【０００１】[0001]
【発明の属する技術分野】本発明は、機械において回転
体の種々の物理量を検出するため、回転体に置かれた回
路に電力を供給する変圧器（インダクタンス）の構造に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a transformer (inductance) for supplying power to a circuit placed on a rotating body in order to detect various physical quantities of the rotating body in a machine.
【０００２】[0002]
【従来の技術】回転体の種々の物理量を検出するうえ
で、固定側から回転体に置かれた検出器や回路に直接配
線できないという障害がある。回転体に電力を供給する
公知の方法では、図１に示すスリップリング機構や、図
２及び図３に示す回転トランスなどがある。スリップリ
ング機構は長期に亘りブラシとスリップリングの機械的
接触を良好に保つため、精密な工作，組立が必要であ
り、スリップリングやブラシからの漏電を防ぐ絶縁，物
が触れて接触事故を起こさないようにケースに入れるこ
と，ブラシが摩耗するため定期的に部品の交換や保守が
必要である。これに対し、回転トランスでは電磁誘導を
用いるため交流変換回路が必要であるが、非接触のため
接触不良は発生せず、絶縁は容易で、保守は不要であ
る。特に、回転トランスを回転体の端面の回転中心に設
置した図２の方式は、小型のもので電力供給が可能で有
効な手段である。図３の方式は図２のものと機能は同じ
であるが、機械の回転軸の外周に取り付ける点が異な
る。2. Description of the Related Art In detecting various physical quantities of a rotating body, there is an obstacle that it is not possible to directly wire a detector or a circuit placed on the rotating body from a fixed side. Known methods for supplying power to the rotating body include a slip ring mechanism shown in FIG. 1 and a rotary transformer shown in FIGS. 2 and 3. The slip ring mechanism requires precise work and assembly to maintain good mechanical contact between the brush and the slip ring for a long period of time. The parts need to be replaced and maintained regularly because they are worn in a case and the brushes are worn. On the other hand, a rotary transformer requires an AC conversion circuit because of the use of electromagnetic induction. However, since it is non-contact, no contact failure occurs, insulation is easy, and maintenance is unnecessary. In particular, the system shown in FIG. 2 in which the rotary transformer is installed at the center of rotation of the end face of the rotary body is an effective means that is small and can supply power. The method of FIG. 3 has the same function as that of FIG. 2, except that it is mounted on the outer periphery of the rotating shaft of the machine.
【０００３】[0003]
【発明が解決しようとする課題】回転トランスで回転体
の端面の中心部に設置する方式（図２）は、取り付けは
比較的容易であるが、取り付ける空間がない場合や取り
付けることが困難な場合などがあり、全てには適用でき
ない。一方、機械の回転軸の外周に取り付ける方式（図
３）では、鉄心が１次コイル及び２次コイルを全面的に
被う外鉄形変圧器の構造になっているため、回転軸の径
が大きくなるとそれに応じて鉄心の径も増大し、製作費
の増大を招く傾向がある。そこで、本発明は機械の回転
軸の外周に取り付ける公知の方式において、回転軸によ
り鉄心の製作費が増大し、製作が困難になることを解決
する。The method of installing the rotating transformer at the center of the end face of the rotating body (FIG. 2) is relatively easy to install, but when there is no space to install or when it is difficult to install. And so on, not applicable to all. On the other hand, in the method of attaching to the outer periphery of the rotating shaft of the machine (FIG. 3), since the iron core has a structure of a shell-type transformer that entirely covers the primary coil and the secondary coil, the diameter of the rotating shaft is reduced. As the diameter increases, the diameter of the iron core also increases, which tends to increase the manufacturing cost. In view of the above, the present invention solves the problem of increasing the manufacturing cost of the iron core due to the rotating shaft and making it difficult in the known method of mounting the core around the rotating shaft of the machine.
