When an electric motor experiences performance problems or fails prematurely, the cause can frequently be traced to an incorrect voltage specification. Avoiding these errors is easy if one simple rule is followed: Rated motor voltage should be slightly lower than rated transformer (distribution) voltage.
Andy has been with Decatur Industrial Electric since 2007 and enjoys providing solutions for our customers. When not at work, Andy likes to carve stone and walking sticks. He is also a photography buff and enjoys capturing nature shots with his camera or drone!
According to EASA’s technical experts, changes in motor/system vibration readings provide the best early warning of developing problems in a motor or system component. Other parameters to monitor may include operating temperature of critical components, mechanical tolerances, and overall system performance, including outputs such as flow rate, tonnage, and volume.
Motor-specific baselines incorporate records of electrical, mechanical, and vibration tests performed when units are placed in operation or before they’re put in storage. Ideally, baselines would be obtained for all new, repaired, and in situ motors, but this may not be practical for some applications. These baselines typically include some or all of the following:
Our eyes looking through a commutator viewing window are still one of the best tools for identifying excessive arcing and sparking of the brushes on a DC motor. However, trending of the armature voltage in the time domain can provide an alternate visual tool in the detection of poor commutation and offset in the magnetic center. To see an example and read more about this technique please read: