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 polarizing 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, in the magnetic poles of the permanent magnet rotor, there were cases where permanent magnets were applied as the magnetic poles of the rotor: after polarizing, the magnetic poles were assembled to the rotor, and there were also cases where the unmagnetized magnetic poles that had not been magnetized It is polarized and magnetized after assembly into the rotor. [0003] However, in the case of polarizing the magnetic poles before assembling into the rotor, the assembly work becomes difficult due to a strong suction force, so in larger-sized rotors, the magnetic poles are usually polarized after assembly. [0004] As a conventional polarizing device for this type of permanent magnet rotor, for example, that described in Jap...

AI Technical Summary

Problems solved by technology

[0006] The conventional polarizing device of the permanent magnet rotor realizes the miniaturized device, as mentioned above, by magnetizing the polarized core of one pole on which the coil is wound, while sequentially switching the flow in this coil and corresponds to the direction of the current of each unmagnetized permanent magnet, and is polarized 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 polarized core 1, and assuming that the corresponding non-magnetized permanent magnet 4a is polarized into the S pole, the magnetic flux 3 from the figure It 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 Therefore, in the case where the polarization is officially performed in the desired direction at the position corresponding to the polarized core 1, demagnetization must be performed for the polarization in the opposite direction. Therefore, it is necessary to change the coil 2 every time. The current flowing in the middle, so the problem is 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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