Gene Vogel
EASA Pump and Vibration Specialist

When a motor is test run in the service center, the two most common vibration frequencies that occur are at 1x rotating speed (1x rpm) and at 2x line frequency (2x lf). High 1x rpm is often corrected by balancing, and the 2x lf is traditionally attributed to air-gap anomalies or voltage or winding unbalance. However, there are those cases where the traditional approaches are unsuccessful and technicians and managers are left scratching their heads. In these difficult cases, there is often a combination of electrical and mechanical vibration. Being able to separate electrical and mechanical vibration is necessary to efficiently arrive at a solution.

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