【０００４】[0004]
【課題を解決する手段】変圧器の鉄心に巻くコイルの巻
き方を緩くし、このコイルと鉄心の間に遊びを作れば、
鉄心に対するコイルの動きの自由度は増す。これを利用
してコイルが回転できるようにすれば、電磁誘導により
回転体への電力供給が実現できる。内鉄形の鉄心を用い
た変圧器で、２次コイルが回転体と共に回転できるよう
に、２次コイルを回転体の回転の軸を中心とし、この鉄
心の枠の中を通して円形に巻く。この鉄心には１次コイ
ルが巻かれ、また、２次コイルを前記の回転体から支持
するプレート及び２次コイルのリード線が通過するため
の間隙が設けられる。この変圧器において、鉄心及び１
次コイルを固定側に置き、２次コイルを回転体と共に回
転させ、回転体に置かれた回路に電力を供給する。Means for Solving the Problems If the winding of the coil wound around the iron core of the transformer is loosened and play is created between this coil and the iron core,
The freedom of movement of the coil relative to the iron core is increased. If the coil can be rotated using this, power can be supplied to the rotating body by electromagnetic induction. In a transformer using an inner iron core, the secondary coil is wound around the axis of rotation of the rotating body in a circular shape through the core frame so that the secondary coil can rotate together with the rotating body. The iron core is wound with a primary coil, and a plate for supporting the secondary coil from the rotating body and a gap through which a lead wire of the secondary coil passes are provided. In this transformer, an iron core and one
The secondary coil is placed on the fixed side, the secondary coil is rotated together with the rotating body, and power is supplied to a circuit placed on the rotating body.
【０００５】[0005]
【発明の実施の形態】回転体への電力供給用変圧器の一
般的な使用目的は、機械の回転している箇所でトルクや
温度など各種の物理量を検出するため、検出器や送信器
など回転する箇所に置く回路に非接触で電力を供給する
ことである。図４はこの変圧器の構造の概略と、代表的
な取り付けの例である。図５はこれを図４のＸＸ方向か
ら見たものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A general purpose of a transformer for supplying electric power to a rotating body is to detect various physical quantities such as torque and temperature at a rotating portion of a machine. It is to supply electric power to a circuit placed in a rotating place in a non-contact manner. FIG. 4 shows an outline of the structure of this transformer and an example of a typical installation. FIG. 5 shows this as viewed from the direction XX in FIG.
【０００６】機械の回転軸（９）に、変圧器の２次コイ
ル（５）を支持するプレート（８）と回転側の回路を取
り付ける回転板（10）を取り付ける。回転板（10）には
金属板を使用し、磁気遮蔽を行うことができる。これら
の物理的な回転の軸を（１）とする。変圧器の鉄心
（４）は内鉄形を用い、これに１次コイル（２）を巻
く。また、鉄心（４）に間隙（７）を設け、２次コイル
（５）が回転する際にプレート（８）と２次コイルのリ
ード線（６）が通過できるようにする。プレート（８）
は鉄心（４）の間隙（７）を横切るので、電磁誘導によ
る損失を少なくするため、材質は固体絶縁物や、金属を
用いた場合でも電磁誘導を受け難い構造のものとする。
２次コイル（５）は回転の軸（１）を中心とし、鉄心
（４）の枠の中を通して円形に巻く。この変圧器で、鉄
心（４）及び１次コイル（２）を機械等の固定側に置
き、２次コイル（５）を機械の回転軸（９）及び回転板
（10）と一体で回転させる。A plate (8) for supporting the secondary coil (5) of the transformer and a rotating plate (10) for attaching a circuit on the rotating side are attached to the rotating shaft (9) of the machine. A metal plate can be used for the rotating plate (10) to provide magnetic shielding. The axis of these physical rotations is (1). The core (4) of the transformer is of a core type, and the primary coil (2) is wound around it. A gap (7) is provided in the iron core (4) so that the plate (8) and the lead wire (6) of the secondary coil can pass when the secondary coil (5) rotates. Plate (8)
Since the material crosses the gap (7) of the iron core (4), in order to reduce the loss due to electromagnetic induction, the material is made of a structure that is hardly susceptible to electromagnetic induction even when a solid insulator or metal is used.
The secondary coil (5) is wound circularly around the axis of rotation (1) and through the frame of the iron core (4). With this transformer, the iron core (4) and the primary coil (2) are placed on a fixed side of a machine or the like, and the secondary coil (5) is rotated integrally with the rotating shaft (9) and the rotating plate (10) of the machine. .
