CN2793689Y

CN2793689Y - Differential-transformer displacement sensor

Info

Publication number: CN2793689Y
Application number: CN 200420105870
Authority: CN
Inventors: 薛荣生; 刘伟
Original assignee: Southwest University
Current assignee: Southwest University
Priority date: 2004-12-31
Filing date: 2004-12-31
Publication date: 2006-07-05
Anticipated expiration: 2014-12-31

Abstract

The utility model relates to a differential-transformer displacement sensor, which comprises a sleeve barrel end cover, a right end cover and a bobbin, wherein a first secondary coil, a primary coil and a second secondary coil are orderly arranged on the bobbin; a magnetic core is arranged in the bobbin. The utility model is characterized in that a wheel rim of a coil partition board on the bobbin and the inner wall of a sleeve barrel are in transition fit; a first binding post, a second binding post, a third binding post, a fourth binding post and a fifth binding post are arranged on a base seat of the bobbin; the third binding post and the fourth binding post are connected with a derivation end of the primary coil; the first binding post, the second binding post and the fifth binding post are connected with derivation ends of the first secondary coil and the second secondary coil. A return spring is arranged between the right end of the magnetic core and the base seat of the bobbin; the left end of the magnetic core is connected with a thimble which penetrates from the left end cover of the sleeve barrel. The utility model has the advantages of compact structure, small volume, strong anti-interference capability and high measurement precision, and is especially suitable for driving and sensing devices of vehicles.

Description

A kind of differential transformer displace

Technical field

The utility model relates to sensor, is specifically related to a kind of differential transformer displace.

Background technology

Existing differential transformer displace is to turn to the iron core of displacement and the primary coil of encirclement iron core by an edge, is enclosed within the secondary coil composition that two outer reversed polarity of primary coil connect; Primary coil connects power supply, utilizes the iron core displacement to change the magnetic resistance of magnetic circuit that is coupled between primary coil and two secondary coils, subtracts thereby make the induced voltage one of two secondary coils increase one, and its voltage difference has promptly reflected the iron core displacement.But structure is complicated, volume is big, poor anti jamming capability, the linearity are relatively poor, and is loosening easily between the parts, produces measuring error, is not suitable for measuring accuracy and requires high and the limited drive sensing device of installing space.

Summary of the invention

The purpose of this utility model provides a kind of differential transformer displace, and its volume is little, antijamming capability is strong, measuring accuracy is high, is specially adapted to the drive sensing device of vehicle.

Described a kind of differential transformer displace, comprise sleeve, be connected to the sleeve two ends left end cap and right end cap, be located at the bobbin in the sleeve, on bobbin, be provided with first secondary coil, primary coil and second subprime coil successively, in bobbin, be provided with magnetic core, the wheel rim of the coil division board on its bobbin and sleeve lining are transition fit, can not become flexible and influence measuring accuracy; The base of bobbin is provided with first binding post, second binding post, the 3rd binding post, the 4th binding post, the 5th binding post and fixed pin; The 3rd binding post is connected with the exit of primary coil with the 4th binding post; First binding post, second binding post and the 5th binding post are connected with the exit of first secondary coil with the second subprime coil, the output lead that is connected with each binding post is drawn with controller from the right end cap of sleeve and is connected, and the pilot hole on the right end cap of fixed pin and sleeve cooperates; Be provided with retracing spring between the right-hand member of magnetic core and the base of bobbin, the left end of magnetic core is connected with thimble, and thimble passes from the left end cap of sleeve, contacts with displacement component.

The utility model is compared with prior art, has its compact conformation, volume is little, antijamming capability is strong, parts are fixing reliable, and the advantage that measuring accuracy is high is specially adapted to the drive sensing device of vehicle.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A cut-open view of Fig. 1.

Fig. 3 is the synoptic diagram that magnetic core of the present utility model moves right.

Fig. 4 is the wiring schematic diagram of primary coil of the present utility model and secondary coil.

Embodiment

Referring to Fig. 1 and Fig. 2, with first secondary coil 5, primary coil 6 and second subprime coil 7 successively on bobbin 4, and the 3rd binding post 11 on the base 4a of the exit that makes primary coil 6 and bobbin is connected with the 4th binding post 12, and the exit of first secondary coil 5 and second subprime coil 7 is connected with the 5th binding post 13 with first binding post 9, second binding post 10 on the base 4b of bobbin; Right-hand member is connected with magnetic core 8 that retracing spring 16, left end be connected with thimble 17 packs in the bobbin 4, then, in the sleeve 1 of packing into together, and to make the wheel rim of the coil division board 4a on the bobbin and sleeve lining be transition fit; Thimble 17 passes from the left end cap 2 that is connected sleeve 1 left end; Right end cap 3 is connected the right-hand member of sleeve 1, and the fixed pin 14 on the base 4b that is located at bobbin is cooperated with pilot hole on the right end cap 3, the output lead 15 that connects five binding posts is drawn from right end cap 3, promptly constitutes the utility model.

Referring to Fig. 3 and Fig. 4, during use, thimble 17 of the present utility model is contacted with displacement component, output lead 15 is connected with power supply with controller and gets final product.When displacement component moves right, the thimble 17 that is in contact with it also moves right, the magnetic core 8 that is connected with thimble 17 also moves right thereupon, and compression retracteding position spring 16, the displacement of magnetic core 8 has changed the magnetic resistance of coupling magnetic circuit between primary coil and two secondary coils, thereby the induced voltage one that makes two secondary coils increases one and subtracts, and its voltage difference is the magnetic core displacement signal, and controller receives that displacement signal can make corresponding processing.When displacement component was moved to the left, thimble 17 and magnetic core 8 were moved to the left under the effect of retracing spring 16.

Claims

1, a kind of differential transformer displace, comprise sleeve (1), be connected to the sleeve two ends left end cap (2) and right end cap (3), be located at the bobbin (4) in the sleeve, on bobbin, be provided with first secondary coil (5), primary coil (6) and second subprime coil (7) successively, in bobbin, be provided with magnetic core (8), it is characterized in that the wheel rim of the coil division board (4a) on the bobbin and sleeve (1) inwall are transition fit; The base of bobbin (4b) is provided with first binding post (9), second binding post (10), the 3rd binding post (11), the 4th binding post (12) and the 5th binding post (13); The 3rd binding post (11) is connected with the exit of primary coil with the 4th binding post (12); First binding post (9), second binding post (10) and the 5th binding post (13) are connected with the exit of first secondary coil with the second subprime coil, and the output lead (15) that is connected with each binding post is drawn with controller from the right end cap of sleeve and is connected; Be provided with retracing spring (16) between the right-hand member of magnetic core (8) and the base of bobbin, the left end of magnetic core is connected with thimble (17), and thimble passes from the left end cap of sleeve, contacts with displacement component.

2, a kind of differential transformer displace according to claim 1 is characterized in that, also is provided with fixed pin (14) on the base of bobbin (4a), and the pilot hole on the right end cap of fixed pin (14) and sleeve cooperates.