MCF8316AEVM: Motor rotates inconsistently

Linus R.

Part Number: MCF8316AEVM

Hello,

the Motor sometimes works very well even after disconnecting the power supply and sometimes it does not start at all or only poorly and there are error messages displayed.

The supply settings have not been changed. All settings should be stored in the EPROM. What could be the mistake or what am I doing wrong?

Best,

Linus

over 2 years ago

0 Hong Khor over 2 years ago

TI__Intellectual 1240 points

Hi Linus,

May you specify which errors you are getting when the motor does not work?

Regards,

Hong

0 Linus R. over 2 years ago in reply to Hong Khor

Prodigy 40 points

Hi Hong,

sure. After I parameterize the engine it starts well. Even after I have disconnected the power supply and reconnected it everything still works. But after a day without use under the same conditions, it does not always start reliably. Also the start-up behavior has changed this is no longer as gentle as it was programmed but rather rough. Sometimes it does not start at all and gives the error message Abnormal BEMF Fault. What am I doing?

Best,

Linus

0 Hong Khor over 2 years ago in reply to Linus R.

TI__Intellectual 1240 points

Hi Linus,

There could be a few reasons for the behavior. Could you upload your JSON file (File > Save Registers) so we can look at your settings?

Best,

Hong

0 Linus R. over 2 years ago in reply to Hong Khor

Prodigy 40 points

Hi Hong,

I've attached two files. One of the files is the state of the register where everything has worked smoothly even after disconnecting the power supply.

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{
  "signature": "oneui-register-data",
  "data": [
    [
      {
        "idx": 0,
        "id": "isd_config",
        "value": "0x44638C20"
      },
      {
        "idx": 1,
        "id": "rev_drive_config",
        "value": "0x283AF064"
      },
      {
        "idx": 2,
        "id": "motor_startup1",
        "value": "0x4B68DDC0"
      },
      {
        "idx": 3,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

