JPH0528741Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a multiplex differential transformer, and in particular, a novel method for electrical zero position adjustment by adjusting the length of a probe provided in the core. Regarding improvements.

b. Prior Art Various configurations have been proposed for this type of multiplex differential transformer that has been used in the past, but here we will discuss a typical configuration. Although the name of the literature is not listed,
The configuration shown in FIGS. 2 to 4 and manufactured in-house by the present applicant can be mentioned.

That is, the conventional configuration shown in FIG. 2 is not a multiplex differential transformer but a linear differential transformer.
A probe 5 having a core 4 is provided in a hollow part 3 formed at the center of the axis of a fixed winding part 2 provided in the casing 1 so as to be slidable in the direction of arrow A. A position detection signal (voltage value) can be detected from the output line 6 of the fixed winding portion 2 according to the sliding position.

The conventional configuration shown in FIGS. 3 and 4 is a multiplex differential transformer in which two linear differential transformers 6 shown in FIG. 2 are connected in parallel and in series. In the case of the parallel connection configuration shown in FIG. As the member 8 moves, each core 4 moves simultaneously, thereby obtaining a position detection signal.

In addition, in the case of the series connection configuration shown in FIG. 4, two linear differential transformers 6 are directly connected in the axial direction, and each hollow part 3 is connected in series with each other to correspond to each fixed winding part 2. Each core 4 is held in position by a probe 5, and each core 4 on the probe 5 is fixedly provided to the probe 5.

c. Problems to be solved by the invention Since the conventional multiplex differential transformer was configured as described above, the following problems existed.

That is, since each core was fixed to the probe, the adjustment work to obtain the electrical zero position of the transformer was performed by moving the fixed winding section 2 in the axial direction. To move the fixed winding section 2 in the axial direction, after the above-mentioned zero position adjustment, the fixed winding section must be fixed again, and the work efficiency is extremely poor, making it difficult to improve productivity. It was extremely difficult.

The present invention was made to solve the above-mentioned problems, and in particular, it is a multi-difference device that can perform electrical zero position adjustment by adjusting the length of the probe provided in the core. The purpose of this invention is to provide a dynamic transformer.

d. Means for Solving the Problems The multiplex differential transformer according to the present invention includes at least one pair of ring-shaped fixed winding parts provided in series in a casing, and a hollow part provided in each of the fixed winding parts. a first core and a second core connected to each other, a first probe and a second probe connected to each core, a threaded portion formed in the second probe, and a threaded hole formed in the first core. The screw portion and the screw hole are screwed together.

e Effect In the multiplex differential transformer according to the present invention, a threaded portion is formed on the probe that holds the core, and the length of the probe itself can be adjusted. After assembling the multiplex differential transformer, the position of the core is moved in the axial direction by rotating the probe, and electrical zero position adjustment can be performed extremely easily without moving the fixed winding. It can be carried out.

f. Embodiments Hereinafter, preferred embodiments of the multiplex differential transformer according to the present invention will be described in detail with reference to the drawings.

Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.

FIG. 1 shows a multiple differential transformer according to the present invention.

In the series connection configuration shown in FIG. 1, the casings 1 are formed integrally and continuously, and in the continuously formed hollow part 3, there are casings 1 corresponding to each ring-shaped fixed winding part 2. 1. Second cores 4, 4A are arranged in series by first and second plungers 5, 5A.

A threaded portion 5a is formed at one end of the second plunger 5 provided in the second core 4A, and this threaded portion 5a can freely enter and exit a threaded hole 4a formed in the first core 4 having the first plunger 5. They are screwed together.

Therefore, the position of the second core 4A relative to the fixed winding portion 2 can be made variable.

The multiplex differential transformer according to the present invention is constructed as described above, and its operation will be described below.

In the series connection configuration shown in FIG. 1, a movable body (not shown), which is an object to be measured, is connected to the first plunger 5, and the first plunger 5 moves in conjunction with the operation of the movable body.
The moving position of the movable body can be detected by the change in the voltage value taken out from the fixed winding part 2 by the core 4.

Furthermore, when detecting such a moving position, it is necessary to detect the electrical zero position of each core 4, 4A with respect to the fixed winding part 2, but in this case, the plunger 5 must be rotated to tighten the screw. By moving the portion 5a in and out and adjusting the length of the plunger 5, the electrical zero position of the second core 4A can be adjusted through the position adjustment of the second core 4A.

In the present embodiment, a pair of two-unit configuration using two variable transformers has been described, but the present invention is not limited to the above-mentioned embodiment. It goes without saying that equivalent effects can be obtained.

g. Effects of the invention Since the multiplex differential transformer according to the invention is configured as described above, the following effects can be obtained.

In other words, the length of the plunger can be changed arbitrarily via the threaded part provided on the plunger, and the zero position can be electrically adjusted without any modification while the fixed part winding remains completely fixed. It is something that can be done.

Therefore, since there is no need to change the position of the fixed part winding, the structure is simpler than before, and work efficiency during assembly and adjustments during use after product shipment are greatly reduced. It is possible to obtain a multiplex differential transformer that is easy to use for both the production side and the user side.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a multiplex differential transformer according to the present invention, and FIGS. 2 to 4 are sectional views showing conventional differential transformers. 1 is a casing, 2 is a fixed winding part, 3 is a hollow part, 4 is a first core, 4A is a second core, 5 is a first probe, 5A is a second probe, 4a is a screw hole, 5
a is a threaded portion, and 8 is a holding member.

Claims (1)

[Scope of utility model registration request] At least a pair of annular fixed winding parts 2 provided in series in the casing 1; a first core 4 and a second core 4A provided in the hollow part 3 of each of the fixed winding parts 2; A first probe 5 and a second probe 5A connected to each core 4, 4A, a threaded portion 5a formed in the second probe 5A, and a threaded hole 4a formed in the first core 4, A multiplex differential transformer characterized in that the screw portion 5a and the screw hole 4a are screwed together.