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DRV10983 startup problem

Jason Change
Intellectual 370 points
Other Parts Discussed in Thread: DRV10983

Dear Sir,

I have one BLDC motor (Maxon EC motor 30W 404080).

This motor run few seconds and then stop when spin in open loop.

I have two questions.

1. Why motor stop during startup?

2. Does DRV10983 support maxon EC motor?

Maxon EC motor 30W 404080 motor parameter as below:

1. Nominal voltage: 24V

2. No load speed: 40700 rpm

3. No load current: 155mA

4. Nominal speed: 36300 rpm

5. Nominal current (max. continuous current): 1.7A

6. 1 pole pairs

7. 3 phase

8 Inductance phase to phase: 114uH

9. Resistance phase to phase: 1.53 Ohm

DRV10983 GUI setting for MAXON EC motor.docx

  • 0
    TI__Guru** 114905 points
    Hi Jason,

    Our experts have been notified and should reply soon.
  • 0 in reply to Rick Duncan
    TI__Expert 3010 points

    Hi Jason,

    Can you share waveform of phase current during open loop 

    Couple of recommendation on setting

    - Decrease open to close threshold

    - Since this motor is intended to spin at high speed, higher PWM frequency is desired. On Advanced setting page check box for  'Double the output PWM frequency'

    Let me know how it goes

    Regards,

    Krushal 

  • 0 in reply to Krushal
    Intellectual 370 points

    Hi Krushal,

    Thanks for your feedback.

    I reduce open to close threshold motor can startup.

    One thing i didn't understand, we follow turning guide to set threshold.

    Why can not start up smoothly?

    There are some phase current waveform for you reference.

    1. Open to close threshold is 204Hz.

    2. Open to closed threshold is 51Hz

    Zoom in 

    3. Maximum speed (41000RPM)

  • 0 in reply to Jason Change
    TI__Expert 3010 points
    HiJason,

    The device is hitting over current limit in open loop if the threshold is too high. Can you try reducing the open loop current and check whether you can get higher threshold.

    Tuning guide provides guidance to tune motor but parameters needs to be optimized for every motor and applications.

    Did you try increasing PWM frequency ?

    Regards,
    Krushal
  • 0 in reply to Krushal
    Intellectual 370 points

    Hi Krushal,

    I not sure your "reducing the open loop current" means change open loop current value on startup setting.

    If so, right now my setting is 0.4A and enable double output PWM frequency.

    I found if KT value setting higher will get high open loop current.

    There are some setting and waveform for you reference.

    Based on experiment, may i know high threshold or low threshold have any difference for motor performance?

    Do you have any comment for threshold setting?

     

    1. Open to closed threshold higher 179.2Hz motor will stop. Setting 166.4Hz motor can startup, but phase current still high.

    2. If kt is lower 29.3mV/HZ the open to closed loop threshold can set to 204.8Hz, but open loop current must be set 0.4A for lower phase current. 

    3. kt: 29.3, threshold: 204.8Hz, open loop current 0.2A. Motor will stop during startup.

    Best regards,

    Jason