide a speed command to the motor. This will force the motor to automatically determine good speed loop gains for your motor which may help improve the speed loop stability.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    Hello, after debugging, although the fluctuation is still very large, it has improved. I also have a problem, MPET often does not work properly, especially in the case of load, there will be a situation that keeps spinning, so I grope for the speed loop pi, I know this is not accurate. Ask how to get the MPET to function properly with load，thanks。

  • 0 in reply to lin tan
    TI__Mastermind 26090 points
    lin tan said:
    I also have a problem, MPET often does not work properly, especially in the case of load, there will be a situation that keeps spinning

    If MPET is reporting a fault please tell me which fault is being reported. If MPET keeps spinning the motor for > 5 minutes then the closed loop tuning page in Motor Studio can be used to determine good speed loop values.

    For using the Closed loop tuning page:

    1. Set the Control Mode to Current Control. This makes it so that the I2C speed command will apply (ILIMIT_setting * I2C_%) current to the motor.
    2. Go to the Closed Loop Tuning Page and go to Motor Characteristics.
    3. Enable Hi-Z using the switch up top
    4. Fill out the table by setting a I2C speed command, measuring the motor current (in Amps) and motor speed (in electrical Hz)
    5. Fill out the coast time by having the motor run at a set speed for a while and then set a zero command. Measure the time it takes for the motor to reach a non-zero speed (in seconds)
    6. Go to speed loop tab to see the recommended speed loop gain settings

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    I tried the steps you said, the fifth step measure motor characteristics will not start after pressing, of course this may be normal, then I turned on the mpet, the motor started and then kept it unchanged at about 150hz, even if it was a long time later, it would not change, the motor would not stop, and the mpet did not report an error. Below is the test page.

    In the end, I tried changing the initial speed and final speed parameters in the motor operation tuning section of the speed loop, but found no change.

  • 0 in reply to lin tan
    Prodigy 30 points

    Could it be that there is a problem with the register settings? You can send me a json file with a good configuration, I can change the motor parameters and try it.

  • +1 in reply to lin tan
    TI__Mastermind 26090 points
    lin tan said:
    I tried the steps you said, the fifth step measure motor characteristics will not start after pressing, of course this may be normal

    Sorry I did not make this more clear. This closed loop tuning page needs to be filled out manually. The values that are in the page are example values and should not be used since these values will vary depending on the motor. The table, motor resistance, inductance, BEMF, and the initial and final speed all need to be filled out based on measurements with and LCR meter and oscilloscope.

    lin tan said:
    You can send me a json file with a good configuration, I can change the motor parameters and try it.

    Below are a couple of register configurations you can try. Please be sure to check the BASE_CURRENT and all Current Limit settings to prevent accidental damage to your system. Also, after downloading these files, please make sure to delete any periods in the file name or Motor Studio will not recognize the file

    Configuration used for Vacuum cleaners:

