如何控制无刷直流电动机的功率

　　如何控制无刷直流电动机的功率

　　无刷直流电动机（BLDC）的日益普及是由于使用电子换向。这取代了传统的机械组成的刷子摩擦换向器上的直流电动机电枢绕组的活力。

　　电子换向提供了更高的效率比传统的直流电动机与20至30%的电机在相同的速度和负载运行的改进。正如国际能源机构报告说，全球40%的电力用于电力电动机，这种效率的提高成为引人注目。

　　Further， the BLDC motor is more durable. It retains its high performance while the efficiency and power of an equivalent conventional motor declines due to wear， causing poor brush contact， arcing between the brushes and the commutator dissipating energy， and dirt compromising electrical conductivity.

　　Greater efficiency allows BLDC motors to be made smaller， lighter and quieter for a given power output， further increasing their popularity in sectors such as automotive; white goods; and heating， ventilation and air conditioning （HVAC）。 Other advantages of BLDC motors include superior speed versus torque characteristics （with the exception of torque at start-up）， a more dynamic response， noiseless operation， and higher speed ranges.

　　The downside of BLDC motors is their complexity and the associated increase in cost. Electronic commutation demands supervisory circuits to ensure precise timing of coil energization for accurate speed and torque control， as well as ensuring the motor runs at peak efficiency.