Production method for rotor of permanent magnet driving motor with built-in tangential and combined type radial magnetic fields

Abstract

The invention provides a production method for rotor of a permanent magnet driving motor with built-in tangential and combined type radial magnetic fields, and belongs to the technical field of motors and electric appliances of electric automobiles. Rectangular permanent magnet steels are embedded in corresponding first rectangular grooves and second rectangular grooves of the rotor iron core respectively; the magnetic field of each magnetic pole of the rotor of the driving motor is jointly supplied by four permanent magnet steels separately, so that high magnetic field strength and high power density are realized; the structure is a rotor magnetic bypass structure, so that the irreversible demagnetizing of the permanent magnet steels generated under an armature reaction of the impact current can be effectively prevented so as to ensure that the permanent magnet steels are not demagnetized; and in addition, the driving motor has the advantages of high efficiency and high reliability.

Description

technical field [0001] The invention provides a method for producing a rotor of an embedded tangential and combined radial magnetic field permanent magnet drive motor, which belongs to the technical field of electric vehicle motors. 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. T...

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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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