Brushless permanent magnet direct current motor for automobile

Abstract

The invention provides a brushless permanent magnet direct current motor for an automobile. The brushless permanent magnet direct current motor has a compact and reasonable structure. A controller has a good controlling effect, a rotor rotates in a predetermined direction, and high reliability is achieved. The brushless permanent magnet direct current motor comprises a stator, an outer rotor and an insulating system, and is characterized in that: the circular-arc top surface of a T-shaped toothed part of the stator is provided with a gap according to a magnetic path; and a rotating magnetic field is formed around the gap.

Description

technical field [0001] The invention relates to a brushless permanent magnet DC motor in electrical technology, in particular to a brushless permanent magnet DC motor for automobiles. Background technique [0002] At present, automotive fans use brushed DC motors with a power of 90W-800W. The structure of the motor includes a stator, a rotor with a commutator, and a brush holder assembly. The brush holder assembly also includes carbon brushes, springs, brush houses, In the vibration damping part, the commutator and the carbon brush have a complex structure and a large installation space, and the contact resistance between the commutator and the carbon brush of the brushed DC motor is large, which affects the reliability and life of the motor, and the efficiency is low. [0003] At present, brushless DC motors and brushless DC motors are used in the industry. They have good reliability and are suitable for automotive fans. In order to simplify the structure, Hall-free control...

AI Technical Summary

Problems solved by technology

[0002] At present, the fan for automobiles adopts a brushed DC motor with a power of 90W-800W. The structure of the motor includes a stator, a rotor with a commutator, and a brush holder assembly. The brush holder assembly includes carbon brushes, springs, brush houses, In the vibration reduction part, the structure of the commutator and the carbon brush is complex, and the installation space is large, and the contact resistance of the commutator and the carbon brush of the brushed DC motor is very large, which affects the reliability and life of the motor, and the efficiency is low

[0003] Now the industry adopts DC brushless motors. DC brushless motors have good reliability and are suitable for use in automotive fans. In order to simplify the structure, a Hall-free control method is usually used, but a motor without Hall control needs to be equipped with a controller, and The internal circuit of the controller is complicated, there are many contacts, and the reliability is difficult to guarantee. Moreover, when the controller controls the motor to rotate, it needs to be equipped with a special circuit for the initial rotation direction of the rotor, which also increases the complexity of the controller.

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