    Fullscreen 1817.Default Registers MCF8329A.json Download 
    {
"signature":"oneui-register-data",
"data":[
[
{
"idx":0,
"id":"ISD_CONFIG",
"value":"0X64A2D4A1",
"addr":"0x00000080"
},
{
"idx":1,
"id":"REV_DRIVE_CONFIG",
"value":"0x48300000",
"addr":"0x00000082"
},
{
"idx":2,
"id":"MOTOR_STARTUP1",
"value":"0x10A64CC0",
"addr":"0x00000084"
},
{
"idx":3,
"id":"MOTOR_STARTUP2",
"value":"0x2D81C007",
"addr":"0x00000086"
},
{
"idx":4,
"id":"CLOSED_LOOP1",
"value":"0x1D7181B8",
"addr":"0x00000088"
},
{
"idx":5,
"id":"CLOSED_LOOP2",
"value":"0x0AAD0000",
"addr":"0x0000008A"
},
{
"idx":6,
"id":"CLOSED_LOOP3",
"value":"0x00000000",
"addr":"0x0000008C"
},
{
"idx":7,
"id":"CLOSED_LOOP4",
"value":"0x000004B0",
"addr":"0x0000008E"
},
{
"idx":8,
"id":"REF_PROFILES1",
"value":"0x00000000",
"addr":"0x00000094"
},
{
"idx":9,
"id":"REF_PROFILES2",
"value":"0x00000000",
"addr":"0x00000096"
},
{
"idx":10,
"id":"REF_PROFILES3",
"value":"0x00000004",
"addr":"0x00000098"
},
{
"idx":11,
"id":"REF_PROFILES4",
"value":"0x00000000",
"addr":"0x0000009A"
},
{
"idx":12,
"id":"REF_PROFILES5",
"value":"0x00000000",
"addr":"0x0000009C"
},
{
"idx":13,
"id":"REF_PROFILES6",
"value":"0x00000000",
"addr":"0x0000009E"
}
],
[
{
"idx":0,
"id":"FAULT_CONFIG1",
"value":"0x465A31A6",
"addr":"0x00000090"
},
{
"idx":1,
"id":"FAULT_CONFIG2",
"value":"0x71422888",
"addr":"0x00000092"
}
],
[
{
"idx":0,
"id":"INT_ALGO_1",
"value":"0x0946027D",
"addr":"0x000000A0"
},
{
"idx":1,
"id":"INT_ALGO_2",
"value":"0x020082E3",
"addr":"0x000000A2"
}
],
[
{
"idx":0,
"id":"PIN_CONFIG",
"value":"0x40032309",
"addr":"0x000000A4"
},
{
"idx":1,
"id":"DEVICE_CONFIG1",
"value":"0x00100002",
"addr":"0x000000A6"
},
{
"idx":2,
"id":"DEVICE_CONFIG2",
"value":"0x03E8C00C",
"addr":"0x000000A8"
},
{
"idx":3,
"id":"PERI_CONFIG1",
"value":"0x69845CC0",
"addr":"0x000000AA"
},
{
"idx":4,
"id":"GD_CONFIG1",
"value":"0x0000807B",
"addr":"0x000000AC"
},
{
"idx":5,
"id":"GD_CONFIG2",
"value":"0x00000400",
"addr":"0x000000AE"
}
],
[
{
"idx":0,
"id":"GATE_DRIVER_FAULT_STATUS",
"value":"0x00000000",
"addr":"0x000000E0"
},
{
"idx":1,
"id":"CONTROLLER_FAULT_STATUS",
"value":"0x00000000",
"addr":"0x000000E2"
}
],
[
{
"idx":0,
"id":"ALGO_STATUS",
"value":"0x00000000",
"addr":"0x000000E4"
},
{
"idx":1,
"id":"MTR_PARAMS",
"value":"0x00000000",
"addr":"0x000000E6"
},
{
"idx":2,
"id":"ALGO_STATUS_MPET",
"value":"0x00000000",
"addr":"0x000000E8"
}
],
[
{
"idx":0,
"id":"ALGO_CTRL1",
"value":"0x00000000",
"addr":"0x000000EA"
}
],
[
{
"idx":0,
"id":"ALGO_DEBUG1",
"value":"0x80000000",
"addr":"0x000000EC"
},
{
"idx":1,
"id":"ALGO_DEBUG2",
"value":"0x00000000",
"addr":"0x000000EE"
},
{
"idx":2,
"id":"CURRENT_PI",
"value":"0x00000000",
"addr":"0x000000F0"
},
{
"idx":3,
"id":"SPEED_PI",
"value":"0x00000000",
"addr":"0x000000F2"
},
{
"idx":4,
"id":"DAC_1",
"value":"0x00000000",
