Advantages of DC cooling fan

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Advantages of DC cooling fan

Low inverter cost and low inverter capacity

The current at which the inverter continues to operate, the rated value requires a square wave peak value, the induction motor requires a sine wave current, and the DC cooling fan requires a square wave current. The current rating when the inverter continues to operate generally refers to the effective value of this sine wave. In order for the inverter to maintain its ability to control the motor current, there must be a sufficient difference between the DC voltage of the inverter and the induced electromotive force of the motor. In this case, if the DC motor and induction motor have the same peak current, the output of the former is 33% higher than the latter, and the same rectifier / inverter is the induction motor. 33% brushless DC motor

2, high power factor

Since the excitation field of a DC motor does not require a grid reactive current, its power factor is much higher than that of an induction motor. DC motors can operate at power factor and are very beneficial for low power motors. Compared to induction motors, motors not only have higher efficiency and power factor at rated loads, but also have advantages at light loads.

3, low loss and high efficiency

Since there is no loss due to the excitation current of the induction motor and permanent magnet excitation is adopted, the permanent magnet DC motor operates in the synchronous operation mode. Elimination of lateral loss of induction motor rotor core. These two aspects make the operating efficiency of the permanent magnet DC motor much higher than that of the induction motor, and the efficiency of the small capacity motor is more obvious.

4, good speed control, simple control

The speed control of the DC fan is not only simple compared to the frequency control of the induction motor, but also has excellent speed performance.