Variable frequency motors play a crucial role in industrial applications, characterized by their ability to achieve variable motor speeds, offering greater flexibility. Compared to standard frequency motors, the design and manufacturing of variable frequency motors require consideration of several key control points. In this article, we will discuss these points to better understand the characteristics and advantages of variable frequency motors.

Special Ventilation Structure:

Variable frequency motors operate over a wide speed range, necessitating a specially designed ventilation structure. Traditional standard frequency motors typically use self-fan cooling structures since their output and speed remain relatively constant. However, variable frequency motors require additional cooling, especially at lower speeds, often requiring forced ventilation structures. This is why most variable frequency motors need to be equipped with independent fans.

High Insulation Class:

Variable frequency motors are powered by inverters, which can produce non-standard sinusoidal waveforms in the input power, including frequency-varying harmonic components. This places extra stress on the motor windings, necessitating a higher insulation class. In general, the insulation class of variable frequency motors should not be lower than Class F.

Control of Corona Discharge:

Variable frequency motor windings may experience issues related to corona discharge. Therefore, it's essential to choose electromagnetic wire materials carefully. Depending on the specific operating conditions, some manufacturers opt for electromagnetic wires with thicker insulation coatings or even specialized wires designed for variable frequency motors to enhance motor reliability.

Bearing System Protection:

The bearing systems in variable frequency motors are susceptible to the effects of shaft currents, requiring necessary protective measures. The choice of protective measures depends on the motor's specifications and operating characteristics.

In the design and manufacturing of variable frequency motors, it is crucial to consider the above-mentioned key control points to ensure motor performance and reliability. These points encompass ventilation structures, insulation class, control of corona discharge, and bearing system protection. Through sound design and control, variable frequency motors can better adapt to various application scenarios, harnessing their advantages of variable speed to provide efficient power solutions. For high-efficiency variable frequency motors, you can rely on Fangli Electric Motor to deliver exceptional performance.