Permanent magnet motor

Abstract

The invention provides a permanent magnet motor capable of preventing the productivity from being reduced and appropriately fixing the permanent magnet simultaneously, and reducing the vibration and noise and achieving high efficiency. The permanent magnet motor comprises a rotor having a laminated iron core (3) in the rotating shaft direction with a plurality of grooves (4) along the rotating direction and a stator for providing the rotating field for the rotor, wherein, the grooves are laminated with a plurality of flat magnets (5) in the length direction, the permanent magnet motor comprises a rotor end plate (1) arranges at one end in the rotating shaft direction of the laminated iron core (3) for covering an opening part at one side of the grooves (4), a rotor end plate (2) arranged at another end at opposite side of the rotor end plate (1) for covering another opening part at the other side of the groove (4), and a press part (6) for pressing the magnet (5) to the rotor end plate (2) from the inner of the projection in the rotating shaft direction of the groove (4) of the rotor end plate (1).

Description

technical field [0001] The present invention relates to electric motors, particularly permanent magnet motors (IPM motors) with built-in magnets. Background technique [0002] Electric motors can be used for various purposes as a driving source, and are often incorporated into various products for internal use. For example, blowers and compressors can also be used in so-called accessories such as power windows and windshield wipers of automobiles. In recent years, from the viewpoint of influence on the global environment, the demand for high efficiency and energy saving has been increasing, and permanent magnet motors have been used in many cases. [0003] Various studies have been conducted on the structure of fixed magnets in permanent magnet motors. For example, Patent Document 1 and Patent Document 2 disclose permanent magnet rotors in which magnets are fixed by end plates provided on both end surfaces of an iron core laminate. In addition, Patent Document 3 discloses...

AI Technical Summary

Problems solved by technology

At this time, if the length in the direction of the rotation axis is large, the dimensional tolerance and manufacturing error at both ends will increase, and the difference in magnetic properties of each cross-section cannot be ignored.

As a result, during mass production, there is a possibility that the yield may be deteriorated due to individual occurrences due to noise and micro-vibration

That is, even when a plurality of magnets are laminated in the direction of the rotation axis in one slot, there is a problem of how to fix the magnets

[0015] In addition, when a plurality of magnets are laminated in the longitudinal direction in the direction of the rotation axis, the magnet fluxes between adjacent magnets in the direction of the rotation axis may be short-circuited, and the magnet fluxes may not be effectively used.

Furthermore, the unevenness of the magnetic flux between the magnets is caused, which causes electromagnetic noise and micro-vibration, and becomes one of the factors that hinder high efficiency and high reliability.

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