From the analysis of the basic structure and performance characteristics of the motor, the shaft of the motor plays a supporting role on the one hand to the rotor core, and carries the mechanical properties of the motor through the bearing system with the stator part; the shape and material of the motor shaft directly affect the bearing of the motor However, few people pay attention to whether it has an impact on the current of the motor.
Generally speaking, for 4-pole, 6-pole and 8-pole motors, stainless steel shaft motors are no different from 45-digit steel or other shafts with magnetic permeability, because the magnetic permeability meter of the shaft is not used during electromagnetic calculation. Part of the magnetic circuit. For 2-pole motors, part of the motor shaft cross-section is included as part of the magnetic circuit. If the magnetic circuit is in a saturated state or close to saturation state, it will directly cause the rotor yoke to be oversaturated and the no-load current will increase It increases greatly or even sharply, so that the rated current increases, and the motor overheating or burns due to severe overheating.
Therefore, whether the material of the shaft will affect the current size depends on whether the shaft is composed of a magnetic circuit during the motor design; according to this idea, a conclusion can also be drawn: for the amplitude plate shaft of a large motor, it will also lead to an increase in the motor current. A very noteworthy issue, if not, these should all be attributed to the design level of the motor.
During the repair process of the motor, when it comes to shaft replacement, try to follow the original design of the motor to avoid inappropriate magnetic circuits due to material replacement.
Post time: Feb-11-2025