{
  "signature": "oneui-register-data",
  "data": [
    [
      {
        "idx": 0,
        "id": "isd_config",
        "value": "0x44638C20"
      },
      {
        "idx": 1,
        "id": "rev_drive_config",
        "value": "0x283AF064"
      },
      {
        "idx": 2,
        "id": "motor_startup1",
        "value": "0x4B68DDC0"
      },
      {
        "idx": 3,
        "id": "motor_startup2",
        "value": "0x24AE6000"
      },
      {
        "idx": 4,
        "id": "closed_loop1",
        "value": "0x1A3181B0"
      },
      {
        "idx": 5,
        "id": "closed_loop2",
        "value": "0x1AAD6E3C"
      },
      {
        "idx": 6,
        "id": "closed_loop3",
        "value": "0x0C800002"
      },
      {
        "idx": 7,
        "id": "closed_loop4",
        "value": "0x26898708"
      },
      {
        "idx": 8,
        "id": "speed_profiles1",
        "value": "0x00000000"
      },
      {
        "idx": 9,
        "id": "speed_profiles2",
        "value": "0x00000000"
      },
      {
        "idx": 10,
        "id": "speed_profiles3",
        "value": "0x00000000"
      },
      {
        "idx": 11,
        "id": "speed_profiles4",
        "value": "0x00000000"
      },
      {
        "idx": 12,
        "id": "speed_profiles5",
        "value": "0x00000000"
      },
      {
        "idx": 13,
        "id": "speed_profiles6",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "fault_config1",
        "value": "0x6FE80206"
      },
      {
        "idx": 1,
        "id": "fault_config2",
        "value": "0x74000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "pin_config",
        "value": "0x00000001"
      },
      {
        "idx": 1,
        "id": "device_config1",
        "value": "0x00100000"
      },
      {
        "idx": 2,
        "id": "device_config2",
        "value": "0x0000B000"
      },
      {
        "idx": 3,
        "id": "peri_config1",
        "value": "0x40000000"
      },
      {
        "idx": 4,
        "id": "gd_config1",
        "value": "0x00000100"
      },
      {
        "idx": 5,
        "id": "gd_config2",
        "value": "0x00200000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "ana_trim3",
        "value": "0x48004800"
      },
      {
        "idx": 1,
        "id": "ana_trim4",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "ana_trim5",
        "value": "0x0000000C"
      },
      {
        "idx": 3,
        "id": "ana_trim6",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "ana_trim7",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "ana_trim8",
        "value": "0x00001332"
      },
      {
        "idx": 6,
        "id": "ana_trim9",
        "value": "0x806DC85D"
      },
      {
        "idx": 7,
        "id": "ana_trim10",
        "value": "0xD371013A"
      }
    ],
    [
      {
        "idx": 0,
        "id": "int_algo_1",
        "value": "0x00B1407D"
      },
      {
        "idx": 1,
        "id": "int_algo_2",
        "value": "0x000001A7"
      }
    ],
    [
      {
        "idx": 0,
        "id": "gate_driver_fault_status",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "controller_fault_status",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_status",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "mtr_params",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "algo_status_mpet",
        "value": "0x0A000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "dev_ctrl",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_ctrl1",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "algo_ctrl2",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "current_pi",
        "value": "0x00047661"
      },
      {
        "idx": 3,
        "id": "speed_pi",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "dac_1",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "dac_2",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algorithm_state",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "fg_speed_fdbk",
        "value": "0x7FFFFFFF"
      },
      {
        "idx": 2,
        "id": "bus_current",
        "value": "0x00000000"
      },
      {
        "idx": 3,
        "id": "phase_current_a",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "phase_current_b",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "phase_current_c",
        "value": "0x00000000"
      },
      {
        "idx": 6,
        "id": "csa_gain_feedback",
        "value": "0x00010003"
      },
      {
        "idx": 7,
        "id": "voltage_gain_feedback",
        "value": "0x00000001"
      },
      {
        "idx": 8,
        "id": "vm_voltage",
        "value": "0x01CF8000"
      },
      {
        "idx": 9,
        "id": "phase_voltage_va",
        "value": "0x00000000"
      },
      {
        "idx": 10,
        "id": "phase_voltage_vb",
        "value": "0x00000000"
      },
      {
        "idx": 11,
        "id": "phase_voltage_vc",
        "value": "0x00000000"
      },
      {
        "idx": 12,
        "id": "sin_commutation_angle",
        "value": "0x00000000"
      },
      {
        "idx": 13,
        "id": "cos_commutation_angle",
        "value": "0x00000000"
      },
      {
        "idx": 14,
        "id": "ialpha",
        "value": "0x00000000"
      },
      {
        "idx": 15,
        "id": "ibeta",
        "value": "0x00000000"
      },
      {
        "idx": 16,
        "id": "valpha",
        "value": "0x00000000"
      },
      {
        "idx": 17,
        "id": "vbeta",
        "value": "0x00000000"
      },
      {
        "idx": 18,
        "id": "id",
        "value": "0x00000000"
      },
      {
        "idx": 19,
        "id": "iq",
        "value": "0x00000000"
      },
      {
        "idx": 20,
        "id": "vd",
        "value": "0x00000000"
      },
      {
        "idx": 21,
        "id": "vq",
        "value": "0x00000000"
      },
      {
        "idx": 22,
        "id": "iq_ref_rotor_align",
        "value": "0x00000000"
      },
      {
        "idx": 23,
        "id": "speed_ref_open_loop",
        "value": "0x00000000"
      },
      {
        "idx": 24,
        "id": "iq_ref_open_loop",
        "value": "0x00000000"
      },
      {
        "idx": 25,
        "id": "speed_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 26,
        "id": "id_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 27,
        "id": "iq_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 28,
        "id": "isd_state",
        "value": "0x00000000"
      },
      {
        "idx": 29,
        "id": "isd_speed",
        "value": "0x00000000"
      },
      {
        "idx": 30,
        "id": "ipd_state",
        "value": "0x00000000"
      },
      {
        "idx": 31,
        "id": "ipd_angle",
        "value": "0x00000000"
      },
      {
        "idx": 32,
        "id": "ed",
        "value": "0x00000000"
      },
      {
        "idx": 33,
        "id": "eq",
        "value": "0x00000000"
      },
      {
        "idx": 34,
        "id": "speed_fdbk",
        "value": "0x00000000"
      },
      {
        "idx": 35,
        "id": "theta_est",
        "value": "0x00000000"
      }
    ]
  ]
}

The other file is the state of the registers after a day of waiting after which the Motor sometimes does not start and gives the error: Abnormal BEMF

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{
  "signature": "oneui-register-data",
  "data": [
    [
      {
        "idx": 0,
        "id": "isd_config",
        "value": "0x44638C20"
      },
      {
        "idx": 1,
        "id": "rev_drive_config",
        "value": "0x283AF064"
      },
      {
        "idx": 2,
        "id": "motor_startup1",
        "value": "0x4B68DDC0"
      },
      {
        "idx": 3,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

