How to drive a motor with both encoder and hall?

[Junde]

Hi there,

I have a motor support both encoder signals(ABZ) and hall signals(ABC) output.

But I checked the DEV Kit and the examples of MCSDK6. Most examples use only one of the position feedback sensors.

And for the MCSDK6 project, I can only configure the encoder and hall signal as a timer input. However, I DIY board can only support TIMER for the encoder and GPIO for the hall.

I am asking for help on how to configure the project so that I can use both the encoder and the hall sensor in the motor with my DIY board.

(I found a document named "Generation and use of Hall correspondence Table.pdf" by ST in Chinese. But I can't understand some details in this file. Is there anything more that can help me to understand this?)

Thank you for your help!

[STuser2]

Both encoder and hall sensor will do the same purpose of giving the rotor position, encoder being more accurate compared to hall, what is the main purpose of using both?   

[Junde]

@STuser2 

Thanks for your reply.

I also have some questions about that; however, the motor and the schematic are designed as that.

And according to the attachments I uploaded, it seems both position sensors were required sometimes.

And I asked the AI, it replied as below:

1. Enhanced Startup Reliability: Hall sensors provide definitive initial rotor position (sector), ensuring robust and reliable startup, especially under high inertia or significant static friction loads, where sensorless or open-loop methods might fail.

2. Redundancy & Fault Tolerance: In safety-critical applications, Hall sensors serve as a simple, reliable backup. If the high-resolution encoder fails, the system can degrade to a basic Hall-sensor-based commutation mode to maintain essential operation.

3. Avoiding Startup Movement: For systems using incremental encoders, a homing sequence (requiring motor movement) is needed to establish position after power-up. Hall sensors provide immediate absolute sector information at a standstill, eliminating any unwanted initial movement.

[STuser2 · Accepted solution]

The above is from the MCSDK documentation, see if it is useful, the above information is in the section 

[Junde]

@STuser2 

Thanks for your patient help.

According to the document you referenced above, it seems the MCSDK project doesn't support both encoder and hall now.