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Sketch a typical torque vs speed curve for a high efficiency induction motor

Sketch a typical torque vs speed curve for a high efficiency induction motor

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Q4 (a) Sketch a typical torque vs speed curve for a high efficiency induction motor and indicate the following on the curve: (i) Synchronous speed (ii) Starting torque (iii) Breakdown torque (iv) A typical fan type load (b) The per phase equivalent circuit parameters for a 3 phase, 6 pole star connected induction machine operating off a 230V (phase voltage), 50 Hz supply are shown on Table Q4b. Assuming that friction and windage losses are negligible, determine the following for operation at a slip of 0.03: (i) (ii) (iii) (iv) (v) (vi) The per phase equivalent circuit (including values below) The actual motor speed (rpm) The mechanical power (W) The torque (Nm) The motor losses (W) The motor efficiency (%) Value Parameter Хм 1502 R. 4002 Rs 0.62 R, 0.452 Xeq 20 Table Q4b (c) Outline with the aid of a diagram an inverter driven variable speed induction motor drive from a fixed frequency 3 phase AC supply. Describe the basic inverter control requirements to achieve variable speed operation, and sketch typical torque speed curves.
Transcribed Image Text:Q4 (a) Sketch a typical torque vs speed curve for a high efficiency induction motor and indicate the following on the curve: (i) Synchronous speed (ii) Starting torque (iii) Breakdown torque (iv) A typical fan type load (b) The per phase equivalent circuit parameters for a 3 phase, 6 pole star connected induction machine operating off a 230V (phase voltage), 50 Hz supply are shown on Table Q4b. Assuming that friction and windage losses are negligible, determine the following for operation at a slip of 0.03: (i) (ii) (iii) (iv) (v) (vi) The per phase equivalent circuit (including values below) The actual motor speed (rpm) The mechanical power (W) The torque (Nm) The motor losses (W) The motor efficiency (%) Value Parameter Хм 1502 R. 4002 Rs 0.62 R, 0.452 Xeq 20 Table Q4b (c) Outline with the aid of a diagram an inverter driven variable speed induction motor drive from a fixed frequency 3 phase AC supply. Describe the basic inverter control requirements to achieve variable speed operation, and sketch typical torque speed curves.
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