This article mainly analyzes the energy loss components of industrial fan motors during use, focusing on how to reduce the mechanical losses of the motor during operation to achieve the purpose of energy saving and efficiency improvement.

1. Composition of energy loss of asynchronous motor

(1) Copper loss: stator copper loss; rotor copper loss; stray loss.

(2) Core loss.

(3) Mechanical losses: ventilation losses; friction losses.

Judging from the energy losses of asynchronous motors listed above, copper losses and iron losses are not easy to change during maintenance. They are determined by the design, while mechanical losses can be changed. Generally speaking, asynchronous motors with fewer stages, that is, motors with higher revolutions, have larger mechanical losses and less copper losses; while motors with more stages, that is, motors with lower revolutions, have a greater proportion of copper losses than mechanical losses. Therefore, if we want to reduce the energy loss of the motor, we must start by reducing the mechanical loss of the motor.

2. Main methods to reduce mechanical losses of electric motors

Reduce the mechanical loss of the motor mainly from the following aspects:

(1) Use high-efficiency fans (such as airfoil-type axial flow fans).

(2) Adjust the gap between the windshield and the outer circle of the fan blade.

(3) For light-load motors, appropriately reduce the outer diameter of the fan.

(4) Use high-quality bearings.

(5) Use high-quality lubricants.

(6) Improve the quality of motor assembly.