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DRV10970: Question about sensorless BLDC

Part Number: DRV10970
Other Parts Discussed in Thread: MCF8329A, MCF8315C

Tool/software:

Hi,

I have a question about sensorless BLDC.

In addition to BEMF, it seems that magnetic linkage can also be used to estimate the rotor position, and do we have products that use the magnetic linkage method? Why we mainly use BEMF for our products?  

Magnetic linkage seems mainly be used in FOC control. As the formula show, Ψsα and Ψsβ are the magnetic linkage of stator, Ψfα and Ψfβ are the magnetic linkage of rotor. This method can estimate the rotor position by calculating Ψfα and Ψfβ. Have you ever heard it before? I know it by accident and want to know the application of it. 

 

Regard,

Eric Li