AC motor

Patent metadata

Field	Value
Publication number	US-9276510-B2
Application number	US-201414323847-A
Country	US
Kind code	B2
Filing date	Jul 3, 2014
Priority date	May 10, 2011
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

An embodiment of the invention provides an AC motor that is driven by an AC voltage. The AC motor includes a motor coil, a switch circuit, a position detector and a controller. The motor coil receives the AC voltage to drive an axis of the motor. The switch circuit is coupled to the motor coil and controls a current passing through the motor coil. The position detector detects the position of a motor rotor to output a polarity signal. The controller controls the switch circuit according to the polarity signal and the AC voltage to make the current to be a first current with a first direction or a second current with a second direction.

First claim

What is claimed is:

1. An AC motor driven by an AC voltage, comprising:
a first motor coil and a second motor coil to receive the AC voltage;
a switch circuit electrically connected to the first motor coil and the second motor coil to control a first current passing through the first motor coil or a second current passing through the second motor coil;
a position detector, comprising a Hall element to detect a position of a rotor and outputting a polarity signal;
a controller to receive the polarity signal from the position detector, and control the switch circuit to make the current be the first current with a first direction or the second current with a second direction according to the AC voltage and the polarity signal, wherein the first direction is opposite to the second direction; and
an AC/DC transformer for converting the AC voltage into a DC voltage, and outputting the DC voltage to the controller and the position detector.

2. The AC motor as claimed in claim 1 , wherein the AC voltage is provided by an AC voltage source, and the switch circuit comprises:
a first switch device, electrically connected between a positive input terminal of the AC voltage source and a first terminal of the first motor coil;
a second switch device, electrically connected between a negative input terminal of the AC voltage source and the second terminal of the first motor coil;
a third switch device, electrically connected between the positive input terminal of the AC voltage source and a first terminal of the second motor coil; and
a fourth switch device, electrically connected between the negative input terminal of the AC voltage source and the second terminal of the second motor coil.

3. The AC motor as claimed in claim 2 , wherein when the AC voltage is positive voltage and the polarity signal is a first polarity signal, the first switch device and the second switch device are turned on, the third switch device and the fourth switch device are turned off, and the direction of the first current is the first direction.

4. The AC motor as claimed in claim 2 , wherein when the AC voltage is positive voltage and the polarity signal is a second polarity signal, the first switch device and the second switch device are turned off, the third switch device and the fourth switch device are turned on, and the direction of the second current is the first direction.

5. The AC motor as claimed in claim 2 , wherein when the AC voltage is negative voltage and the polarity signal is a first polarity signal, the first switch device and the second switch device are turned off, the third switch device and the fourth switch device are turned on, and the direction of the second current is the second direction.

6. The AC motor as claimed in claim 2 , wherein when the AC voltage is negative voltage and the polarity signal is a second polarity signal, the first switch device and the second switch device are turned on, the third switch device and the fourth switch device are turned off, and the direction of the first current is the second direction.

Assignees

• Delta Electronics Inc

Inventors

• Huang Yueh-Lung
• Hsieh Tsung-Jung
• Wu Yen-Hung

Classifications

• H02P2207/05

  Synchronous machines, e.g. with permanent magnets or DC excitation · CPC title

• H02P6/16 Primary

  Circuit arrangements for detecting position · CPC title

• H02P6/008

  Electricity · mapped topic

• H02P6/26 Primary

  Arrangements for controlling single phase motors · CPC title