Permanent magnet type rotating machine

Abstract

The invention is to provide a permanent magnet type rotating machine that is capable of reducing a cogging torque and increasing a rotating torque. The permanent magnet type rotating machine is equipped with: a rotor (24) on which permanent magnets (30) are provided; a stator (40) on which electromagnets (48) are provided; a positional information acquisition unit (60) for obtaining positional information of the permanent magnets (30); and an electromagnet control unit for performing on / off control of the electromagnets (48) on the basis of the positional information. The electromagnets (48) are each configured by coaxially providing a first electromagnet coil (52), which magnetizes a magnetic pole on a core (50) which faces the magnetic pole of each permanent magnet (30) to the opposite polarity to that of the magnetic pole of the permanent magnet (30), and a second electromagnet coil (54), which magnetizes the magnetic pole on the core (50) which faces the magnetic pole of the permanent magnet (30) to the same polarity as that of the magnetic pole of the permanent magnet (30). On the basis of the positional information, the second electromagnet coil (54) is turned on after the first electromagnet coil (52) is turned on and before the coil is turned off, and the first electromagnet coil (52) is turned on after the second electromagnet coil (54) is turned off and before remnant magnetism attributable to the electromagnet (48) becomes zero.

Description

technical field [0001] The present invention relates to a permanent magnet type rotating electric machine in which a permanent magnet is provided on one of a rotor or a stator and an electromagnet is provided on the other, and the electromagnet is controlled to rotate the rotor. Background technique [0002] A permanent magnet type rotating electrical machine has, for example, a structure in which permanent magnets are provided on a rotor and electromagnets are provided on a stator, and the rotor is rotated by using the magnetic force of the permanent magnets and the magnetic force generated by the electromagnets. In the prior art, various permanent magnet type rotating electric machines are disclosed. In this permanent magnet type rotating electric machine, if the cogging torque is large, the rotor will rotate unevenly or the rotation speed will drop, resulting in energy (power) loss, so sufficient rotational torque cannot be obtained. Therefore, how to reduce the cogging ...

AI Technical Summary

Problems solved by technology

Therefore, in Patent Document 1, the rotation of the rotor is hindered by the residual magnetism of the iron core, so that the cogging torque cannot be sufficiently reduced

In addition, since the residual magnetism of the iron core hinders the rotation of the rotor, it takes a long time for the rotor to reach the specified rotational speed, and it is not possible to apply sufficient rotational torque to the rotor

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