TMS320F280049C-Q1: TMS320F280049C-Q1 maximum PWM frequency of motor control

user6346729

MCU with instaspin FOC function, which product is more suitable for sensorless control of high-speed motor, and the motor frequency can reach 2.3khz.

What is the maximum PWM frequency of this product for sensorless control of motor.

over 4 years ago

+1 Yanming Luo over 4 years ago

TI__Guru** 116930 points

The control ISR and estimator frequency must be less than 25kHz to insure ISR completes and leaves time for background tasks. The PWM can be set to 1~15 times of the control ISR frequency, but the number is recommended to be less than 4 to improve the current control response, so the maximum PWM frequency is better to be less than 100kHz, it is also dependent on the FET and gate driver of the inverter.

0 user6346729 over 4 years ago

Prodigy 160 points

谢谢！

0 user6346729 over 4 years ago

Prodigy 160 points

Thank you. In addition, the problem of over-current in the process of parameter identification was solved by increasing the PWM frequency. However, when the PWM frequency of 28069f reaches 19K, the interrupt load rate has reached 95%. Thank you again!

+1 ChrisClearman over 4 years ago in reply to user6346729

TI__Guru** 119680 points

you have to change the ISR_TICK so that the control loop runs at a slower rate than the PWM. For example run the PWM at 45 KHz for a low inductance motor, use an ISR_TICK of (3) for the current controller to run at 15 KHz

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TMS320F280049C-Q1: TMS320F280049C-Q1 maximum PWM frequency of motor control