Patent ID: 9276514
Filing Date: 2016-03-01
CPC Classification: H02P

Claim Text:
1. A fan motor, comprising: a) a variable speed motor; and b) a motor controller, the motor controller comprising: a microprocessor, an inverter unit, a voltage detection unit, a plurality of power input lines, and a power supply unit; wherein: the power supply unit supplies power for the microprocessor, the inverter unit, and the voltage detection unit; the voltage detection unit is connected with the plurality of power input lines; and each power input line is adapted to receive AC power from an AC power supply; the voltage detection unit comprises: a plurality of voltage detection circuits, and a plurality of thermal resistors; every power input line is connected to one of the plurality of thermal resistors in series; each voltage detection circuit comprises a thermo-sensitive resistor; and the thermo-sensitive resistor is bound to the corresponding thermal resistor via a thermally-conductive and electrically-insulating element; the thermo-sensitive resistor is not electrically connected to the thermal resistor; the thermo-sensitive resistor is adapted to change a resistance value of the thermo-sensitive resistor and a voltage of an output end of the voltage detection circuit in response to a temperature signal of the thermal resistor; output ends of the plurality of the voltage detection circuits are connected to an input end of the microprocessor; and the microprocessor determines a power-on state of each power input line according to the output end voltage of each voltage detection circuit.