"addr":"0x000000F4"
}
],
[
{
"idx":0,
"id":"ALGORITHM_STATE",
"value":"0x00000000",
"addr":"0x00000196"
},
{
"idx":1,
"id":"FG_SPEED_FDBK",
"value":"0x00000000",
"addr":"0x0000019C"
},
{
"idx":2,
"id":"BUS_CURRENT",
"value":"0x00000000",
"addr":"0x0000040E"
},
{
"idx":3,
"id":"PHASE_CURRENT_A",
"value":"0x00000000",
"addr":"0x0000043C"
},
{
"idx":4,
"id":"PHASE_CURRENT_B",
"value":"0x00000000",
"addr":"0x0000043E"
},
{
"idx":5,
"id":"PHASE_CURRENT_C",
"value":"0x00000000",
"addr":"0x00000440"
},
{
"idx":6,
"id":"CSA_GAIN_FEEDBACK",
"value":"0x00000000",
"addr":"0x00000450"
},
{
"idx":7,
"id":"VOLTAGE_GAIN_FEEDBACK",
"value":"0x00000000",
"addr":"0x00000458"
},
{
"idx":8,
"id":"VM_VOLTAGE",
"value":"0x00000000",
"addr":"0x0000045C"
},
{
"idx":9,
"id":"PHASE_VOLTAGE_VA",
"value":"0x00000000",
"addr":"0x00000460"
},
{
"idx":10,
"id":"PHASE_VOLTAGE_VB",
"value":"0x00000000",
"addr":"0x00000462"
},
{
"idx":11,
"id":"PHASE_VOLTAGE_VC",
"value":"0x00000000",
"addr":"0x00000464"
},
{
"idx":12,
"id":"SIN_COMMUTATION_ANGLE",
"value":"0x00000000",
"addr":"0x000004AA"
},
{
"idx":13,
"id":"COS_COMMUTATION_ANGLE",
"value":"0x00000000",
"addr":"0x000004AC"
},
{
"idx":14,
"id":"IALPHA",
"value":"0x00000000",
"addr":"0x000004CC"
},
{
"idx":15,
"id":"IBETA",
"value":"0x00000000",
"addr":"0x000004CE"
},
{
"idx":16,
"id":"VALPHA",
"value":"0x00000000",
"addr":"0x000004D0"
},
{
"idx":17,
"id":"VBETA",
"value":"0x00000000",
"addr":"0x000004D2"
},
{
"idx":18,
"id":"ID",
"value":"0x00000000",
"addr":"0x000004DC"
},
{
"idx":19,
"id":"IQ",
"value":"0x00000000",
"addr":"0x000004DE"
},
{
"idx":20,
"id":"VD",
"value":"0x00000000",
"addr":"0x000004E0"
},
{
"idx":21,
"id":"VQ",
"value":"0x00000000",
"addr":"0x000004E2"
},
{
"idx":22,
"id":"IQ_REF_ROTOR_ALIGN",
"value":"0x00000000",
"addr":"0x0000051A"
},
{
"idx":23,
"id":"SPEED_REF_OPEN_LOOP",
"value":"0x00000000",
"addr":"0x00000532"
},
{
"idx":24,
"id":"IQ_REF_OPEN_LOOP",
"value":"0x00000000",
"addr":"0x00000542"
},
{
"idx":25,
"id":"SPEED_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x000005D0"
},
{
"idx":26,
"id":"ID_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x0000060A"
},
{
"idx":27,
"id":"IQ_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x0000060C"
},
{
"idx":28,
"id":"ISD_STATE",
"value":"0x00000000",
"addr":"0x000006B0"
},
{
"idx":29,
"id":"ISD_SPEED",
"value":"0x00000000",
"addr":"0x000006BA"
},
{
"idx":30,
"id":"IPD_STATE",
"value":"0x00000000",
"addr":"0x000006E4"
},
{
"idx":31,
"id":"IPD_ANGLE",
"value":"0x00000000",
"addr":"0x0000071A"
},
{
"idx":32,
"id":"ED",
"value":"0x00000000",
"addr":"0x0000075C"
},
{
"idx":33,
"id":"EQ",
"value":"0x00000000",
"addr":"0x0000075E"
},
{
"idx":34,
"id":"SPEED_FDBK",
"value":"0x00000000",
"addr":"0x0000076E"
},
{
"idx":35,
"id":"THETA_EST",
"value":"0x00000000",
"addr":"0x00000774"
}
]
]
}

