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Permanent magnet brushless DC motor with the power electronics and the development of high-performance permanent magnetic materials , and the rapid development of new models widely used , it is not only traditional DC motor speed characteristics, but also has a simple structure , reliable operation , easy to control , maintaining the advantages of convenience and long life . Its application from the initial military industry , the rapid development of the aerospace , medical , information, and industrial automation field . Due to the inherent characteristics of the brushless DC motor , the conventional control method must be equipped with a position sensor , due to the presence of the position sensor , so that the motor structure complicated , affecting the reliability and increases the cost and the complexity of the industrial environment is not easy to use position sensors. Therefore, the study of position sensorless brushless DC motor speed control system is particularly important . Subject sensorless permanent magnet brushless DC motor controller designed in the premise to ensure and further improve the control precision and performance , with a relatively low cost , excellent performance microcontroller as the control core , through the drive inverter circuit The precise control of the motor speed range . The motor does not turn to pass opposite the potential of detecting , by the voltage comparator to complete avoids directly through the A / D conversion to complete , improved microcontroller execution speed ; order to ensure the operation of the system security , real-time monitoring circuit of the current , once the work current exceeds the rated motor current , the system alarm and turn off the inverter circuit . To intuitive system uses liquid crystal display module , steering motor speed and current information can be displayed in real time . The actual debugging the system through the control effect is good , can satisfy the requirements of the company and the market .
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