Application apparatus, motor assembly and integrated circuit for driving motor

Abstract

A motor assembly and an integrated circuit for motor drive. The motor assembly includes a single-phase permanent-magnet synchronous motor capable of being powered by an AC power source and an integrated circuit, wherein the single-phase permanent-magnet synchronous motor comprises a stator and a permanent-magnet rotor capable of rotating relative to the stator, the stator comprises a stator iron core and a stator winding wound on the stator iron core, the integrated circuit comprises: a housing and enabling the single-phase permanent-magnet synchronous motor to be started along a fixed direction when the drive circuit is energized each time.

1 . A motor assembly, comprising: a single-phase permanent magnetic synchronous motor and an integrated circuit which are powered by an alternating current (AC) power supply, wherein the single-phase permanent magnetic synchronous motor comprises a stator and a permanent magnetic rotor rotatable relative to the stator, the stator comprises a stator core and a stator winding wound on the stator core; the integrated circuit comprises a housing, a plurality pins extended out from the housing, and a driving circuit, wherein the driving circuit is packaged in the housing and enables the single-phase permanent magnetic synchronous motor to start and rotate in a fixed direction every time when the single-phase permanent magnetic synchronous motor is energized. 
     
     
         2 . The motor assembly according to  claim 1 , wherein the driving circuit comprises:
 a controllable bidirectional AC switch connected in series with the stator winding and configured to be connected between two terminals of the AC power supply;   a detecting circuit configured to detect a magnetic field polarity of the permanent magnetic rotor; and   a switch control circuit 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 permanent magnetic rotor detected by the detecting circuit.   
     
     
         3 . The motor assembly according to  claim 2 , 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 the magnetic field polarity of the rotor detected by the detecting circuit is a first polarity, or in a case that the AC power supply is in a negative half cycle and the magnetic field polarity of the rotor detected by the detecting circuit is a second polarity opposite to the first polarity. 
     
     
         4 . The motor assembly according to  claim 2 , wherein the driving circuit further comprises a rectifier configured to generate a direct current supplied to the detecting circuit at least. 
     
     
         5 . The motor assembly according to  claim 4 , wherein the rectifier comprises a voltage dropping circuit. 
     
     
         6 . The motor assembly according to  claim 5 , the rectifier is connected in parallel with the controllable bidirectional AC switch. 
     
     
         7 . The motor assembly according to  claim 2 , wherein the controllable bidirectional AC switch is a TRIAC. 
     
     
         8 . The motor assembly according to  claim 2 , 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 assembly according to  claim 2 , wherein the detecting circuit does not comprise a magnetic sensor. 
     
     
         10 . The motor assembly according to  claim 1 , wherein the integrated circuit does not comprise a microprocessor. 
     
     
         11 . The motor assembly according to  claim 1 , wherein the motor assembly does not comprise a printed circuit board. 
     
     
         12 . The motor assembly according to  claim 1 , wherein a non-uniformed 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 when the permanent magnetic rotor is at rest. 
     
     
         13 . The motor assembly according to  claim 1 , wherein the rotor comprises at least one permanent magnet, the rotor operates at a constant rotational speed of 60 f/p circle/minute 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. 
     
     
         14 . An integrated circuit for driving a motor, comprising: a housing, a plurality pins extended out from the housing, and a switch control circuit disposed on a semiconductor substrate, wherein the semiconductor substrate and the driving circuit are packaged in the housing, the driving circuit comprises a controllable bidirectional AC switch connected across two pins, a detecting circuit configured to detect a magnetic field polarity of a rotor of the motor, and a switch control circuit 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 the magnetic field polarity of the rotor detected by the detecting circuit. 
     
     
         15 . The integrated circuit according to  claim 14 , wherein the integrated circuit has only two pins. 
     
     
         16 . An application apparatus, comprising: a motor assembly as  claim 1 . 
     
     
         17 . The application apparatus according to  claim 16 , wherein the application apparatus is one of a pump and a blower. 
     
     
         18 . The application apparatus according to  claim 17 , wherein the pump comprises 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 the motor assembly configured to drive the impeller. 
     
     
         19 . The application apparatus according to  claim 17 , wherein the blower comprises a fan blade and a motor assembly configured to drive the fan blade.