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The difference between brush motor and brushless motor
2021-07-01 09:39:44
Definition of brush motor and brushless motor
Brush motor: a brush motor is a rotating motor which contains brush device and converts electrical energy into mechanical energy (motor) or mechanical energy into electrical energy (generator). Brush motor is the basis of all motors, it has the characteristics of fast start, timely braking, smooth speed regulation in a wide range, relatively simple control circuit and so on.
Brushless motor: brushless DC motor is a typical mechatronics product, which is composed of motor body and driver. Because the brushless DC motor is operated by self-control, it will not add another starting winding on the rotor like the synchronous motor with heavy load starting under variable frequency speed regulation, and it will not produce oscillation and out of step when the load changes suddenly. At present, the permanent magnet of medium and small capacity brushless DC motor mostly uses Nd-Fe-B material with high magnetic energy product. Therefore, the volume of rare earth permanent magnet brushless motor is one frame number smaller than that of three-phase asynchronous motor with the same capacity.
Brush motor: a brush motor is a rotating motor which contains brush device and converts electrical energy into mechanical energy (motor) or mechanical energy into electrical energy (generator). Brush motor is the basis of all motors, it has the characteristics of fast start, timely braking, smooth speed regulation in a wide range, relatively simple control circuit and so on.
Brushless motor: brushless DC motor is a typical mechatronics product, which is composed of motor body and driver. Because the brushless DC motor is operated by self-control, it will not add another starting winding on the rotor like the synchronous motor with heavy load starting under variable frequency speed regulation, and it will not produce oscillation and out of step when the load changes suddenly. At present, the permanent magnet of medium and small capacity brushless DC motor mostly uses Nd-Fe-B material with high magnetic energy product. Therefore, the volume of rare earth permanent magnet brushless motor is one frame number smaller than that of three-phase asynchronous motor with the same capacity.
The difference between the two
1. When the brush motor works, the coil and the commutator rotate, but the magnet and the carbon brush do not rotate. The alternating change of the coil current direction is completed with the motor's rotating commutator and brush. In the electric vehicle industry, brush motor is divided into high-speed brush motor and low-speed brush motor. There are many differences between brush motor and brushless motor. It can be seen from the name that brush motor has carbon brush and brushless motor has no carbon brush
2. Brushless DC motor is a typical mechatronics product, which is composed of motor body and driver. Because the brushless DC motor is operated by self-control, it will not add another starting winding on the rotor like the synchronous motor with heavy load starting under variable frequency speed regulation, and it will not produce oscillation and out of step when the load changes suddenly.
1. When the brush motor works, the coil and the commutator rotate, but the magnet and the carbon brush do not rotate. The alternating change of the coil current direction is completed with the motor's rotating commutator and brush. In the electric vehicle industry, brush motor is divided into high-speed brush motor and low-speed brush motor. There are many differences between brush motor and brushless motor. It can be seen from the name that brush motor has carbon brush and brushless motor has no carbon brush
2. Brushless DC motor is a typical mechatronics product, which is composed of motor body and driver. Because the brushless DC motor is operated by self-control, it will not add another starting winding on the rotor like the synchronous motor with heavy load starting under variable frequency speed regulation, and it will not produce oscillation and out of step when the load changes suddenly.
3. Brush motor is a traditional product with stable performance.
Brushless motor is an upgraded product, and its life performance is better than that of brushless motor. But the control circuit is complex, and the requirement of aging screening is strict. Although the motor life is long, but the control circuit is easy to go wrong. Therefore, the selection of brushless motor should go through strict reliability test to ensure the quality., However, with the continuous upgrading of technology, brushless motor technology has been quite mature.
4. In the actual production process, because the brush toothed DC motor is a high-speed motor, the teeth of the gear are very small and easy to wear, but the force is large and the climbing ability is strong. The brushless DC motor, in the process of using, saves two or three years to replace the carbon brush trouble. However, in the process of controlling brushless motor, high precision is required. Moreover, the price of brushless motor controller is also higher. In contrast, the brush toothless DC motor, although to replace the carbon brush, but replace the carbon brush is very easy, and the motor control is relatively simple, the motor runs smoothly, high safety factor.
5. Brush motor means that the motor is a direct current input, and its controller can adjust speed only by providing it with large or small current; The brushless motor is actually a three-phase AC motor. The controller converts the DC into three-phase AC, and according to the sensor Hall element in the motor, the motor can operate normally. Directly speaking, the brushless motor has longer life, stronger start and less power than the brush motor, but the cost of the controller is higher than the brush controller. At present, the current brushless controller, brush has been basically eliminated. Electric vehicle controller is used to control the start, operation, advance and retreat, speed, stop and other electronic devices of electric vehicle. It is like the brain of electric vehicle and an important part of electric vehicle.
4. In the actual production process, because the brush toothed DC motor is a high-speed motor, the teeth of the gear are very small and easy to wear, but the force is large and the climbing ability is strong. The brushless DC motor, in the process of using, saves two or three years to replace the carbon brush trouble. However, in the process of controlling brushless motor, high precision is required. Moreover, the price of brushless motor controller is also higher. In contrast, the brush toothless DC motor, although to replace the carbon brush, but replace the carbon brush is very easy, and the motor control is relatively simple, the motor runs smoothly, high safety factor.
5. Brush motor means that the motor is a direct current input, and its controller can adjust speed only by providing it with large or small current; The brushless motor is actually a three-phase AC motor. The controller converts the DC into three-phase AC, and according to the sensor Hall element in the motor, the motor can operate normally. Directly speaking, the brushless motor has longer life, stronger start and less power than the brush motor, but the cost of the controller is higher than the brush controller. At present, the current brushless controller, brush has been basically eliminated. Electric vehicle controller is used to control the start, operation, advance and retreat, speed, stop and other electronic devices of electric vehicle. It is like the brain of electric vehicle and an important part of electric vehicle.