JPH08136211A - Rotary-transformer type resolver - Google Patents

Abstract

PURPOSE: To decrease process manhours and to improve the accuracy at a low cost in a rotary-transformer type resolver by forming a rotor winding of a signal generating part and a detecting winding of a rotary transformer part of a continued conductor pattern on the same sheet coil. CONSTITUTION: A fixed-side sheet coil 2 is fixed to the gap surface of a fixed- side core 1 by bonding and the like. A primary winding 21 of a rotary transformer part and a detecting winding 22 of a signal generating part are formed by print winding and bonded to the upper and rear surfaces of an insulated substrate 23. A secondary winding 41 in a rotating-side sheet coil 4 is wound in the spiral shape so as to correspond to the winding 21 of the coil 2. One end part of the respective secondary winding patterns is connected by way of a through hole. An exciting winding 42 is connected by way of the through hole of the concentrated winding conductors of the upper and rear surfaces. When an AC voltage is applied on the winding 21 of the coil 2, the AC voltage is induced in the winding 41 of the coil 4. The induced voltage is generated in the winding 22. The inducted voltage is detected, and the rotating angle of the rotor is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer type resolver used for servo control of FA and OA equipment.

[0002]

2. Description of the Related Art A conventional rotary transformer resolver is provided with a hollow cylindrical primary side transformer core C1 inside a cylindrical frame as shown in FIG. 8, for example. 1 of the rotary transformer part A that connects to the power supply
A secondary winding A1 is provided. Further, a hollow cylindrical secondary resolver core D2 is provided adjacent to the primary transformer core C1 and a two-phase detection winding B2a, B2b of the signal generator B is provided in the secondary resolver core D2. I have it. Inside the primary-side transformer core C1 and inside the secondary-side resolver core D2, the primary side of the secondary-side transformer core C2 and the signal generating section B of the cylindrical rotary transformer section A are opposed to each other with a gap therebetween. The side resolver core D1 is arranged, and the secondary side transformer core C2 and the primary side resolver core D1 are fixed to a common shaft E. The secondary transformer core C2 is provided with the secondary winding A2 of the rotary transformer section A, the primary resolver core D1 is provided with the excitation winding B1 of the signal generating section B, and the secondary transformer winding of the rotary transformer section A is wound. The wire A2 and the excitation winding B1 are connected by a crossover F to excite the signal generator B.

[0003]

However, in the prior art, the secondary winding of the rotary transformer and the exciting winding of the signal generator are separate cores, namely the secondary transformer core and the primary winding.
Since it is provided on the secondary resolver core, after mounting the secondary transformer core and primary resolver core on the shaft, 2
The secondary winding and the excitation winding are connected by a crossover wire.
Therefore, there is a problem that the processing process becomes complicated, the number of steps for connecting the crossovers increases, and the cost of the resolver itself increases. Therefore, an object of the present invention is to provide a resolver of high accuracy at a low cost by reducing the processing man-hours by connecting the crossover wires in advance by printed wiring.

[0004]

In order to solve the above problems, according to the present invention, there is provided a rotating core facing a stationary core with a gap, a primary winding provided in the stationary core and the rotating core. In a resolver including a rotary transformer unit including a secondary winding provided on a side core, and a signal generating unit including an excitation winding provided on the rotating core and a detection winding provided on the fixed core, A fixed-side sheet coil fixed to the void surface of the fixed-side core and integrally forming a primary winding of the rotary transformer unit and a detection winding of the signal generating unit, and a void-side surface of the rotary-side core. The rotating-side sheet coil is fixed, and the secondary-side winding of the rotary transformer section and the exciting winding of the signal generating section are connected in series and integrally formed.

[0005]