【０００７】電力供給の原理は一般の変圧器と同様であ
る。１次コイルのリード線（３）に交流電圧を加えると
１次コイル（２）により鉄心（４）に発生した磁束が２
次コイル（５）と鎖交とし、２次コイルのリード線
（６）に交流電圧が発生し、１次コイル（２）から２次
コイル（５）へ電力を供給できる。１次コイル（２）に
加える電圧は、スイッチング電源の一方式であるフライ
バック式コンバータのように、高速で直流電圧をオンオ
フする方法でも良い。回転体への電力供給用変圧器で
は、２次コイル（５）はその回転に関係なく鉄心（４）
の同じ位置を通過するので、磁気回路的に同じ条件、即
ち一定の効率で電力を供給することができる。The principle of power supply is the same as that of a general transformer. When an AC voltage is applied to the lead wire (3) of the primary coil, the magnetic flux generated in the iron core (4) by the primary coil (2) becomes 2
The secondary coil (5) is linked, and an AC voltage is generated on the lead wire (6) of the secondary coil, so that electric power can be supplied from the primary coil (2) to the secondary coil (5). The voltage applied to the primary coil (2) may be a method of turning on and off a DC voltage at a high speed, such as a flyback converter, which is a type of switching power supply. In a transformer for supplying electric power to a rotating body, the secondary coil (5) has an iron core (4) regardless of its rotation.
, The power can be supplied under the same conditions as the magnetic circuit, that is, with constant efficiency.
【０００８】[0008]
【実施例】回転軸のトルク検出における実施回路の概略
を図６に示す。概略は、機械の回転軸（９）に貼られた
歪ゲージのブリッジ回路（Ｆ）の電位差（f1）によりこ
の箇所のトルクを検出し、増幅回路（Ｇ）で増幅し、変
調回路（Ｈ）でパルス幅変調によるオンオフ信号に変換
し、これにより赤外ＬＥＤ（Ｉ）を点滅し、光による信
号を送信する。これを固定側のフォトダイオード（Ｊ）
で受光して電気信号に変換し、増幅回路（Ｋ）で増幅
し、復調回路（Ｌ）でアナログ信号に変換し、検出信号
（l1）を得る。固定側（Ａ，Ｂ）から回転側の回路
（Ｄ，Ｅ，Ｆ，Ｇ，Ｈ，Ｉ）への電力の供給はスイッチ
ング回路（Ｂ）及び回転体への電力供給用変圧器（Ｃ）
により行う。FIG. 6 schematically shows an embodiment of a circuit for detecting the torque of a rotating shaft. In general, the torque at this point is detected by the potential difference (f1) of the bridge circuit (F) of the strain gauge attached to the rotating shaft (9) of the machine, amplified by the amplifier circuit (G), and amplified by the modulation circuit (H). To convert the signal into an on / off signal by pulse width modulation, whereby the infrared LED (I) is turned on and off, and a signal based on light is transmitted. This is fixed photodiode (J)
The light is converted into an electric signal by the amplifier, amplified by an amplifier circuit (K), converted into an analog signal by a demodulator circuit (L), and a detection signal (11) is obtained. The supply of power from the fixed side (A, B) to the circuit on the rotating side (D, E, F, G, H, I) is performed by a switching circuit (B) and a transformer for supplying power to the rotating body (C).
Performed by
【０００９】鉄心（４）は枠の外側の寸法が縦35mm×横
25mm×厚10mm，枠の断面 5mm×10mmのフェライト製コア
を用い、幅 4mmの間隙（７）を設け、これに被覆導線を
45回巻き、１次コイル（２）とした。２次コイル（５）
は被覆導線を45回巻き、直径60mm，断面直径 5mmの環状
のコイルとした。機械の回転軸（９）の材質は軟鋼で、
直径12mmである。これに磁気遮蔽を兼ねてアルミニウム
製の回転板（10）を取り付け、回転板（10）から20mm離
して２次コイル（５）を塩化ビニル製のプレート（８）
で支持し、また、回転板（10）の２次コイル（５）と反
対側の面に回路（Ｄ，Ｅ，Ｆ，Ｇ，Ｈ，Ｉ）を設置し
た。この際に２次コイル（５）は、間隙（７）からの漏
洩磁束の影響を受けないように、間隙（７）の位置から
できるだけ離した。[0009] The outer dimension of the frame of the iron core (4) is 35 mm long and wide.
