Core-free permanent magnet direct current motor with axial magnetic field for electric vehicle

Abstract

The invention discloses a core-free permanent magnet direct current motor with an axial magnetic field for an electric vehicle. The motor comprises permanent magnets, magnetic conduction yokes, a bearing, a shaft core and a hub. A core-free inner stator is arranged coaxially on the shaft core. The two sides of the inner stator are coaxially provided with a rotor on which an even number of permanent magnets are uniformly distributed respectively. The inner edges of the rotors are connected with the magnetic conduction yokes on the two sides of the motor respectively, and are arranged together with the shaft core of the motor by the bearing. The outer edges of the rotors are connected together with the hub of the motor by the magnetic conduction yokes. The two sides of the stator are provided with the rotor respectively, a core and a toothed groove are not required, the dual rotors and the single stator form dual air gaps, and the magnetic field is axial. The efficiency of the motor is improved, effective metal materials are saved, the life mileage of the motor is increased, the climbing capability of the motor is improved and the battery replacement cycle of the electric vehicle is prolonged; and the motor is particularly suitable for use as a driving motor for the electric vehicle.

Description

technical field [0001] The invention relates to an ironless, axial magnetic field permanent magnet DC motor for an electric vehicle. Background technique [0002] Conventional motors for electric vehicles generally have only one stator and one rotor. The stator is made of electromagnetic wires wound in the groove of the silicon steel sheet and connected to the mandrel through an iron bracket. The rotor is fixed on the inner edge of the motor shell by a rectangular permanent magnet to form a magnetic field. is the radial direction, and the air gap is a single air gap. The shell is connected to the mandrel through bearings. [0003] When the motor is running, due to the existence of the iron core made of silicon steel sheets, the electromagnetic torque will pulsate due to the cogging effect, and the moment of inertia is large, the speed response is slow, especially iron loss is inevitable, and there are many electromagnetic wires used , the copper loss is also large, so the ...

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Problems solved by technology

[0003] When the motor is running, due to the existence of the iron core made of silicon steel sheets, the electromagnetic torque will pulsate due to the cogging effect, and the moment of inertia is large, the speed response is slow, especially iron loss is inevitable, and there are many electromagnetic wires used , the copper loss is also large, so the efficiency of the motor is restricted

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