CN110986754B - Differential transformer type angular displacement sensor - Google Patents
Differential transformer type angular displacement sensor Download PDFInfo
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- CN110986754B CN110986754B CN201911282417.0A CN201911282417A CN110986754B CN 110986754 B CN110986754 B CN 110986754B CN 201911282417 A CN201911282417 A CN 201911282417A CN 110986754 B CN110986754 B CN 110986754B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
Abstract
The invention provides a differential transformer type angular displacement sensor. Wherein: the end cover (1) is arranged at the tail end of the shell (8); the rotor (16) is arranged in the center of the shell (8) through a rotating shaft (19), the front end of the rotating shaft (19) is supported by the first bearing (9) and the first retainer ring group (10), and the rear end of the rotating shaft (19) is supported by the second bearing (17) and the second retainer ring group (18) after being pressed by the pressing ring (20); the first retainer ring group (10) is the same as the second retainer ring group (18); the first coil (3) and the second coil (6) are respectively arranged on the first coil framework (4) and the second coil framework (5); the output coil (15) is shaped by a positioning pin (14) and then is installed on the output iron core (12); the magnetic conductive ring (13) is arranged on the inner ring of the output iron core (12); the sensor lead is led out from a lead plug (21). The invention is especially suitable for the occasions with large measurement angle, high sensitivity, high precision requirement and serious electromagnetic interference.
Description
Technical Field
The invention belongs to the field of differential transformer type angular displacement sensors, and relates to a structure and a winding of a differential transformer type angular displacement sensor.
Background
A differential transformer type angular displacement sensor (RVDT) is widely applied to the field of aerospace. The method can be used for measuring the attack angle of a flight control system; the displacement of the main control valve core can be detected and fed back in a hydraulic steering engine system; front wheel steering systems also often employ large angle (over 45 degree) RVDTs as command and feedback sensors to send steering angle command signals and feedback nose gear strut steering angle signals.
The detection angle of the RVDT sensor in the prior art is small, for example, the effective monitoring angle range of the small differential transformer type angle sensor disclosed in CN205981091U is not more than 45 degrees; CN205860983U discloses a differential transformer type angle sensor which can measure a maximum angle of approximately 80 degrees, but it uses one side of the exciting coil as the primary, and the closed path of the magnetic circuit is not good, so the accuracy of the sensor is not high.
Disclosure of Invention
(1) Objects of the invention
Provided is a differential transformer type angular displacement sensor with adjustable sensitivity, wherein the linear range is not less than 80 degrees.
(2) Technical scheme
A differential transformer angular displacement sensor comprising: casing (8), magnetic shield (11), second closed iron core (7), second coil skeleton (5), output iron core (12), first coil skeleton (4), first closed iron core (2) and end cover (1), wherein:
the end cover (1) is arranged at the tail end of the shell (8);
the magnetic cover (11), the second closed iron core (7), the second coil framework (5), the output iron core (12), the first coil framework (4) and the first closed iron core (2) are sequentially arranged in the shell (8);
the rotor (16) is arranged in the center of the shell (8) through a rotating shaft (19), the front end of the rotating shaft (19) is supported by the first bearing (9) and the first retainer ring group (10), and the rear end of the rotating shaft (19) is supported by the second bearing (17) and the second retainer ring group (18) after being pressed by the pressing ring (20);
the first retainer ring group (10) is the same as the second retainer ring group (18);
the first coil (3) and the second coil (6) are respectively arranged on the first coil framework (4) and the second coil framework (5);
the output coil (15) is shaped by a positioning pin (14) and then is installed on the output iron core (12);
the magnetic conductive ring (13) is arranged on the inner ring of the output iron core (12);
the sensor lead is led out from a lead plug (21).
(3) Advantageous effects of the invention
The RVDT sensor of the present invention has an effective electrical stroke greater than 80 degrees, the linearity of the sensor is better than 0.5%, with an adjustable difference ratio and value sensitivity. Has great practical application value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an RVDT angular displacement sensor of the present invention.
Figure 2 is a schematic view of the stator armature of the RVDT angular displacement sensor of the present invention.
Figure 3 is a schematic diagram of the coils of the RVDT angular displacement sensor of the present invention.
Wherein: the magnetic shield comprises an end cover (1), a first closed iron core (2), a first coil (3), a first coil framework (4), a second coil framework (5), a second coil (6), a second closed iron core (7), a casing (8), a first bearing (9), a first retainer ring group (10), a magnetic shield (11), an output iron core (12), a magnetic conductive ring (13), a positioning pin (14), an output coil (15), a rotor (16), a second bearing (17), a second retainer ring group (18), a rotating shaft (19), a pressing ring (20) and a lead plug (21).
