Polarizing device for permanent magnet rotor

Abstract

A polarizing device includes: a polarizing iron core (13) facing to a specified number of permanent magnets (11) among plural unmagnetized permanent magnets (11) arranged at specified intervals circumferentially on a rotor (12); a first coil (15) wound at a position facing to a desired permanent magnet (11a) of the polarizing iron core (13); a pair of second coils (16) each arranged having a specified interval according to the first coil (15) circumferentially on the polarizing iron core (13) and whose direction of the flowing current is different from that of the first coil (15); and a power source (22) for supplying the current to the first and second coils (15, 16), and either of the permanent magnet (11a) and first coil (15) is relatively moved and each permanent magnet (11) is magnetized to form a magnetic pole in turn by the current fed from the power source (22).

Description

technical field [0001] The present invention relates to a magnetizing device in which unmagnetized permanent magnets provided on the peripheral surface of a rotor are sequentially magnetized to form magnetic poles. Background technique [0002] Previously, among the magnetic poles of the permanent magnet rotor, there were cases where permanent magnets were applied as the magnetic poles of the rotor in which the magnetic poles were assembled to the rotor after magnetization, and there were also cases in which unmagnetized magnetic poles that had not been magnetized were assembled It is magnetized and magnetized after reaching the rotor. [0003] However, in the case of magnetizing the magnetic poles before assembling into the rotor, the assembly work becomes difficult due to strong suction force, so in larger-sized rotors, the magnetic poles are usually magnetized after assembly. [0004] As a conventional magnetizing device for this type of permanent magnet rotor, for examp...

AI Technical Summary

Problems solved by technology

[0006] The conventional magnetization device of the permanent magnet rotor realizes a miniaturized device, as described above, by magnetizing the magnetized iron core of one magnetic pole on which the coil is wound, while sequentially switching the parallel current flowing in the coil. Corresponding to the direction of the current of each unmagnetized permanent magnet, and magnetized into N pole or S pole, so as in the attached Figure 5 As shown in , the magnetic flux 3 is generated by the current flowing in the coil 2 wound on the magnetized iron core 1, and assuming that the corresponding unmagnetized permanent magnet 4a is magnetized into the S pole, from the magnetic flux 3 in this figure The distribution can be clearly seen that the magnetic flux 3 passes through the corresponding unmagnetized permanent magnets 4b, 4c in the vicinity of the unmagnetized permanent magnet 4a in the opposite direction to the magnetization direction, and in the opposite direction to the direction in which the magnetization should be performed Magnetization is performed, therefore, in the case where the magnetization is actually performed in the desired direction at the position corresponding to the magnetized core 1, demagnetization must be performed for the magnetization in the opposite direction, therefore, it is necessary to change the current flowing in the coil 2 every time, Therefore, there is a problem that it is difficult to control the current

[0007] In addition, in the case where the unmagnetized permanent magnet is a rare-earth magnet, demagnetization is difficult, and remagnetization requires a considerably stronger magnetic field than that of the unmagnetized region, so there is a problem that the size of the current delivery unit becomes large

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