AC motor

摘要

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.

主权项

1. A DC motor driven by an AC voltage from an AC power source, comprising:
a motor coil; a switch circuit electrically connected to the motor coil for controlling a current passing through the motor coil, wherein the switch circuit is further connected between a positive terminal of the AC power source and a negative terminal of the AC power source; a position detector, comprising a Hall element, for detecting a position of a rotor and outputting a magnetic polarity signal; a controller for receiving the magnetic polarity signal from the position detector, and controlling the switch circuit to make the current be a first current with a first direction or a second current with a second direction according to an electrical polarity of the AC voltage and the magnetic polarity signal, wherein the first direction is opposite to the second direction, and the electrical polarity is positive or negative; 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.