Electromagnetic hybrid type excitation driving motor with permanent magnet invisible magnetic poles and salient poles

Abstract

The invention provides an electromagnetic hybrid type excitation driving motor with permanent magnet invisible magnetic poles and salient poles, and belongs to the technical field of motors and electric appliances of electric automobiles. The electromagnetic hybrid type excitation driving motor comprises a front end cover, a back end cover, a machine case, a rotor and a stator, wherein rectangular permanent magnet steels are embedded in corresponding first rectangular grooves and second rectangular grooves embedded in the rotor iron core respectively. 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 the magnetic field in the air gap of the driving motor is jointly supplied by the permanent magnet steels and the electric exciting winding; and meanwhile, the generated magnetic field directly faces to the air gap, so that the leakage flux is low in amount.

Description

Technical field [0001] The invention provides a permanent magnet invisible magnetic pole and salient pole electromagnetic hybrid excitation drive motor, which belongs to the technical field of electric automobile motors and appliances. Background technique [0002] At present, the rotors of permanent magnet drive motors used in electric vehicles are mostly embedded with permanent magnets, such as the prior art, patent name: brushless DC motor rotor, patent number: ZL200920116549.1, the following technical solutions are disclosed, including the rotor Iron core, rotating shaft and permanent magnet. The rotor core is composed of punching pieces and connected together. The rotating shaft is fixedly connected with the rotor core. The outer surface of the rotor core is evenly distributed with even number of T-shaped wedges, adjacent to the T-shaped wedges. A slot is formed between the blocks, and the permanent magnet is correspondingly embedded in the slot. The permanent magnet of the ...

AI Technical Summary

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

Images