Production method of radial permanent magnet and brushless electromagnetic hybrid excitation generator rotor

Abstract

The invention provides a method of producing a radial permanent magnet and brushless electromagnetism mixed excitation generator rotor, and belongs to the technical field of automobile motors and electric appliances. The method comprises the steps of production of a permanent magnet rotor, production of an electromagnetic excitation rotor and rotor assembly. Each N pole and each S pole of the permanent magnet rotor are respectively formed by two pieces of rectangular permanent magnet steel so that the internal spline effect can be weakened, and starting resisting moment can be reduced. The electromagnetic excitation rotor is of a brushless claw pole structure, so that the failure rate is low. A magnetic field in a generator air gap is provided by both the permanent magnet steel and an electromagnetic excitation coil, and therefore the magnetic field formed after a permanent magnetic field and an electromagnetic excitation magnetic field are in superposition can be adjusted through adjustment of the magnitude and the direction of a current existing when the electromagnetic excitation coil is powered on. The output voltage of a generator is kept stable under the working conditions of a variable speed and a variable load, and therefore the safety and the use reliability of automobile electric equipment are guaranteed.

Description

technical field [0001] The invention provides a method for producing a radial permanent magnet and brushless electromagnetic hybrid excitation generator rotor, which belongs to the technical field of automobile motors and electrical appliances. Background technique [0002] At present, the production method of the permanent magnet generator rotor used in automobiles is to assemble the shaft and a full cylindrical permanent magnet, and then magnetize the cylindrical permanent magnet in a radial direction to form a permanent magnet with N poles and S poles arranged at intervals. For the magnetic rotor, during the magnetization process, the magnetic molecules cannot be completely arranged in an orderly manner, and the residual magnetic induction intensity is low, and because a part of the permanent magnet material between the magnetic poles of the entire cylindrical permanent magnet does not work, the permanent magnet of the rotor with this structure The material utilization ra...

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Problems solved by technology

[0002] At present, the production method of the permanent magnet generator rotor used in automobiles is to assemble the shaft and a full cylindrical permanent magnet, and then magnetize the cylindrical permanent magnet in the radial direction to form a permanent magnet with N poles and S poles arranged at intervals. For the magnetic rotor, during the magnetization process, the magnetic molecules cannot be completely arranged in an orderly manner, the residual magnetic induction intensity is low, and because a part of the permanent magnetic material between the magnetic poles of the entire cylindrical permanent magnet does not work, the permanent magnet of the rotor with this structure The material utilization rate is low, and because the permanent magnetic field is a constant magnetic field, the magnetic field cannot be adjusted, the output voltage is low at low speed, the output voltage is high at high speed, and the output voltage is unstable, resulting in damage to the electrical equipment of the car or shortening the service life. Performance needs to be further improved

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