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BOOSTXL-DRV8323RS: Problem identifying using BOOSTXL-DRV8323RS board and the LaunchXL-F28027F

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Part Number:BOOSTXL-DRV8323RS

I am trying to identify a small 8 pole motor and the Ls estimation seems to be very low.

I am using the software provided in motorware for the DRV8323 and the only changes to the USER.H is I increase the PWM freq and the PWM ticks as below.

#define USER_PWM_FREQ_kHz (60.0)

#define USER_NUM_PWM_TICKS_PER_ISR_TICK (3)

I also soldered the 0.1uF capacitor onto location C9, C10, and C11 on the DRV8323 board.

Below are the estimated values and motor settings during identification.

#elif (USER_MOTOR == My_Motor)

#define USER_MOTOR_TYPE MOTOR_Type_Pm

#define USER_MOTOR_NUM_POLE_PAIRS (4)

#define USER_MOTOR_Rr (NULL)

#define USER_MOTOR_Rs (0.0433574989)

#define USER_MOTOR_Ls_d (4.10688497e-12)

#define USER_MOTOR_Ls_q (4.10688497e-12)

#define USER_MOTOR_RATED_FLUX (0.0112582613)

#define USER_MOTOR_MAGNETIZING_CURRENT (NULL)

#define USER_MOTOR_RES_EST_CURRENT (3.0)

#define USER_MOTOR_IND_EST_CURRENT (-1.5)

#define USER_MOTOR_MAX_CURRENT (20.0)

#define USER_MOTOR_FLUX_EST_FREQ_Hz (40.0)

 

I measure 140 uH at 1kHz with my LCR meter between two phases of my motor.

I measure 0.3 ohms between two phases with a ohm meter.

Just wondering if the BOOSTXL-DRV8323RS needs any other changes to work in my application or if anyone else has had issues with this board.


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