MCT8329EVM: Control loop response

Hi Rahul,

1. Can you provide the register configuration you are using for the MCT8329?
2. Can you provide me the motor you are using or its datasheet? 
3. What is your target response time?

Regards,

Joshua

Hello Joshua, 

1. Register Settings are added as code, couldn't attach the file. 

2. I don't have the motor datasheet. Measured motor parameters are: Rs: 0.16Ohms, Ls: 8.9uH, Rated flux: 0.00144V/Hz

3. Currently Motor max speed is set at 1750hz. When Going from 48% to 51% speed input command, the time taken is roughly 500ms. I would like it to be around 100ms. 

{
  "signature": "oneui-register-data",
  "data": [
    [
      {
        "idx": 0,
        "id": "isd_config",
        "value": "0x7EC04D02"
      },
      {
        "idx": 1,
        "id": "motor_startup1",
        "value": "0x4806C577"
      },
      {
        "idx": 2,
        "id": "motor_startup2",
        "value": "0x33653815"
      },
      {
        "idx": 3,
        "id": "closed_loop1",
        "value": "0x1F7F4C00"
      },
      {
        "idx": 4,
        "id": "closed_loop2",
        "value": "0x23A1A498"
      },
      {
        "idx": 5,
        "id": "closed_loop3",
        "value": "0x34C92001"
      },
      {
        "idx": 6,
        "id": "closed_loop4",
        "value": "0x001AC953"
      },
      {
        "idx": 7,
        "id": "const_speed",
        "value": "0x30010001"
      },
      {
        "idx": 8,
        "id": "const_pwr",
        "value": "0x36B00640"
      },
      {
        "idx": 9,
        "id": "150_deg_two_ph_profile",
        "value": "0x24DB7200"
      },
      {
        "idx": 10,
        "id": "150_deg_three_ph_profile",
        "value": "0x48DB6946"
      },
      {
        "idx": 11,
        "id": "ref_profiles1",
        "value": "0x032184A6"
      },
      {
        "idx": 12,
        "id": "ref_profiles2",
        "value": "0x34C80AFC"
      },
      {
        "idx": 13,
        "id": "ref_profiles3",
        "value": "0x4787D70C"
      },
      {
        "idx": 14,
        "id": "ref_profiles4",
        "value": "0x000C9932"
      },
      {
        "idx": 15,
        "id": "ref_profiles5",
        "value": "0x1F6BF200"
      },
      {
        "idx": 16,
        "id": "ref_profiles6",
        "value": "0x00708000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_ctrl1",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "device_ctrl",
        "value": "0x00008000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "ana_trim3",
        "value": "0x48004800"
      },
      {
        "idx": 1,
        "id": "ana_trim4",
        "value": "0x4800000000"
      },
      {
        "idx": 2,
        "id": "ana_trim5",
        "value": "0x00000048"
      },
      {
        "idx": 3,
        "id": "ana_trim6",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "ana_trim7",
        "value": "0x00F5A964"
      },
      {
        "idx": 5,
        "id": "ana_trim8",
        "value": "0x00005E84"
      },
      {
        "idx": 6,
        "id": "ana_trim9",
        "value": "0x00A9C81F"
      },
      {
        "idx": 7,
        "id": "ana_trim10",
        "value": "0x53720F3C"
      }
    ],
    [
      {
        "idx": 0,
        "id": "fault_config1",
        "value": "0x71783604"
      },
      {
        "idx": 1,
        "id": "fault_config2",
        "value": "0x7A85C00A"
      }
    ],
    [
      {
        "idx": 0,
        "id": "gate_driver_fault_status",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "controller_fault_status",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "gd_config1",
        "value": "0x000600FC"
      },
      {
        "idx": 1,
        "id": "gd_config2",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "pin_config1",
        "value": "0x20600004"
      },
      {
        "idx": 1,
        "id": "pin_config2",
        "value": "0x3E0020AA"
      },
      {
        "idx": 2,
        "id": "device_config",
        "value": "0x27104005"
      }
    ],
    [
      {
        "idx": 0,
        "id": "sys_status1",
        "value": "0x00520000"
      },
      {
        "idx": 1,
        "id": "sys_status2",
        "value": "0x60010000"
      },
      {
        "idx": 2,
        "id": "sys_status3",
        "value": "0x00000000"
      }
    ]
  ]
}

Thanks. 

Hi Rahul,

I will need some time to look into this issue. I will aim to get back to you by the end of next week.

Regards,

Joshua

Hello Joshua, 

A gentle reminder and also to keep this thread alive. 

Thanks. 

Hi Rahul,

We recommend further adjusting the Kp and Ki values, setting these to the highest values does not guarantee the fastest acceleration/response time. Tuning the Kp and Ki values is experimental and may take trying many different values until the desired results are achieved.

Regards,

Joshua 

Hello Joshua, 

I have checked the entire range of gain values. No matter which value I keep, the response is same. I almost feel like the gain coefficients are not being written. 

Based on my experience with MCT8316A, it was pretty easy to tune. 

Thanks.