Using a ferrite core of 25 mm x 10 mm, cross section of frame 5 mm x 10 mm, a gap (7) with a width of 4 mm is provided, and a covered conductor is inserted into this gap.
The primary coil (2) was wound 45 times. Secondary coil (5)
Was made into an annular coil with a diameter of 60 mm and a cross-sectional diameter of 5 mm by winding a covered wire 45 times. The material of the rotating shaft (9) of the machine is mild steel,
It is 12 mm in diameter. A rotating plate (10) made of aluminum is also attached to this as a magnetic shield, and the secondary coil (5) is placed at a distance of 20 mm from the rotating plate (10), and a plate (8) made of vinyl chloride.
The circuit (D, E, F, G, H, I) was installed on the surface of the rotating plate (10) opposite to the secondary coil (5). At this time, the secondary coil (5) was separated from the position of the gap (7) as much as possible so as not to be affected by the leakage magnetic flux from the gap (7).
【００１０】電力供給の動作の概略は次の通りである。
スイッチング回路（Ｂ）のクロック（b2）は周波数30kH
zでオンとオフの各時間が等しく発振し、トランジスタ
（b3）をオンオフする。トランジスタ（b3）がオンにな
ると、直流電源（Ａ）の＋極から１次コイル（２）を通
って直流電源（Ａ）の−極に流れる電流が増加に転じ
る。この時、２次コイル（５）に電磁誘導による電圧が
発生するが、整流回路（Ｄ）のダイオード（d1）に阻止
され電流は流れない。次にトランジスタ（b3）がオフに
なると、１次コイル（２）に蓄積された電磁エネルギに
より１次コイル（２）とコンデンサ（b5）の間に電気振
動が起きる。この時、コンデンサ（b5）にトランジスタ
（b3）側を＋として充電が行われ、同時に１次コイル
（２）の電流は減少し、２次コイル（５）からダイオー
ド（d1）の順方向に流れる電流が発生し、コンデンサ(d
2)を充電する。さらに、コンデンサ（b5）の充電が終了
し最大電圧になると、次にコンデンサ（b5）のトランジ
スタ（b3）側から１次コイル（２）を経て直流電源
（Ａ）の＋極側に放電する電流が流れ、これにより２次
コイル（５）からダイオード（d1）の順方向に流れる電
流が発生し、コンデンサ（d2）を充電する。これら一連
のサイクルを繰り返し、回転体への電力供給用変圧器
（Ｃ）を介して直流電源（Ａ）から整流回路（Ｄ）のコ
ンデンサ（d2）に電力が供給され、このコンデンサ（d
2）の出力（d3）を電源として回転側の回路（Ｅ，Ｆ，
Ｇ，Ｈ，Ｉ）が動作する。The outline of the operation of power supply is as follows.
The clock (b2) of the switching circuit (B) has a frequency of 30 kHz.
At z, the on and off times oscillate equally, turning on / off the transistor (b3). When the transistor (b3) is turned on, the current flowing from the positive pole of the DC power supply (A) to the negative pole of the DC power supply (A) through the primary coil (2) starts to increase. At this time, a voltage is generated in the secondary coil (5) by electromagnetic induction, but is blocked by the diode (d1) of the rectifier circuit (D) and no current flows. Next, when the transistor (b3) is turned off, electric vibration occurs between the primary coil (2) and the capacitor (b5) due to the electromagnetic energy stored in the primary coil (2). At this time, the capacitor (b5) is charged by setting the transistor (b3) side to +, and at the same time, the current of the primary coil (2) decreases and flows from the secondary coil (5) in the forward direction of the diode (d1). A current is generated and the capacitor (d
2) Charge. Further, when the charging of the capacitor (b5) is completed and reaches the maximum voltage, the current discharged from the transistor (b3) side of the capacitor (b5) to the positive electrode side of the DC power supply (A) through the primary coil (2). Flows, thereby generating a current flowing from the secondary coil (5) to the diode (d1) in the forward direction, and charges the capacitor (d2). These series of cycles are repeated, and power is supplied from the DC power supply (A) to the capacitor (d2) of the rectifier circuit (D) via the transformer (C) for supplying power to the rotating body.