    Configuration used for High Speed Drills:

    Fullscreen High_Speed_Drill_MCF8329A .json Download 
    {
"signature":"oneui-register-data",
"data":[
[
{
"idx":0,
"id":"ISD_CONFIG",
"value":"0x64A2D4A1",
"addr":"0x00000080"
},
{
"idx":1,
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{
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"addr":"0x0000009E"
}
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[
{
"idx":0,
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"value":"0x47FA31A6",
"addr":"0x00000090"
},
{
"idx":1,
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"value":"0x71422888",
"addr":"0x00000092"
}
],
[
{
"idx":0,
"id":"INT_ALGO_1",
"value":"0x0944007D",
"addr":"0x000000A0"
},
{
"idx":1,
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"value":"0x02008223",
"addr":"0x000000A2"
}
],
[
{
"idx":0,
"id":"PIN_CONFIG",
"value":"0x40032309",
"addr":"0x000000A4"
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{
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"value":"0x00100002",
"addr":"0x000000A6"
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{
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"addr":"0x000000A8"
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{
"idx":3,
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"value":"0x69845CC0",
"addr":"0x000000AA"
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{
"idx":4,
"id":"GD_CONFIG1",
"value":"0x00008079",
"addr":"0x000000AC"
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{
"idx":5,
"id":"GD_CONFIG2",
"value":"0x00000200",
"addr":"0x000000AE"
}
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"idx":0,
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"value":"0x01000000",
"addr":"0x000000E0"
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"idx":1,
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"addr":"0x000000E8"
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{
"idx":0,
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"value":"0x00000000",
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{
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[
{
"idx":0,
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"value":"0x0000000E",
"addr":"0x00000196"
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{
"idx":1,
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{
"idx":2,
"id":"BUS_CURRENT",
"value":"0x00000000",
"addr":"0x0000040E"
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{
"idx":3,
"id":"PHASE_CURRENT_A",
"value":"0xFFF80000",
"addr":"0x0000043C"
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{
"idx":4,
"id":"PHASE_CURRENT_B",
"value":"0xFFE80000",
"addr":"0x0000043E"
},
{
"idx":5,
"id":"PHASE_CURRENT_C",
"value":"0x00200000",
"addr":"0x00000440"
},
{
"idx":6,
"id":"CSA_GAIN_FEEDBACK",
"value":"0x00000002",
"addr":"0x00000450"
},
{
"idx":7,
"id":"VOLTAGE_GAIN_FEEDBACK",
"value":"0x00000000",
"addr":"0x00000458"
},
{
"idx":8,
"id":"VM_VOLTAGE",
"value":"0x066C8000",
"addr":"0x0000045C"
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{
"idx":9,
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"value":"0x02E2B83B",
"addr":"0x00000460"
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{
"idx":10,
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"value":"0x02DD8604",
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{
"idx":11,
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{
"idx":12,
"id":"SIN_COMMUTATION_ANGLE",
"value":"0xFFFED220",
"addr":"0x000004AA"
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{
"idx":13,
"id":"COS_COMMUTATION_ANGLE",
"value":"0x07FFF000",
"addr":"0x000004AC"
},
{
"idx":14,
"id":"IALPHA",
"value":"0xFFF80000",
"addr":"0x000004CC"
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{
"idx":15,
"id":"IBETA",
"value":"0x000DDB3D",
"addr":"0x000004CE"
},
{
"idx":16,
"id":"VALPHA",
"value":"0x00006E39",
"addr":"0x000004D0"
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{
"idx":17,
"id":"VBETA",
"value":"0x00210152",
"addr":"0x000004D2"
},
{
"idx":18,
"id":"ID",
"value":"0xFFF5F000",
"addr":"0x000004DC"
},
{
"idx":19,
"id":"IQ",
"value":"0x000C6957",
"addr":"0x000004DE"
},
{
"idx":20,
"id":"VD",
"value":"0x0000695F",
"addr":"0x000004E0"
},
{
"idx":21,
"id":"VQ",
"value":"0x002101A6",
"addr":"0x000004E2"
},
{
"idx":22,
"id":"IQ_REF_ROTOR_ALIGN",
"value":"0x00000000",
"addr":"0x0000051A"
},
{
"idx":23,
"id":"SPEED_REF_OPEN_LOOP",
"value":"0x00000000",
"addr":"0x00000532"
},
{
"idx":24,
"id":"IQ_REF_OPEN_LOOP",
"value":"0x03332720",
"addr":"0x00000542"
},
{
"idx":25,
"id":"SPEED_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x000005D0"
},
{
"idx":26,
"id":"ID_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x0000060A"
},
{
"idx":27,
"id":"IQ_REF_CLOSED_LOOP",
"value":"0x046310D3",
"addr":"0x0000060C"
},
{
"idx":28,
"id":"ISD_STATE",
"value":"0x00000005",
"addr":"0x000006B0"
},
{
"idx":29,
"id":"ISD_SPEED",
"value":"0x00E0E8B3",
"addr":"0x000006BA"
},
{
"idx":30,
"id":"IPD_STATE",
"value":"0x00000000",
"addr":"0x000006E4"
},
{
"idx":31,
"id":"IPD_ANGLE",
"value":"0x00000000",
"addr":"0x0000071A"
},
{
"idx":32,
"id":"ED",
"value":"0x00000000",
"addr":"0x0000075C"
},
{
"idx":33,
"id":"EQ",
"value":"0x00000000",
"addr":"0x0000075E"
},
{
"idx":34,
"id":"SPEED_FDBK",
"value":"0x00000000",
"addr":"0x0000076E"
},
{
"idx":35,
"id":"THETA_EST",
"value":"0x00000000",
"addr":"0x00000774"
}
]
]
}

