Variable speed motor

Abstract

A variable speed motor is disclosed. The variable speed motor includes: a main winding including first and second main windings, and an auxiliary winding including first and second auxiliary windings, wherein the main winding and the auxiliary winding are wound on a stator to form a plurality of poles; and a plurality of relays for performing a switching operation between serial / parallel connections of the first and second main windings or the first and second auxiliary windings. The variable speed motor includes: a stator on which a 4-pole winding and a 12-pole winding are wound; a plurality of tap windings connected in series to a 4-pole main winding 4 poles, for extending a variable range of rotation speed of the motor during a 4-pole operation mode; and a phase control circuit for varying rotation speed of the motor by controlling a phase of an input power-supply signal during a 12-pole operation mode. Therefore, the variable speed motor greatly extends the range of a variable speed of the motor, and does not require an additional drive unit for varying the motor speed, such that production costs are greatly reduced, and electromagnetic vibration noise caused by a low-speed control mode of the motor is also greatly reduced. Rotation speed of the motor is controlled by a phase control operation and a winding switching operation, such that the variable speed motor effectively controls the motor speed, and greatly reduces power consumption.

Description

technical field [0001] The present invention relates to variable speed motors, and more particularly to a variable speed motor which allows a relay to switch between series / parallel connection of at least one winding consisting of an auxiliary winding and a main winding, switching the tap winding Connected to 4-pole main windings to perform tap changer windings, thereby greatly increasing the speed range of the motor. Background technique [0002] figure 1 An exploded perspective view showing the rotor and stator contained in a conventional external rotating electrical machine. figure 2 is the circuit diagram of a conventional capacitor-type single-phase induction motor. [0003] Generally, an electric machine includes a stator on which windings are mounted and a rotor on which permanent magnets are mounted. The motor generates periodic current changes in the windings attached to the stator, and generates torque in the rotor by generating a constantly changing magnetic f...

AI Technical Summary

Problems solved by technology

[0014] If the user or operator wants to use the tap changer winding to change the speed of the motor, since the minimum adjustment speed of the motor is approximately equivalent to a predetermined value of 2 / 3 of the synchronous speed of the motor, there is a limit when adjusting the speed of the motor, so it is very difficult Difficult to expand the speed range of the motor

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