High-power density permanent magnet motor

Abstract

The invention relates to the field of a permanent magnet motor and discloses a high-power density permanent magnet motor. The motor comprises a casing, a stator core and a rotor core, wherein the stator core is arranged along the circumferential direction of an inner wall of the casing, the rotor core is mounted in the space enclosed by the stator core, the rotor core comprises at least two full-connection bridge type lamination groups and at least one semi-connection bridge type lamination group, laminations in the full-connection bridge type lamination group comprise a plurality of full-connection bridge punching sheets which are connected with a first central connection bridge and are distributed along the circumferential direction, laminations in the semi-connection bridge type lamination group comprise at least one separation punching sheet which is disconnected with a second central connection bridge and is distributed along the circumferential direction, and the full-connectionbridge type lamination groups and the semi-connection bridge type lamination group are stacked in the axial direction, so each semi-connection bridge type lamination group is positioned between the two full-connection bridge type lamination groups, and adjacent sectors of the rotor core are asymmetric. The motor is advantaged in that power density of the motor can be improved.

Description

technical field [0001] The invention relates to the field of permanent magnet motors, in particular to a permanent magnet motor with high power density. 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 collar. This suppresses magnetic flux leakage near the axis. The outer ring of the rotating shaft of the rotor core is provided with a positioning protrusion for positionin...

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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