Disc type motor rotor with pole shoe composite magnetic pole structure

Abstract

The invention discloses a disc type motor rotor with a pole shoe composite magnetic pole structure, and relates to the field of motors. The disc type motor rotor comprises a rotor supporting disc, a hole is formed in the center of the rotor supporting disc, and a groove is formed in the surface of one side of the rotor supporting disc and used for installing a rotor core and composite magnetic poles; the rotor iron core is of an annular structure, is arranged at the bottom of the groove and is tightly attached to the rotor supporting disc, T-shaped baffles distributed in the radial direction are arranged on a surface of a side, away from the rotor supporting disc, of the rotor iron core, and the T-shaped baffles divide the rotor iron core into a plurality of fan-shaped spaces at equal intervals along the circumference; the composite magnetic poles are arranged in the fan-shaped spaces on the rotor iron core; the composite magnetic poles comprise permanent magnets and pole shoes, and the pole shoes made of composite soft magnetic materials are installed on the surface of the permanent magnet. The radians of the pole shoes on the surface of the permanent magnet can be adjusted, sinewave air gap flux density is generated, the output torque of a motor is smooth, the pole shoes can protect the permanent magnets against field loss under the action of a demagnetization field, the field weakening capacity of the motor is improved, and the motor is easy to machine and suitable for batch production.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a disc motor rotor with a pole shoe compound magnetic pole structure. Background technique [0002] The permanent magnets of the rotors of most disc motors adopt a surface-mounted structure, and the permanent magnets directly face the stator core. The harmonic magnetic field in the air-gap magnetic field will produce an eddy current effect on the permanent magnets, causing the permanent magnets to heat up, even in the event of a short circuit or other faults. In this case, the demagnetization field caused by the instantaneous large current directly acts on the permanent magnet, causing the permanent magnet to demagnetize, making the performance of the motor degrade or even unable to run. Moreover, since the surface-mounted magnetic pole structure of the permanent magnet is equivalent to an air gap in thickness, the inductance of the stator winding on the AC-D axis is very close, w...

AI Technical Summary

Problems solved by technology

[0002] The permanent magnets of the rotors of most disc motors adopt a surface-mounted structure, and the permanent magnets directly face the stator core. The harmonic magnetic field in the air-gap magnetic field will produce an eddy current effect on the permanent magnets, causing the permanent magnets to heat up, even in the event of a short circuit or other faults. The demagnetization field caused by the instantaneous large current directly acts on the permanent magnet, causing the permanent magnet to demagnetize, making the performance of the motor degrade or even unable to run

In addition, since the permanent magnet surface-mounted magnetic pole structure is equivalent to an air gap, the inductance of the stator winding is very close to the AC-D axis, which makes the motor's magnetic field weakening capability poor.

Images