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    Introduction to brushless dc motor in the application of the auto industry
    2018/11/21 14:44:06

    With the development of industrial automation technology, today's manufacturing has all been transformed and upgraded. From most exhibits, we can see that intelligent automation pipeline and industrial robots have gradually matured and gradually applied to various intelligent equipment. However, in order to drive the operation of these devices, it is undoubtedly necessary to drive the linear DC brushless motor. Take the automobile as an example.

    1. Vehicle purifier adopts brushless DC motor.

    Most automobile purifiers adopt linear DC brushless motor to mobilize centrifugal blades to Eliminate Turbid atmosphere. The motor body is affirmed according to the electromechanical circuit plan, and is rarely used in the two-phase bridge commutation drive circuit. The internal stator winding can be conveniently wound around the dead tooth. The external rotor layout is made by electromechanical and stator and stator windings are placed outside the rotor. The commutation drive circuit adopts a common integrated circuit (ASIC), which is simple in circuit and has a moderate shielding effect.

    2, car air diverted brushless DC motor

    Developing low-voltage and high-current brushless DC motors for automobiles can deal with the problems of high noise, short service life and hard shielding of the original brushless DC motors, and improve the mechanical and electrical operation function. The additional voltage is 12V, which makes the plan of linear brushless DC motor more difficult because of the restriction of layout. The stator punch is 12 slots, and the diethylene diamond is a low voltage and high current type. In order to ensure the current density is not convergent too high, double-wire winding is adopted to reduce the diameter of the conductor. The rotor is a four-pole structure with external permanent magnet, and the permanent magnet is Nd-Fe-B, a rare earth permanent magnet material, because the residual magnetism and coercivity of Nd-Fe-B are very high, and the magnetization bias is high. Short. Radial tile is adopted for permanent magnet. Holzer element is chosen as position sensor. The magnetic field of the position sensor is an axial magnetic field outside the cover of the electromechanical terminal.

    3. Brushless DC motor for vehicle driving

    At present, the motor examples for vehicle driving can be divided into four categories: DC motor, switching motor, linear brushless DC motor, reluctance motor and so on. They stop evaluating the synthesizer and feel that brushless DC motor has a significant advantage. The four wheels of an electric vehicle are separated and driven indirectly by four self-powered wheeled motors. Inverters are adopted to stop electronic commutation, and machine commutators and brushes are removed. This kind of layout facilitates high-speed operation and does not affect the motor body when changing tires. The adoption of gear removal and indirectly driven external rotor motor is the most advanced plan in the world. However, because the plan of external rotor motor has indirect and close relationship with the wheel layout plan of the vehicle, many manufacturers basically choose the internal rotor brushless DC motor ports under the circumstances of low cost and tight time for developing prototype cars at home and abroad. In addition, the disc permanent magnet brushless winner motor can win the front wheel or rear wheel in the electric vehicle at low speed, thus eliminating the machine speed change assembly. It has the characteristics of compact axial layout, convenient assembly, low musical sound, reliable operation and stepless speed regulation. The air gap magnetic field is axial, the stator winding is composed of radial conductors. The rotor is composed of a fan-shaped permanent magnet with N shape, and the S melon is assembled in the disc yoke. The crux of this machine lies in the forming skill of the coil winding, which has complicated working procedure and long cycle. In order to improve production efficiency, it is possible to use thermosetting material instead of epoxy resin as insulation supplement material and adopt heating moulding technology.

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