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3. An alternatively excited motor, PN=22KW, UN = 220V, IN = 115A, IN = 1500r/ min, armature resistance Ra= 0.1, and the motor drives constant torque Rated load. (1)Require 1100r/min operation speed, using series resistance speed regulation, armature circuit should be in series with how many resistor? (2) How many volts should the armature voltage be reduced to when the speed of 900r/min is required and the speed of the armature should be adjusted by step-down method? (3) the operation speed of 1800r/min is required. How about the degree of weakening magnetism?

3. An alternatively excited motor, PN=22KW, UN = 220V, IN = 115A, IN = 1500r/ min, armature resistance Ra= 0.1, and the motor drives constant torque Rated load. (1)Require 1100r/min operation speed, using series resistance speed regulation, armature circuit should be in series with how many resistor? (2) How many volts should the armature voltage be reduced to when the speed of 900r/min is required and the speed of the armature should be adjusted by step-down method? (3) the operation speed of 1800r/min is required. How about the degree of weakening magnetism?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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3. An alternatively excited motor, PN = 22KW, UN = 220V, IN = 115A, ÎN = 1500r/ min, armature resistance Ra= 0.1, and the motor drives constant torque Rated load. (1)Require 1100r/min operation speed, using series resistance speed regulation, armature circuit should be in series with how many resistor? (2) How many volts should the armature voltage be reduced to when the speed of 900r/min is required and the speed of the armature should be adjusted by step-down method? (3) the operation speed of 1800r/min is required. How about the degree of weakening magnetism?
Transcribed Image Text:3. An alternatively excited motor, PN = 22KW, UN = 220V, IN = 115A, ÎN = 1500r/ min, armature resistance Ra= 0.1, and the motor drives constant torque Rated load. (1)Require 1100r/min operation speed, using series resistance speed regulation, armature circuit should be in series with how many resistor? (2) How many volts should the armature voltage be reduced to when the speed of 900r/min is required and the speed of the armature should be adjusted by step-down method? (3) the operation speed of 1800r/min is required. How about the degree of weakening magnetism?
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