S32K中的主题 Re: Estimated RPM and speed in MCSPTE1AK144 FOC PMSM application

Estimated RPM and speed in MCSPTE1AK144 FOC PMSM application

RajG — Tue, 01 Jun 2021 14:28:31 GMT

Hello to all, I wanted to send the current RPM and speed of the motor in MCSPTE1AK144 kit via UART to console for my application.

From the code provide of 2 resistor sense PMSM FOC based software, I am writing value to "drvFOC.pospeControl.wRotElReq" structure for rotation of motor. Here wRotElReq is the required speed variable, so we can change it to get specific rpm.

I would like to know the calculated/ estimated speed and RPM of the motor so i can transmit it via UART and have a feedback value about the rotation. I kindly request to help me with some variable or structure which i dont know in this code that can directly give such estimated RPM and speed.

Thanks and Regards,

RajG.

Re: Estimated RPM and speed in MCSPTE1AK144 FOC PMSM application

RajG — Sat, 05 Jun 2021 10:18:54 GMT

@PetrS @marekmusak @mariuslucianand
stuck since many days and no one replied to my query, so tagging you all sir,

Thanks and Regards,
RajG.

Re: Estimated RPM and speed in MCSPTE1AK144 FOC PMSM application

marekmusak — Thu, 17 Jun 2021 10:42:25 GMT

Hello RajG,

To get actual rotor speed, use variable drvFOC.pospeControl.wRotEl which is an electrical speed in format rad/s.

To get speed in rpm format, it must be multiplied by (60/2*pi*pp), where pp is number of pope pairs. Motor of this kit has two pole pairs, thus pp=2.

FreeMASTER variable "Speed FOC loop" has the same RPM format.

Regards,

Marek