What is the selection principle of fixed end and free end in the bearing system of motor products?
Thermal expansion and contraction are the physical properties of most metal materials. The thermal expansion and contraction performance of motor product parts is more obvious during the operation of the motor...
2020-12-31
Thermal expansion and contraction are the physical properties of most metal materials. The thermal expansion and contraction performance of motor product parts is more obvious during the operation of the motor. In order to avoid the impact of this phenomenon on the overall performance of the motor, the necessary countermeasures will be taken in the selection of parts materials, processing process control and coordination. Measures.
The bearing support system is an important component of the motor product to ensure the normal operation of the mechanical transmission system. Generally, the bearing support system that carries the normal operation of the rotating parts of the motor is designed as a two-fulcrum structure, one of which is a fixed end, and the other fulcrum must be a floating end. It's easy to say: the parts of the motor inevitably expand and shrink. However, when explored in detail, the simple problem is not as simple as it seems, and the question of how to lay out the fixed or floating end often poses a dilemma for designers. Next, Ms. Shen will talk about how to avoid the influence of thermal expansion and contraction factors on the mechanical performance of the motor.
Why should the fixed end of the motor give priority to the shaft extension end?
The shaft extension is the docking part of the motor product and the dragged equipment, and the relative stability of the shaft extension part in the radial and axial direction is undoubtedly the key to ensure the rotation accuracy of the equipment. In addition to ensuring that the motor shaft extension stiffness and machining accuracy meet the requirements in the manufacturing process, the control of the axial displacement of each component of the motor stator and rotor is also very critical, and the preferred selection of the motor shaft extension end as the fixed end can eliminate various uncontrollable factors (such as shaft channeling caused by additional axial force generated by fan and water pump loads, and the matching accuracy of docking parts caused by motor assembly errors).
Under what circumstances will the fixed end be selected at the non-shaft extension end?
When the equipment being dragged is not very high for the axial displacement of the motor shaft, or the bearing selected for the motor product is biased towards the load capacity, the non-shaft extension end can be selected as the fixed end. However, for the dragged equipment, the requirements for the axial displacement control of the motor are relatively high, or when the load is large equipment, try to set the bearing fulcrum of the shaft extension end as the fixed end. The three-bearing structure of large-scale high-voltage motors and low-voltage high-power motors actually takes into account the design goals of large enough load capacity and high precision with supporting equipment.
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