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Small, light and thin
In 1978, the development of R-core, non-cut winded core with circular cross section, was successfully completed and mass production was stated for the first time in the world. Patent of it was registered in many countries.
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Since then, small and high performance R-core transformer has been
adopted to audio devices, OA machines, communication devices and medical
instruments as an idealistic power source by many large assembly makers.
The number of users is still increasing rapidly. As it satisfies safety
standard of many countries, R-core transformer is the best selection
for a transformer used in the product intended to put in the worldwide
market.
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The leakage
flux (flux leaked out of transformer) of R-core transformer is less
than 1/10 of EI transformer. The structure designed and manufactured
using KITAMURA's knowledge and skill confines flux generated at
both of right and left coils into the iron core and does not allow
the flux to come out. As R-core does not have any cutting face,
the magnetic resistance won't appear, then the characteristic of
silicon steel board can be utilized to the full. Its circular cross
section and the shape of core eliminate the concentration of magnetism
at point angles. Therefor placing any leakage protection means at
assembly process is not required. Adopting R-core transformer is
effective not only in audio equipment but also in visual equipment
to prevent flickering and tremor of a screen, in medical equipment
and in robot to prevent malfunctions.
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Type
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A
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B
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C
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q-Core transformer
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10
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20
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20
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dh-Transformer
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250
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80
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250
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R-core
transformer is installed in various kinds of equipment and more than
30 million systems have been exported. The separate type bobbin is
used to satisfy safety standards on spatial creeping distance, insulation
and proof pressure, of many countries. As we have the family corresponding
to UL1411, customers can reduce time and cost for applying for UL
and CSA largely. And more we have acquired other safety standard such
as electrical appliances safety standard, IEC and EN standard. |
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R-core transformer
comprises 2 coils. The left drawing shows a cross section of one
coil. From the center, core (silicon steal), first bobbin (plastic),
first coil (copper), second bobbin (plastic), second coil (copper).
The insulation structure is formed with laminating metal and plastic
alternately.
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As
R-core transformer can stand overload fluctuation, stability and reliability
of equipment are increased. Though small and light, R-core transformer
has a characteristic that it is an internal iron type and having larger
surface area. As the heat accumulated in an instant at overload is
radiated immediately, R-core transformer can stand frequent overload.
And as it has good response to momentary large current, it shows great
characteristic when used in audio equipment.
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The
heat generation caused by iron loss in R-core transformer is less
than 1/2 compared with that in EI transformer. To attain this characteristic,
high-grade silicon steal board made by SHINN-NITTETSU is used for
the core of R-core transformer. As high- B material whose iron loss
is small is used and R-core does not have any cutting faces, R-core
transformer is a transformer that requires little holding power and
produces very little noise.
The structure of R-core transformer is very simple and high-grade
materials are used. As non-cut winding iron core is applied, there
is no magnetic gap. This is the low power consumption transformer
that has few iron loss, because of having circular cross section iron
core, generates little magnetization current and little heat. This
character is effective at energy saving in the stand-by state.
