JPS60138417A - Rotary type position detecting device utilizing electromagnetic induction - Google Patents

Abstract

PURPOSE:To use a titled device for a machine which rotates at a high speed, too, by cutting a groove for setting a wiring from a detecting coil, on a rotor which is set opposingly at a small interval against a stator, and piercing a hole at a position opposed to the groove. CONSTITUTION:A coil pattern 14 is formed on a surface 121 of a rotor 12 opposed to a stator by holding a prescribed interval. Subsequently, a rotary transformer 16 is buried and set, and also a wiring groove 17 is formed. Also, in this wiring groove 17, an electric wire 18 is made to pass through, and the pattern 14 and the transformer 16 are connected. A balance hole 21 is pierced in the circumferential part of the opposite side opposed to the wiring groove 17 by placing a center shaft between them. Also, a weight balance of the rotor 12 is equalizied in the outside circumferential part centering around the center shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary position detection device that uses electromagnetic induction to electromagnetically detect the mutual rotational angular position of a stator and rotor. - An example of an electromagnetic induction rotary position detection device is known as Rotary Inductosin (trade name). As shown in FIG. 1, this detection device is composed of a disc-shaped stator jl and a disc-shaped rotor 12 facing the stator jl at a constant distance.

Opposing surfaces Jh of these stator IJ and rotor 12
and 12 and 1 are respectively set radially by wiring such as copper foil to form a circuit, which is connected in a zigzag pattern to form concentric coil leans 13 and 14. Further, rotary induction coils 15 and 16 are buried in a state of facing each other so as to be concentric with the coil patterns 13 and 14, respectively, so that the induction detection signal from the coil pattern 14 on the rotor 12 side can be detected. The transformer 16 is coupled to the transformer 15, and its detection signal is derived from the stator unit side.

In this case, there are grooves 1 on the opposite pattern surface 122 of the rotor 12.
71 and holes 172 and 123 bored between the pattern 14 and the transformer 16 form a wiring groove between the pattern 14 and the transformer 16. That is, the pattern 14 and the transformer 16 are connected to each other by passing the electric wire 18 through this wiring groove L.

In such a detection device, pattern 1 of the stator 11
When an alternating current is passed through 3, the opposite rotor
An alternating current voltage is induced in the turn 14. This induced voltage is supplied to the transformer 16 by the electric wire 18 housed in the wiring groove H, and is transmitted to the transformer 15 of the stator H and detected.

In this case, the voltage induced in the pattern 14 of the rotor 12 changes in magnitude depending on the displacement of the rotor U, so by detecting the electric signal corresponding to the displacement of the rotor 12, the amount of displacement of the rotor υ can be determined. In other words, the rotation angle can be increased.

However, in such a detection device, when the rotor H is rotated at high speed, the dynamic balance is lost due to the wiring groove J, and vibrations occur. Therefore, it has been difficult to use it in machines that rotate at high speed.

This invention was made to solve the above-mentioned problems, and includes a stator in which a current coil glossy turn is formed concentrically, and a coil pattern that is set opposite to the stator at a small interval and faces the above-mentioned coil pattern. A rotor is provided with a rotor in which a detection coil is formed, and this rotor is provided with a groove for setting wiring from the detection coil, and a hole is bored at a position opposite to this groove, and a It is an object of the present invention to provide a rotary position detection device using electromagnetic induction that can be used even in machines rotating at high speed by setting a dynamic balance.

An embodiment of the present invention will be described below with reference to the drawings. Figure 2 shows its configuration. On the surface 12 of the rotor L, which faces the stator at a constant distance (not shown in this figure), radial zigzag connections are made using wiring such as copper foil. A coil glossy turn 14 is formed in a state where

Then, as described above, the rotary transformer 16 is buried and a wiring groove 17 is formed. and,
An electric wire 18 is passed through this wiring groove 1 to connect the pattern 14 and the transformer 16. In this case, wiring trench l
Fill it with an insulator 20 as appropriate to make it durable against centrifugal force. In this case, the wiring groove U is formed as described above, and the electric wire 18 is arranged and set, and the insulator 2 is placed in this part.
When 0 is embedded and set, the weight of this part changes and increases relative to other parts. Therefore, if left as is, the weight balance of the outer circumferential portion of the disk-shaped rotor blade will be lost, resulting in eccentricity.

Therefore, a balance hole 21 is bored in the periphery on the opposite side across the central axis from the wiring groove L where the weight increases. Then, the weight balance of the rotor 12 is set to be equalized around the central axis and around the outer periphery.

In other words, by providing the rotor 12 with two balances, stable high-speed rotation becomes possible. Therefore, this rotational position detection device can now be used on machines that rotate at high speeds, making it possible to achieve extremely precise indexing angles or stopping accuracy. become.

Figure 3 shows an example where the detection device is installed on a machine that rotates at high speed, and the detection device shown in the above embodiment is used for positioning when drilling three tapped holes perpendicular to the axis of a workpiece 30. Then, move the stator If onto the headstock 32 so that the rotor 12 can be attached to the main shaft 33. In addition, in the figure, 34 is a chuck, 35 is a tail stock, and 36 is a tap tool.

As described above, according to the present invention, a stator has a stator formed with concentric current coil gloss turns, and a rotor has a detection coil formed opposite the stator at a small interval so as to face the coil pattern. This rotor is provided with a groove for setting the wiring from the above-mentioned detection coil, and furthermore, a hole is bored at a position opposite to the groove of the groove, and the dynamic balance is set by the hole. In addition, it is possible to provide a rotary position detection device using electromagnetic induction that can be used even in machines that rotate at high speed.

[Brief explanation of drawings]

Figure 1 shows a conventional rotary position detection device.
(a) is a partially cutaway plan view, (b) is (,)
The cross-sectional view taken along the line b-b in the figure, and FIG. ~Figure b
-b1s sectional view, FIG. 3 is a diagram showing an example of a machine to which a rotary position detection device using electromagnetic induction according to the present invention is attached. 11... Stator, 12... Rotor, 13.14.
...Coil pattern, 15.16...Rotary transformer, 1)...Wiring groove, 18...Electric wire, 20...
Insulator, 21... Balance hole, 30... Workpiece, 3
1... Tapped hole, 32... Headstock, 33... Main shaft, 34... Chuck, 35... Tail stock, 3
6...Tag tool. Figure 1-b Figure 3

Claims (1)

[Claims] A stator with a concentric current coil pattern,
The stator is provided with a rotor that forms a detection coil that is set to face the stator at a small interval and faces the coil pattern, and the rotor is provided with grooves for setting wiring from the detection coil. A rotary position detection device using electromagnetic induction, further comprising a hole bored at a position opposing the groove, and a dynamic balance set by the hole.