TMS320F28054M: How to ajust the holding current after Rs calibration?

Qiang Guo

Part Number: TMS320F28054M

HI TI,

I am running SPINTAC lab 13c, after Rs-recalbration, motor is at online state and holding still. And it's pumping some small current to the motor to hold its position.

how can I adjust how much current it needs to hold its position without losing control? Is there any parameters I can change to adjust its holding current?

over 6 years ago

0 Yanming Luo over 6 years ago

TI__Guru** 115480 points

The USER_MOTOR_RES_EST_CURRENT is used for both Rs-recalbration and rotor locking. The USER_MOTOR_RES_EST_CURRENT depends on the motor specification and load, you may set it to 10%~30% of the rated current of the motor.

0 Qiang Guo over 6 years ago in reply to Yanming Luo

Expert 1695 points

I set the USER_MOTOR_RES_EST_CURRENT down to 0.3A, and did few tests. I pushed against the motor, the locking current gMotorVars.Is_A still go above 1A not limiting to 0.3A. Why?

0 Yanming Luo over 6 years ago in reply to Qiang Guo

TI__Guru** 115480 points

As replied to you in another thread, the USER_MOTOR_RES_EST_CURRENT is set to reference Id, not total current (Is) of the motor, you might check if the Iq is not equal to Zero since the motor is adding a load and try to keep the stalled status with Zero speed

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TMS320F28054M: How to ajust the holding current after Rs calibration?