Built-in permanent-magnet synchronous motor

Abstract

The invention discloses a built-in permanent-magnet synchronous motor. The built-in permanent-magnet synchronous motor comprises a rotor iron core and a rotor shaft, wherein a plurality of pairs of magnetic poles are arranged on the rotor iron core and are arranged around the rotor shaft, the plurality of pairs of magnetic poles are divided to two groups of magnetic poles in average, and for arbitrary one group of magnetic poles, each magnetic pole is arranged at the other side, facing a symmetric middle line in a deviation way by taking the symmetric middle line arranged between the magnetic poles at two sides of the group as an axis, and the distances between magnetic isolation bridges between the magnetic poles in the arbitrary one group of magnetic poles are equal. In the abovementioned built-in permanent-magnet synchronous motor, a mode of magnetic pole deviation is relatively simple, the rotor structure of the built-in permanent-magnet synchronous motor is relatively convenient to improve, and the built-in permanent-magnet synchronous motor is also easy to operate; and moreover, with the built-in permanent-magnet synchronous motor improved according to the abovementioned mode, the cogging torque amplitude can be reduced to a great extent, and the fluctuation of an output torque is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a built-in permanent magnet synchronous motor. Background technique [0002] We know that permanent magnet synchronous motors have a series of advantages such as simple structure, low loss, high power factor, and high efficiency; however, permanent magnet synchronous motors have some defects, such as torque fluctuations, which will affect the control accuracy of the system and cause vibration and noise. Places with high requirements for work performance have higher requirements for torque fluctuation standards. [0003] In order to weaken the torque fluctuation of the motor, in terms of the design of the motor body, the existing surface-mounted permanent magnet motor rotors generally use unequal-thickness magnets, or split oblique poles or inclined slots; and for built-in rotor structures, generally use In the way of the chute, the chute complicates the manufactu...

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Problems solved by technology

[0002] We know that permanent magnet synchronous motors have a series of advantages such as simple structure, low loss, high power factor, and high efficiency; however, permanent magnet synchronous motors have some defects, such as torque fluctuations, which will affect the control accuracy of the system and cause vibration and noise. Places with high requirements for working performance have higher requirements for torque fluctuation standards

[0003] In order to weaken the torque fluctuation of the motor, in terms of the design of the motor body, the existing surface-mounted permanent magnet motor rotors generally use unequal-thickness magnets, or split oblique poles or inclined slots; and for built-in rotor structures, generally use The way of the chute, the chute makes the manufacturing complicated and increases the cost, and at the same time may reduce the output electromagnetic torque

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