Brushless dc motor as a kind of synchronous motor, has both ac motor has simple structure, reliable operation, convenient maintenance and so on a series of advantages, and dc motor running with high efficiency, speed control performance is good, and many other advantages. Brushless dc motor is the most important part of the control of its structure, its driver can control the rotor to maintain at a certain speed, more stable performance. As the brushless motor production design and the control level of ascension, it is more widely used in various fields. Big to aerospace mechanical arm control, gyroscope and steering gear drive, or oil pump in the field of automotive industry control, electric controller, engine control production equipment, instruments and meters, etc. Small to vacuum cleaner, mixer, electric hair dryer in daily life, cameras and household electric fans and other household electrical appliances, or digital camera, laser printers, photocopiers, fax machines, tape recorders, LD drive DVD and shredders and other office equipment, can see the figure of brushless motor. And has attracted much attention in recent years, vehicle applications -—droneThe success of the uav aerial system spread to ordinary families, people began to more and more attention to this emerging industry. So what are the brushless dc motor performance advantages? The first advantage of the brushless motor is high efficiency. Because brushless motor can rotate force (in its biggestTorque)Under continuous rotation. Compared with them, there are only in some point of the rotating brush motor provides maximum torque. Despite the brush motor can provide the same torque as the brushless motor, but there is need greater magnetic brush motor, which means that the smaller size of the brushless motor can provide considerable power. The general efficiency of the brushless dc motor can reach more than %, and the efficiency of the traditional dc motor is in commonly % around; High efficiency lead to high energy conversion, the electrical energy is converted into motor rotating mechanical energy is high, direct expression is energy saving, energy saving % - than traditional motor%, if it is a long running motor, brushless dc motor using a year can save electricity costs by an electric motor, the long-term use of higher cost performance, although the brushless dc motor start when buying price higher than conventional motor, energy-saving effect is very obvious. Brushless motor is another big advantage is that life is long, generally have a tradition of brush motor, because of the wear of carbon brush, after a period of time has to be replaced, frequent maintenance, and brushless dc motor, the service life of the thousands of hours or more commonly, under normal working conditions, using years, basic not damaged, so the life of the brushless dc motor is times of traditional motor. Brushless motor running low noise: brushless dc motor because of its simple structure, parts precision fitted to install, run more smooth and sound under the db operation, many of the medical equipment for silent performance of brushless dc motor adopts brushless dc motor. Need to replace the traditional motor carbon brush, cannot do sealing, carbon brush wear and friction caused by noise, the noise in the db above, cannot satisfy the requirement of need Gao Jingyin equipment. Brushless motor without brush can provide high durability. For a brush motor, the brush and commutator, due to the movement of the continuous contact wear and may produce a spark in the contact. Especially the spark gap in the brush through commutator usually produce, strong spark can cause electrical noise. If the motor electrical noise factors in the design, brushless motor is preferable. No sliding contact also solved the problem of the commutation spark, make its can be used in explosive environment.
