Rolling Element Bearings In Electric Motors

A rolling bearing in the motor supports and positions the rotor, maintains a small uniform air gap between the rotor and the stator, and transmits the load from the shaft to the motor frame. By using bearings suitable for the application, it is possible to operate the motor efficiently over the design speed range, minimizing friction and power loss, and realizing low noise and long life. On the other hand, if the motor is not properly used, the bearing will be damaged rapidly. For example, deep groove ball bearings optimized for inline couplers are overloaded when their motorized pulleys are installed.

Maintenance of these bearings is an important task for maintenance professionals, as rolling bearings are widely used in today's industry. Due to metal-to-metal contact, the rolling bearing is prone to wear and causes defects in the outer ring, the inner ring and the ball. Since it is also typically under high load and high operating speed it is also the most vulnerable part of the machine. Regular diagnosis of failure of rolling bearings is essential to the industrial safety and operation of machinery while reducing maintenance costs and avoiding downtime. In the outer ring, the inner ring and the outer ring, the outer ring is often susceptible to defects and defects

As rolling elements pass through the outer race and breakage, there is still room for discussion as to whether the rolling elements excite the natural frequency of the bearing parts. Therefore, it is necessary to determine the natural frequency of the bearing outer ring and its harmonics. Bearing faults generate pulses and generate harmonics with strong failure frequencies in the spectrum of the vibration signal. Because of their small energy, these fault frequencies are occasionally hidden by adjacent frequencies in the spectrum. Therefore, very high spectral resolution is often required during FFT analysis to identify these frequencies. Rolling bodies with free boundary conditions have natural frequencies of 3 kHz. Therefore, in order to detect the failure of the bearing using the bearing component resonance bandwidth method at the initial stage, it is necessary to use the accelerometer in the high frequency range, and it is necessary to acquire the data obtained over a long period.

A rolling bearing in the motor supports and positions the rotor, maintains a small uniform air gap between the rotor and the stator, and transmits the load from the shaft to the motor frame. By using bearings suitable for the application, it is possible to operate the motor efficiently over the design speed range, minimizing friction and power loss, and realizing low noise and long life. On the other hand, if the motor is not properly used, the bearing will be damaged rapidly. For example, deep groove ball bearings optimized for inline couplers are overloaded when their motorized pulleys are installed.