{
  "signature": "oneui-register-data",
  "data": [
    [
      {
        "idx": 0,
        "id": "isd_config",
        "value": "0x44638C20"
      },
      {
        "idx": 1,
        "id": "rev_drive_config",
        "value": "0x283AF064"
      },
      {
        "idx": 2,
        "id": "motor_startup1",
        "value": "0x4B68DDC0"
      },
      {
        "idx": 3,
        "id": "motor_startup2",
        "value": "0x24AE6000"
      },
      {
        "idx": 4,
        "id": "closed_loop1",
        "value": "0x1A3181B0"
      },
      {
        "idx": 5,
        "id": "closed_loop2",
        "value": "0x1AAD6E3C"
      },
      {
        "idx": 6,
        "id": "closed_loop3",
        "value": "0x0C800002"
      },
      {
        "idx": 7,
        "id": "closed_loop4",
        "value": "0x26898708"
      },
      {
        "idx": 8,
        "id": "speed_profiles1",
        "value": "0x00000000"
      },
      {
        "idx": 9,
        "id": "speed_profiles2",
        "value": "0x00000000"
      },
      {
        "idx": 10,
        "id": "speed_profiles3",
        "value": "0x00000000"
      },
      {
        "idx": 11,
        "id": "speed_profiles4",
        "value": "0x00000000"
      },
      {
        "idx": 12,
        "id": "speed_profiles5",
        "value": "0x00000000"
      },
      {
        "idx": 13,
        "id": "speed_profiles6",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "fault_config1",
        "value": "0x6FE80206"
      },
      {
        "idx": 1,
        "id": "fault_config2",
        "value": "0x74000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "pin_config",
        "value": "0x00000001"
      },
      {
        "idx": 1,
        "id": "device_config1",
        "value": "0x00100000"
      },
      {
        "idx": 2,
        "id": "device_config2",
        "value": "0x0000B000"
      },
      {
        "idx": 3,
        "id": "peri_config1",
        "value": "0x40000000"
      },
      {
        "idx": 4,
        "id": "gd_config1",
        "value": "0x00000100"
      },
      {
        "idx": 5,
        "id": "gd_config2",
        "value": "0x00200000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "ana_trim3",
        "value": "0x48004800"
      },
      {
        "idx": 1,
        "id": "ana_trim4",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "ana_trim5",
        "value": "0x0000000C"
      },
      {
        "idx": 3,
        "id": "ana_trim6",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "ana_trim7",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "ana_trim8",
        "value": "0x00001332"
      },
      {
        "idx": 6,
        "id": "ana_trim9",
        "value": "0x806DC85D"
      },
      {
        "idx": 7,
        "id": "ana_trim10",
        "value": "0xD371013A"
      }
    ],
    [
      {
        "idx": 0,
        "id": "int_algo_1",
        "value": "0x00B1407D"
      },
      {
        "idx": 1,
        "id": "int_algo_2",
        "value": "0x000001A7"
      }
    ],
    [
      {
        "idx": 0,
        "id": "gate_driver_fault_status",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "controller_fault_status",
        "value": "0x80500000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_status",
        "value": "0x002FA0C0"
      },
      {
        "idx": 1,
        "id": "mtr_params",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "algo_status_mpet",
        "value": "0x0A000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "dev_ctrl",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_ctrl1",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "algo_ctrl2",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "current_pi",
        "value": "0x00047661"
      },
      {
        "idx": 3,
        "id": "speed_pi",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "dac_1",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "dac_2",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algorithm_state",
        "value": "0x0030000E"
      },
      {
        "idx": 1,
        "id": "fg_speed_fdbk",
        "value": "0x7FFFFFFF"
      },
      {
        "idx": 2,
        "id": "bus_current",
        "value": "0x00000000"
      },
      {
        "idx": 3,
        "id": "phase_current_a",
        "value": "0xFFC80000"
      },
      {
        "idx": 4,
        "id": "phase_current_b",
        "value": "0x00200000"
      },
      {
        "idx": 5,
        "id": "phase_current_c",
        "value": "0x00100000"
      },
      {
        "idx": 6,
        "id": "csa_gain_feedback",
        "value": "0x00010003"
      },
      {
        "idx": 7,
        "id": "voltage_gain_feedback",
        "value": "0x00000001"
      },
      {
        "idx": 8,
        "id": "vm_voltage",
        "value": "0x01E64000"
      },
      {
        "idx": 9,
        "id": "phase_voltage_va",
        "value": "0x0001BB67"
      },
      {
        "idx": 10,
        "id": "phase_voltage_vb",
        "value": "0x00022A41"
      },
      {
        "idx": 11,
        "id": "phase_voltage_vc",
        "value": "0x00014C8D"
      },
      {
        "idx": 12,
        "id": "sin_commutation_angle",
        "value": "0x007A880C"
      },
      {
        "idx": 13,
        "id": "cos_commutation_angle",
        "value": "0xF8066BF8"
      },
      {
        "idx": 14,
        "id": "ialpha",
        "value": "0xFFD80000"
      },
      {
        "idx": 15,
        "id": "ibeta",
        "value": "0x000DDB3D"
      },
      {
        "idx": 16,
        "id": "valpha",
        "value": "0x0000A572"
      },
      {
        "idx": 17,
        "id": "vbeta",
        "value": "0xFFFFBB1D"
      },
      {
        "idx": 18,
        "id": "id",
        "value": "0x0028B41F"
      },
      {
        "idx": 19,
        "id": "iq",
        "value": "0xFFF4948B"
      },
      {
        "idx": 20,
        "id": "vd",
        "value": "0xFFFF567F"
      },
      {
        "idx": 21,
        "id": "vq",
        "value": "0x00003AEE"
      },
      {
        "idx": 22,
        "id": "iq_ref_rotor_align",
        "value": "0x00000000"
      },
      {
        "idx": 23,
        "id": "speed_ref_open_loop",
        "value": "0x00000863"
      },
      {
        "idx": 24,
        "id": "iq_ref_open_loop",
        "value": "0x00000000"
      },
      {
        "idx": 25,
        "id": "speed_ref_closed_loop",
        "value": "0x0002C36F"
      },
      {
        "idx": 26,
        "id": "id_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 27,
        "id": "iq_ref_closed_loop",
        "value": "0x00002FA0"
      },
      {
        "idx": 28,
        "id": "isd_state",
        "value": "0x00000005"
      },
      {
        "idx": 29,
        "id": "isd_speed",
        "value": "0x0000032B"
      },
      {
        "idx": 30,
        "id": "ipd_state",
        "value": "0x0004000B"
      },
      {
        "idx": 31,
        "id": "ipd_angle",
        "value": "0x03EEBF48"
      },
      {
        "idx": 32,
        "id": "ed",
        "value": "0x00000052"
      },
      {
        "idx": 33,
        "id": "eq",
        "value": "0x00000016"
      },
      {
        "idx": 34,
        "id": "speed_fdbk",
        "value": "0xFFFFF9D9"
      },
      {
        "idx": 35,
        "id": "theta_est",
        "value": "0x00007891"
      }
    ]
  ]
}