By the above means, the secondary winding of the rotary transformer and the exciting winding of the signal generator are provided in one rotating sheet coil and are connected in series in advance by printed wiring or the like. A crossover wire between the secondary winding and the excitation winding is not required, and two sheet coils can be placed on both the fixed and rotating core surfaces, and both cores can be made to face each other with a predetermined gap. Since the resolver can be configured, it is possible to significantly reduce the manufacturing cost and provide a low-cost resolver.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side cross-sectional view showing a first embodiment of the present invention, which is an example of an axial gap type resolver having a sheet coil formed in a disc shape and having three pole pairs. In FIG. 1, 1 is a fixed core provided with a magnetic plate 10 made of a material having good high-frequency iron loss characteristics such as disk-shaped ferrite, and 2 is a fixing fixed to the void surface of the fixed core 1 by adhesion or the like. In the side sheet coil, the primary side winding 21 of the rotary transformer section A and the detection winding 22 of the signal generating section B are formed of a flat conductor by printed wiring by etching, printing or press working, and are formed into a disc shape. It is formed by adhering to the front and back surfaces of the insulating substrate 23 made of polyimide, and the surface of the conductor is insulated with polyimide resin or the like. Reference numeral 3 denotes a disk-shaped rotating core provided so as to face the fixed core 1 with a gap, and includes a magnetic plate 30 like the fixed core 1. The rotating core 3 has its center fixed to the shaft 31 and is supported by the brackets 11 and 11 ′ fixed to the fixed core 1 via the bearing 12. Reference numeral 4 denotes a rotating-side sheet coil fixed to the air gap surface of the rotating-side core 3 by adhesion or the like, and the secondary winding 41 of the rotary transformer A and the exciting winding 42 of the signal generator B are similarly printed wiring. It is formed by adhering it to the front and back surfaces of an insulating substrate 43 made of a disc-shaped polyimide, and the surface of the conductor is further insulated with a polyimide resin or the like. In addition, when fixing the fixed side core 1 and the fixed side sheet coil 2 and fixing the rotating side core 3 and the rotating side sheet coil 4 by adhesion, the thickness of the adhesive is about 25 μm. The increase in voids leads to an increase in power consumption. Therefore, when soft magnetic powder such as soft ferrite is mixed in the adhesive, the relative permeability of the adhesive is improved, the magnetic gap is reduced, and the power consumption can be reduced.

The fixed side sheet coil 1 is shown in FIG.
As shown in (b), the detection winding 22 of the signal generator B and the primary winding 21 of the rotary transformer A are provided. The detection winding 22 of the signal generator B has an insulating substrate 23 shown in FIG.
The A-phase winding 22a is arranged on the outer periphery on the front side of the above, and the B-phase winding 22b is arranged on the outer periphery on the back side shown in (b) so as to be electrically deviated from the A-phase winding 22a by 90 degrees. This example is 3
Since it has the number of pole pairs, the A-phase winding 22a and the B-phase winding 22
b are arranged in a circular shape so that the fan-shaped concentrated winding conductors 24 form three pole pairs on the outer peripheral portion of the insulating substrate 23. The concentrated winding conductor 24 includes a plurality of interlinking conductors 24a extending in the radial direction.
(A conductor that links the magnetic flux) and a plurality of arc-shaped coil end portions 24b that extend in the circumferential direction and that connect the link conductors 24a. On both surfaces of the insulating substrate 23 on the inner peripheral side of the A-phase winding 22a and the B-phase winding 22b, primary side windings 21 composed of spiral primary winding patterns 21a and 21b of the rotary transformer section A are provided, respectively. The A-phase winding pattern 22a and the primary winding pattern 21a form one winding pattern, and the B-phase winding pattern 22b and the primary winding pattern 21b form one winding pattern. The rotation side sheet coil 4 is
As shown in the front and back surfaces of FIGS. 4A and 4B, the excitation winding 42 of the signal generator B and the secondary winding 41 of the rotary transformer A are provided. Excitation winding 42 of signal generator B
Is a fan-shaped concentrated winding conductor 4 on the outer peripheral portions of both surfaces of the insulating substrate 43.
Exciting winding patterns 42a and 42b of three pole pairs of 4 are arranged and connected so as to form the exciting winding 42 of one circuit. The concentrated winding conductor 44 is composed of a plurality of interlinking conductors 44a extending in the radial direction and a plurality of arcuate coil end portions 44b extending in the circumferential direction connecting the interlinking conductors 44a.
Secondary windings 41 composed of spiral secondary winding patterns 41a and 41b of the rotary transformer section A are provided on both surfaces of the insulating substrate 43 on the inner peripheral side. The secondary winding pattern 41a and the exciting winding pattern 42a, and the secondary winding pattern 41b and the exciting winding pattern 42b are respectively formed by one winding pattern formed on the same surface of the insulating substrate 43, and the winding pattern is formed. Excitation winding patterns 42a and 4
A connection portion T3 that connects 1b in series is provided.

As shown in FIGS. 2 and 3, the circuit of the primary winding 21 of the rotary transformer A in the fixed-side sheet coil 1 has a primary winding from a terminal connected to an AC power supply AC or a pulse generator. It is connected to the outer peripheral conductor of the pattern 21a, is spirally wound inside, is passed from the inner conductor through the through hole T, is connected to the primary winding pattern 21b on the back side, and is spirally wound outside from the inner conductor. It is opened and connected to the terminal. A of the detection winding 22 of the signal generator B
The phase winding pattern 22a passes through the through hole T5 from the terminal provided on the back side, and the A phase winding pattern 2 provided on the front side.
It is connected to the through hole T5 in the central portion of 2a, passes through the concentrated winding conductor 24, and leads from the outer conductor to the outer conductor of the adjacent concentrated winding conductor 24 having a phase difference of 180 ° in electrical angle. Further, it is spirally wound inward, passes through the through hole T in the central portion of the concentrated winding conductor 24, and is connected to the back-side transition conductor 25.
It passes through the through hole T in the central portion of the adjacent concentrated winding conductor 24, is spirally wound outward, passes through the outer conductor, and leads to the adjacent concentrated winding conductor 24. This is repeated, and finally it passes through the through hole T6 on the back side and is connected to the terminal. Similarly, the B-phase winding pattern 22b of the detection winding 22 of the signal generator B is connected to the through hole T7 at the center of the concentrated winding conductor 24 from the terminal provided on the front side, and sequentially,
It passes through the adjacent concentrated winding conductor 24, and is connected to the terminal through the through hole T8.

