Production method of double radial permanent magnet steel rotor embedded in hub drive motor

Abstract

The invention provides a method for producing an embedded dual radial permanent magnet steel rotor for a wheel hub drive motor, which belongs to the technical field of electric vehicles for electric vehicles. The rectangular permanent magnet steel is embedded in a first rectangular slot and a second rectangular slot of a rotor iron core respectively , The structure is a rotor magnetic bypass structure, which can effectively prevent the irreversible demagnetization of the permanent magnet steel under the action of the armature reaction of the impulse current, and ensure that the permanent magnet steel does not lose its magnetism. Provided together, the magnetic field strength is large, the output power is high, and it has the characteristics of high efficiency, compact structure and reliable operation.

Description

technical field [0001] The invention provides a method for producing a double-radial permanent magnet steel rotor embedded in a hub drive motor, which 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 embedded in the slots. The perma...

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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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