Sensor switch in motor control with FOC algorithm

[Diego3]

I am using the EVLSPIN32G0B1 demo board and the MC Workbench v6.4.1 software, and I would like to use the FOC control algorithm.

More specifically, I would like to use the Hall sensors when the motor starts and operates at low speeds, and then switch to sensorless control at higher speeds.

I have read that the library does not support automatic switching, so I will need to implement it manually in the code.

How should I proceed?

Thank you for your support.

[GMA]

Hello @Diego3,

User-accessible APIs are defined in the mc_api.c file:

• MC_GetAverageMecSpeedMotor1_F() returns the last computed average mechanical rotor speed in rpm.
• MC_SensorSwitchMotor1() is used to switch between the primary and the auxiliary sensor.

[Diego3]

Thank you for your reply.
How should I use the MC_SensorSwitchMotor1 function?
If I later want to switch back to the Hall sensors, how should I do it? Can I use the MCI_SensorSet function? However, I wouldn’t know how to use it…
Also, how can I check that the PLL is locked before performing the switch?

 

Thank you for your support.

[GMA]

Hello @Diego3,

An example that uses MC_SensorSetMotor1() is provided in the "Auxiliary speed sensor usage" chapter of the "User Manual" available through "Workbench tool">About>Documentations>Documentation.

Starting with PLL you can use MC_GetSTMStateMotor1() API to wait for the RUN state.