Production method of drive motor rotor embedded with rare-earth permanent magnet steel for electric automobile

Abstract

The invention provides a production method of a drive motor rotor embedded with rare-earth permanent magnet steel for an electric automobile, and belongs to the technical field of electric automobile motors and electric appliances. Rectangular permanent magnet steel is embedded into rectangular radial slots and rectangular tangential slots of a rotor core respectively; a magnetic field of the drive motor rotor is provided by three pieces of permanent magnet steel; the magnetic field is high in strength; the power density is high; and the structure is a rotor flux bypass structure. The problem that the permanent magnet steel generates irreversible demagnetization under the effect of armature reaction of an impulse current can be effectively solved; the condition that the permanent magnet steel is not demagnetized is ensured; an electrical exciting winding is avoided; electric energy consumption is low; a carbon brush or a mechanical commutator is avoided; the fault rate is low; and the drive motor rotor has the characteristics of being compact in structure, reliable to work and the like.

Description

technical field [0001] The invention provides a production method for a drive motor rotor embedded with rare earth permanent magnet steel 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 embedded in the s...

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

Images