Vibration modes and acoustic noise in a 4-phase switched reluctance motor

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:419531

Colby, R S ^[1]; Mottier, F ^[2]; Miller, T J.E. ^[3]

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1. United Technologies Research Center, East Hartford, CT (United States)
2. Mottier (Francois), West Hartford, CT (United States)
3. Univ. of Glasgow (United Kingdom). Dept. of Electronics and Electrical Engineering

Acoustic noise in the switched reluctance motor is caused primarily by the deformation of the stator lamination stack. Acoustic noise is most severe when the periodic excitation of the SRM phases excites a natural vibration mode of the stack. The natural vibration modes and frequencies of a 4-phase, 8/6 switched reluctance motor are examined. Structural finite element analysis is used to compute the natural modes and frequencies. Impulse tests on the stator stack verify the calculations and show which modes are excited. Heuristic arguments are developed to predict the operating conditions that will excite the natural modes. Measurement of vibration while the machine is under load shows which operating conditions excite the natural modes and verifies the predictions. An approximate formula is derived to predict the frequency of the fundamental vibration mode in terms of lamination dimensions and material properties. The formula is validated by comparison with finite element calculations for several laminations, and hence is shown to be useful in design trade-off studies.

• OSTI ID: 419531
• Report Number(s): CONF-9510203--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ELECTRIC MOTORS
ENERGY EFFICIENCY
FINITE ELEMENT METHOD
MECHANICAL VIBRATIONS
NOISE
OSCILLATION MODES