The inner rotor fan is a spindle or motor composed of iron core and coil. After the power is turned on, the fan generates a magnetic field through the starting copper block in the motor; the DC fan generates a magnetic field and drives the fan to rotate through the Hall IC.

The traditional motor is the stator outside,External rotor fanIt adopts the advanced and reasonable pneumatic design that directly drives the impeller, and has the characteristics of high efficiency, low noise, light weight, compactness, and convenient installation and maintenance.

　　External rotor fanIt has the advantages of compactness, space saving, and exquisite design. It is installed in the middle of the impeller and achieves a great cooling effect on itself. The variable speed starting current is small, and the protection level can reach IP54. Insulation grade B, F optional, internal are equipped with thermal protector. It can operate at ambient temperature between -30 ℃ and 60 ℃.

The advantages of the blade are that the blade is light, easy to produce and assemble, and low cost. Generally high speed, easy to do protective treatment. And the air volume can be much larger, can be made into energy-saving control products. Disadvantages are: easy to damage due to voltage instability, short service life. Moreover, the temperature rises, the speed is low, and the power consumption is large. It is easier to enter the dust and needs protection. Can be made into a fully enclosed honeycomb, through the start capacitor fast operation. Its advantages are low power consumption, high speed and high working efficiency. In the design of the system, there will be a certain margin in the selection of the motor, and the speed is fixed, but in the actual use process, sometimes it is necessary to run at a lower or higher speed, so it is very necessary to carry out frequency conversion transformation.

　　External rotor fanIn terms of structure, the power is generated externally, and the motor is installed on the impeller, which can achieve its own cooling effect. With its own characteristics and advantages, it has been widely used in life. Such as supermarket refrigerator freezers, ice machines, air coolers, chillers and other refrigeration equipment or facilities; or for ventilation and heat dissipation, as well as machine, central air conditioning, evaporator and other equipment and other supporting use.

Different fans are suitable for different use environments. Although these basics may seem simple, if you are not familiar with it, you will not be able to choose the right model.

　　External rotor fanCompared with some traditional fans, it has higher working efficiency, lower noise when working, light weight, compact structure, and more convenient operation. In fact, it is generally very delicate, and its structure is relatively compact, which can save space and is also very convenient for maintenance and installation. It is generally used in some air heaters, heat pumps, condensers or electronic equipment, such as air supply or heat dissipation equipment. It is a very common internal part of the machine.