Rare-earth permanent magnetic synchro motor

Abstract

A synchronous motor of rare earth permanent magnetism is prepared as dividing one section of permanent magnet in electrode rotator to be a numbers of small radial sections, sticking section to section by insulation binder to decrease vortex loss caused by conductivity of NdFeB permanent magnet in alternating magnetic field.

Description

(1) Technical field [0001] The invention relates to the field of electrical engineering technology, in particular to the field of research on rotor temperature rise of a rare earth permanent magnet synchronous motor. (2) Background technology [0002] Rare-earth permanent magnet synchronous motors have the characteristics of small size, light weight, high efficiency, etc., and are widely used in the fields of industry and scientific research. Theoretically, when the rare earth permanent magnet synchronous motor works normally, there is no fundamental wave loss on the rotor, and the rotor temperature rise should be low. However, in the actual research process of rare earth permanent magnet synchronous motors, many experiments have found that the rotor temperature rise is higher due to the eddy current loss of the permanent magnets. For example, in the prior art, more neodymium iron boron permanent magnet materials have a resistivity of 1.44×10 -6 Ω.m, with certain electrical condu...

AI Technical Summary

Problems solved by technology

However, in the actual research process of rare earth permanent magnet synchronous motors, many tests have found that the rotor temperature rise is high due to the eddy current loss of the permanent magnets.

For example, the resistivity of the more NdFeB permanent magnet materials used in the prior art is 1.44×10 -6 Ω.m, has a certain conductivity, and will generate eddy current loss in the alternating magnetic field, thereby generating heat, while the thermal conductivity of NdFeB magnets is 7.7cal / m.h.℃, and the heat transfer is poor. In addition, NdFeB magnets are easy to Oxidation and rust make it more difficult for the heat on the magnetic steel to conduct outwards, which intensifies the temperature rise on the rotor

If the rotor temperature is too high, it will cause the danger of demagnetization of NdFeB permanent magnets and affect the normal operation of the motor

However, in the prior art, since the rotor temperature rise of the rare earth permanent magnet synchronous motor is generally ignored, there is no effective equipment or method for solving this problem

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