Application Classification of Brushless DC Motor
Because the brushless DC motor has a series of advantages such as simple structure, reliable operation and convenient maintenance, as well as high efficiency, no excitation loss and good speed performance of DC motor, it is increasingly popular in various fields of the national economy, such as medical equipment, instrumentation, chemical industry, textile and household appliances.
The application of brushless DC motor is mainly divided into the following categories:
1. Fixed speed drive machinery
In general industrial occasions, three-phase or single-phase AC asynchronous and synchronous motors are often used in most areas that do not require speed regulation. With the advancement of power electronics technology, in order to reduce the volume and save Under the condition of continuous operation of no more than 10kw, more and more motors are being replaced by brushless DC motors. Materials, improve efficiency and reduce losses, such applications include: automatic doors, elevators, water pumps, fans, etc. In the case of large power, due to the large cost and investment, in addition to the permanent magnet motor, it is necessary to increase the driver and other equipment, so the current less application of brushless motor.
2, Adjustable speed drive machinery
The speed needs to be set and adjusted arbitrarily, but the control accuracy is not high. These systems are divided into two types: one is an open-loop speed control system, and the other is a closed-loop speed control system (at this time, the speed feedback device mostly uses low-resolution pulse encoders or AC and DC speed measurement, etc.). There are three main types of motors commonly used: brush DC motors, asynchronous motors and brushless DC motors. This has a large number of applications in packaging machinery, food machinery, printing machinery, material handling machinery, textile machinery and transportation vehicles.
The application field of adjustable speed system is mostly DC motor. With the development of AC speed control technology, especially power electronic technology and controller, AC frequency conversion technology has been widely used. The frequency converter and AC motor have penetrated into most of the original DC speed control system application fields. In recent years, due to the advantages of small size, light weight, high efficiency and energy saving of brushless DC motor, small and medium power AC frequency conversion system is gradually replaced by brushless DC speed control system, especially in textile machinery, printing machinery and other fields where the original frequency conversion system is widely used. In some applications directly powered by the battery, now more use of DC brushless motor.
3. Precision control
Servo motor in the field of industrial automation in high precision control has been playing a very important role, the application of different, the servo motor control performance requirements are not the same, in the actual application, the servo motor of a variety of different control forms: torque control/current control, speed control, position control. Brushless DC motor because of good control performance, in high-speed, high-precision positioning system can gradually replace the DC motor and stepper motor, become one of the modern servo system choice of motor. At present, scanners, cameras, CD drive, medical diagnosis CT, computer hard disk drive and CNC lathe drive are widely used in brushless DC motor servo system for precision control.
4 Other applications
Household appliances such as automatic washing machines, CD players, etc.; military applications such as submarines, warships; as well as the start of large synchronous motors.
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