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problem in receiving speed to speed.ref

msadegh agha
Expert 1830 points

Other Parts Discussed in Thread: MOTORWARE

hi,

i designed a inverter by F28027 MCU based on TI_hvkit_rev1p1. also i am using a motorware_1_01_00_16 and CCS6.1.

i have a problem in using this inverter in full load.

the inverter works fine in speeds below the 500rpm. when i set a speed.ref to 600rpm, the speed stop in about 530rpm and doesn't go above this speed. in this state the parameter USER_MOTOR_MAX_CURRENT was 5.0.

i increase the USER_MOTOR_MAX_CURRENT to 6.0, the speed goes to 560 and stops. when i increase the USER_MOTOR_MAX_CURRENT to 6.5 or above, the motor make a bad noise while spinnig. 

the question is, how can i reach to speed.ref above the 560rpm?

what parameter can i change to reach to speed.ref?

is the noise because of the bad motor design or wrong parameter?

thanks.

  • 0
    TI__Guru** 119680 points
    what is the maximum rated speed of the motor?
    which type of motor, induction or synchronous?

    have you tried proj_lab10 for increasing modulation?
    have you tried proj_lab09 for using field weakening (increased speed but reduced torque)?
  • 0 in reply to ChrisClearman
    Expert 1830 points

    hi,

    1- i changed the maximum speed between 5.0 and 8.0, when this value set above the 6.5, the motor can't start normally and make noise.

    2- my motor is synchronous

    3- i used proj_lab10

    4- i used proj_lab09 but nothing useful happened.

    how can i fix this problem?

  • 0 in reply to msadegh agha
    TI__Guru** 119680 points
    are you sure the motor can run as fast as you think it can?
    assuming
    1. the motor can reach 600 RPM with this load
    2. you are using over modulation in lab10 properly
    3. you have a large enough USER_MOTOR_MAX_CURRENT

    the only thing else would be that the parameters are incorrect, specifically the inductance.
  • 0 in reply to ChrisClearman
    Expert 1830 points
    the motor can run in that speed but not in full load. when i decrease the load, it can run in upper speed but in full load it can't go upper than 530 rpm.
    i increase the USER_MOTOR_MAX_CURRENT to 6.0, the speed goes to 560 and stops. when i increase the USER_MOTOR_MAX_CURRENT to 6.5 or above, the motor make a bad noise while spinnig.
    i think the parameter is correct. because everything is good in lower speed .
  • 0 in reply to msadegh agha
    TI__Guru** 119680 points
    msadegh,
    but are you sure your motor is actually rated to run 600 RPM at full load?

    what is the USER_ADC_CURRENT_A designed for this board?