Rotor plate of highly effective permanent magnetism synchronous motor

Abstract

The invention relates to a motor, more specifically to a rotor punching plate of high efficiency permanent magnet synchronous motor. The rotor punching plate of high efficiency permanent magnet synchronous motor has a plurality of rotor grooves provided thereon in two sizes wherein the depth ratio of shallow grooves depth and the common grooves depth is between 0.6-0.95. Nonuniform magnet steel grooves are opened on the rotor punching plate, the width ratio of the middle width and the both ends width thereof is between 0.5-0.95. This invention can not only improve start performance of the motor but also eliminate part of harmonic wave which is harmful to motor, wearing, temperature rising and noise of the permanent magnet synchronous motor can also be obviously depressed, thus the efficiency thereof can be improved.

Description

field of invention [0001] The invention relates to a motor, more specifically, to a rotor punch of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used due to their high efficiency, energy saving, high power density and high torque density. Although the stator structure and manufacturing process of the permanent magnet synchronous motor are similar to the asynchronous AC motor, the rotor structure of the two is different. The rotor of the permanent magnet synchronous motor is embedded with magnetic steel (rare earth magnetic material), and the magnetic pole is formed by the magnetic steel. Whether the design of the rotor plate is reasonable is the key to the success of the permanent magnet synchronous motor design. The shape and size of the rotor grooves of the rotor punch of the existing self-starting permanent magnet synchronous motor are generally the same, and the width of the magnetic steel groove...

AI Technical Summary

Problems solved by technology

On the one hand, the sinusoidal distortion rate of the air-gap flux density waveform of the permanent magnet synchronous motor is high, resulting in a large number of harmonics that affect the performance of the motor, increasing the loss of the motor, and increasing the vibration and noise of the motor; on the other hand, for For permanent magnet synchronous motors with small power, due to the small size of the punching sheet, the size of the magnetic steel groove is limited, so that the magnetic steel that can be placed is also small, which affects the magnetic density of the motor, thus affecting the power density of the motor and the size of the motor. The starting performance of the

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