DC cooling fan is an important cooling equipment for modern industrial machinery. Its basic structure is generally composed of motors, bearings, blades, housing (including fixing holes), power plugs and wires. The motor is the core of the DC cooling fan. It is generally composed of a stator and a rotor. The stationary part of the motor is called the stator, and the part that rotates when it is running is called the rotor. So does the DC cooling fan have the function of impedance protection?

The impedance of the DC cooling fan will produce two functions, one is the impedance protection function, and the other is the thermal protection function, which are introduced as follows:  

1. Impedance protection: The high temperature exhaust fan is a kind of heat dissipation device that converts electrical energy into machinery through DC voltage and electromagnetic induction to drive the rotation of the blades. The design of the impeller and blades of the DC cooling fan is closely related to the airflow and pressure of the DC cooling fan and the resistance of the fan blades to pressure and collision. Seriously speaking, it affects the grade and quality of the entire DC cooling fan. Therefore, in order to prevent the motor from burning when it is turned off, the impedance protection sets the resistance (AC resistance) of the motor winding to keep the motor temperature rise below the burning temperature.

2. Thermal protection: In order to prevent the motor from burning when it is turned off, before the temperature rise of the motor reaches the burning temperature, the conventional fan is cut off by the thermal element without overheating protection, and the normal DC cooling fan can only be locked. 2H, the temperature rises slowly, over a long period of time, the motor will burn out, and the IC will burn to death, which is an important function of overheating protection.

From the above content, we can know that the DC brushless exhaust fan has impedance protection function, so everyone can use it with confidence. In addition, the balance of the blades of the DC cooling fan is related to the performance of the entire DC cooling fan, and the balance of the blades of the DC cooling fan Correction generally adopts dynamic balance. Its principle is that for stationary blade adjustable DC cooling fans and single-stage moving blade adjustable DC cooling fans, because they have only one-stage impeller, the mass imbalance caused by wear is concentrated on the impeller. Above, the dynamic balance process is a single-plane dynamic balance process, that is, a static balance process. If it is determined that the vibration is caused by mass imbalance, just measure a point of horizontal or vertical vibration on the shell near the bearing box, and use the influence coefficient method to increase the weight on the impeller, and the fan vibration can be reduced to the ideal range.