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(1) Low loss and high efficiency
Because the permanent magnet excitation is adopted, the loss caused by excitation current of the induction motor is eliminated, and the permanent Magnet brushless DC motor works in synchronous operation mode, which eliminates the rotor core's rotary frequency loss. In these two aspects, the operation efficiency of PM brushless DC motor is much higher than that of induction motor, and the efficiency of small-capacity motor is increased more obviously.
(2) high power factor
Because brushless DC motor excitation magnetic field does not need the power grid reactive current, so its power factor is far higher than the induction motor, brushless DC motor can run in 1 power factor, which is very advantageous to small power motor. Compared with the induction motor, the brushless motor has higher efficiency and power factor than the rated load, and has more advantages in light load.
(3) Good speed regulation and simple control
Compared with the frequency conversion of induction motor, the speed control of brushless DC motor is not only simple, but also has better speed regulation performance.
(4) Low inverter capacity, so the inverter cost low
The brushless DC motor needs the rectangular wave current, the current rating of the inverter is the peak of the rectangular wave. The inductive motor needs sine wave current, and the current rating of the inverter is generally referred to as the valid value of the sine wave. In order to keep the inverter's control over the motor current, there should be enough difference between the DC voltage of the inverter and the induction electromotive force of motor. Therefore, the peak value of the brushless DC motor trapezoidal-wave induction electromotive force and the sinusoidal wave induction motor can be limited by the DC voltage of the inverter. In this case, if the brushless DC motor and induction motor current peak equal, then the former power output is higher than the latter 33%, that is to say, the same rectifier/inverter can be driven than the induction motor output power of 33% of the brushless DC motor.