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|Title: ||Inverter control of linear induction motors with different reaction plates|
|Authors: ||Al-Dabbas, Salah Hamied|
|Issue Date: ||1980|
|Publisher: ||© Salah Hamied Al-Dabbas|
|Abstract: ||In recent years, attempts to develop new means of high
speed efficient transportation have led to considerable world
wide interest in high speed trains. This in turn has generated
interest in the linear induction motor, which is considered
to be one of the most suitable propulsion systems for
The operation of linear induction motors is based upon
the same natural principles as the cylindrical rotor form of
the machine, and this implies that the same methods of speed
control by static frequency changer can be used. Linear motor
speed control using·a variable frequency invertor, which has
been used for some years with rotary induction motors, is
investigated in this work.
The steady-state performance of a motor fitted, in turn,
with an aluminium reaction plate and aluminium cl added steel
reaction plate, is described.
A 3-phase variable frequency d.c. link-fed invertor has
been constructed to provide speed control for the motor.
The d.c. link is supplied from a voltage source. The invertor
has a single a.c. side commutation and operates with threethyristor
triggering, that is with 180° thyristor conduction, giving a quasi-square wave output voltage.
The logic control and thyristor switching circuits have
'been designed and built and are described in detail.
From no-load and locked rotor tests, the equivalent circuit
parameter for the linear induction motor with the two
types of reaction plates have been measured for different frequencies
with a sinusoidal supply. These are used to predict
the motor steady-state performance.
The measured performance of the motor with each type of
rotor with a sinusoidal supply is compared with the results
predicted for various frequencies (50, 40, 30, 20 and 10 Hz),
allowing for the effect of the variation of the equivalent
circuit rotor resistance parameter with slip frequency.
A comparison of the motor performance is made when fitted
with both types of reaction plate, when excited both sinusoidally
and from the invertor.|
|Description: ||A Master's Dissertation, submitted in partial fulfilment of the requirements of the award of the Master Of Science degree of Loughborough University.|
|Appears in Collections:||MSc Dissertations (Electronic, Electrical and Systems Engineering)|
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