JPH0262045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to magnetic amplifiers, and more particularly to improvements in small and lightweight magnetic amplifiers.

〔Technical field〕

Conventionally, saturable reactor type magnetic amplifiers have been proposed, but conventional magnetic amplifiers use materials such as iron and copper that increase in proportion to the increase in rated capacity, resulting in significantly large dimensions and weight. It was extremely expensive. Moreover, the large waveform distortion of the output voltage required a bulky and expensive external filter.

[Purpose of the invention]

An object of the present invention is to provide a small and lightweight magnetic amplifier with a good output waveform.

[Structure of the Invention] The magnetic amplifier of the present invention is arranged between a main magnetic flux loop path including a first saturable iron core having an input winding and an output winding, and the input winding and the output winding. at least one magnetic shunt core with an air gap for bypassing a portion of the main flux loop path; and one of the first saturable cores between the magnetic shunt core and the output winding. an auxiliary magnetic flux loop path including a second saturable core magnetically coupled to the first saturable core and an extension thereof; and a control winding for magnetically saturating the part of the first saturable core to shift the magnetic flux of the input winding to the magnetic shunt core. do.

〔Example〕

A preferred embodiment of the magnetic amplifier according to the present invention will be described with reference to FIGS. 1-5.

In FIG. 1, a magnetic amplifier 10 includes a first core portion 12a and a second core portion 1 that constitute a main magnetic flux loop path.
2b and a magnetic shunt core 14 for bypassing a portion of the main magnetic flux loop path, the first volume core 12 acts as a first saturable core. The input winding 1 is placed on the first core part 12a of the first core 12.
8 is wound on the second core portion 12b, and on the other hand, the output winding 20 is wound on the second core portion 12b. A second winding core 22 that acts as a second saturable core to control the magnetic flux density of the magnetic shunt core 14 by changing the magnetic saturation state of at least a portion of the second core portion 12b, and a control winding 24.
is provided.

2 and 3, the first volume core 12 includes a center leg 26 and outer legs 28, 30 that constitute a main magnetic flux loop path. The center leg 26 includes a first core portion 12a and a second core portion 12b separated by the magnetic shunt core 14. Additionally, the center leg 26 includes an extension, or third core portion 12c, extending outwardly from the outer legs 28,30. center leg 26
is placed on the first core 12, and the fixture 3
2 and 34 to be fixed to each other and integrated. As is clear from FIGS. 2, 3, and 5, the magnetic shunt core 14 is composed of a C-shaped cross-sectional core made by laminating a large number of silicon steel plates. Groove 14a of magnetic shunt core 14 is arranged to magnetically couple with center leg 26. end portion 14b of magnetic shunt core 14;
14c is arranged between the coil blocks of the first series winding 16 and the shunt winding 18 and the coil block of the second series winding 20, with inserts 36 and 38 having a required thickness corresponding to a constant air gap sandwiched therebetween. Volume 1 iron core 1
placed on the outer legs 28, 30 of 2;
The outer leg 2 is fixed by the fixing devices 40 and 42.
8 and 30, each core is integrated.
The magnetic shunt core 14 transfers a part of the magnetic flux of the main magnetic flux loop path to a gap (intermediate 36,
38) to the outer legs 28, 30 to adjust the output voltage as described below, and also function to attenuate high frequencies and reduce waveform distortion of the output voltage. The second winding core 22 has a center leg on the underside of the magnetic shunt core 14, that is, between the coil blocks of the first series winding 16 and shunt winding 18 and the coil block of the second series winding 20. The iron cores are arranged on the upper part of the second core part 12b and the lower end part of the third core part 12c of 26, and the respective iron cores are integrated and magnetically coupled by the fixtures 44 and 46. in this way,
The second volume core 22 is arranged so as to overlap the lower half of the first volume core 12, and has the function of magnetically saturating a portion of the first saturable core. The input winding 18, the output winding 20, and the control winding 24 are connected to the first to third core portions 1 of the center leg 26, respectively.
2a, 12b, and 12c and are arranged substantially in the same plane. Furthermore, the upper surface and the lower surface of each winding are arranged so as to be aligned with the upper surface of the second-volume core 22 and the lower surface of the first-volume core 12, respectively. That is, a coil block consisting of an input winding 18, an output winding 20, and a control winding 24.
The coil block is located approximately within the thickness of the center leg 26 and the first and second cores 12,22. Third core part 12C of center leg 26
extends outside the first core 12, and the control winding 24 is wound on the lower end 12c of the center leg 26. A second core 22 surrounds the output winding 20 coil block and the control winding 24 coil block. In Figures 2 and 3, the upper and lower parts of the second volume core 22 are fixed by fixtures 44 and 46, respectively.
This constitutes an auxiliary magnetic flux loop path together with the center leg 26, and functions as a path for the magnetic flux of the control winding 24 when a DC control current is supplied to the control winding 24. That is, the magnetic flux of the control winding 24 partially magnetically saturates the second core portion 12b of the center leg 26, and the magnetic flux of the input winding 18 is also transferred from the main magnetic flux loop path to the outer magnetic shunt core 14.・Shift to legs 28 and 30.

