The advantages of BLDC motor
1. Small loss, high efficiency
Because of the use of permanent magnet excitation, eliminate the loss caused by the induction motor excitation current; At the same time, the permanent magnet brushless DC motor works in synchronous operation mode, which eliminates the frequency loss of the rotor core of the induction motor. These two aspects make the operation efficiency of the permanent magnet brushless DC motor much higher than the induction motor, and the efficiency of the small capacity motor is improved more obviously.
2. High power factor
Because the excitation field of the brushless DC motor does not need the reactive current of the grid, its power factor is much higher than that of the induction motor. The brushless DC motor can operate at 1 power factor, which is very beneficial to the small power motor. Compared with an induction motor, a brushless motor not only has higher efficiency and power factor at rated load, but also has more advantages at light load.
3. Good speed regulation performance and simple control
Compared with frequency conversion speed regulation of induction motor, the speed control of brushless DC motor is not only simple, but also has better speed regulation performance.
4. Inverter capacity is low, so the inverter cost is low
Brushless DC motors require a rectangular wave current, and the current rating for continuous operation of the inverter refers to the peak of this rectangular wave. Induction motors need sinusoidal current. The current rating when the inverter is running continuously generally refers to the effective value of this sinusoidal wave. In order to maintain the inverter's ability to control the motor current, there should be enough difference between the inverter DC voltage and the motor induced electromotive force.
