Method for producing built-in biradial permanent magnet steel resultant magnetic field driving motor rotor

Abstract

The invention provides a method for producing a built-in biradial permanent magnet steel resultant magnetic field driving motor rotor and belongs to the technical field of electric automobile motors and electric equipment.Rectangular permanent magnet steel is embedded in a first rectangular groove and a second rectangular groove of a rotor core.A rotor magnetic bypass structure is adopted, irreversible demagnetization of permanent magnet steel caused under the armature reaction of impulse current can be effectively prevented, and loss of excitation of permanent magnet steel is avoided; meanwhile, the magnetic field of the driving motor rotor is provided by biradial permanent magnet steel, magnetic field intensity is high, output power is high, and the driving motor rotor has the advantages of being high in efficiency, high in power density, compact in structure, reliable in work and the like.

Description

technical field [0001] The invention provides a production method for a motor rotor driven by a built-in double radial permanent magnet steel synthetic magnetic field, 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 embedded in...

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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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