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Instaspin cannot reach max RPM

Romke
Prodigy 250 points


I'm using the Launchpad XL (TMS230F28069M) with the BOOST-XL-DRV8301 REV B Motor Drive BoosterPack.

The PSU that i'm using for this board is 24 VDC.

The motor is a BLDC motor with a 15:1 gearbox attached to it.

When i'm using a different BLDC motorcontroller i can get the speed up to around 2700 RPM with a PSU of 24V.

With InstaSPIN i can only get it to around 1300 RPM, i expected it to be about the same as the other controller.

I've attached my user.h and user_j1.h.

0652.user.h

8686.user_j1.h

How can i reach around 2500 RPM like with the other controller?

  • 0
    TI__Guru** 119670 points
    1. how do you know USER_MOTOR_NUM_POLE_PAIRS (2) is correct?
    2. your identified inductance looks lower than the nameplate. I would try to ID this motor again to see if your results differ. Increase
    USER_MOTOR_FLUX_EST_FREQ_Hz (40.0)

    make sure that the motor starts and remains spinning during the ID process. If it doesn't start-up increase
    USER_MOTOR_RES_EST_CURRENT (1.0)

    do remember that in most of the labs you limit your max speed due to a limit of sinewave generation. if you want to increase the PWM modulation use lab10 to get another 25% increase in speed. Your speed is so far off though that I suspect something else is the main culprit.

    once you get this solved you will need to increase this to insure you can generate peak current commands
    #define USER_MOTOR_MAX_CURRENT (16.0)
  • 0 in reply to ChrisClearman
    Prodigy 250 points

    1. I asked the manufacturer about the number of poles and they said it was 4. There is also an encoder connected to the shaft which i used to verify the speed. And the gMotorVars.Speed_krpm is about the same as what the encoder tells me. (i connected the encoder to the other controller to view it).

    2. I forgot to tell that i also had problems with measuring the ID of the motor. Especially USER_MOTOR_Ls_d and USER_MOTOR_Ls_q.

    I also found the problem:

    - The build was set to Flash, when i've set it to Release i got to around 2700 RPM like with the other controller. Also the ID was measured good now.

    I ended up with the following settings:

    #define USER_MOTOR_TYPE                 MOTOR_Type_Pm
    #define USER_MOTOR_NUM_POLE_PAIRS       (2)
    #define USER_MOTOR_Rr                   (NULL)
    #define USER_MOTOR_Rs                   (0.4164607)
    #define USER_MOTOR_Ls_d                 (0.001235268)
    #define USER_MOTOR_Ls_q                 (0.001235268)
    #define USER_MOTOR_RATED_FLUX           (0.1555079)
    #define USER_MOTOR_MAGNETIZING_CURRENT  (NULL)
    #define USER_MOTOR_RES_EST_CURRENT      (1.0)
    #define USER_MOTOR_IND_EST_CURRENT      (-1.0)
    #define USER_MOTOR_MAX_CURRENT          (5.1)
    #define USER_MOTOR_FLUX_EST_FREQ_Hz     (15.0)
    #define USER_MOTOR_ENCODER_LINES        (1.0)
    #define USER_MOTOR_MAX_SPEED_KRPM       (2.7)
    #define USER_SYSTEM_INERTIA             (0.02)
    #define USER_SYSTEM_FRICTION            (0.01)

  • 0 in reply to Romke
    TI__Guru** 119670 points
    glad it is now working, but strange that the Flash release would have an issue....