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Motor Anti-Vibration Mounting

IP.com Disclosure Number: IPCOM000035405D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Lipscombe, JD: AUTHOR

Abstract

In order to reduce vibration, an electric motor is mounted on anti- vibration mounts in a longitudinal frame whose plane includes the center of gravity and is parallel to the motor spindle.

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Motor Anti-Vibration Mounting

In order to reduce vibration, an electric motor is mounted on anti- vibration mounts in a longitudinal frame whose plane includes the center of gravity and is parallel to the motor spindle.

A well-known problem exists with fans (in particular, centrifugal blowers), which are powered by low-cost shaded pole motors. A 100 hertz excitation exists (120 hertz on a 60 hertz supply), which can produce unacceptable vibration and acoustic levels.

Conventional mounting systems have two defects: 1. The anti-vibration mounts act in the wrong direction. 2. The center of gravity is not in the plane of the mounts.

The objective of the mounting system shown in the attached drawing is to allow the motor 1 to oscillate freely about axis XX. This axis is parallel to motor spindle 2 and passes through the center of gravity of motor 1. Anti-vibration mounts 3 are mounted in a frame 4 which is rigidly attached to a fan casing (not shown). When frame 4 is assembled to motor brackets 5, the plane of the mounts passes through axis XX. This arrangement gives a significant decrease in vibration level.

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