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DRV8301 EVM with low current motor

Fahad Raza
Prodigy 110 points

Other Parts Discussed in Thread: DRV8301-69M-KIT, BOOSTXL-DRV8301, DRV8301, MOTORWARE

Hey Chris,

           I am a new user to the DRV8301-69M-KIT. I seem to be facing some problems while using the InstaSPIN-FOC GUI. I purchased an AC SERVO Motor from Panasonic to implement FOC for my research. The problem that I am facing is that every time I try to start the automatic identification algorithm on the InstaSPIN-FOC, the stator inductance value turn out to be very abnormal like (5e-10 H) both for d and q axis.

I am using a 24 volts power supply.I used the default identification parameters after which I tried to manipulate the Res Current and the Ind Current to 20% of the rated value, even then the inductance value was negligible. Is there something I am doing wrong here?

Following are my motor parameters.

3 phase AC 43V @ 50W. Rated frequency is 200 Hz. Rated Speed is 3000rev/min. Rated/Max Current: 1.1A/4.7A

Motor Pole pairs = 4 

  • 0
    TI__Guru** 119680 points

    Hello, Fahad

    some comments for you

    1. The EVM you purchased is scaled for 66V and +/-40A.  You are using a motor at 24V (rated for 43V?) that pulls <1.1A under full load.  This is not a good match for your motor. You should have considered the DRV8312-69M-KIT (15-60V, 3.5A cont) or the BOOSTXL-DRV8301 (6-24V/10A cont).  Resolution of the signals is critical to sensorless high performance motor control

    2. The GUI you are using is "frozen", meaning it doesn't have any of the updates we've made to MotorWare in the last 2 years, including special motor ID for low inductance / high speed motors (which yours most likely is).  It also doesn't allow you to change the PWM frequency (which you will need to do) nor the IQ_ scaling variable for voltage (which you will need to do).  At a minimum, try using MotorWare and running proj_lab02c to see if you can ID the motor with DRV8301 EVM.  You may be able to, but I think the current resolution is still too small.  The Ls of your motor will be in the 5-50uH range most likely.