We are given a motor which has a rated efficiency of 91.7% The current is 25/12.5 A and power factor is 82%, full-load speed is 1765 rpm, the voltage is 230/460 V (1) Check the efficiency is correct with the given data. (2) How much will it cost to run the motor at full load for 16 hours per day, five days a week, and 50 weeks a year. Assuming the plant has a contracted rate of 12 cents per kwh.

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DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.