S32KのトピックRe: BLDC with encoder for s32k144 example

BLDC with encoder for s32k144 example

Abdel — Wed, 02 Dec 2020 22:28:55 GMT

Hello, can you help me to find a possibility to switch between encoder and Hall sensor in the BLDC Motor Application Tuning Tool as with pmsm control page (see picture below). Thank you in Advance

Best regards

Abdel

Re: BLDC with encoder for s32k144 example

marekmusak — Thu, 03 Dec 2020 09:56:21 GMT

Hello Abdel,

compared to PMSM app, in the BLDC app, there is a macro that defines Hall operation or sensorless operation . This macro can be changed in motor_structure.h as show below:

/*****************************************************************************
* Define Hall based or Sensorless based BLDC SixStep Control
*
* HALL_SENSOR 0 Sensorless operation, motor position/speed obtained by the back-EMF voltage
* zero-cross detection method
* HALL_SENSOR 1 Sensorbased operation, motor position/speed is obtained by the Hall sensor
*
******************************************************************************/
#define HALL_SENSOR 0

Re: BLDC with encoder for s32k144 example

Abdel — Thu, 03 Dec 2020 10:59:14 GMT

Hi Marekmusak,

Thank you for your answer. Of course I changed the motor_structure.h for the hall sensor, otherwise I would not have seen the signals in freemaster. I meant a checkbox where you could decide between a hall sensor or an encoder in page control from motor control app tuning tool. Can you tell me please, if the bldc motor has also an encoder or just a hall sensor?

Best regards

Abdel

Re: BLDC with encoder for s32k144 example

marekmusak — Thu, 03 Dec 2020 12:21:50 GMT

Hello Abdel,

Unfortunately, such a check box does not exist in BLDC app. BLDC motor is trapezoidal motor type controlled by Six-step commutation technique, so here we use Hall sensor that perfectly fit to this commutation technique. Encoder is more expensive sensor intended for sinusoidal control -FOC. This motor control kit offers only Hall sensor, nevertheless, you can use your own motor with encoder and run PMSM_FOC code example. This code example contains routine for encoder signal processing.