28-06-2012, 06:10 PM
VECTOR CONTROL OF INDUCTION MOTORS USING UPWM VOLTAGE SOURCE INVERTER
VECTOR CONTROL OF INDUCTION MOTORS.pdf (Size: 178.37 KB / Downloads: 70)
Abstract
The objective of this paper is to use the method of the vector control in the direction of the rotor
flux indirectly for induction motors. The space vector of the stator current is divided into two
components: magnetizing current and torque-producing current. By using the uniform pulse
width modulated inverter, torque pulsation will be reduced and a robust control with quick
dynamic response for induction motor is achieved.
INTRODUCTION
In recent years the control of high-performance
induction motor drives for general industry
applications and production automation has
received widespread research interests. Many
schemes have been proposed for the control of
induction motor drives, among which the fieldoriented
control [1, 2], or vector control, has been
accepted as one of the most effective methods. The
vector control strategy is formulated in such a way
that the stator current phasor, in the two-axis
synchronously rotating reference frame, has two
components: magnetizing current component and
torque-producing current component.
Mathematical model and vector control
The mathematical model of a three-phase, Yconnected,
squirrel-cage induction motor and load
is described by equations in the synchronously
rotating reference frame (x-y) as [2]
Conclusions
This paper has presented a vector control system
for induction motor drives. The vector control
methodology given by [2] has been simulated by
the advantage of using UPWM in which the less
harmonics have been achieved. The simulation
results showed that the performance of the
induction motor was exactly the same as the
separately excited DC motor having also a quick
dynamic response and low torque pulsation.