Production method of electric automobile embedded tangential magnetic field permanent magnet steel driving motor rotor

Abstract

The invention provides a production method and an electric automobile embedded tangential magnetic field permanent magnet steel driving motor rotor and belongs to the technical field of electric automobile motor devices. Rectangular permanent magnet steel is embedded in rectangular radial slots of a rotor iron core. The magnetic field of each magnetic pole of a driving motor rotor is provided by the two pieces of permanent magnet steel together, the magnetic field intensity is large, and the power density is high; the structure is a rotor magnetic bypass structure, so that permanent magnet steel is effectively prevented against irreversible demagnetization under the effect of an armature reaction of an impact current, and the permanent magnet steel is prevented against excitation loss; in addition, electric exciting windings are not needed, less electric energy is consumed, no carbon brush slip ring structures are arranged, the failure rate is low, the structure is compact, and the working is reliable.

Description

technical field [0001] The invention provides a production method of a permanent magnet steel drive motor rotor embedded with a tangential magnetic field in an electric vehicle, and belongs to the technical field of electric vehicle motors and appliances. Background technique [0002] At present, most of the production methods of permanent magnet drive motor rotors used in electric vehicles adopt the permanent magnet external embedded structure, such as the existing technology, patent name: brushless DC motor rotor, patent number: ZL200920116549.1, discloses the following technical solutions, Including rotor core, rotating shaft and permanent magnet, the rotor core is composed of punched sheets and connected into one, the rotating shaft is fixedly connected with the rotor core, the outer surface of the rotor core is evenly distributed with an even number of T-shaped wedges, adjacent T Slots are formed between the shaped wedges, and the permanent magnets are correspondingly e...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the production methods of permanent magnet drive motor rotors used in electric vehicles adopt the permanent magnet external embedded structure, such as the existing technology, patent name: brushless DC motor rotor, patent number: ZL200920116549.1, discloses the following technical solutions, Including rotor core, rotating shaft and permanent magnet, the rotor core is composed of punched sheets and connected into one, the rotating shaft is fixedly connected with the rotor core, the outer surface of the rotor core is evenly distributed with an even number of T-shaped wedges, adjacent T Slots are formed between the shaped wedges, and the permanent magnets are correspondingly embedded in the slots. The permanent magnets of the rotor with this structure directly face the air gap. Under the action of the armature reaction of the impact current, irreversible demagnetization may occur. Once the permanent magnets are formed irreversible Demagnetization, the efficiency of the drive motor decreases, the power and torque drop rapidly, and its performance needs to be further improved

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