Numerical control machine tools mostly use high-speed motors, primarily because they possess superior mechanical characteristics with good stability; they have no slip loss, high efficiency, simple wiring, easy control, and low cost. They feature smooth speed regulation with high efficiency, high speed, and high power, rapid and reliable speed changes, and the ability for stepless speed variation. What are the common faults associated with them? Let's analyze them.

High-speed motors commonly exhibit mechanical failures such as overheating, vibration, and noise.

Motor overheating

Firstly, eliminate electrical faults causing motor overheating. Mechanical failures are typically due to damaged or excessively loose bearings in high-speed motors, leading to friction between the rotor and stator during high-speed rotation, or insufficient lubricant in the bearings, non-functioning or damaged exhaust fans, etc. Generally, replace the motor bearings or add an appropriate amount of lubricant, check if the exhaust fan is in good condition, and clean any dirt on the fan.

Motor Vibration

Vibration in motors can be caused by damaged bearings, loose fasteners on high-speed motors, or excessive gaps between the motor pulley and the motor shaft. At this point, we need to replace the motor bearings or add lubricant, tighten the bolts connecting the motor to the machine bed, check the dynamic balance of the pulley, and ensure that the inner diameter of the pulley matches the motor shaft without excessive gaps.

Section 3: Electric Motor Noise

The primary cause of noise in high-speed motors is typically due to damaged motor bearings or a lack of lubricant. You can replace the motor bearings, re-lubricate the bearings, and use high-temperature-resistant lubricant, ensuring the application is adequate.

Four: Unstable processing dimensions

Improper main shaft bearing damage, or excessive or insufficient bearing clearance, can lead to unstable dimensions in the processed products.

Jianken proposes that checking and replacing the main shaft bearing can be a solution. Severe bearing wear can directly affect the dimensional accuracy and surface roughness of the workpiece being machined. Adjusting the thickness of the bearing clearance shims can improve the axial and radial跳动 of the main shaft.