Motor component and integrated circuit for driving motor

Abstract

A motor component and an integrated circuit for driving a motor are provided. The integrated circuit includes a housing, pins extended out from the housing, and a switch control circuit disposed on a semiconductor substrate. The semiconductor substrate and the switch control circuit are packaged in the housing. The switch control circuit is configured to generate a control signal for controlling a bidirectional AC switch to be switched on or switched off, based on a magnetic field polarity of a rotor of the motor, to control an energized mode for the motor.

1 . A motor component, comprising: a motor and a driving circuit for the motor which is powered by an alternating current (AC) power supply, wherein the motor comprises a stator and a rotor rotatable relative to the stator, the stator comprises a stator core and a stator winding wound on the stator core; the driving circuit comprises an integrated circuit and a controllable bidirectional AC switch connected to the integrated circuit, the controllable bidirectional AC switch and the stator winding are connected in series between two terminals configured to connect to the AC power supply, at least two of a rectifier, a detecting circuit and a switch control circuit are integrated into the integrated circuit, the rectifier is configured to generate a direct current (DC) voltage at least supplied to the detecting circuit, the detecting circuit is configured to detect a magnetic field polarity of the rotor, and the switch control circuit is configured to control the controllable bidirectional AC switch to be switched between a switch-on state and a switch-off state in a preset way, based on a polarity of the AC power supply and the magnetic field polarity of the rotor detected by the detecting circuit. 
     
     
         2 . The motor component according to  claim 1 , wherein the switch control circuit is configured to switch on the controllable bidirectional AC switch in a case that the AC power supply is in a positive half cycle and it is detected by the detecting circuit that the magnetic field polarity of the rotor is a first polarity, or in a case that the AC power supply is in a negative half cycle and it is detected by the detecting circuit that the magnetic field polarity of the rotor is a second polarity opposite to the first polarity. 
     
     
         3 . The motor component according to  claim 1 , wherein the driving circuit further comprises a voltage dropper connected to the rectifier. 
     
     
         4 . The motor component according to  claim 1 , wherein the rectifier and the voltage dropper are connected across two nodes to form a branch, and the controllable bidirectional AC switch is connected in parallel with the branch. 
     
     
         5 . The motor component according to  claim 3 , wherein the driving circuit further comprises a voltage stabilizer configured to stabilize the DC voltage, and the rectifier, the voltage dropper, the voltage stabilizer, the detecting circuit and the switch control circuit are integrated into the integrated circuit. 
     
     
         6 . The motor component according to  claim 3 , wherein the rectifier is integrated into the integrated circuit, and the voltage dropper is disposed outside the integrated circuit. 
     
     
         7 . The motor component according to  claim 6 , wherein a voltage stabilizer configured to stabilize the DC voltage is further integrated into the integrated circuit. 
     
     
         8 . The motor component according to  claim 1 , wherein the detecting circuit comprises a magnetic sensor, the integrated circuit is installed near the rotor and the magnetic sensor is capable of sensing the magnetic field polarity of the rotor and variation of the magnetic field polarity. 
     
     
         9 . The motor component according to  claim 1 , wherein the detecting circuit does not comprise a magnetic sensor. 
     
     
         10 . The motor component according to  claim 1 , wherein the driving circuit does not comprise a microprocessor. 
     
     
         11 . The motor component according to  claim 1 , wherein the motor component does not comprise a printed circuit board (PCB). 
     
     
         12 . The motor component according to  claim 1 , wherein the motor is a single-phase permanent magnetic synchronous motor, the rotor comprises at least one permanent magnet, a non-uniform magnetic circuit is formed between the stator and the permanent magnetic rotor, and a polar axis of the permanent magnetic rotor has an angular offset relative to a central axis of the stator in a case that the permanent magnetic rotor is at rest, the rotor operates at a constant rotational speed of 60 f/p rpm during a steady state phase after the stator winding is energized, where f is a frequency of the AC power supply and p is the number of pole pairs of the rotor. 
     
     
         13 . An integrated circuit for driving a motor, comprising: a housing, pins extended out from the housing, and a switch control circuit disposed on a semiconductor substrate, wherein the semiconductor substrate and the switch control circuit are packaged in the housing, the switch control circuit is configured to generate a control signal for controlling a bidirectional AC switch to be switched on or switched off, based on a magnetic field polarity of a rotor of the motor, to control an energized mode for the motor. 
     
     
         14 . The integrated circuit according to  claim 13 , wherein a detecting circuit configured to detect the magnetic field polarity of the rotor of the motor is further integrated into the semiconductor substrate. 
     
     
         15 . The integrated circuit according to  claim 14 , wherein a rectifier configured to generate a DC voltage at least supplied to the detecting circuit is further integrated into the semiconductor substrate. 
     
     
         16 . The integrated circuit according to  claim 13 , wherein the controllable bidirectional AC switch is packaged in the housing. 
     
     
         17 . The integrated circuit according to  claim 13 , wherein the integrated circuit does not comprise a microprocessor. 
     
     
         18 . The integrated circuit according to  claim 13 , wherein the number of pins of the integrated circuit is less than four. 
     
     
         19 . A pump, comprising: a pump housing having a pump chamber, an entrance and an exit in communication with the pump chamber, an impeller rotatably disposed in the pump chamber, and a motor component configured to drive the impeller, wherein the motor component has the features according to  claim 1 . 
     
     
         20 . A fan, comprising: an impeller and a motor component configured to drive the impeller, wherein the motor component has the features according to  claim 1 .