5. A four pole, 60 Hz, 230 V induction motor has the equivalent circuit shown below. Its rated speed is 1725 RPM. V an 0.62 j3 2 www a) Find its rated slip. b) Find the output power P c) Find the output torque Te mech mech j5 Q2 j25 Ω at rated conditions. at rated conditions. 0.35 Ω

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A:

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A: Efficiency = output power/ input power. Total losses = cupper loss + rotational losses.

Q: A 100 V DC separately excited motor has armature resistance 2 ohms and voltage constant of 0.6 V…

A: V = 100 V Ra = 2 ohm Kb= 0.6 V/rad/s T= 20 Nm Kt = 50 Nm/s

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.