A 3-phase 6-pulse converter is operated from a three-phase delta- connected 230 V, 50 Hz supply to supply a separately excited DC motor. The motor is rated at 220 V, 600 rpm, 500 A and it has an armature resistance of 0.02 02. (i) Draw the circuit diagram of the system, and state what electronic component is used for the converter. Explain how this component works. (ii) Calculate the delay angle a. (iii) Calculate the delivered torque at rated conditions. (iv) If the mechanical loss torque is 150 Nm, and the power lost in the field winding is 3500 W. Calculate the full load efficiency of the motor.

A 3-phase 6-pulse converter is operated from a three-phase delta- connected 230 V, 50 Hz supply to supply a separately excited DC motor. The motor is rated at 220 V, 600 rpm, 500 A and it has an armature resistance of 0.02 02. (i) Draw the circuit diagram of the system, and state what electronic component is used for the converter. Explain how this component works. (ii) Calculate the delay angle a. (iii) Calculate the delivered torque at rated conditions. (iv) If the mechanical loss torque is 150 Nm, and the power lost in the field winding is 3500 W. Calculate the full load efficiency of the motor.

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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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

A 3-phase 6-pulse converter is operated from a three-phase delta-
connected 230 V, 50 Hz supply to supply a separately excited DC
motor. The motor is rated at 220 V, 600 rpm, 500 A and it has an
armature resistance of 0.02 Q.
(i) Draw the circuit diagram of the system, and state what electronic
component is used for the converter. Explain how this component
works.
(ii) Calculate the delay angle a.
(iii) Calculate the delivered torque at rated conditions.
(iv) If the mechanical loss torque is 150 Nm, and the power lost in the
field winding is 3500 W. Calculate the full load efficiency of the motor.

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