Using the output (d3) of 2) as a power supply, the circuit (E, F,
G, H, I) operate.
【００１１】安定化回路（Ｅ）は、整流出力（d3）の電
圧を僅かに降下させ、安定化出力（e1）の電圧を一定に
保つ役割をする。コンデンサ（b5）の容量は0.2μFであ
る。また、歪ゲージのブリッジ回路（Ｆ）に用いた４枚
の歪ゲージの抵抗値は何れも350Ωである。スイッチン
グ回路（Ｂ）の入力電圧（b1）を10Ｖとし、整流出力
（d3）の出力電流を70mA前後に保つように制御し、この
条件で整流出力（d3）の電圧は13Ｖとなり、また、回転
体への電力供給用変圧器（Ｃ）による電力供給効率は約
60％となった。The stabilizing circuit (E) slightly lowers the voltage of the rectified output (d3) and keeps the voltage of the stabilized output (e1) constant. The capacitance of the capacitor (b5) is 0.2 μF. The resistance values of the four strain gauges used in the bridge circuit (F) of the strain gauges are all 350Ω. The input voltage (b1) of the switching circuit (B) is set to 10 V, and the output current of the rectified output (d3) is controlled to be around 70 mA. Under this condition, the voltage of the rectified output (d3) becomes 13 V. The power supply efficiency of the transformer (C) for supplying power to the body is approximately
60%.
【００１２】[0012]
【発明の効果】発明した回転体への電力供給用変圧器
は、公知の回転トランスで回転軸の外周に取り付ける方
式の持つ欠点、すなわち回転軸の径が大きくなると鉄心
の径が増大し、これにより鉄心の製作費が大きくなり、
或いは製作が困難になるという点を解決する。これは、
公知の回転トランスが外鉄形の鉄心により１次コイル及
び２次コイルを全体的に被う構造であるのに対し、発明
した回転体への電力供給用変圧器では内鉄形の鉄心を用
い、鉄心が１次コイルと２次コイルを連結する構造であ
り、このため回転軸の径によって変化するのは２次コイ
ルの径のみで、鉄心の形状や大きさは変化せず、従って
鉄心の製作費が大きくなったり、製作が困難になること
はないからである。また、公知の回転トランスの持つ長
所の非接触で電力の供給ができる点、電気的絶縁が容易
で保守が不要という点は失われない。発明した変圧器の
取り付けは、理論的にこの鉄心の枠の中を２次コイルが
通っておれば性能を発揮できるので、取り付けにあたっ
て精密な工作や取り付けは必要とせず、簡易的な扱いが
できる。これにより、従来、各種設備や試験装置で回転
トランスの利用範囲が限定されていたものを、低廉に且
つ簡易にすることにより、民生用機器にも適用範囲を広
げる事が可能となる。The transformer for supplying electric power to the rotating body according to the invention is disadvantageous in that the transformer is mounted on the outer periphery of the rotating shaft with a known rotating transformer, that is, as the diameter of the rotating shaft increases, the diameter of the iron core increases. This increases the cost of manufacturing the iron core,
Or, it solves the point that production becomes difficult. this is,
While the known rotary transformer has a structure in which the primary coil and the secondary coil are entirely covered by an outer iron core, the transformer for supplying power to the rotating body invented uses an inner iron core. The core has a structure that connects the primary coil and the secondary coil. Therefore, only the diameter of the secondary coil changes with the diameter of the rotating shaft, and the shape and size of the core do not change. This is because the production cost does not increase or the production becomes difficult. In addition, the advantages of the known rotary transformer that power can be supplied in a non-contact manner and that electrical insulation is easy and maintenance is unnecessary are not lost. The installation of the invented transformer can theoretically exhibit its performance if the secondary coil passes through the frame of the iron core, so it does not require precise work or installation, and can be handled easily. . This makes it possible to expand the range of applications to consumer equipment by simplifying the range of use of the rotary transformer in various facilities and test apparatuses at low cost and simplicity.
