Composite permanent-magnet invisible magnetic pole and brushless electromagnetic hybrid excitation driving motor

Abstract

The invention provides a composite permanent-magnet invisible magnetic pole and brushless electromagnetic hybrid excitation driving motor, and belongs to the technical field of a motor electrical device of an electric vehicle. The hybrid excitation driving motor comprises a front end cover, a rear end cover, an enclosure, a rotor and a stator, wherein rectangular permanent-magnet steel is separately embedded into a radial rectangular groove and an arc groove in a rotor iron core, the permanent-magnet steel can be effectively prevented from generating irreversible demagnetization under the effect of armature reaction of impact current and is enabled not to loss magnetism, a magnetic field in an air gap of a driving motor is jointly provided by the permanent-magnet and an electric excitation magnetic winding, the generated magnetic field directly faces the air gap, and less magnetic leakage is achieved.

Description

technical field [0001] The invention provides a composite permanent magnet invisible magnetic pole and brushless electromagnetic hybrid excitation drive motor, which belongs to the technical field of electric vehicle motors and appliances. Background technique [0002] At present, the rotors of the permanent magnet drive motors used in electric vehicles mostly 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 the rotor Iron core, rotating shaft and permanent magnet. The rotor iron core is composed of punched sheets and connected together. The rotating shaft and the rotor iron core are fixedly connected. There are even numbers of T-shaped wedges evenly distributed on the outer surface of the rotor iron core. Adjacent T-shaped wedges Slots are formed between the blocks, and the permanent magnets are correspondingl...

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Problems solved by technology

[0002] At present, the rotors of the permanent magnet drive motors used in electric vehicles mostly 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 the rotor Iron core, rotating shaft and permanent magnet. The rotor iron core is composed of punched sheets and connected together. The rotating shaft and the rotor iron core are fixedly connected. There are even numbers of T-shaped wedges evenly distributed on the outer surface of the rotor iron core. Adjacent T-shaped wedges Slots are formed between the blocks, 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 form irreversible demagnetization, The efficiency of the driving motor is reduced, and the power and torque drop rapidly, and its performance needs to be further improved

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