What is the difference between BLDC and PMSM motors?

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The BLDC controller is more simple and its power circuit has 3 switches for 3 phase motor and a PMSM driver has more complicated driving strategy, with its power circuit having 6 switches. To prevent hunting in PMSM, we must never hard-accelerate the frequency of supply, which does not exist in case of BLDC motor.

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Author: https://www.quora.com/What-is-the-difference-between-BLDC-and-PMSM-motors