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features and illustrative embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific arrangement and method set forth below, but rather covers any improvements, substitutions and modifications in structure, method, and apparatus without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
It should be noted that, in the case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the respective embodiments may be mutually referred to and cited. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of an RVDT angular displacement sensor of the present invention.
The end cover 1 is arranged at the tail end of the shell 8; the magnetic cover 11, the second closed iron core 7, the second coil framework 5, the output iron core 12, the first coil framework 4 and the first closed iron core 2 are sequentially arranged in the shell (8); the rotor 16 is installed in the center of the casing 8 through a rotating shaft 19, the front end of the rotating shaft 19 is supported by the first bearing 9 and the first retainer ring group 10, and the rear end of the rotating shaft 19 is supported by the second bearing 17 and the second retainer ring group 18 after being pressed by a pressing ring 20; the first retainer ring group 10 is the same as the second retainer ring group 18; the first coil 3 and the second coil 6 are respectively arranged on the first coil framework 4 and the second coil framework 5; the output coil 15 is shaped by the positioning pin 14 and then is installed on the output iron core 12; the magnetic conductive ring 13 is arranged on the inner ring of the output iron core 12; the sensor leads are led out from the lead plugs 21.
A closed iron core 2, a second closed iron core 7, a magnetic cover 11, an output iron core 12, a magnetic conductive ring 13 and a rotor 16 are taken as a magnetic line closed path to form two closed magnetic circuits.
Figure 2 is a schematic view of the stator armature of the RVDT angular displacement sensor of the present invention.
The output coil 15 includes: and a secondary a winding 151 and a secondary B winding 152 mounted on the first stator tooth 121 and the second stator tooth 122, respectively.
Figure 3 is a schematic diagram of the coils of the RVDT angular displacement sensor of the present invention.
Secondary a-winding 151 includes: third coil 1511 and fourth coil 1512; the secondary B winding 152 includes: a fifth coil 1521 and a sixth coil 1522; coil 1511 has the same number of turns as coil 1521, coil 1512 has the same number of turns as coil 1522, and coil 1511 and coil 1521 have a larger number of turns than coil 1512 and coil 1522, and the direction of current flow is opposite.
It should be noted that the above-mentioned flow operations may be combined and applied in different degrees, and for simplicity, implementation manners of various combinations are not described again, and those skilled in the art may flexibly adjust the sequence of the above-mentioned operation steps according to actual needs, or flexibly combine the above-mentioned steps, and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (7)
1. A differential transformer angular displacement sensor, comprising: end cover (1), first closed iron core (2), first coil (3), first coil skeleton (4), second coil skeleton (5), second coil (6), second closed iron core (7), casing (8), first bearing (9), first retaining ring group (10), magnetic shield (11), output iron core (12), magnetic ring (13), locating pin (14), output coil (15), rotor (16), second bearing (17), second retaining ring group (18), pivot (19), clamping ring (20), lead plug (21), wherein:
the end cover (1) is arranged at the tail end of the shell (8);
the magnetic cover (11), the second closed iron core (7), the second coil framework (5), the output iron core (12), the first coil framework (4) and the first closed iron core (2) are sequentially arranged in the shell (8);
the rotor (16) is of a 3-section integral structure, wherein both ends are full circles, and the middle section is a semicircle;
the rotor (16) is arranged in the center of the shell (8) through a rotating shaft (19), the front end of the rotating shaft (19) is supported by the first bearing (9) and the first retainer ring group (10), and the rear end of the rotating shaft (19) is supported by the second bearing (17) and the second retainer ring group (18) after being pressed by the pressing ring (20);
the first retainer ring group (10) is the same as the second retainer ring group (18);
the first coil (3) and the second coil (6) are respectively arranged on the first coil framework (4) and the second coil framework (5);
the output coil (15) is shaped by a positioning pin (14) and then is installed on the output iron core (12);
the magnetic conductive ring (13) is arranged on the inner ring of the output iron core (12);
the sensor lead is led out from a lead plug (21);
the output coil (15) includes: a secondary A winding (151) and a secondary B winding (152), wherein:
the secondary A winding (151) includes: a third coil (1511) and a fourth coil (1512);
the secondary B winding (152) comprises: a fifth coil (1521) and a sixth coil (1522);
the third coil (1511) is arranged on the first stator tooth (121);
the fourth coil (1512) is mounted on the second stator tooth (122);
the fifth coil (1521) is mounted on the second stator tooth (122);
the sixth coil (1522) is mounted on the first stator tooth (121);
the number of turns of the third coil (1511) is the same as that of the fifth coil (1521), the number of turns of the fourth coil (1512) is the same as that of the sixth coil (1522), the number of turns of the third coil (1511) and the fifth coil (1521) is larger than that of the fourth coil (1512) and the sixth coil (1522), and the current direction is opposite to that.