    Regards,

    Joshua

  • +1 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    Ok, thanks for the reply, this was helpful for us to solve the problem. I have two other questions for a professional engineer. 1. When I take the initiative to adjust the current loop pi, if I set kp=0.6, ki=20, the phase current presents large and small waves, four pole compressors, the phase current is a large wave and a small wave cycle, the peak difference can be more than 3 times, is this normal? If I kp=0.6 and ki=1500, the phase current waveform tends to be sinusoidal, the difference between the large wave and the small wave is not obvious, the peak is almost the same, and it is more gentle, which is the same as setting kp and ki to 0 ,the effect is similar, and I would like to ask what is the reason for this situation. Attached phase current picture.kp=0.6,ki=20kp=0.6,ki=20,Noticeable large and small waves，Power consumption is also higher.

    kp=0.6，ki=1500.The large and small waves disappear and the power consumption decreases.

    kp=0,ki=0,The effect is pretty much the same.


    2. I see that you have an adjustment BASE_CURRENT, for example, change it to 200 or 400, I refer to the specification and find that it is related to the base current, the sampling resistance and the CSA_GAIN, CSA_GAIN I set it to 40v/v, and the sampling resistance is 1mΩ of the development board, so how should the base current be determined, I refer to the introductory video, and I get BASE_CURRENT=66 with 1.5A as the base current, and the motor starts very smoothly. My doubts are, how to determine the base current, is it just 1.5A, and I set the BASE_CURRENT=66 right?

  • 0 in reply to lin tan
    TI__Mastermind 26090 points

    1. When the Current loop gains are set to zero in the CLOSED_LOOP3 register the current loop gains used by the algorithm will be determined automatically. In the image below, despite CLOSED_LOOP3 having the Current loop gains set to zero, the current loop gains used by the internal algorithm are non-zero:

    Likely 20 for the integral gain for the Current Loop is too small to mitigate the aggressiveness of 0.6 for the proportional gain while 1500 for the integral gain dampened the rise enough to stop the oscillation that was occurring. Determining good gain settings is mostly trial and error unfortunately but tools like the closed loop tuning page can help to determine a good value. If you would like to know more you may have to look into PI loops in general since this can be a complex topic to cover.

