JP5830735B2 - Rotating transformer type resolver - Google Patents

Description

  The present invention relates to a rotary transformer type resolver, and more particularly to a novel improvement for improving the magnetic coupling efficiency of a rotary transformer by widening a gap area where a ring-shaped rotor transformer core and a ring-shaped stator transformer core face each other.

Conventionally, as this type of rotary transformer type resolver which has been used, for example, a structure disclosed in Patent Document 1 as FIG.
That is, what is indicated by reference numeral 1 in FIG. 3 is a case whose overall shape is a cylindrical shape, and on the inner wall 1a of this case 1, a stator transformer 5A of a rotary transformer 2 formed in a ring shape is formed. An annular stator transformer core 3 is provided, and a resolver stator 4 is provided in a state separated from the annular stator transformer core 3 along the axial direction A.

The ring-shaped stator transformer core 3 includes first and second ring-shaped stator transformer core members 5 and 6 formed in two bodies, and a ring-shaped bobbin 7 is provided inside the ring-shaped stator transformer core 3. A stator transformer winding 8 is provided.
The resolver stator 4 is provided with a resolver stator winding 9.

A rotary shaft 12 is rotatably provided between first and second bearings 10 and 11 provided on both sides along the axial direction A of the case 1, and a rotor transformer winding is provided on the rotary shaft 12. A rotor transformer 13 composed of a ring-shaped rotor transformer core 13b having 13a and a resolver rotor 14 having resolver rotor windings 14a are provided in a state of being separated from each other.
The ring-shaped stator transformer core 3 and the rotor transformer 13 described above correspond to each other in a concentric arrangement and constitute the rotary transformer 2, and the resolver stator 4 and the resolver rotor 14 constitute a resolver portion 15. .

  In the above-described configuration, for example, in the case of the well-known two-phase excitation (stator excitation) single-phase output method, the rotating shaft 12 rotates with an excitation signal supplied to an excitation winding (not shown) of the resolver stator winding 9. Then, the rotation detection signal induced in the resolver rotor winding 14a is transmitted from the resolver rotor winding 14a to the rotor transformer winding 13a via a signal line (not shown). For example, the rotor transformer 13 is well-known by electromagnetic coupling. To the outside through the lead wire 20 through the rotor transformer winding 13a and the stator transformer winding 8.

JP 2003-75197 A JP-A-8-189805

Since the conventional rotary transformer type resolver is configured as described above, the following problems exist.
That is, in order to increase the magnetic efficiency of the rotary transformer, the gap distance between the inner peripheral surface of the annular stator transformer core and the outer peripheral surface of the annular rotor transformer core has been solved as much as possible. In order to reduce the size, it is necessary to improve the concentricity by increasing the processing accuracy of each transformer core. However, to improve the high processing accuracy, the cost is greatly increased, and the rigidity of the entire resolver is increased. In order to avoid gap fluctuation due to external force, it was difficult to avoid an increase in the cost of each component such as a bearing.

A rotary transformer type resolver according to the present invention includes a rotary shaft that is rotatably provided by a pair of bearings provided in a case, a resolver rotor and a rotor transformer that are separately provided on the rotary shaft, and an inner wall of the case In the rotary transformer type resolver in which the rotor transformer and the stator transformer form a rotary transformer, the stator transformer is provided in the case and faces each other. 1, a ring-shaped stator transformer core composed of a second ring-shaped stator member, and a stator transformer winding provided via a ring-shaped bobbin having a U-shaped cross section inside the ring-shaped stator transformer core, An annular rotortra provided on the rotary shaft and having a U-shaped cross section And scores, said annular rotor consists of a rotor transformer winding which is provided on the inner side of the transformer core, the first that protrudes inwardly along the axial direction on the inner diameter side of the annular stator core member, the second annular projection are opposed to each other, wherein each annular projection is positioned between the outer peripheral surface and the bobbin inner peripheral surface of the annular bobbin of said annular rotor transformer core, on both sides of the bobbin in the circumferential surface of the front Symbol annular bobbin, the outer The bobbin taper surface which goes down is formed, and the projection taper surface formed on the inner surface of each ring-shaped projection is in contact with the bobbin taper surface.

