With electric vehicles penetration is higher and higher, the market competition is fierce, many companies and businesses except in the make an issue of product price and appearance, also in electric vehicles are playing on the small details of advertising, which is the most for the motor with brush and brushless publicity, advertising and brushless motor is one of the highlights. When you see the word, you would have thought that without brush, it must have a brush, then where is the difference between brush and brushless is? Answers below small make up it for you.
1, brushless motor, coil and the commutator rotating, the magnetic steel and carbon brush don't turn, is the direction of the coil current changes with the motor rotation phase switcher and brush. In the electric car industry has a brush motor points high-speed brush and a brush motor at low speed. Brush motors and brushless motor, there are a lot of difference between can be seen from the name have carbon brush brush motor, brushless motor without carbon brush
2, brushless dc motor is composed of main body of the motor and drive, is a typical mechatronics product. Because of brushless dc motor based on self-control type operation, so don't like frequency control of motor speed synchronous motor overload start under plus startup winding on the rotor, also won't generate oscillation and step out when load mutation.
3, motor is a traditional product, the performance is stable.
brushless motor is to upgrade the product, its performance is better than a brush motor service life. But the control circuit is more complex, the aging of the components of screening more strict. Although the life is long but control circuit is easy to go wrong. So choose brushless motor should pass the strict reliability test to ensure quality. , but as the technology continuously upgrade steps, brushless motor technology already quite mature.
4, in the actual production process, due to the dc motor brush a tooth is a high-speed motor, gear tooth is small, easy to wear and tear, but strength is big, strong climbing ability. The brushless dc motor, saves in the process of using two or three years in exchange for carbon brush. But because in the process of controlling brushless motor, require high accuracy. Moreover, the price of the brushless motor controller is also higher. By contrast have no tooth brush dc motor, although to replace carbon brush, but to replace carbon brush is very easy, and motor control is simple, the motor smooth operation, high safety coefficient.
5 and there was brush motor is a dc input, controls the size of the controller only give it its current can speed; And brushless motor is actually a three-phase ac motor, controller to convert the dc to three-phase alternating current (ac), and according to the hall element sensor in the motor commutation make motor run properly. Direct, brushless motor brush than to have long life, strong start save electricity, but higher than brush controller cost controller. At present, now is brushless controller, a brush has been basically eliminated. Electric vehicle controller is used to control the electric motor is starting, running, and, the speed, stop, and other electronic devices at the core of the control device of electric cars, it's like the electric car of the brain, are important components of the electric vehicle.
