Built-in alternate-pole hybrid excitation brushless motor using bilateral excitation

Abstract

The invention discloses a built-in alternate-pole hybrid excitation brushless motor using bilateral excitation. The motor comprises a rotor and a stator, wherein the rotor is a built-in alternate-polerotor; a plurality of groups of permanent magnet pole pairs are uniformly built in the rotor in the circumferential direction; the rotor cores between every two adjacent groups of permanent magnets pole pairs form a core pole; an excitation winding is wound around a side of a stator slot; the number of poles of the excitation winding is equal to the that of the core pole; an armature winding is wound around the other side of the stator slot; and the number of poles of the armature winding is equal to the sum of the number of poles of the permanent magnet pole and the number of poles of the core pole. By controlling the alternating current of the excitation winding, an excitation magnetic field that rotates synchronously with the rotor is generated to realize brushless excitation. The excitation winding is located on the stator. The permanent magnets are located on the rotor. The bilateral excitation significantly reduces the degree of geometric constraint, and increases the motor space and a material utilization rate. Since the permanent magnet poles are uniformly arranged in the circumferential direction based on the pole pairs, problems of unipolar magnetic flux leakage and magnetized mechanical components are avoided.

Description

technical field [0001] The invention relates to the field of motor design, in particular to a built-in alternating pole hybrid excitation brushless motor adopting bilateral excitation. Background technique [0002] Permanent magnet motors have the advantages of high torque density, high power density and high efficiency, and have been applied in many occasions. According to the position classification of permanent magnets, permanent magnet motors are divided into rotor permanent magnet motors and stator permanent magnet motors. Among them, the rotor permanent magnet motor can be divided into surface mount permanent magnet motor and built-in permanent magnet motor. Since the built-in permanent magnet motor is easy to obtain a large saliency ratio and reluctance torque component, it can obtain better constant power operation capability than the surface-mounted permanent magnet motor. However, permanent magnet motors are field weakened by applying a negative direct axis curre...

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Problems solved by technology

Therefore, there is no problem of unipolar flux leakage and mechanical parts being magnetized

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