In FIGS. 1 and 2, when no DC control current is supplied to the control winding 24, the magnetic flux generated by the input winding 18 passes from the center leg 26 to the outer legs 28, 30. circulate to. At this time, the magnetic flux generated by the input winding 18 interlinks with the output winding 20 and generates an induced voltage in the output winding 20.

Next, connect the control winding 24 to a DC power source (not shown).
to the center via the second volume iron core 22.
When the second and third core portions 12b and 12c of the leg 26 are magnetically saturated, the input winding 16 and the shunt winding 18
The resulting magnetic flux is shifted to the magnetic shunt core 14. At this time, the magnetic flux circulates through the first core portion 12a, the outer legs 28, 30, and the magnetic shunt core 14, and the magnetic flux interlinking with the output winding 20 decreases, so that the output of the output winding 20 is reduced. The voltage will be lower. When the DC current supplied to the control winding 24 is reduced, the output voltage is reduced accordingly. In this way, by variably controlling the magnetic saturation states of the second and third core portions 12b and 12c of the center leg 26, the magnetic flux of the input winding 18 shifted to the magnetic shunt core 14 is controlled, and the output The output voltage of the winding 20 can be variably controlled.

〔Effect of the invention〕

As is clear from the above, the magnetic amplifier according to the present invention provides the following effects.

In the magnetic amplifier of the present invention, it is possible to employ a single control winding and each winding core and each winding are arranged in the same plane, so that the magnetic amplifier can be made ultra-thin and compact. Furthermore, since the center leg and each winding core are integrated with a fixing device, manufacturing and assembly are easy. Furthermore, since a magnetic shunt is provided in the main magnetic flux loop path via an air gap, harmonics are attenuated and waveform distortion of the output voltage is improved.

[Brief explanation of drawings]

FIG. 1 is a wiring diagram of a preferred embodiment of the magnetic amplifier according to the present invention, FIG. 2 is a plan view of the magnetic amplifier of FIG. 1, FIG. 3 is a right side view of the magnetic amplifier of FIG. 2, and FIG. FIG. 2 shows a bottom view of the magnetic amplifier, and FIG. 5 shows a sectional view taken along the - line in FIG. 2, respectively. 12...First volume iron core, 18...Input winding, 20
... Output winding, 22 ... Second volume iron core, 24 ... Control winding, 26 ... Center leg, 28, 30
...Outer Retsugu.

Claims (1)

[Scope of Claims] 1. A main magnetic flux loop path including a first saturable iron core having an input winding and an output winding, and a main magnetic flux loop path disposed between the input winding and the output winding to at least one magnetic shunt core with an air gap for bypassing a portion of the loop path; and a portion of the first saturable core and an extension thereof between the magnetic shunt core and the output winding. an auxiliary magnetic flux loop path having a second saturable core magnetically coupled to the first saturable core; a control winding for magnetically saturating the portion of the saturable core to shift the magnetic flux of the input winding to the magnetic shunt core. 2. The first saturable core includes a first volume core having a center leg and an outer leg, and the auxiliary magnetic flux loop path surrounds the output winding and the control winding on the center leg. 2. A magnetic amplifier according to claim 1, further comprising a second volume core arranged in the center leg, said center leg having said extension portion extending outwardly from said first volume core. 3, further comprising a first fixture for fixing the first volume core and the center leg, and a second fixture for fixing the second volume core and the center leg. A magnetic amplifier according to claim 2. 4. On one side of the center leg, the first
4. The magnetic amplifier according to claim 2, wherein a wound core is disposed, and the second wound core is disposed on the other side of the center leg. 5. The magnetic amplifier according to claim 4, wherein the input winding, the output winding, and the control winding are arranged in substantially the same plane. 6. Claims characterized in that the input winding, the output winding, and the control winding are arranged substantially within the thickness of the center leg and the first and second cores. The magnetic amplifier according to item 5.