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R-core
transformer is the combination of winding iron core and bobbin winding,
and it has a very simple structure. As assembling of iron core is
not required, hard iron (core) won't hart soft copper (winding). And
also, a bobbin decides the space for winding, in house developed winding
machine realized well- regulated winding. In house developed manufacturing
facility produces transformers having almost same characteristics,
high quality and high- reliability. The characteristics of small and
light increase the flexibility of installing place. These characteristics,
with small heat generation and minimized leakage, will reduce the
cost and space for heat radiation measures and magnetism proof measures,
then R-core transformer is effective for total cost down. |
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Core size
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A
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W
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X
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Capacity(VA)
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Weight(kg)
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super thin series |
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R7
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71
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84
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35
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7`10
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0.3
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R10
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75
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61
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37
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10`20
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0.4
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R15
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78
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64
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38
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15`20
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0.4
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R20
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82
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70
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40
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20`30
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0.5
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R25F
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85
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72
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43
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25`40
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0.6
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R30
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97
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77
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42
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30`45
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0.7
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R35
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100
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84
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46
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35`50
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0.9
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R40
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99
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80
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44
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35`55
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0.9
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R50
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102
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85
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48
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50`70
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1.0
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R80
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125
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90
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52
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70`100
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1.4
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R120
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126
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103
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55
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100`130
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1.7
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R150
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149
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104
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56
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130`150
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2.4
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R160
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140
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115
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63
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150`200
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2.6
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R260
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160
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121
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66
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200`280
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3.1
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R320
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163
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128
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70
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280`340
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3.8
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R600
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190
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145
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83
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340`600
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6.5
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R800
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204
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170
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93
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600`800
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9.0
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R1000
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227
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172
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95
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800`1100
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10.5
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| @ |
standard series |
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R18D
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81
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75
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36
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18`25
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0.4
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R20D
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82
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80
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39
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20`35
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0.5
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R25D
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85
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80
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42
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25`40
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0.6
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R80D
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131
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83
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49
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70`100
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1.3
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Fixing dimensions, outer dimensions and weights are reference
values. |
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As for the
detail, please ask to our sales department before designing.
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If you need
custom-made products, please ask to our sales department before
designing.
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This
specification may be altered for improvement without prior notifications. |
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Audio equipment
Performance of a transformer plays very important part in reproduction
of pure sounds. R-core transformer, as adopting non-cut core with
circular cutting face, having very small leakage flux, vibration and
high power response. Distortion that appears at power supply and magnetic
influence on audio circuit, are eliminated. Its smooth and clear mid
and high range, and rich low range are highly evaluated. R-core transformer
having excellent characteristics satisfies safety standards in many
countries, and many audio equipment makers all over the world adopt
it.
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cuc
Player |
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High picture quality and high sound quality are required for DVD player.
As minute signals are used in the amplifier circuit, a leakage flux
from power transformer degenerates quality of picture and sound, as
a harmful noise. R-core transformer is the best choice for eliminating
bad influences and supplying stable power without leakage flux to
each circuit. |
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Power
amplifier, pre-main amplifier, AV amplifier |
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Power transformer for amplifiers has to have high performance to correspond
to requirement of amplified power supply. However, leakage flux becomes
noise source and degenerates sound quality when large current is passed.
In R-core transformer, coil is wound tightly on a non-cot core with
circular cross section, uniform fluxes are formed and minimized leakage
is realized. The shape of core realizes quicker heat radiation compared
with accumulation of heat at overload. This transformer can handle
frequent overloads.
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CD
player, MD player, mini-component stereo system, radio cassette player |
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As small
size and lightweight are required for these products, each part is
arranged very closely. Then leakage flux, heat generation and vibration
of a power transformer are always a problem. R-core transformer, having
characteristics of light, thin, short, small, requiring no leakage
proof measure and generating small heat, is the best choice for composing
small and high performance equipment. |
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Super
woofer |
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Adopting
of R-core transformer enabled home theater & music system to
have stylish form and high quality sound reproduction. The characteristics
of very small leakage flux, one of the most important characteristics
of R-core transformer, eliminates degeneration of sound caused by
interference to each unit and composing of system having high-end
quality is enabled.
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R-core transformer
have the structure that bobbin insulates between the first winding
and iron core. As it is circular winding no distortion is given to
power source, and having high stability. Different from EI core, it
does not need core-filling step, winding, insulation and iron core
won't be damaged. These characteristics are especially effective installed
in devices require safety and reliability such as medical or measuring
equipment. As this transformer is small, thin and light, setting area
is reduced and enables cost reduction of chassis or housing. R-core
transformer is the best choice for safty, reliability and total cost
reduction.
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R-core
transformer having non-cut core with circular cross section does not
have leakage of magnetism caused by concentration of magnetism on
point angles. Then a power transformer can be placed close to a display
unit without setting counter leakage measures between them. Flickering
and tremor of image are eliminated. R-core transformer having characteristics
of small, light and thin is the best choice for all equipment having
a monitor. |
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