【図１】トルク検出におけるスリップリング機構の使用
例の概略図。FIG. 1 is a schematic diagram of a usage example of a slip ring mechanism in torque detection.
【図２】回転体の端面の回転中心に取り付ける方式の回
転トランスの概略図、鉄心のコア及びコイルは回転の軸
を通る破断面を示す。FIG. 2 is a schematic view of a rotary transformer of a type mounted on a rotation center of an end face of a rotary body, in which a core and a coil of an iron core show a fractured surface passing through a rotation axis.
【図３】回転軸の外周に取り付ける方式の回転トランス
の概略図、鉄心のコア及びコイルは回転の軸を通る破断
面で示す。FIG. 3 is a schematic view of a rotary transformer of a type mounted on the outer periphery of a rotary shaft, in which a core and a coil of an iron core are shown by a broken surface passing through a rotary shaft.
【図４】回転体への電力供給用変圧器の取り付けの例を
示す図面、２次コイル（５），プレート（８），回転板
（10）は回転の軸を通る断面で示す。FIG. 4 is a drawing showing an example of mounting a power supply transformer on a rotating body, in which a secondary coil (5), a plate (8), and a rotating plate (10) are shown in a cross section passing through the axis of rotation.
【図５】図４をＸＸの方向から見た図面である。FIG. 5 is a drawing in which FIG. 4 is viewed from a direction XX.
【図６】回転体への電力供給用変圧器を、回転軸のトル
ク検出における電力供給に応用した例の回路のブロック
図である。FIG. 6 is a block diagram of a circuit in which a transformer for supplying power to a rotating body is applied to power supply in torque detection of a rotating shaft.
１ 物理的な回転の軸、 ２ １次コイル、３
１次コイルのリード線、４ 鉄心、
５ ２次コイル、６ ２次コイルのリード線、
７ 間隙、８ プレート、９ 機械の回転軸、
10 回転板、Ａ 直流電源、
Ｂ スイッチング回路、b1 スイッチング回路の入
力、 b2 クロック、b3 トランジスタ、
b4 ダイオード、b5 コンデンサ、Ｃ 回転体への
電力供給用変圧器、Ｄ 整流回路、d1 ダイオード、
d2 コンデンサ、d3 整流回路の出力、Ｅ 安
定化回路、 e1 安定化回路の出力、Ｆ ４枚
の歪ゲージによるブリッジ回路、f1 電位差、Ｇ 増幅
回路、 Ｈ 変調回路、Ｉ 赤外ＬＥ
Ｄ、 Ｊ フォトダイオード、Ｋ 増幅回
路、Ｌ 復調回路、 l1 検出信号1 axis of physical rotation, 2 primary coil, 3
Primary coil lead wire, 4 iron core,
5 secondary coil, 6 secondary coil lead wire,
7 gap, 8 plate, 9 machine axis of rotation,
10 rotating plate, A DC power supply,
B switching circuit, b1 switching circuit input, b2 clock, b3 transistor,
b4 diode, b5 capacitor, transformer for supplying power to C rotating body, D rectifier circuit, d1 diode,
d2 capacitor, d3 rectifier circuit output, E stabilization circuit, e1 stabilization circuit output, F bridge circuit with four strain gauges, f1 potential difference, G amplifier circuit, H modulator circuit, I infrared LE
D, J photodiode, K amplification circuit, L demodulation circuit, l1 detection signal
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10230375AJP2000058355A (en) | 1998-08-17 | 1998-08-17 | Transformer for power supply to rotating body |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10230375AJP2000058355A (en) | 1998-08-17 | 1998-08-17 | Transformer for power supply to rotating body |
| Publication Number | Publication Date |
|---|---|
| JP2000058355Atrue JP2000058355A (en) | 2000-02-25 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10230375AWithdrawnJP2000058355A (en) | 1998-08-17 | 1998-08-17 | Transformer for power supply to rotating body |
| Country | Link |
|---|---|
| JP (1) | JP2000058355A (en) |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination | Free format text:JAPANESE INTERMEDIATE CODE: A300 Effective date:20051101 |