Small motor shafts generally have the characteristics of high speed, frequent startup, and easy to rise at work. Its work conditions reasonably choose materials and heat treatment are an important task in front of each designer. The materials and appropriate heat treatment methods use their best can often receive the effect of low price and less effort.
The axis generally requires vibration resistance and impact. Therefore, it is generally adopted by the method of regulating or carburizing quenching to increase the surface of the shaft to increase hardness, improve wear resistance, and maintain the toughness of the axis and improve the impact resistance.
The motor shaft is generally made of high -quality carbon steel. You can choose 35#, 45#. Generally use 45#steel. These two materials are medium -carbon steel, and their strength, stiffness, and toughness can meet the work needs of the motor shaft. The motor axis speed is high and the torque is small. It is made of 45#and does not require other thermal treatment. The raw material is a state of fire. The supply performance of the raw material can meet the mechanical performance requirements of the motor shaft.
What are the reasons for the axial vibration of the motor?
A. Electromagnetic. B. Mechanical aspect. C. Mixed electrometers and electrical mixed.
A. Electromagnetic
1. In terms of power supply: three -phase voltage (unbalanced, three -phase electric motor operation).
2. In terms of stator: the iron core becomes ellipse, eccentric, loosening, the winding of the winding, the grounding break, the short circuit of the turbipularity, the three -phase current unbalanced of the wiring error.
3, rotor failure: iron core becomes ellipse, eccentric, loose, rotor short circuit ring and cage strip open welding and broken. Wind rotor three -phase winding level is unbalanced, winding breaks, grounding breaks, turbine breakdown, wiring errors, and poor brush contact.
B. Mechanical aspect
1. In terms of motor: rotor imbalance, rotation bend, sliding ring deforms, uneven air gaps, and inconsistency of the magnetic force center. Bearing failure: poor foundation installation. The mechanical strength is not enough. Resonance, ground foot screw loose, motor fan damage. When the bearing operation is close to the service life, the motor vibration gradually increases, and the bearing operation has noise. The phenomenon of research on the bearing research and the emergence of a sweeping hall may occur.
2. In terms of coordinator in the coupling: the joints are damaged, the connection is poor, and the resonance of the unbalanced system of the load mechanical mechanical machine is not allowed to find the center.
C. Mixed electrical aspects
1. Motor vibration is often uneven air gap, causing unilateral electromagnetic pulling force, and the tensile force further increases the air gap. Mixed electrometers and electrical mixed effects are electromechanical vibration.
2. The axial string of the motor, the gravity of the rotor itself or the level of installation, and the electromagnetic pulling force caused by the magnetic force center causes the axial movement of the motor, causing the motor vibration to increase, and the severe situation of the axial tile wear, causing the axial tile temperature to quickly increase the cause of vibration.
