Rotor for synchronous motor

Abstract

A rotor for a synchronous motor includes a main core which is formed with a shaft hole disposed in a center area thereof, a plurality of inductive conductor slots arranged along an outer area thereof, and a plurality of magnet slots each arranged between the shaft hole and the inductive conductor slots; an inductive conductor which is inserted into each inductive conductor slot; a first and a second permanent magnet units which each have at least one first permanent magnet and at least one second permanent magnet having different polarities, the first permanent magnet and the second permanent magnet being inserted into the magnet slots and being disposed opposite to each other with the shaft hole being interposed therebetween; and a magnetic flux loss prevention member which is disposed between the first permanent magnet unit and the second permanent magnet unit and prevents loss of magnetic flux, intervals between the inductive conductor slots become small as the inductive conductor slots go from centers of the first and second permanent magnet units to the magnetic flux loss prevention member. Thus, intervals of inductive conductor slots in which inductive conductors are inserted become small as the inductive conductor slots go from centers of permanent magnet units to a magnetic flux loss prevention member, and thus, torque ripple generated in a portion where polarities of permanent magnets are changed in driving a synchronous motor is prevented, thereby reducing vibrations and noises.

Description

technical field [0001] The device and the method according to the invention relate to a rotor for a synchronous motor which is improved with respect to the arrangement of the inductive conductor slots. Background technique [0002] Generally, an electric motor converts electrical energy into mechanical energy and obtains rotational force. [0003] Motors can be classified into AC motors and DC motors. [0004] An asynchronous start permanent magnet (LSPM) synchronous motor (line start permanent magnet synchronous motor), which is a type of AC motor, can obtain stable rotation characteristics synchronous with an input frequency. The LSPM synchronous motor changes the frequency of the power supply, thereby easily changing the rotation speed of the motor. [0005] In the LSPM synchronous motor, if power is supplied to the stator coils, the rotor provided in the stator rotates. [0006] In the initial operation of the motor, the rotor starts to rotate by magnetic action gener...

AI Technical Summary

Problems solved by technology

[0008] In a conventional rotor for a synchronous motor, a plurality of induction conductor slots are regularly arranged regardless of the position of the permanent magnet, so that when the synchronous motor is driven, torque ripple is generated, causing vibration and noise

In addition, the amount of magnetic flux directed from the permanent magnets to the stator is reduced, thereby reducing the efficiency of the synchronous motor

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