Since the rotary transformer type resolver according to the present invention is configured as described above, the following effects can be obtained.
That is, a rotating shaft provided rotatably by a pair of bearings provided on the case, a resolver rotor and a rotor transformer provided on the rotating shaft so as to be separated from each other, and an inner wall of the case provided on a separated basis. A rotary transformer type resolver, wherein the rotor transformer and the stator transformer form a rotary transformer, wherein the stator transformer is provided in the case and is opposed to each other. And a stator transformer winding provided via a ring-shaped bobbin having a U-shaped cross section inside the ring-shaped stator transformer core. The rotor transformer is provided on the rotating shaft and has a cross-section. A ring-shaped rotor transformer core having a U-shape and the ring-shaped rotor Consists of a rotor transformer winding which is provided on the inside of Nsukoa, the first that protrudes inwardly along the axial direction on the inner diameter side of the annular stator core member, the second annular protrusion is disposed opposite to each other, each The ring-shaped protrusion is located between the outer peripheral surface of the ring-shaped rotor transformer core and the inner peripheral surface of the bobbin of the ring-shaped bobbin. can widen the gap area transformer core are opposed to each other without increasing more than necessary the machining accuracy of each part, it is possible to improve the magnetic efficiency, on both sides of the bobbin in the circumferential surface of the front Symbol annular bobbin is Bobintepa surface descending toward the outside formed by the protrusion tapered surface formed on an inner surface of each annular projection that is in contact with the Bobintepa surface, stabilizing the annular projection has a thin It can be held in a ring-shaped bobbin Te.

It is sectional drawing which shows the rotary transformer type resolver by this invention. It is an expanded sectional view of the principal part of FIG. It is sectional drawing which shows the conventional rotary transformer type | mold resolver.

  An object of the present invention is to provide a rotary transformer type resolver in which the magnetic coupling efficiency of the rotary transformer is improved by widening the gap area where the ring-shaped rotor transformer core and the ring-shaped stator transformer core face each other.

Hereinafter, preferred embodiments of a rotary transformer type resolver according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, what is indicated by reference numeral 1 is a case having a cylindrical shape as a whole, and an inner wall 1a of the case 1 has a ring shape for forming a stator transformer 5A of the rotary transformer 2 formed in a ring shape. A stator transformer core 3 is provided, and a resolver stator 4 is provided in a state of being separated from the annular stator transformer core 3 along the axial direction A.

The ring-shaped stator transformer core 3 includes first and second ring-shaped stator transformer core members 5 and 6 formed in two bodies, and a ring-shaped bobbin 7 is provided inside the ring-shaped stator transformer core 3. A stator transformer winding 8 is provided.
The resolver stator 4 is provided with a resolver stator winding 9.

A rotary shaft 12 is rotatably provided between first and second bearings 10 and 11 provided on both sides along the axial direction A of the case 1, and a rotor transformer winding is provided on the rotary shaft 12. A rotor transformer 13 composed of a ring-shaped rotor transformer core 13b having 13a and a resolver rotor 14 having resolver rotor windings 14a are provided in a state of being separated from each other.
The ring-shaped stator transformer core 3 and the rotor transformer 13 described above correspond to each other in a concentric arrangement and constitute the rotary transformer 2, and the resolver stator 4 and the resolver rotor 14 constitute a resolver portion 15. .

  Accordingly, the stator transformer 5A includes a ring-shaped stator transformer core 3 formed of the first and second ring-shaped stator core members 5 and 6 that are provided in the case 1 and face each other, and a U-shaped cross section inside the ring-shaped stator transformer core 3. The rotor transformer 13 includes a ring-shaped rotor transformer core 13b having a U-shaped cross section provided on the rotary shaft 12, and the ring-shaped rotor. The rotor transformer winding 13a is provided inside the transformer core 13b.

  As shown in FIG. 2, the first and second annular protrusions 30 and 31 projecting inward along the axial direction A on the inner diameter side B of the annular stator core members 5 and 6 are arranged to face each other. Each of the annular protrusions 30 and 31 is located between the outer peripheral surface 32 of the annular rotor transformer core 13 b and the bobbin inner peripheral surface 7 a of the annular bobbin 7.

