Question

A separately-excited DC motor is delivering rated torque at rated speed. find the efficiency of the motor at this operating point. The details of the machine are as follow : 1500 kW, 600 V, rated current = 2650 A, 600 rpm, brush voltage drop = 2 V, field power input = 50 kW, Ra = 0.003645 ?, La = 0.1 mH, machine frictional coefficient = 15 N.m/(rad/sec). Field current is constant and the armature voltage is variable. 91.46%

Name: A separately-excited DC motor is delivering rated torque at rated speed. find the efficiency of the motor at this operating point. The details of the machine are as follow : 1500 kW, 600 V, rated current = 2650 A, 600 rpm, brush voltage drop = 2 V, field power input = 50 kW, Ra = 0.003645 ?, La = 0.1 mH, machine frictional coefficient = 15 N.m/(rad/sec). Field current is constant and the armature voltage is variable. 91.46%
Uploaded: 2023-06-27T13:56:48-08:00
Duration: 4 min 13 s
Channel: Madhur L

          A separately-excited DC motor is delivering rated torque at rated speed. find the efficiency of the motor at this operating point. The details of the machine are as follow : 1500 kW, 600 V, rated current = 2650 A, 600 rpm, brush voltage drop = 2 V, field power input = 50 kW, Ra = 0.003645 ?, La = 0.1 mH, machine frictional coefficient = 15 N.m/(rad/sec). Field current is constant and the armature voltage is variable. 91.46%

A separately-excited DC motor is delivering rated torque at rated speed. find the efficiency of the motor at this operating point. The details of the machine are as follow : 1500 kW, 600 V, rated current = 2650 A, 600 rpm, brush voltage drop = 2 V, field power input = 50 kW, Ra = 0.003645 ?, La = 0.1 mH, machine frictional coefficient = 15 N.m/(rad/sec). Field current is constant and the armature voltage is variable. 91.46%

Added by Carolyn R.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Madhur L

06/27/2023

Step 1

The output power of the motor is given as 1500 kW. This is the mechanical power delivered by the motor at the rated condition. Show more…

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A separately-excited DC motor is delivering rated torque at rated speed. find the efficiency of the motor at this operating point. The details of the machine are as follow : 1500 kW, 600 V, rated current = 2650 A, 600 rpm, brush voltage drop = 2 V, field power input = 50 kW, Ra = 0.003645 Ω, La = 0.1 mH, machine frictional coefficient = 15 N.m/(rad/sec). Field current is constant and the armature voltage is variable. 91.46%