SYNCHRONOUS MOTOR ASSEMBLY, PUMP, AND VENTILATION FAN USING SAME

• US 20180109208A1
• Filed: 10/19/2017
• Published: 04/19/2018
• Est. Priority Date: 10/19/2016
• Status: Abandoned Application

• Current Assignee: Johnson Electric SA 125 Rue de Progres La Chaux de Fonds Switzerland (Johnson Electric Holdings Limited)
• Original Assignee: Johnson Electric SA 125 Rue de Progres La Chaux de Fonds Switzerland (Johnson Electric Holdings Limited)
• Inventors: LI, Yue, ZHOU, Chui You, YI, Hong Liang, ZHANG, Yong Gang, WANG, Yong
• Application Number:
  US15/788,281
• Publication Number:
  US 20180109208A1
• Time in Patent Office: Days
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 15/0066 by changing the speed, e.g. of the driving engine
• CPC Class Codes: F04D 25/06 the pump being electrically driven F04D25/08 takes precedence
• CPC Class Codes: F04D 25/08 the working fluid being air, e.g. for ventilation
• CPC Class Codes: F04D 27/004 by varying driving speed
• CPC Class Codes: H02P 1/027 Special design of starting resistor
• CPC Class Codes: H02P 2207/05 Synchronous machines, e.g. with permanent magnets or DC excitation
• CPC Class Codes: H02P 6/06 Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
• CPC Class Codes: H02P 6/16 Circuit arrangements for detecting position
• CPC Class Codes: H02P 6/18 without separate position detecting elements
• CPC Class Codes: H02P 6/26 Arrangements for controlling single phase motors
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A synchronous motor assembly includes a motor connected between two nodes of an AC power source, a motor drive circuit, and a regulation unit. The drive circuit drives the motor to rotate. The regulation unit regulates a rotation speed of the motor via regulating the motor to different steady voltage points.

Claims

1. A synchronous motor assembly, comprising:

a motor connected between two nodes of an AC power source;

a motor drive circuit driving the motor to rotate; and

a regulation unit regulating a rotation speed of the motor via regulating the motor to different steady voltage points.

2. The synchronous motor assembly of claim 1, wherein the rotation speed of the motor n⇐

60f/p rpm, wherein f is a frequency of the AC power source and p is the number of pole pairs of the motor.

3. The synchronous motor assembly of claim 1, wherein the regulation unit is a rheostat connected between the AC power source and the motor, and the motor is regulated to the different steady voltage points by regulating a resistance of the rheostat.

4. The synchronous motor assembly of claim 1, wherein the regulation unit comprises a plurality of motor taps and a switch, and the motor is regulated to the different steady voltage points by turning on different motor taps via the switch.

5. The synchronous motor assembly of claim 1, wherein the rotation speed of the motor is n=60f/p−

300*N, where f is a frequency of the AC power source, p is the number of pole pairs of the motor, and N is a natural number which is less than f/10p.

6. The synchronous motor assembly of claim 3, wherein the rheostat and the motor drive circuit are integrated in one integrated circuit.

7. The synchronous motor assembly of claim 6, wherein the integrated circuit comprises at least two of a rectifier, a detecting circuit, a switch control circuit and a controllable bidirectional AC switch, the rectifier converts the AC power source to a DC power to supply the detecting circuit, the detecting circuit detects a magnetic pole position of a rotor of the motor, 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 predetermined way according to the magnetic pole position and a polarity of the AC power source.

8. The synchronous motor assembly of claim 7, wherein the motor drive circuit further comprises a voltage dropping circuit, the rectifier, the detecting circuit, and the switch control circuit, and the voltage dropping circuit are packaged in the integrated circuit.

9. The synchronous motor assembly of claim 1, wherein the motor is a single phase permanent magnet synchronous motor, the motor comprises a stator and a rotor rotatably received in the stator, a non-uniform air gap is formed between the stator and the rotor.

10. The synchronous motor assembly of claim 3, wherein a voltage applied on the motor is adjusted via adjusting a resistance of the rheostat.

11. The synchronous motor assembly of claim 4, wherein the regulation unit comprises three motor taps, and the switch is a selector switch, the selector switch is controlled to electrically couple with one of the three motor taps.

12. The synchronous motor assembly of claim 4, wherein each motor tap corresponds to one turn of a winding of the motor, when the switch is electrically coupled with different motor taps, a resistance and turn of the winding is changed and the rotation speed of the motor is adjusted in different steady voltage points.

13. A pump comprises a synchronous motor assembly of claim 1.

14. The pump of claim 13, wherein the rotation speed of the motor n⇐

60f/p rpm, wherein f is a frequency of the AC power source and p is the number of pole pairs of the motor.

15. The pump of claim 13, wherein the regulation unit is a rheostat connected between the AC power source and the motor, and the motor is regulated to the different steady voltage points by regulating a resistance of the rheostat.

16. The pump of claim 13, wherein the regulation unit comprises a plurality of motor taps and a switch, and the motor is regulated to the different steady voltage points by turning on different motor taps via the switch.

17. The pump of claim 13, wherein the rotation speed of the motor is n=60f/p−

300*N, where f is a frequency of the AC power source, p is the number of pole pairs of the motor, and N is a natural number which is less than f/10p.

18. A ventilation fan comprises a synchronous motor assembly of claim 1.