Inner end faces 30a, 31a at the tips of the ring-shaped protrusions 30, 31 protrude inward along the axial direction A from inner ends 33 of the outer peripheral faces 32 of the ring-shaped rotor transformer core 13b.
Further, the inner peripheral surfaces 34 of the annular projections 30 and 31 are in contact with both sides of the inner peripheral surface 7 a of the bobbin 7 of the annular bobbin 7.
Further, on both sides of the bobbin inner peripheral surface 7a of the ring-shaped bobbin 7, a bobbin taper surface 35 formed so as to descend outward is formed, and a protrusion taper surface formed on the inner surface of each of the ring-shaped protrusions 30 and 31. 36 is in contact with the bobbin taper surface 35.

Therefore, as in the configuration 2 described above, when the configuration form of the annular projections 30, 31 are in contact with the Bobintepa surface 35 of the bobbin inner peripheral surface 7a of the ring-shaped bobbin 7 has a projection tapered surface 36, in each since the end faces 30a, 31a protrude inwardly than the inner end 33 of the annular rotor transformer core 13b, when compared with the conventional arrangement of FIG. 3, it is possible to widen the gap area between the transformer core 3,13B, The magnetic efficiency in the rotary transformer can be greatly improved as compared with the prior art.

  The rotary transformer type resolver according to the present invention can be applied to a field having high rotation detection accuracy by improving the magnetic efficiency of the rotary transformer.

DESCRIPTION OF SYMBOLS 1 Case 1a Inner wall 2 Rotation transformer 3 Ring-shaped stator transformer core 4 Resolver stator 5 1st ring-shaped stator core member 5A Stator transformer 6 2nd ring-shaped stator core member A Axial direction B Inner diameter side 7 Ring-shaped bobbin 7a Bobbin inner peripheral surface 8 Stator transformer winding 9 Resolver stator winding 10 First bearing 11 Second bearing 12 Rotating shaft 13 Rotor transformer 13a Rotor transformer winding 13b Ring-shaped rotor transformer core 14 Resolver rotor 14a Resolver rotor winding 15 Resolver portion 30 First ring-shaped protrusion 30a Inner end face 31 2nd Ring-shaped projection 31a Inner end surface 32 Outer peripheral surface 33 Inner end 34 Inner projection inner surface 35 Bobbin taper surface 36 Projection taper surface

Claims (1)

A rotating shaft (12) rotatably provided by a pair of bearings (10, 11) provided in the case (1), a resolver rotor (14) provided to be separated from the rotating shaft (12), and A rotor transformer (13), and a resolver stator (4) and a stator transformer (5A) provided on the inner wall (1a) of the case (1) so as to be spaced apart from each other, the rotor transformer (13) and the stator transformer In the rotary transformer type resolver that forms the rotary transformer (2) by (5A),
The stator transformer (5A) includes a ring-shaped stator transformer core (3) including first and second ring-shaped stator core members (5, 6) provided on the case (1) and facing each other, and the ring-shaped stator transformer core (3 ) And a stator transformer winding (8) provided via a ring-shaped bobbin (7) having a U-shaped cross section, and the rotor transformer (13) is provided on the rotary shaft (12) and has a cross section. A ring-shaped rotor transformer core (13b) having a U-shape, and a rotor transformer winding (13a) provided inside the ring-shaped rotor transformer core (13b),
The first that protrudes inwardly along the axial direction (A) on the inner diameter side (B) of the annular stator core member (5,6), a second annular protrusion (30, 31) are opposed to each other, wherein Each annular projection (30, 31) is located between the outer peripheral surface (32) of the annular rotor transformer core (13b) and the bobbin inner peripheral surface (7a) of the annular bobbin (7), and the annular bobbin ( 7) Bobbin taper surfaces (35) are formed on both sides of the inner peripheral surface (7a) of the bobbin, and projecting taper surfaces (36) formed on the inner surfaces of the respective ring-shaped projections (30, 31). rotary transformer-type resolver you characterized in that in contact with the Bobintepa surface (35).

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