2. The differential transformer-type angular displacement sensor of claim 1, wherein:
a first closed iron core (2), a second closed iron core (7), a magnetic cover (11), an output iron core (12), a magnetic conductive ring (13) and a rotor (16) are respectively adopted as closed paths of magnetic lines of force to form two closed magnetic circuits.
3. The differential transformer-type angular displacement sensor of claim 1, wherein:
the magnetic cover (11) is of a thin-wall cylinder structure.
4. The differential transformer-type angular displacement sensor of claim 1, wherein:
the first closed iron core (2), the second closed iron core (7) and the output iron core (12) are formed by bonding punching sheets.
5. The differential transformer-type angular displacement sensor of claim 1, wherein:
the magnetic conduction rings (13) are two semi-cylindrical rings; the first closed iron core (2), the second closed iron core (7), the magnetic cover (11), the output iron core (12), the magnetic conductive ring (13) and the rotor (16) are all made of iron-nickel soft magnetic alloy.
6. The differential transformer-type angular displacement sensor of claim 1, wherein:
the output iron core (12) adopts a plurality of positioning pins (14) to shape the output coil (15) so as to reduce the impedance difference of the coil.
7. The differential transformer-type angular displacement sensor of claim 1, wherein:
a front coil (3) and a rear coil (6) which are the same are used as primary exciting coils of the sensor and are respectively arranged on a first coil framework (4) and a second coil framework (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282417.0A CN110986754B (en) | 2019-12-13 | 2019-12-13 | Differential transformer type angular displacement sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282417.0A CN110986754B (en) | 2019-12-13 | 2019-12-13 | Differential transformer type angular displacement sensor |
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| CN110986754A CN110986754A (en) | 2020-04-10 |
| CN110986754B true CN110986754B (en) | 2022-01-14 |
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| CN201911282417.0A Active CN110986754B (en) | 2019-12-13 | 2019-12-13 | Differential transformer type angular displacement sensor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9009843D0 (en) * | 1989-05-03 | 1990-06-27 | Penny & Giles Inductive Techno | Improvements relating to rotary position transducers |
| US5621179A (en) * | 1992-12-12 | 1997-04-15 | Penny & Giles Blackwood Limited | Rotary transducer |
| CN102175128A (en) * | 2011-01-24 | 2011-09-07 | 西安旭彤电子科技有限公司 | Differential transformer type line displacement sensor and manufacture and use methods thereof |
| CN203300420U (en) * | 2013-05-06 | 2013-11-20 | 马鞍山豪远电子有限公司 | Differential transformer structure |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
| JP6435457B2 (en) * | 2014-07-15 | 2018-12-12 | 多摩川精機株式会社 | Rotor structure of 1X type rotary differential transformer and manufacturing method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026191C (en) * | 1989-04-09 | 1994-10-12 | 许建平 | Angular displacement sensor for testing directional batter |
| CN102721428B (en) * | 2012-07-04 | 2015-06-10 | 湖南众航科技有限公司 | Speed-displacement sensor |
| CN105444663B (en) * | 2014-09-28 | 2018-07-24 | 中国航空工业集团公司西安飞机设计研究所 | A kind of RVDT design methods based on black box |
-
2019
- 2019-12-13 CN CN201911282417.0A patent/CN110986754B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9009843D0 (en) * | 1989-05-03 | 1990-06-27 | Penny & Giles Inductive Techno | Improvements relating to rotary position transducers |
| US5621179A (en) * | 1992-12-12 | 1997-04-15 | Penny & Giles Blackwood Limited | Rotary transducer |
| CN102175128A (en) * | 2011-01-24 | 2011-09-07 | 西安旭彤电子科技有限公司 | Differential transformer type line displacement sensor and manufacture and use methods thereof |
| CN203300420U (en) * | 2013-05-06 | 2013-11-20 | 马鞍山豪远电子有限公司 | Differential transformer structure |
| JP6435457B2 (en) * | 2014-07-15 | 2018-12-12 | 多摩川精機株式会社 | Rotor structure of 1X type rotary differential transformer and manufacturing method thereof |
| CN104748661A (en) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | Differential transformer type displacement sensor |
| CN104748661B (en) * | 2015-04-17 | 2018-02-23 | 兰州理工大学 | Differential transformer displacement transducer |
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| CN110986754A (en) | 2020-04-10 |
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