Patent ID: 9291169
Filing Date: 2016-03-22
CPC Classification: F04D,H02P,Y02B

Claim Text:
1. A fan motor control device for use with a fan motor, comprising: a zero-crossing detection unit being supplied with electric power and receiving a square wave signal from an electric power output unit which the zero-crossing detection unit detects zero-crossings of voltage of the electric power supplied from the electric power output unit and that generates a synchronization reference signal; a phase control unit being electrically connected to the zero-crossing detection unit for receiving the synchronization reference signal, and generating a phase control signal according to the synchronization reference signal for controlling the fan motor's output power and rotational speed; an operation processing unit being electrically connected to the phase control unit and generating a processing signal according to the phase control signal; a first rectifier element being electrically connected to the operation processing unit and generating a first phase signal according to the processing signal for sending to a first coil unit; a second rectifier element being electrically connected to the operation processing unit and generating a second phase signal according to the processing signal for sending to a second coil unit; whereby the fan motor is driven to rotate according to one of the first phase signal and the second phase signal; and wherein the phase control unit applies the received synchronization reference signal to an AC sine wave and changes a turn-on angle of the AC sine wave according to the synchronization reference signal, so as to control a voltage magnitude of the supplied electric power and generate the phase control signal for controlling the fan motor's output power and rotational speed.