As a high-power device, the design and configuration of the bearing system of a high-voltage motor is crucial to ensure the stable operation, load-bearing capacity and life of the motor. The design of the bearing structure is carefully planned based on these requirements. 

The following is a detailed explanation of the reasons from several aspects:

1. Basic composition and function of the bearing system Front bearing and rear bearing:

The front bearing is close to the mechanical load side and is responsible for bearing the main load; the rear bearing is close to the cooling fan side, providing auxiliary support and taking into account heat dissipation. Positioning end and free end: The positioning end prevents axial displacement by tightening the outer ring of the bearing to ensure stable operation of the motor; the free end allows the rotor to move axially within a specific range by designing the gap to adapt to changes such as thermal expansion and contraction.

2. Selection and matching of bearing types Deep groove ball bearings:

Suitable for occasions with high precision requirements and low friction coefficients, often used at the positioning end to limit axial movement, but with limited radial load capacity. Cylindrical roller bearings: Strong radial load capacity, suitable for bearing heavy loads and impact loads, often used as heavy-load support for free ends or shaft extension ends.

3. Advantages of three-bearing structure Enhance the load-bearing capacity:

High-voltage motors have high power and heavy loads. The three-bearing structure can significantly improve the load-bearing capacity of the shaft extension end. In particular, through the parallel use of cylindrical roller bearings and deep groove ball bearings, the former bears radial loads, and the latter acts as a positioning bearing to limit axial movement. The two complement each other to ensure that the motor runs stably under high loads.

Control axial movement: For working conditions that require strict control of axial movement, the three-bearing structure can more effectively limit the axial displacement of the rotor and meet high-precision requirements.

Extend service life: Reasonable bearing configuration can disperse the load and reduce the wear of a single bearing, thereby extending the service life of the entire bearing system.

4. Sealing and lubrication design

In order to prevent the bearing from running in circles during operation and keep it clean, the bearing system of the high-voltage motor adopts a labyrinth sealing structure and sealing ring to effectively prevent grease leakage and external impurities from invading. At the same time, it is equipped with an oil filling pipe and an oil drain pipe to facilitate the replacement of grease, and can achieve refueling or draining without stopping the machine, which improves the convenience of maintenance and the reliability of the motor.

 In summary, the three-bearing structure of high-voltage motors is adopted for many reasons, such as improving load-bearing capacity, controlling axial movement, extending service life, and facilitating maintenance. This design not only meets the motor's operating requirements under high-load and high-precision conditions, but also takes into account the stability and reliability of the system.

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