Browse Prior Art Database

Noise and Vibration Isolator Mounting for a Brushless DC Motor

IP.com Disclosure Number: IPCOM000121645D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 3 page(s) / 96K

Publishing Venue

IBM

Related People

Nguyen, L: AUTHOR [+4]

Abstract

Disclosed is a design technique that is used to reduce noise and vibration when mounting a motor to a base. The design achieves vibration isolation while maintaining radial positional accuracy without the introduction of an additional part (e.g., a shock mount). If needed, vibration damping can be included by the addition of a simple and inexpensive part that does not compromise radial positional accuracy.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Noise and Vibration Isolator Mounting for a Brushless DC Motor

      Disclosed is a design technique that is used to reduce
noise and vibration when mounting a motor to a base.  The design
achieves vibration isolation while maintaining radial positional
accuracy without the introduction of an additional part (e.g., a
shock mount).  If needed, vibration damping can be included by the
addition of a simple and inexpensive part that does not compromise
radial positional accuracy.

      The design technique can be extended to the mounting of any
component that may be a source of vibration.  The design is
exemplified in the mounting of a brushless DC motor.  The design
consists of shaping the stator at the mounting location of the
mounting screws such that the heads of the screws mount against a
spring-like member.  The stator of the motor is constructed with a
metallic collar 1 (see Fig. 1) that is shrunk-fit around laminates 2.
The motor is mounted using screws that pass through clearance holes 3
in the stator.

      The collar of the stator 1 is machined with slots 4 of length L
at each location of a mounting screw.  The length of the slots can be
varied as a method of changing the mounting stiffness and achieving
optimal vibration characteristics to reduce noise and improve
performance.  In essence, a slot is cut into the stator at the
mounting screw locations to create springs on which the stator is
mounted. The slots can be machined or molded in by usin...