    2. Below is the latest version of the MCF8329A Tuning Guide. Section 5.1.2 covers how to set BASE_CURRENT. BASE_CURRENT sets what the max voltage output by the internal Current Sense Amplifier (CSA) is equal to. The MCF8329A's CSA is bi-directional with an output range from 0 to 3V so 1.5V is equals the max current output. 

    To determine BASE_CURRENT, you take the equation ( MOTOR'S_RATED_MAX_CURRENT = 1.5 / ( CSA_GAIN * RSENSE ) ) and you determine a CSA_GAIN and RSENSE value which gets you close, but not less than, you motors max rated peak phase current. You then take the result of the equation for this equation ( (1.5 / ( CSA_GAIN * RSENSE ) ) * ( 32768/1200 ) ), convert than value into Hexadecimal and put that into the BASE_CURRENT bit field.

    If your motors max current is 1.5A, then I would recommend changing the RSENSE to something higher like 30 mOhm and using a CSA_GAIN of 20 V/V so that the max CSA output is equal to 2.5A which will mean BASE_CURRENT needs to be set to 0x45.

    MCF8329A_TuningGuideDraft5.pdf

     Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    Dear TI Engineer, I read the CSA gain and resistor selection section in detail, and I still don't understand it very well. Follow the formula
    RSENSE =(VSO −VREF/2)/
    CSA_GAIN × I, VSO takes 3V, that is, RSENSE = 1.5/CSA_GAIN × I, here I is the peak phase current, our motor is about 8A peak, so how much should the CSA_GAIN here be appropriate? Assuming that 40vv is taken, that is, RSENSE = 1.5/40*8 = 0.0046875Ω, does it mean that I should choose a 5mΩ resistor, which means that the original 1mΩ on the EVM cannot meet the needs at all, so it is not accurate to measure with the EVM board.

  • 0 in reply to lin tan
    Prodigy 30 points

    If I select a 5mΩ resistor as calculated above, should my BASE_CURRENT be =1.5/(RSENSE × CSA_GAIN)=0x14?

  • 0 in reply to lin tan
    TI__Mastermind 26090 points
    lin tan said:
    Assuming that 40vv is taken, that is, RSENSE = 1.5/40*8 = 0.0046875Ω, does it mean that I should choose a 5mΩ resistor

    Using a 5mOhm resistor would lead to the max current being 7.5A With 1.5/(40*.005) = 7.5A. This is lower than your motors peak current which may limit your motors max speed and torque. Instead you could use 4 mOhms so that the max current of the CSA is 9.375A.

    lin tan said:
    If I select a 5mΩ resistor as calculated above, should my BASE_CURRENT be =1.5/(RSENSE × CSA_GAIN)=0x14?

    With a CSA_GAIN of 40 and a resistor of 5 mOhms, BASE_CURRENT = 0xCC since 1.5/(.005 * 40) = 7.5 * (32768/1200) = 204 (rounded) = 0xCC.

    With a CSA_GAIN of 40 and a resistor of 4 mOhms, BASE_CURRENT = 0xCC since 1.5/(.004 * 40) = 9.375 * (32768/1200) = 256 = 0x100.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    So if I still use 1mΩ, the csa is still 40V/V, BASE_CURRENT=37.5 * (32768/1200)=1020=0x3FC, is that right?

  • 0 in reply to lin tan
    Prodigy 30 points

    The resistance of the development board is R001, which is 1mΩ, and I am a little unconfident, because the starting effect of the motor with 0x3FC is not as good as that of the 0x66, and it often fails to start

  • +1 in reply to lin tan
    TI__Mastermind 26090 points
    lin tan said:
    So if I still use 1mΩ, the csa is still 40V/V, BASE_CURRENT=37.5 * (32768/1200)=1020=0x3FC, is that right?

