A 500 V 125 HP, 1150 rpm d.c. shunt motor operates at rated conditions, driving constant torque load. The line current at rated conditions is 204.3 A. The total armature resistance is 0.0343 ohm and the field resistance of 96 ohms. (a) Determine the steady state armature current if 0.052 ohm resistor is connected in series with the armature and the field is weakened by 10 % from its rated value. (b) Determine the steady state speed for conditions in part (a). [Ans. Ia = 220.97 A, N2 = 1246 rpm]

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A:

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A: The solution can be achieved as follows.

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Q: useful flux

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Q: О 1220 гpm

A:

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Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.