The brushless DC motor needs a position sensor to measure the position of the rotor. The motor controller receives the position sensor signal to synchronize the inverter with the rotor to drive the motor to run continuously. Although the brushless DC motor can also detect the position of the rotor through the reverse induced electromotive force generated by the stator winding, without the position sensor, the speed is too low when the motor starts, and the reverse induced electromotive force signal is too small to be detected, which brings great inconvenience to the users of electric bicycles.
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