Permanent magnet motor with transverse magnetic field

Abstract

The invention provides a permanent magnet motor with a transverse magnetic field, which comprises a shell, a plurality of magnet yokes, a plurality of permanent magnets and a center shaft. The magnet yokes are located on the inner side of the shell, the permanent magnets correspond to the magnet yokes, each magnet yoke is provided with two arms arranged oppositely and a channel located between the arms, the permanent magnets are located outside the channels, the arms are provided with tail ends corresponding to the permanent magnets, end surfaces of the tail ends face to magnetic pole surfaces of the permanent magnets, and an air gap is arranged between the end surface of each tail end and the corresponding magnetic pole surface.

Description

technical field [0001] The invention relates to the field of permanent magnet motors, in particular to a permanent magnet motor suitable for the wheel hubs of electric vehicles and ships. Background technique [0002] In the existing technology, the transverse magnetic field permanent magnet motor is a special motor with high torque density, which has great development prospects in the fields of direct drive ship / vehicle electric propulsion and wind power generation systems. The common transverse magnetic field The permanent magnet motor is designed as a flat-plate magnetic field structure with a unilateral stator. The permanent magnets are evenly pasted on the rotor surface, and the adjacent permanent magnets are respectively magnetized into different polarities. The U-shaped stator core module uses a double pole pitch The distance is evenly distributed on the entire circumference, and the two teeth of the U-shaped stator core correspond to the two poles of the opposite pol...

AI Technical Summary

Problems solved by technology

However, the structure of the above-mentioned motor is complex and difficult to assemble. Since the poles of the permanent magnet protrude into the U-shaped groove, the air gap of each unit exists independently and needs to be assembled separately. This affects the accuracy of the assembly process of the various components inside the motor. The requirements are very high, and there are many air gaps that need to be guaranteed during assembly (for example, for a three-phase motor, the double-sided stator structure needs to ensure six air gaps), so it is difficult to ensure the size of each air gap, and because the motor Unilateral magnetic pull exists all the time during the assembly process, which makes it more difficult to guarantee the accuracy of the air gap size during the assembly process, which often easily leads to problems such as uneven air gap size and large deviation, thus affecting the torque overload multiple and torque Density will make the stability of the motor worse and the output power will be reduced

Therefore, it is difficult for this motor to be popularized in the field of high-volume, low-cost small and medium power

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