    Your understanding is correct and the value for BASE_CURRENT is correct assuming 1020 is the correct result. When I calculate 37.5 * (32768/1200) I get 1024 which is 0x400.

    lin tan said:
    The resistance of the development board is R001, which is 1mΩ, and I am a little unconfident, because the starting effect of the motor with 0x3FC is not as good as that of the 0x66, and it often fails to start

    Can you send an image of the MCF8329EVM board? We corrected and issue the default resistor where the resistors package parasitics were leading to issues with the CSA measurement. We updated the MCF8329EVM boards but I would like to make sure that the EVM you have does not have the old resistor on it.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    . Ok, I have one more question.

    If I  use 4mΩ, the csa is  40V/V, BASE_CURRENT=0x100,Will the effect of motor control be more accurate?

  • +1 in reply to lin tan
    TI__Mastermind 26090 points

    The EVM you have has the resistor which has led to current regulation issues due to its package parasitics. I recommend to change this resistor with the CRE2512-FZ-R001E-3 or another resistor.

    lin tan said:
    If I  use 4mΩ, the csa is  40V/V, BASE_CURRENT=0x100,Will the effect of motor control be more accurate?

    The motor control should be more accurate if you change the resistor and use the settings you described.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    ok,I can try it.I have one more question.Is there any way to say that this default curve is a polyline, and if I make it a straight line, will there be any instability or other drawbacks?

  • +1 in reply to lin tan
    TI__Mastermind 26090 points

    Making the line straight for the linear speed profile should not cause any issues with stability. If you would like to know more about what is being changed by modifying this graph please reference section 7.3.7.5.1 of the MCF8329A datasheet.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    Well, we've run into a new problem where trying to post new topics always causes me to edit them, so would it be okay if I continue posting questions here? Sorry about that.

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    We are developing a wind turbine, and we hope it can accelerate from 6,000 RPM to 25,000 RPM in just 0.1 seconds. However, even if I set CL_ACC to unrestricted, it takes about 0.8 seconds at the fastest and the phase current waveform has certain spikes and ripples. We tried other drives and found that they can achieve 0.1 seconds and have very sinusoidal and smooth waveforms without spikes. So I think the 8329A can also do it, and I want to know how to configure it to achieve this.

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    This is the waveform I adjusted. You can see a lot of spikes and the speed of the speed increase is also slow. The waveform is also not very sinusoidal。 The waveform is even more strange when accelerating。

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    It's something else, and the acceleration is very fast and stable

