After more than ten years of development, in order to meet the requirements of more applications, the traditional geared motor fan has been expanded to a permanent magnet motor fan. We all know that permanent magnet motors are divided into permanent magnet brushless motors and permanent magnet brushed motors, so what is the difference between them?Suzhou Aobaojie and everyone here for comparative analysis.
1. Permanent magnet brush motor.
The brush of the permanent magnet brush motor is mainly composed of a stator and a rotor, carbon brushes and other parts, the stator has a magnetic pole, and the rotor has windings, and the rotating torque is obtained by rotating the magnetic field, so as to output kinetic energy. The brushes are in constant contact with the commutator and play a role in conduction and commutation during rotation. After being energized, a magnetic field is formed on the rotor, and there is an angle between the stator and the magnetic poles of the rotor, which makes the motor rotate under the mutual attraction of the magnetic fields of the stator and rotor. By changing the position of the brushes, you can change the direction of the angle between the magnetic poles of the stator and rotor, and thus the direction of rotation of the motor.
The brush motor is mechanically commutated, the magnetic pole does not move, and the coil rotates. When the motor is working, the coil and commutator rotate, the magnet and the carbon brush do not rotate, and the alternating change of the coil current direction is completed by the commutator and brush that rotate with the motor. Slipping against each other, it will rub against the carbon brushes, causing wear and tear, and the carbon brushes need to be replaced regularlyThe alternation between the carbon brush and the coil terminal will cause electric sparks and electromagnetic breaks, which can easily interfere with electronic equipment.
2. Industrial large fan permanent magnet brushless motor.
The permanent magnet brushless motor used in the industrial large fan is mainly composed of parts such as stator and rotor, without carbon brushes, and the brushless motor adopts electronic commutation, the coil does not move, and the magnetic pole rotates. The position of the poles of the permanent magnet is sensed by the Hall element or back EMF detection method, and according to this perception, the direction of the current in the coil is switched at the right time using an electronic circuit to ensure that the magnetic force in the correct direction is generated to drive the motor.
The brushless motor removes the brush, and the most direct change is that there is no electric spark generated when the brush motor is running, which greatly reduces the interference of electric sparks on radio equipment. Without brushes, the friction is reduced, the operation is smooth, and the noise will be much lower, which is a huge support for the stability of operation. And without brushes, the wear of brushless motors is mainly on the bearings, and from a mechanical point of view, brushless motors are almost a maintenance-free motor.
Permanent magnet brushless motor is a technological advancement in the field of electronic technology development. Due to the high-altitude installation and long-term use, the application requires the drive motor to have the characteristics of light weight, high efficiency, reliability, safety and low noise, and there is no doubt that the permanent magnet brushless motor has obvious advantages over the traditional reducer induction motor industrial ceiling fan, and the permanent magnet brushless motor is more suitable for use in the industrial large fan.