Secondary winding 41 in the rotating sheet coil 4
As shown in FIGS. 2 and 4, the coil is spirally wound so as to correspond to the primary winding 21 of the fixed-side sheet coil, and one end of each of the secondary winding patterns 41a and 41b is a through hole. Connected by T. The exciting windings 42 are connected by a through hole T in the center of the concentrated winding conductor 24 on the front and back surfaces. The other end portion of the secondary winding pattern 41a on the front surface and the excitation winding pattern 42a are connection portions 45a provided on the same pattern, and the other end portion of the secondary winding pattern 41b on the back surface and the excitation winding pattern on the front surface. Four
2a is connected by a through hole T3, and each winding pattern is connected in series. When an AC voltage is applied to the primary winding 21 of the fixed-side sheet coil 2 of the rotary transformer section A, an AC voltage is induced in the secondary winding 41 of the rotating-side sheet coil 4 and connected to the secondary winding 41. Excited winding 4
2 is excited, and an induced voltage is generated in the detection winding 22 by the mutual inductance between the excitation winding 22 and the detection winding 22. Since the magnitude of the induced voltage in the detection winding 22 changes sinusoidally depending on the rotation angle of the rotor, the rotation angle of the rotor can be detected by detecting the induced voltage in the detection winding 22.

In the above embodiment, the primary winding and the secondary winding of the rotary transformer are provided inside the detection winding and the excitation winding which are arranged in a ring shape forming the signal generator. As described above, the primary winding and the secondary winding of the rotary transformer may be formed outside the detection winding and the excitation winding of the signal generator. Further, in the above embodiment, the detection winding 22 is formed by stacking three fan-shaped concentrated winding conductors 24 of three pole pairs, and the excitation winding 42 is formed by stacking two fan-shaped concentrated winding conductors 44 of three pole pairs. As described above, the interlinking conductors 24a and 44a extending in the radial direction of the concentrated winding conductors 24 and 44.
(Coil end part 2 that connects the conductors that link to the magnetic flux)
4b and 44b are formed in an arc shape along the circumferential direction. Therefore, there is a problem that the conductor length becomes long, the conductor resistance increases, and the copper loss increases. In order to solve this, as shown in FIG. 5 and FIG. 6, the coil end portions 24b and 44b of the portions close to the centers of the stationary side sheet coil 2 and the rotating side sheet coil 4 are linearly formed.
Thereby, the length of the coil end portions 24b and 44b is
It becomes shorter than in the case of a circular arc, the coil resistance becomes smaller, and the copper loss can be reduced.

Further, in the above embodiment, the fixed core 1 having a disk shape is used.
An axial gap type resolver in which a disk-shaped fixed-side sheet coil 2 is provided in the disk-shaped rotary coil, the fixed-side sheet coil 2 is opposed to the fixed-side sheet coil 2 with an axial gap, and a disk-shaped rotary-side core 3 is provided with a rotary-side sheet coil 4. The fixed-side core is formed in a hollow cylindrical shape, the fixed-side sheet coil formed in the hollow cylindrical shape is provided inside the fixed-side core, and the fixed-side sheet coil is opposed to the fixed-side sheet coil through a radial gap to form a cylindrical shape. A radial gap type resolver may be formed by providing a cylindrical rotating side sheet coil on the outside of the rotating side core. Further, FIG. 5 exaggerates the cross section of the primary winding 21, the secondary winding 41, the excitation winding 42 of the signal generating portion, the connection terminals of the detection winding 41, and the connection portion of the through hole of the rotary transformer section A. It is the side sectional view shown. That is, the recesses 12, 3 are formed in the portions corresponding to the connecting portions such as the through holes of the stationary core 1 and the rotating core 3.
2, the stationary side sheet coil 2 and the rotating side sheet coil 4 are pressed against the recesses 12 and 32 to be deformed. With this configuration, when the terminals and the through holes are connected by solder plating, the terminals do not jump out from the surfaces of the fixed side sheet coil and the rotating side sheet coil, and thus the gap length can be set small.

