Motor stator and permanent magnet synchronous motor

Abstract

The invention provides a motor stator and a permanent magnet synchronous motor. The motor stator comprises a stator core (5), wherein the stator core (5) comprises a stator tooth part (6), the stator tooth part (6) comprises a stator tooth boot (7), the stator tooth boot (7) sequentially comprises a second extension section (9) and a first extension section (8) from outside to inside in the radial direction on the cross section of the stator core (5), and radial thickness of the second extension section (9) is larger than that of the first extension section (8). According to the motor stator provided by the invention, the motor leakage flux can be reduced from the stator side, the output torque is increased, and motor efficiency is improved.

Description

technical field [0001] The present application relates to the field of motor technology, in particular to a motor stator and a permanent magnet synchronous motor. Background technique [0002] At present, in the industry and home appliance industry, there are a large number of applications that pursue low speed and high torque. For low-speed high-torque motors, when the permanent magnets are radially placed and tangentially magnetized, the motor can generate higher air-gap flux density due to its good magnetization effect on the rotor, and can make full use of the AC / D axis asymmetry to generate The reluctance torque increases the torque density and achieves superior performance. [0003] However, when the motor with the above structure is used to meet the performance requirements of low speed and high torque, the number of poles of the motor is much larger than that of conventional motors, and the volume increases accordingly, and a large amount of magnetic flux leakage on...

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Problems solved by technology

[0003] However, when the motor with the above structure is used to meet the performance requirements of low speed and high torque, the number of poles of the motor is much larger than that of conventional motors, and the volume increases accordingly, and a large amount of magnetic flux leakage on the stator side will reduce the output torque of the motor and affect the energy efficiency of the motor parameter

In the prior art, first of all, the motors within the conventional speed and torque range are mostly targeted, and low-speed high-torque motors are not specifically mentioned; secondly, the rotor structure is usually improved, and the influence of magnetic flux leakage on the stator is not considered. Performance improvement such as torque is very limited

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