Squirrel-cage motors are widely used in industry. The efficiency at which these motors operate directly affects the energy intensity of the industrial processes in which they are utilized. This article presents selected methods for estimating the efficiency coefficient for use in control systems for pump sets. Basic relationships for determining power losses in a squirrel-cage motor are also provided.The use of energy-efficient control systems reduces the energy intensity of industrial processes, thereby lowering operating costs [2,3,4]. A measure of the energy intensity of pumping processes is the specific energy consumption coefficient, which depends on the water head in the pump set and the instantaneous efficiency coefficient of individual pump units [4,13]. The efficiency coefficient of a pump unit is the product of the efficiency coefficients of the pump, the motor, and the frequency converter. Pump station control systems characterized by a high energy efficiency coefficient should select the operating point of the pump, motor, and frequency converter in such a way that these devices operate within the range of their highest efficiency [4,5,12,13]. (…)
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Source: Czasopismo Logistyka