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Which of the following are the types of BLDC motor?

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Which of the following are the types of BLDC motor?

(a) Unipolar, Bipolar

(b) Unipolar, PWM

(c) Bipolar, PWM

(d) Synchronous, Induction

I have been asked this question in examination.

My question is from Solid State Controlled Drives topic in chapter Introduction to Solid State Controlled Drives of Electric Drives

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The correct answer is (a) Unipolar, Bipolar

Easiest explanation: Unipolar and Bipolar are the types of BLDC motor. They use the Hall effect rotor position sensor and optical rotor position sensor.

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