http://repository.osakafu-u.ac.jp/dspace/ Title Variable Gain Magnetic Amplifier and Application for Parameter Invaria nce Control System Author(s) Takashima, Yoshinao; Hata, Shiro Editor(s) Citation Bulletin of University of Osaka Prefecture. Series A, Engineering and nat ural sciences. 1971, 19(2), p.337-347 Issue Date 1971-03-31 URL http://hdl.handle.net/10466/8159 Rights
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http://repository.osakafu-u.ac.jp/dspace/
TitleVariable Gain Magnetic Amplifier and Application for Parameter Invaria
nce Control System
Author(s) Takashima, Yoshinao; Hata, Shiro
Editor(s)
CitationBulletin of University of Osaka Prefecture. Series A, Engineering and nat
ural sciences. 1971, 19(2), p.337-347
Issue Date 1971-03-31
URL http://hdl.handle.net/10466/8159
Rights
337
Variable Gain Magnetic Amplifier and Application
for Parameter Invariance Control System
Yoshinao TAKASHIMA' and Shiro HAtA'
<Received November 13, 1970)
In this paper,. the variable gain magnetic amplifier is described, which has the
characteristics of multiplier and divider as well as fast response and・-moreover has power
output. This magnetic amplifier is theoretically analyzed and then its results are
compared with the experimental ones. Consequently its static characteristic is linear,
though the experimenta! results differ considerably from the theoretical values. It is also
. descrihed that this magnetic amplifier indicates good results when it is applied to the
parameter invariartce control system.
1. Introduction
Up to the present, many investigationsi) of magnetic amplifier have been reported,
but it seems that there are no magnetic amplifiers which serve as multiplier and divider
as well as power amplifier. '
In this paper, the new magnetic amplifier2) which satisfies the above-mentioned
three functions, is proposed. This magnetic amplifier is constructed with three reactors
,and one thyristor, and every core of the reactors is assumed to have the same magnetic
characteristic, Originally the flux is determined by the voltage time integral. Therefore
the core flux can be controlled, by means of the change of either voltage or interval of
integration. In this manner, the first core flux is controlled, then this situation is
transfered to the third core through the second, and finally the powe'r output is
obtained from the output winding on the third core. Since this magnetic amplifier is
based on the principle of ha!fwave magnetic amplifier, good dynamic behavior is
obtained.
Under the assumption of the ideal magnetization curve, the characteristic of this
amplifier is analyzed and consequently it is shown that this amplifier is availabie as
multiplier and divider. These functions are assured experimentally. The available linearity
of the characteristic is recognized, though the experimental values diffbr from the
theoretical ones. - When this magnetic amplifief is used to the parameter invariance control system4) as
,an application, consideral)le performance2) is obtained. ・
* Department of Electronics, College of Engineering.
--
338
win
' Y.TAKAsHIMA and S・HATA
2. Circuit construction
The three reactors, I, II, III, and a thyristor are connected as shown in Fig.1. The
dings, Nig, Mr, Mg, and Nbr, have the same number of turns. Thyristor turns on at
va
va
va
va
Intagrator
Rc Reactor.
.tc'Nc
Comparator and
Pulee Generator
I -i,Mt
e-
M
10H
k
'Rs
Thyristor.
tla1 tla2
'cgo
Rh'
N - tlaB
e Reactor II
Mr
Reactor
li'
'.,M
m
th4 = Vh4
N Ro
sin wt
Ve
the phase angle efi and
The turn-on angle efi
va, va,and iV2 stand
constant amplitude sinusoidal-voltage
to determine the working point
which is connected to
and is given as the function
To explain the behavior
magnetic characteristic shown
Since the three cores
view poit of understand
by the flux of each core
obtained. For this purpose, the flux values of three
of voltage time integral.
Mr il Ms
.
Fig. 1 Circuit construodon.
turns off at the end of this entire cycle of the power supply.
is decided by the phase angle of the comparator output pulse.
fbr the d-c voltages. The voltages vai(i=1, 2, 3) equal the
Vb sin tot. Vb is the d-c bias voltage and is used
of the reactor I. The voltage vo across the resistance Ro,
the reactor llI,is the output voltage of this magnetic amplfier,
of Vi,Vb,and V2.
3. Principte of operation
of the magnetic amplifier, assume that the cores have ideal
in Fig.2 for simplicity. ・ are used in this magnetic amplifier, it is very significant, in
ing the operation, to consider how the information represented
is transfered from one to another and the output voltage is
cores are drawn in Fig.3 in the form
Although Fig.3 shows the waveforms in case of ef2>rr,the