Four-phase transverse magnetic field permanent-magnet motor with magnetism-collected structure

Abstract

The invention discloses a four-phase transverse magnetic field permanent-magnet motor with a magnetism-collected structure, and the motor is used for solving the technical problem of high magnetic leakage of the existing transverse magnetic field permanent-magnet motor. The technical scheme of the four-phase transverse magnetic field permanent-magnet motor with the magnetism-collected structure is as follows: a permanent magnet (1), a rotor ring (2) and a rotor permanent magnet (8) are combined to form the magnetism-collected structure rotor unit of the motor, while a stator tooth (4), a stator permanent magnet (9), a stator groove (10) and an auxiliary iron core (13) are combined to form the magnetism-collected structure stator unit of the motor; an insulating ring (3) is arranged between every two phases of magnetism-collected structure rotor units, while an insulating plate (11) is arranged between every two phases of magnetism-collected structure stator units. By virtue of the magnetism-collected structure, the maximal air-gap magnetic field intensity of the permanent-magnet motor is increased to 2.2584 T from 1.13 T in the background art, which is increased by 99.9%; and the magnetic leakage factor of the permanent-magnet motor is reduced to 1.076 from 1.303 and is reduced by 17.4%. The self-positioning force after the composition of four phases is only 18% of that in single phase; however, the change period is shortened to 45 degrees in four phases from 180 degrees in single phase; and therefore, the torque pulsation of the motor is reduced and the performance of the motor is improved.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a four-phase transverse magnetic field permanent magnet motor with a magnetism gathering structure. Background technique [0002] In a traditional radial field motor, the plane where the magnetic field lines are located is in the same plane as the motor motion direction, and the torque density can be increased by increasing the tooth width or increasing the slot area. However, since the stator teeth and slots in the motor are in the same section, when the outer diameter of the stator is constant, if the tooth width is increased, the slot area will decrease, and vice versa. Therefore, regardless of changing the tooth width of the motor or changing the slot area of ​​the motor, the torque density cannot be effectively improved. [0003] In 1986, Professor H. Weh of Braunschweig University of Technology in Germany proposed the structural idea of ​​the transverse magnetic field permanent ...

AI Technical Summary

Problems solved by technology

These advantages make the TFPM motor suitable for low speed, high torque, direct drive and other applications, and should be widely used. However, due to the structure of the transverse magnetic field permanent magnet motor and other factors, the magnetic flux leakage and pulsation of the transverse magnetic field permanent magnet motor are large. Large torque and complex production, these shortcomings make it have great limitations, seriously restricting the wide application and development of transverse magnetic field motors

A large number of researchers have demonstrated through theory and experiments that the magnetic flux leakage of the magnetic field is the main reason for the reduction of the power factor of the transverse magnetic field permanent magnet motor. For example, Professor Jiang Jianzhong of Shanghai University proposed a method to shield the magnetic flux leakage of the transverse reluctance motor, which can reduce the Flux leakage, but there is still a large flux leakage

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