Combined structure for magnetic steel and magnetic loop of motor

Abstract

The invention relates to a combined structure for magnetic steel and magnetic loop of a motor, consisting of a magnetic loop, a support core, a fixed end plate and a rotating shaft, wherein a corresponding number of dovetail grooves are arranged according to the number of magnetic poles by the periphery of the magnetic circuit, V-shaped teeth bearing the radial torque are designed on the internal circular surface and supported on the external diameter of the core, a plurality of equal support arms are arranged, double dovetail locking pieces having the same number as that of the magnetic poles are arranged on the fixed end plate and on the external diameter of the plate. The method for processing the magnetic isolating piece into V shape by using the magnetic isolating material through a die can effectively overcome the drawbacks of the old-fashioned products during the production. The structure is simple and convenient to produce and process.

Description

technical field [0001] The invention relates to a rotor structure for a permanent magnet motor, in particular to a combined structure of a motor magnetic steel and a magnetic circuit. Background technique [0002] In the prior art, it is very common to use magnets as the magnetic poles of the rotor. There are generally two traditional methods for installing and fixing the magnets: one is the mounting method, which uses glue to attach the magnets to the rotor core. The known defects of installation using this process method are: 1. The glue is not evenly applied, the surface of the magnetic steel is not cleaned thoroughly, the curing time is not enough, the curing temperature is improperly controlled, and the reliability is poor. The glue will be damaged due to high or low temperature. Failure, magnetic steel falls off, damages the motor, and causes serious consequences; the second method uses polymer one-time injection molding. The known defects of this method are: special i...

AI Technical Summary

Problems solved by technology

The known defects of installation using this process method are: 1. The glue is not evenly applied, the surface of the magnetic steel is not cleaned thoroughly, the curing time is not enough, the curing temperature is improperly controlled, and the reliability is poor. The glue will be damaged due to high or low temperature. Failure, magnetic steel falls off, damages the motor, and causes serious consequences; the second method uses polymer one-time injection molding. The known defects of this method are: special injection molding machines and extremely complicated molding molds are used, and the investment cost of equipment and molds is extremely high.

But the most important problem is that part of the magnetic steel will form invisible cracks after forming, which seriously affects the magnetic performance. If the assembled rotor is used in a harsh environment, high and low temperature impact tests are required, and the pass rate is very low.

Both of the above two methods have defects such as difficult processing technology, unguaranteed position accuracy, and poor balance accuracy of the rotor after assembly.

In order to eliminate the rotor unbalance, the increased calibration cost is very high, forming a tendency in the market for high-quality permanent magnet motors to be expensive

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