[0012]

As described above, according to the present invention, the rotor winding of the signal generator and the detection winding of the rotary transformer are:
Since it is integrally formed with a continuous conductor pattern on the same sheet coil, the connection of crossovers is not necessary, and it is only necessary to fix two sheet coils to the core surface and to face each other with a required gap. Therefore, it is possible to significantly reduce the number of steps as compared with the conventional example. In addition, copper loss is reduced, power consumption is reduced, and the signal generator is also formed by a sheet coil, so the magnetomotive force distribution can be easily made into an ideal shape, which is more accurate than before. It is effective in providing a resolver.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a connection diagram showing a connection state of each part of the embodiment of the present invention.

FIG. 3 is a plan view of (a) a front side and (b) a back side of a fixed-side sheet coil according to an embodiment of the present invention viewed from the same direction.

FIG. 4 is a plan view of (a) a front side and (b) a back side of the rotating-side sheet coil of the embodiment of the present invention viewed from the same direction.

FIG. 5 is a plan view of (a) a front side and (b) a back side of a fixed-side sheet coil of another embodiment of the present invention viewed from the same direction.

FIG. 6 is a plan view of (a) a front side and (b) a back side of a rotating side sheet coil according to another embodiment of the present invention viewed from the same direction.

FIG. 7 is a side sectional view showing another embodiment of the present invention.

FIG. 8 is a side sectional view showing a conventional example.

[Explanation of symbols]

1 fixed side core, 10, 30 magnetic material plate, 11, 11 '
Bracket, 12 bearings, 13 and 32 recesses, 2 fixed side sheet coil, 21 primary side winding, 21a and 21b
Primary winding pattern, 22 detection winding, 23 insulating substrate,
24 concentrated winding conductor, 24a interlinking conductor, 24b coil end portion, 25 crossover conductor, 3 rotation side core, 31 shaft, 4 rotation side sheet coil, 41 secondary side winding,
41a, 41b secondary winding pattern, 42 excitation winding,
43 insulating substrate, 44 concentrated winding conductor, 44a interlaced conductor, 44b coil end part, 45a connecting part, A rotating transformer part, B signal generating part, T, T3, T5, T
6, T7, T8 through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Maemura 2-1, Kurosaki Shiroishi, Hachimansai-ku, Kitakyushu, Fukuoka Yasukawa Electric Co., Ltd. (72) Takashi Nagase 2-1, Kurosaki Shiroishi, Hachimannishi-ku, Kitakyushu, Fukuoka No. Yasukawa Electric Co., Ltd.

Claims (7)

[Claims] 1. A rotary transformer section comprising a rotating core facing a stationary core with a gap, a primary winding provided on the stationary core, and a secondary winding provided on the rotating core. And a signal generating unit including an excitation winding provided on the rotating core and a detection winding provided on the stationary core, in a resolver fixed to the void surface of the stationary core, Fixed side sheet coil integrally formed with the primary side winding of the section and the detection winding of the signal generating section, and the secondary side winding of the rotating transformer section fixed to the void surface of the rotating side core. A rotary transformer type resolver comprising a rotating side sheet coil integrally formed by connecting in series with the exciting winding of the signal generating section. 2. The fixed-side sheet coil and the rotating-side sheet coil are formed in a disc shape, and are provided on a signal generating portion provided on an outer peripheral portion of each sheet coil and on an inner peripheral portion of each sheet coil. The rotary transformer type resolver according to claim 1, further comprising a rotary transformer section. 3. The fixed-side sheet coil and the rotating-side sheet coil are formed in a disc shape, and are provided on a signal generating portion provided on an inner peripheral portion of each sheet coil and on an outer peripheral portion of each sheet coil. The rotary transformer type resolver according to claim 1, further comprising a rotary transformer section. 4. The fixed side core and the hollow cylindrical fixed side sheet coil fixed to an inner peripheral portion or an outer peripheral portion of the fixed side core are formed into a cylindrical shape, and face the fixed side core with a gap. 2. The rotary transformer type resolver according to claim 1, further comprising a hollow cylindrical rotating-side sheet coil fixed to an air-gap surface of the rotating-side core facing the fixed-side core. 5. A recess is provided in a portion corresponding to each connecting portion of the fixed core and the rotary core, and the fixed sheet coil and the rotary sheet coil are pressed into the recess to be deformed. Any one from 1 to 4
The rotating transformer type resolver according to the item. 6. The coil end portion of a portion of the concentrated winding conductor forming the fixed side sheet coil and the rotating side sheet coil near a center of the sheet coil is linearly formed. The rotating transformer type resolver according to the item. 7. The fixed side core and the fixed side sheet coil, and the rotating side core and the rotating side sheet coil are fixed by an adhesive agent mixed with soft magnetic powder. The rotating transformer type resolver according to item 1.