What is a brushless dc motor reversing one of the most effective method
compared with the traditional have a brush motor, brushless dc motor has a great advantage. The motor efficiency is usually 15 - can be improved 20%; There is no brush physical abrasion, and thus can reduce the maintenance; No matter under what rated speed can get flat torque curve. Although the brushless dc motor is not a new invention, but due to complex control and feedback circuit, so widely used progress is relatively slow. However, due to the recent development of semiconductor technology, improving quality, permanent magnet and growing demand for higher efficiency, prompted the brushless dc motor in a large number of applications to replace the brush. Brushless dc planetary gear motor found market positioning in many industries, including white goods, automotive, aerospace, consumer, medical, industrial automatic equipment and instruments and meters, etc.
as the industry towards the need to use in more applications in the direction of the brushless dc motor development, many engineers will have to look to the technology. Although the basis of the electric machine design elements still apply, but adding external control circuit also increased the other a series of design considerations should be considered. In many design problems, the most important thing is how to obtain the motor commutation feedback.
before exploring brushless dc motor feedback option, to understand why they are needed is crucial. Brushless dc motor can be configured to single phase and two phase and three phase; One of the most commonly used configuration for three phase. Phase number match the number of stator winding and rotor magnetic pole number according to the different application requirements can be any number. Because of brushless dc motor rotor affected by the rotation of the stator poles, so must track the stator magnetic pole position, to effectively drive the three phase motor. Therefore, need to use motor controller in three phase generated on the six steps commutation mode. The six step ( Or reverse phase) Moving electromagnetic field, thus making rotor permanent magnet motor shaft.
by adopting the standard motor commutation sequence, the motor controller can use high frequency pulse width modulation ( 脉宽调制) The average voltage signal, effectively reduce the motor, so as to change the motor speed. In addition, this setting by a voltage source is used for all kinds of motor, greatly improved the design flexibility, even if the rated voltage of the dc voltage source is greatly higher than that of motor is no exception. In order to keep the system relative to the brush efficiency advantages, between the motor and the controller needs to be installed very strict control circuit. The importance of feedback technology is embodied in here; Controller to maintain precise control of motor, it must always be to master the exact position of the stator relative to the rotor. Expectations and actual location any non alignment or phase shift may cause unexpected situation and performance degradation. For brushless dc motor reversing can adopt many ways to achieve this feedback, but the most common way is to use a hall effect sensor, encoder, or rotating transformer. In addition, some applications will also depend on sensorless commutation technology to realize the feedback.
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