The magnetic shunt effect of the shaft in the motor_Wolong Nanyang Explosion-proof Motor, China Motor Manufacturer

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The magnetic shunt effect of the shaft in the motor

source：未知 time：2025-03-10 16:39nbsp; click：

The shaft is a very critical structural part of the motor product and is the direct subject of mechanical energy transmission. At the same time, for most motor products, the shaft will also serve as an important part of the motor magnetic circuit and bear a certain magnetic shunting effect. The vast majority of motor shaft materials are steel with magnetic conductivity, especially for large high-speed motors and small and medium-sized induction motors. The motor's rotor core is directly matched with the shaft. Under no-load conditions, the induction frequency of the motor rotor is very low, and the yoke magnetic flux will penetrate deeply into the rotor. The magnetic circuit shunting effect of the shaft is different for different motors and different conditions.

In the calculation of the magnetic circuit of the motor, the motor shaft is often included in the magnetic circuit, and some basic principles are determined according to the different pole numbers and shaft materials. The shaft of the 2-pole motor participates in a larger magnetic shunting effect, mainly due to the matching relationship between the rotor and the shaft of the 2-pole motor, and the particularity of the relatively small outer diameter of the motor rotor. 1/6 of the shaft of this type of motor, that is, 1/3 of the diameter, is included in the magnetic circuit calculation, that is, this part of the shaft is included in the magnetic circuit calculation of the motor; for motors with 4 poles or more, 1/12 of the shaft, that is, 1/6 of the diameter, is included in the magnetic circuit calculation. In view of the principle of the degree of participation of the shaft in the magnetic circuit calculation under different pole numbers, the change of the material of the 2-pole motor has a greater impact on the performance of the motor. For example, after directly replacing the ordinary shaft of the 2-pole motor with a stainless steel shaft, due to the magnetic density saturation problem, there will be serious current increase and winding heating problems; for other multi-pole motors, due to the ratio of the motor shaft diameter to the diameter of the rotor punching, and the principle of motor magnetic circuit design, replacing the ordinary shaft with a stainless steel shaft will not have a great impact on the performance of the motor. Understanding the principles of the motor shaft in the construction of the magnetic circuit can effectively prevent unnecessary mistakes in motor repair.

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