Motor efficiency calculation pdf

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First step is to measure present (old) kVA and. PF, or get them from the power bill. ▫ Calculate kW: kW = PF old. * kVA old. 2012. posed to calculate the motor efficiency under variable load and [19] Kostic´ MM. Analysis of induction motor efficiency class change at partial load.CALCULATING MOTOR EFFICIENCY FROM MEASURED LOAD DATA. By definition, a motor of a given rated horsepower is expected to deliver that quantity of power in a Maximum efficiency occurs at about 10% of the motor stall torque. Table 1. TORQUE. SPEED. CURRENT. POWER. EFFICIENCY. (oz-in). ( The cost effectiveness of an energy-efficient motor purchase depends on the number of hours the motor is used, the price of electricity, and the price premium