Permanent magnet brushless motor sensorless starting method
A permanent magnet brushless motor and sensor technology, applied in motor control, electronic commutation motor control, electrical components, etc., can solve the problems of start-up failure, large amount of calculation, and high requirements for control chip calculation performance, and achieve fast start-up speed, Wide range of applications and the effect of improving the success rate of startup
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[0029] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention is further described by taking a two-pole motor as an example, combined with specific diagrams.
[0030] The first step of the present invention is rotor pre-positioning:
[0031] According to the two-by-two energization method, the rotor is to be positioned at figure 1 (a) The position shown in (a) needs to conduct the A-C phase (A-C means that the current flows from the A phase to the C phase), but if the rotor happens to be at the figure 1 In the position shown in (b), turning on phase A-C cannot make the rotor locate at figure 1 (a) shows the location, in order to prevent figure 1 (b) When the situation shown in (b) occurs, the pre-positioning stage adopts the method of turning on phase A-B first and then turning on phase A-C. The time for turning on phase A-B can be shorter, as long as the rotor is moving, the time...
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