Speed control of a 140 V, 1.68 kW DC motor single phase thyristorfull wave AC-DCIt is made by the converter. AA supply voltage 220 V (rms)Is 50. In the converterIt is assumed that there is no loss. The armature resistance of theDC motor is = 0.417 Q. Verya large inductance is connected in series with the motor. The motorvoltage constant is = 0.0964 V/rpm.The motor can be considered as a permanent magnet DC.According to this,a) Draw the driver (converter-motor) power circuit.b) Calculate the nominal current of the motor.c) Supply voltage, supply current, converter output voltage forignition angle a = 30 ° andDraw the waveforms for the converter output current.d) = 950 rpm and for nominal current,d1) The firing angle of the converter,d2) Effective value of supply and thyristor current,d3) Supply power factor,calculate.

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Engineering

Electrical Engineering

Speed control of a 140 V, 1.68 kW DC motor single phase thyristor full wave AC-DC

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

Speed control of a 140 V, 1.68 kW DC motor single phase thyristor
full wave AC-DC
It is made by the converter. AA supply voltage 220 V (rms)
Is 50. In the converter
It is assumed that there is no loss. The armature resistance of the
DC motor is = 0.417 Q. Very
a large inductance is connected in series with the motor. The motor
voltage constant is = 0.0964 V/rpm.
The motor can be considered as a permanent magnet DC.
According to this,
a) Draw the driver (converter-motor) power circuit.
b) Calculate the nominal current of the motor.
c) Supply voltage, supply current, converter output voltage for
ignition angle a = 30 ° and
Draw the waveforms for the converter output current.
d) = 950 rpm and for nominal current,
d1) The firing angle of the converter,
d2) Effective value of supply and thyristor current,
d3) Supply power factor,
calculate.

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