Built-in permanent magnet motor

Abstract

The invention relates to the field of permanent magnet motors, and discloses a built-in permanent magnet motor. The built-in permanent magnet motor comprises a case, a regular polygonal stator iron core, an asymmetric hybrid rotor iron core, permanent magnets, a shaft, windings and insulating frames. The regular polygonal stator iron core is defined by a plurality of T-shaped tooth connection yokes. The contact part of the regular polygonal stator iron core and the case forms a contact area, and a gap between the regular polygonal stator iron core and the case forms a filling area. The asymmetric hybrid rotor iron core comprises a shaft sleeve, a shaft hole, a fan area, connecting bridges and supporting protrusions and contains full-connecting-bridge-type laminations and a half-connecting-bridge-type lamination. The full-connecting-bridge-type laminations are located at the two ends of the asymmetric hybrid rotor iron core, and the half-connecting-bridge-type lamination is clamped by the full-connecting-bridge-type laminations in a wrapped mode in the axial direction. Tooth parts of all the T-shaped tooth connection yokes are wrapped with the insulating frames. The windings are wound around the insulating frames. According to the built-in permanent magnet motor, the production technology of the motor can be simplified, and the structural strength of the motor can also be improved.

Description

technical field [0001] The invention relates to the field of permanent magnet motors, in particular to a built-in permanent magnet motor. Background technique [0002] Traditional brushless DC motors use surface-mounted magnetic tiles or built-in radially magnetized magnet steel structures, which have low power density and are limited by cost factors. The magnetic flux per pole of the motor is increased by tangentially magnetized parallel magnetic circuit structures. The existing tangential magnetization structure still has the problem of large flux leakage, which limits the performance improvement of the motor. [0003] Patent CN201611226568.0 designs a rotor core, which has at least one tooth sector disconnected from the rotor collar, and at least one tooth sector connected to the shaft sleeve. This suppresses magnetic flux leakage near the axis. The rotor iron core shaft sleeve is provided with a positioning protrusion for positioning and supporting the permanent magnet...

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents only rely on parameters such as stator slot width, tooth width, and yoke width to average the flux density, and fail to consider the influence of the stator shape and structure on the motor magnetic field and loss, etc., and are not suitable for high power density motor structures. , also in order to reduce the vibration and noise of the motor through the combination method between the stator core and the casing, no structure that can comprehensively consider the power density and suppress vibration and noise

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