Two-section Halbach permanent magnet motor with optimal magnetization angle

Abstract

The invention discloses a two-section Halbach permanent magnet motor with an optimal magnetization angle, which is characterized in that the optimal magnetization angle of a first permanent magnet section of the N-pole is an included angle of a magnetization direction and a clockwise circumference tangential direction; the optimal magnetization angle of a second permanent magnet section of the N-pole is an included angle between the magnetization direction and an anticlockwise circumference tangential direction; the optimal magnetization angle of a first permanent magnet section of the S-poleis an included angle between the magnetization direction and the anticlockwise circumference tangential direction; and the optimal magnetization angle of a second permanent magnet section of the S-pole is an included angle between the magnetization direction and the clockwise circumference tangential direction, and a rotor is matched with a corresponding stator to form a two-section Halbach permanent magnet motor with an optimal magnetization angle. The two-section Halbach permanent magnet motor can improve the radial air gap flux density fundamental wave amplitude and reduce a harmonic component of the air gap flux density, thereby being capable of outputting the torque at the same volume and cost. Therefore, the torque density and the power density of the kind of motors can be improved,and the scheme is also applicable to motor without a rotor core and external rotor motors.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a two-stage Halbach permanent magnet motor with an optimal magnetization angle. Background technique [0002] Permanent magnet motors have the advantages of high efficiency, small size, and high power density, and are widely used in aerospace, national defense, transportation, industrial and agricultural production, and public life. Permanent magnet motors are divided into surface-mounted and built-in permanent magnet motors according to the position of the permanent magnet of the rotor. The Halbach array permanent magnet motor belongs to the surface mount permanent magnet motor, which can be divided into two sections, three sections, four sections and up to n sections. Theoretically speaking, the more segments there are, the closer the radial air gap magnetic density is to a sine wave. However, the more the number of segments, the more complex the processing. ...

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Problems solved by technology

However, since the rotor has two sets of Halbach arrays, the structure of the motor is too complicated

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