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Experiment No. - 7 Speed Control of Separetly Excited DC Motor Using Single Phase Half Controlled Rectifier

This document describes an experiment to simulate speed control of a separately excited DC motor using a single phase half controlled rectifier. The theory section explains that the rectifier uses gate pulses from α to π to control thyristor T1, and from (π + α) to 2π to control thyristor T2. This allows control of the motor terminal voltage and thereby control of motor speed. The document presents equations for calculating motor speed in discontinuous and continuous conduction modes and describes the simulation setup in MATLAB/Simulink, including output waveforms for voltage and speed.

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94 views6 pages

Experiment No. - 7 Speed Control of Separetly Excited DC Motor Using Single Phase Half Controlled Rectifier

This document describes an experiment to simulate speed control of a separately excited DC motor using a single phase half controlled rectifier. The theory section explains that the rectifier uses gate pulses from α to π to control thyristor T1, and from (π + α) to 2π to control thyristor T2. This allows control of the motor terminal voltage and thereby control of motor speed. The document presents equations for calculating motor speed in discontinuous and continuous conduction modes and describes the simulation setup in MATLAB/Simulink, including output waveforms for voltage and speed.

Uploaded by

bhagchandt817
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Control of Electrical Drives (2160913)

EXPERIMENT NO. 7
SPEED CONTROL OF SEPARETLY EXCITED DC MOTOR USING SINGLE
PHASE HALF CONTROLLED RECTIFIER
AIM: To study and simulate single phase half controlled rectifier for speed control of
separately excited dc motor with MATLAB/Simulink.

REQUIRE MATLAB
SOFTWARE:

THEORY: The drive shown in fig. T1 receive gate pulses from to and T 2 from ( + )
to 2. Motor terminal voltage and current waveforms for the dominant
discontinuous and continuous conduction mode are shown in fig.
In discontinuous conduction mode when T1 is fired at motor gets connected to
the source through T1 and D1 and Va = Vs. The armature current flows and D2
gets forward biased at . Consequently armature current freewheels through
the path formed by D1 and D2, and the motor drops to 0 to and stays zero
until T2 is fired at ( + ). Similarly the continuous mode can be explained.

Discontinuous mode:
A cycle of motor terminal voltage consists of three intervals:



E d
+
t d ( t ) +

V m sin



1
V a=


1+cos + ( + ) E

Vm
V a=

Shunt and separately excited motors:

Sigma Institute of Engineering (050) Page No.


Control of Electrical Drives (2160913)

V Ra
m= T
K K2


1+cos

V m
m=

Continuous mode:

1 V
V a= V m sin t d ( t ) = m (1+cos )


Ra
1+cos T
K2
Vm
m=
K

Figure 1 Single phase half controlled rectifier connected with separately excited DC motor

Sigma Institute of Engineering (050) Page No.


Control of Electrical Drives (2160913)

Figure 2 Discontinuous conduction mode

Figure 3 Continuous conduction mode

V s=V m sin t

Discontinuous mode:
+

V m sin t d (t )+ E d (t )

V a =

Sigma Institute of Engineering (050) Page No.


Control of Electrical Drives (2160913)


cos cos + ( + ) E

Vm


cos cos

Vm
m =

Continuous mode:
+
V a= V m sin t d( t)

2Vm
cos

2V m R
m= cos a2 T
K K

MATLAB/SIMULINK

Figure 4 Single Phase half controlled rectifier with separately excited dc motor

Sigma Institute of Engineering (050) Page No.


Control of Electrical Drives (2160913)

Figure 5 VS and V0 at = 30

Figure 6 Speed at = 30

Sigma Institute of Engineering (050) Page No.


Control of Electrical Drives (2160913)

OBSERVATION Sr. No. Firing Angle Speed (rad./s)


TABLE:
1

CONCLUSION:

Sigma Institute of Engineering (050) Page No.

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