Built-in permanent magnet motor

Abstract

The invention relates to the field of a permanent magnet motor and discloses a built-in permanent magnet motor. The motor comprises a casing, a stator core, a rotor core and a permanent magnet, wherein 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 groups comprise a plurality of full-connection bridge laminations which are connected with a first central connection bridge and are distributed along the circumferential direction, laminationsin the semi-connection bridge type lamination group comprise at least one separation punching sheet which is disconnected with the second central connection bridge and is distributed along the circumferential direction, and the full-connection bridge type lamination groups and the semi-connection bridge type lamination group are stacked in the axial direction, so each semi-connection bridge typelamination group is located between the two full-connection bridge type lamination groups, adjacent sectors in the same lamination layer of the full-connection bridge type lamination groups are asymmetric, and the permanent magnets are placed in grooves between the adjacent sectors. The motor is advantaged in that the production process of the motor can be simplified, and the structural strength of the motor can 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] In the existing rotor iron core, at least one tooth sector is disconnected from the rotor collar, and at least one tooth sector is 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. According to t...

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

Images