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A 210V, 900rpm, 140 A separately excited do motor has an armature resistance of 0.070. It is fed from a single phase fully controlled rectifier with an ac source voltage of 235V, 60HZ. Assuming continuous conduction. Determine i) Back emf ii) Firing angle for rated motor torque and -600rpm iii) Motor speed for a = 150° and rated torque. iv) Firing angle for rated motor torque and 700rpm.

A 210V, 900rpm, 140 A separately excited do motor has an armature resistance of 0.070. It is fed from a single phase fully controlled rectifier with an ac source voltage of 235V, 60HZ. Assuming continuous conduction. Determine i) Back emf ii) Firing angle for rated motor torque and -600rpm iii) Motor speed for a = 150° and rated torque. iv) Firing angle for rated motor torque and 700rpm.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A 210V, 900rpm, 140 A separately excited dc motor has an armature resistance of 0.070. It is fed from a single phase fully controlled rectifier with an ac source voltage of 235V, 60HZ. Assuming continuous conduction. Determine i) Back emf ii) Firing angle for rated motor torque and -600rpm iii) Motor speed for a = 150° and rated %3D torque. iv) Firing angle for rated motor torque and 700rpm. i) Back emf ii) Firing angle iii) Motor speed iv) Firing angle
Transcribed Image Text:A 210V, 900rpm, 140 A separately excited dc motor has an armature resistance of 0.070. It is fed from a single phase fully controlled rectifier with an ac source voltage of 235V, 60HZ. Assuming continuous conduction. Determine i) Back emf ii) Firing angle for rated motor torque and -600rpm iii) Motor speed for a = 150° and rated %3D torque. iv) Firing angle for rated motor torque and 700rpm. i) Back emf ii) Firing angle iii) Motor speed iv) Firing angle
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