I can only imagine it has something to do with the temperature in the components. The remaining conditions were the same.

Maybe you have other ideas.

Best,

Linus

0 Hong Khor over 2 years ago in reply to Linus R.

TI__Intellectual 1240 points

Hi Linus,

Thank you for attaching the state files. I will examine them and aim to get back to you by the end of next week.

Best,

Hong

0 Hong Khor over 2 years ago in reply to Linus R.

TI__Intellectual 1240 points

Hi Linus,

We noticed that your IPD current threshold (IPD_CURR_THR under Motor Startup Stationary in the GUI) and closed-loop current limit (ILIMIT under Closed Loop in the GUI) were set to 6.0A, but your open-loop current limit (OL_ILIMIT under Open Loop in the GUI) was set to 1.5A. This could be restricting the ability of the driver to provide torque, leading to inconsistent startup and motor desyncing causing an Abnormal BEMF Fault. Try setting the open-loop limit to something closer to the closed-loop limit. Additionally, we recommend that you set your IPD current threshold to half the motor's peak rated current (set to 8.0A/2 = 4.0A).

Also, did you obtain the values of R, L, and Ke through MPET? If you are still hitting Abnormal BEMF fault after trying the above, your motor might be small and you might have to manually measure the parameters.

May you provide a capture of the phase current when the motor is starting, speeding up, and in closed-loop (for both successful and unsuccessful tries) if the above doesn't work?

Best,

Hong

0 Linus R. over 2 years ago in reply to Hong Khor

Prodigy 40 points

Hi Hong,
I followed your advice. So far no further problems have occurred if the do again I will get back to you. Thank you very much.

Best,

Linus

0 Hong Khor over 2 years ago in reply to Linus R.

TI__Intellectual 1240 points

Hi Linus,

Thanks for the update. Closing this thread now; feel free to create a new thread for any new questions!

Regards,

Hong

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