Hybrid permanent magnet type electric rotating machine and manufacturing method thereof

Abstract

A stator is constructed by winding excitation coils around respective main poles in a hybrid permanent magnet type electric rotating machine. A rotor is constructed by fixing a first rotor unit, which consists of a pair of rotor cores and a magnetic material sandwiched between the rotor cores, and a second rotor unit, which has the same construction as the first rotor unit, to a rotation shaft. The rotor is assembled to the stator to form an assembled body. The magnet material of the first rotor unit is magnetized in the axial direction by a magnetizing flux passing through a half of the assembled body in the axial direction. The magnet material of the second rotor unit is magnetized in the axial direction in an opposite polarity by a magnetizing flux passing through the remaining half of the assembled body in the axial direction.

Description

technical field [0001] The present invention relates to a hybrid (hereinafter abbreviated as HB) permanent magnet rotary motor used in OA equipment for processing images of facsimile machines, inkjet printers, laser printers, copiers, etc., and a manufacturing method thereof. Background technique [0002] 14 and 15 show a conventional 2-phase HB stepping motor. FIG. 14 is a longitudinal section, and FIG. 15 is a front view showing the relationship between the rotor core and the stator core. This stepping motor 100 has a stator 110 and a rotor 130. The stator 110 has a stator core 111 having two phases and eight main poles. The rotor 130 is fixed to a rotating shaft 120 rotatably supported inside the stator. The stator 110 is constituted by sandwiching a stator core 111 formed of laminated silicon steel plates from both sides in the axial direction by brackets 112 and 113 formed of non-magnetic materials. The excitation coil 114 wound on the bobbin 115 is wound. On the stat...

AI Technical Summary

Problems solved by technology

[0007] However, in the motor structure disclosed in U.S. Patent No. 6,781,260, it is necessary to magnetize the two permanent magnets into opposite magnetism, and an appropriate magnetization method has not been established.

That is, the permanent magnet is magnetized by the magnetic flux reaching the saturation magnetic flux density, but in the case of magnetizing after the rotor or the motor is completed, two permanent magnets are magnetized at the same time when using a conventionally known magnetizing device using an air-core coil , since the magnetizing flux repels each other in the axial direction, the magnetization of the permanent magnet part is insufficient

In addition, when the two permanent magnets are magnetized with a set time difference at a time, the magnetic flux that magnetized the permanent magnet of one rotor unit leaks to the other rotor unit, and the leakage flux causes the other rotor unit to be magnetized. The permanent magnet is magnetized to the opposite magnetic field from the desired magnetic field, or the permanent magnet of the other rotor unit that has already been magnetized is demagnetized

Therefore, in the prior art, the rotor is assembled using components magnetized with a single magnet. However, in such a method, the permanent magnet attracts iron powder or dust during assembly, which makes assembly difficult and reduces the reliability of the completed rotating electrical machine. question

Images