The correct way to open the DC fan accessories
Each product has its life span, and when it is used to a certain extent, the parts in the machine will also malfunction and deteriorate. Today, the theme that Tong Chi shares with you is: 'The correct way to open DC fan accessories' The details are as follows.
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u003cbru003e Before buying a DC fan, let me introduce the main family of DC fan accessories to everyone, and see how to open it correctly!
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u003cbru003e Outer frame: pressed plastic, generally square or round;
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u003cbru003e Bearings: made of high-precision ball bearings;
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u003cbru003e Blade: fixed on the outer rotor of the fan, the outer rotor is a plastic magnetic ring;
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u003cbru003e Magnetic strip: a plastic disk is used to form a magnetic strip with magnets after being magnetized by a magnetizer;
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u003cbru003e Rotor: The blade and the magnetic strip together form the rotating part of the DC cooling fan;
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u003cbru003e Stator: The fixed non-rotating part of the cooling fan, generally four large teeth constitute four poles, and two sets of coils are wound on the four poles.
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u003cbru003e After reading the main families of DC fan accessories, you should also have a general understanding of DC fans! When your device has a heat dissipation problem, you can start from the direction of the accessories to determine the problem of the device.
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u003cbru003e Advantages of DC cooling fan:
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u003cbru003e 1. Inverter cost is low, inverter capacity is low
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u003cbru003e The current when the inverter continues to run, the rated value refers to the peak value of the rectangular wave, induction motors require sine wave current, and DC motors require rectangular wave current. 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.
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u003cbru003e 2. High power factor
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u003cbru003e Its power factor is much higher than that of induction motors, because the excitation magnetic 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 load.
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u003cbru003e 3. Low loss and high efficiency
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u003cbru003e 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.
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u003cbru003e 4. Good speed regulation performance and simple control
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u003cbru003e 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.
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u003cbru003e Follow our cooling fan manufacturer Shenzhen Tongchi Automobile, and take you to open the door of cooling fan knowledge.
