Abstract
Induction motors represent a major noise problem in the petrochemical industry. Retrofit noise reduction frequently requires the use of inlet and outlet mufflers. Be they commercially available units or custom designs, the most severe constraint is often the maximum pressure loss the motor can support without serious reduction of operating lifetime due to excess temperature. Typically, a 10°C increase will reduce the lifetime by half, due to degradation of electrical insulation. One cannot base the true cost of a noise reduction treatment on its capital cost alone if it may reduce the operating life of the machine. This paper presents a technique to simulate the effect of a muffler in order to determine the motor flow characteristics, and at the same time, determine the motor internal temperature versus flow characteristic by electrical resistance measurements. Actual mufflers whose designs were based upon such measurements will be described. The influence of mufflers on the explosion-proof rating of motors will also be discussed.
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