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TMS320F28069F: Motor torque output is weak at 300rpm

F.F
Genius 3095 points
Part Number: TMS320F28069F
Other Parts Discussed in Thread: DRV8301, MOTORWARE

Dear team:

TI device: DRV8301-HC-EVM Rev D.

Routine: \...\sw\solutions\instaspin_foc\boards\drv8301kit_revD\f28x\f2806xF\projects\ccs5\proj_lab10a

The torque of EVM can reach 50H. Cm in normal test, But in the process of actual use, the user thinks that the torque of our product is too small. When the load is mutated (largen), The stability of this kit will be insufficient, and the actual output will be less than 50n.cm of torque, About 10 h.cm smaller. (Compare with a product in Germany which is the same as ours.)

Ask TI's engineers to provide solutions of weak and soft torque output at 300rpm of the motor. Thank you very much.

Best regards

  • 0
    TI__Intellectual 2875 points

    DRV8301 EVM was designed just for evaluation, not for optimized best performance. Though the rated speed was not opened here, 300 rpm is a very challenge speed range for full torque output with sensorless control. For optimized operation at low speed, PCB board also have to be optimized. Especially, the resolution of feedback signals like currents and voltages should be optimized for better performance at low speed.

    One another option is a F280049C instead of F28069F. The rom code in F280049C was made by floating-point instead of fixed-point, and has more advanced feature in low speed. So low speed performance is better than F28069F in my experience.
    Unfortunately, the first version of MotorSDK (v1.0) doesn't include DRV8301 EVM. But if you are familiar with MotorWare and InstaSPIN-FOC solution, I think you can build up some codes like HAL for DRV8301 by yourself.