免维护高力矩无刷变频电机直接驱动，启动力矩大、加速时间短。
Maintenance-free brushless drive motor with frequency inversion, has high start torque and short acceleration time.
然后分析研究无位置传感器无刷直流电机控制系统的几项关键技术：转子位置检测、启动和PWM控制技术等。
And then it studies a number of key technologies around the sensor less brushless DC motor control system: Rotor position detection, motor starting and the PWM control technology.
理论分析和实验表明：提出的方法与霍尔传感器一样能保证无刷直流电机快速大转矩、小抖动、无堵转的平滑启动。
Theoretical analysis and experimental results show that the method has the effect as same as Hall sensor in the event that ensure the DC motor start-up quickly and microseism, and no locked rotor.
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