Tell me about the advantages and performance of DC cooling fans?
2020-07-25
Advantages of DC cooling fan:
1. The inverter has low cost and low capacity
When the inverter continues to run, the rated value refers to the peak value of the rectangular wave. Induction motors need sine wave currents, and DC motors need rectangular wave currents. The current rating when the inverter continues to run generally refers to the effective value of this sine wave. In order to maintain the inverter's ability to control the motor current, there should be a sufficient difference between the inverter's DC voltage and the motor's induced electromotive force. In this case, if it is assumed that the peak currents of the DC motor and the induction motor are equal, the power output of the former is 33% higher than that of the latter, that is to say, the same rectifier/inverter can drive higher output power than the induction motor 33% brushless DC motor.
2. High power factor
Its power factor is much higher than that of induction motors, because the excitation field of DC motors does not require reactive current from the grid. DC motors can run at 1 power factor, which is extremely beneficial for small power motors. Compared with induction motors, motors not only have higher efficiency and power factor at rated load, but also have advantages at light loads.
3. Low loss and high efficiency
The loss caused by the excitation current of the induction motor is eliminated, and the permanent magnet DC motor works in a synchronous operation mode because of the use of permanent magnet excitation. The frequency loss of the rotor core of the induction motor is eliminated. These two aspects make the operating efficiency of permanent magnet DC motors far higher than induction motors, and the efficiency of small-capacity motors is more obvious.
4. Good speed regulation performance and simple control
The speed control of the DC fan is not only simple, but also has better speed control performance compared with the frequency conversion speed control of the induction motor.
These advantages and characteristics of the DC cooling fan can be used very well in the electronics industry and mechanical equipment. Because of its compactness and convenience, it also makes it more widely used.
The above are the advantages and performance of DC cooling fans. For more relevant knowledge, please consult our company.
1. The inverter has low cost and low capacity
When the inverter continues to run, the rated value refers to the peak value of the rectangular wave. Induction motors need sine wave currents, and DC motors need rectangular wave currents. The current rating when the inverter continues to run generally refers to the effective value of this sine wave. In order to maintain the inverter's ability to control the motor current, there should be a sufficient difference between the inverter's DC voltage and the motor's induced electromotive force. In this case, if it is assumed that the peak currents of the DC motor and the induction motor are equal, the power output of the former is 33% higher than that of the latter, that is to say, the same rectifier/inverter can drive higher output power than the induction motor 33% brushless DC motor.
2. High power factor
Its power factor is much higher than that of induction motors, because the excitation field of DC motors does not require reactive current from the grid. DC motors can run at 1 power factor, which is extremely beneficial for small power motors. Compared with induction motors, motors not only have higher efficiency and power factor at rated load, but also have advantages at light loads.
3. Low loss and high efficiency
The loss caused by the excitation current of the induction motor is eliminated, and the permanent magnet DC motor works in a synchronous operation mode because of the use of permanent magnet excitation. The frequency loss of the rotor core of the induction motor is eliminated. These two aspects make the operating efficiency of permanent magnet DC motors far higher than induction motors, and the efficiency of small-capacity motors is more obvious.
4. Good speed regulation performance and simple control
The speed control of the DC fan is not only simple, but also has better speed control performance compared with the frequency conversion speed control of the induction motor.
These advantages and characteristics of the DC cooling fan can be used very well in the electronics industry and mechanical equipment. Because of its compactness and convenience, it also makes it more widely used.
The above are the advantages and performance of DC cooling fans. For more relevant knowledge, please consult our company.
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