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points 

    {
"signature":"oneui-register-data",
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},
{
"idx":10,
"id":"PHASE_VOLTAGE_VB",
"value":"0x00014C8D",
"addr":"0x00000462"
},
{
"idx":11,
"id":"PHASE_VOLTAGE_VC",
"value":"0x00006ED9",
"addr":"0x00000464"
},
{
"idx":12,
"id":"SIN_COMMUTATION_ANGLE",
"value":"0x00B06454",
"addr":"0x000004AA"
},
{
"idx":13,
"id":"COS_COMMUTATION_ANGLE",
"value":"0x07F6C174",
"addr":"0x000004AC"
},
{
"idx":14,
"id":"IALPHA",
"value":"0xFF9B0000",
"addr":"0x000004CC"
},
{
"idx":15,
"id":"IBETA",
"value":"0x058CDBE6",
"addr":"0x000004CE"
},
{
"idx":16,
"id":"VALPHA",
"value":"0x0029A20E",
"addr":"0x000004D0"
},
{
"idx":17,
"id":"VBETA",
"value":"0x00AE80CD",
"addr":"0x000004D2"
},
{
"idx":18,
"id":"ID",
"value":"0xFFFB558B",
"addr":"0x000004DC"
},
{
"idx":19,
"id":"IQ",
"value":"0x058EA6B8",
"addr":"0x000004DE"
},
{
"idx":20,
"id":"VD",
"value":"0x00389095",
"addr":"0x000004E0"
},
{
"idx":21,
"id":"VQ",
"value":"0x00AA6685",
"addr":"0x000004E2"
},
{
"idx":22,
"id":"IQ_REF_ROTOR_ALIGN",
"value":"0x01999390",
"addr":"0x0000051A"
},
{
"idx":23,
"id":"SPEED_REF_OPEN_LOOP",
"value":"0x00601D68",
"addr":"0x00000532"
},
{
"idx":24,
"id":"IQ_REF_OPEN_LOOP",
"value":"0x01999390",
"addr":"0x00000542"
},
{
"idx":25,
"id":"SPEED_REF_CLOSED_LOOP",
"value":"0x00000000",
"addr":"0x000005D0"
},
{
"idx":26,
"id":"ID_REF_CLOSED_LOOP",
"value":"0xFFF21B1C",
"addr":"0x0000060A"
},
{
"idx":27,
"id":"IQ_REF_CLOSED_LOOP",
"value":"0x05997350",
"addr":"0x0000060C"
},
{
"idx":28,
"id":"ISD_STATE",
"value":"0x00000005",
"addr":"0x000006B0"
},
{
"idx":29,
"id":"ISD_SPEED",
"value":"0x0000004E",
"addr":"0x000006BA"
},
{
"idx":30,
"id":"IPD_STATE",
"value":"0x00000000",
"addr":"0x000006E4"
},
{
"idx":31,
"id":"IPD_ANGLE",
"value":"0x00000000",
"addr":"0x0000071A"
},
{
"idx":32,
"id":"ED",
"value":"0xFFF7B503",
"addr":"0x0000075C"
},
{
"idx":33,
"id":"EQ",
"value":"0x00274444",
"addr":"0x0000075E"
},
{
"idx":34,
"id":"SPEED_FDBK",
"value":"0x00000000",
"addr":"0x0000076E"
},
{
"idx":35,
"id":"THETA_EST",
"value":"0xB81BAC3D",
"addr":"0x00000774"
}
]
]
}
    This is my json file, please consult and correct the problem. I think you will definitely say why I set the current loop pi to 0, because I tried, but once it is set to 0, the HW_LOCK_ILIMIT will be triggered when the speed is increased instantaneously, so I can only set the pi myself. Again, I think you'll wonder why BASE_CURRENT didn't set it to 0x400, because I tried and found that as long as it was greater than 0x66, it was easy to fail to start, even the most basic positioning, let alone open loop

  • +1 in reply to lin tan
    TI__Mastermind 26090 points

    Hi lin,

    Please create a new post for this topic using the "Ask a related question" button in the top right of the E2E page. This helps in many ways such as to to help others with similar problems find the solution and make understanding the history of the issue easier. 

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    As I said, every time I send a new one, I will ask me to edit the information, and it is useless to edit it, and I can't send a new one at all. I just want to know the most important thing, whether the 8329 can achieve an acceleration from 6000 to 30,000 rpm in 0.1s, solve the problem first, it's urgent

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    Is it okay to solve this problem first, don't worry about whether to send a new one, it's very urgent, it's urgent

  • 0 in reply to lin tan
    TI__Mastermind 26090 points

    Hi lin,

    Unfortunately, I am no longer with the team which supports BLDC motor drivers. I will help assign a BLDC motor drivers engineer to this thread so they can assist you with this problem. Please anticipate a response by tomorrow at the latest.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 30 points

    ？？？Where do people go?

  • 0 in reply to lin tan
    TI__Mastermind 24992 points

    Hi Lin,

    Request t0 start new thread for this topic, it helps us to improve to track open threads and re use the conversation which solved similar issues.

    I will attend the new thread which you can help by creating, sorry for the inconvenience and appreciate your support.

    Thanks and Best Regards

    Venkatadri S