JPH0726718U - Rotating transformer type resolver - Google Patents

Abstract

(57) [Summary] [Structure] A resolver portion 9 including a resolver stator 3 provided inside a hollow cylindrical frame 1 and a resolver rotor 5 facing the inside of the resolver stator 3 with a gap therebetween.
A rotary shaft 6 for fixing and supporting the resolver rotor 5, and a transformer stator 11 provided adjacent to the resolver stator 3.
And a rotary transformer unit 10 including a transformer rotor 15 fixed to the rotary shaft 6 adjacent to the resolver rotor 5 and facing the transformer stator 11 via a gap, a rotary transformer type resolver comprising: Transformer stator 11
Is a stator core 12 formed in a ring shape by stacking U-shaped thin core pieces 20 made of a magnetic material in the circumferential direction, and a stator mounted in a groove formed in the stator core 12. The transformer rotor 15 is composed of the winding wire 14, and the transformer rotor 15 is a rotor core 16 formed in a ring shape by laminating U-shaped thin magnetic core pieces 23 in the circumferential direction, and the rotor core 16
And the rotor winding 18 mounted in the groove 24 formed in the. [Effect] It is possible to provide a small and efficient rotary transformer type resolver.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a resolver having a rotary transformer, and more particularly to the structure of the rotary transformer.

[0002]

[Prior art]

 Conventionally, a rotary transformer type resolver is composed of a resolver section and a rotary transformer section. For example, as shown in FIG. 1, a hollow cylindrical frame 1 in which a two-phase resolver winding 2 is wound inside a hollow cylindrical frame 1. The resolver stator 3 is provided, and the resolver rotor 5 having the resolver winding 4 wound therein is arranged inside the resolver stator 3 so as to face each other with a gap therebetween. Both sides are supported by the frame 1 via brackets 7 and bearings 8 and a resolver portion 9 is formed. Inside the frame 1, a stator iron core 12 of a transformer stator 11 constituting the rotary transformer unit 10 is provided axially adjacent to the resolver stator 3, and the stator iron core 12 is composed of a ring-shaped magnetic block. The U-shaped cross-section opens inward, the groove 13 formed in the center accommodates the stator winding 14 wound in the circumferential direction, and the stator winding 14 is connected to an external AC power source. I am doing it. The rotor core 16 of the transformer rotor 15 of the rotary transformer unit 10 facing the inner side of the stator core 12 with a gap is fixed to the rotary shaft 6, and the rotor core 16 is composed of a ring-shaped magnetic body block. The cross-section is formed in a U shape with an opening to the outside, and the rotor winding 18 wound in the circumferential direction is housed in the groove 17 at the center, and the rotor winding 18 is the resolver winding of the resolver rotor 5. It is connected to line 4. When an AC voltage is applied to the stator winding 14, a magnetic flux is generated in the stator core 12, and the magnetic flux flows through the air gap to the rotor core 16 to induce an AC voltage in the rotor winding 18, An alternating current flows through the resolver winding 4 connected to the rotor winding 18. The magnetic flux generated by the alternating current flowing in the resolver winding 4 induces a voltage proportional to the cosine and sine of the rotation angle of the resolver rotor 5 in the two-phase resolver winding 2 of the resolver stator 3, and this voltage Is used as a signal. On the contrary, the resolver winding 2 of the resolver stator 3 is excited by a voltage having a phase difference of 90 ° in electrical angle, and the stator winding of the stator core 12 is passed through the resolver rotor 5 and the rotor core 16. There is also a method of taking out a signal to 14. In any case, high-frequency magnetic flux reciprocates in the stator core and the rotor core of the rotary transformer.

[0003]

[Problems to be solved by the device]

 However, in the prior art, the stator core and the rotor core of the rotary transformer are cut out from a block of magnetic material to have a U-shaped cross section, or the cut out parts are bonded or shrink-fitted. I am making it. In this way, since the stator core and rotor core have an integral structure, the electrical resistance in the plane perpendicular to the direction of the magnetic flux is determined by the electrical resistivity of the core material used. Therefore, when the high frequency magnetic flux passes through the stator core and the rotor core, eddy current loss occurs. Further, since the magnetic flux has a high frequency, a skin effect occurs, and the magnetic flux concentrates and flows on the surface of the iron core, so that the core portion of the iron core does not work effectively. Further, since the stator core and the rotor core are molded from the magnetic material of the block, when the ring-shaped stator winding is stored in the groove of the stator core, one point is shown in Fig. 6 to facilitate storage. As shown by the chain line, the side portion 19 of the stator core 12 is formed as a separate piece, the stator winding 14 is housed in the groove 13, and then the side portion 19 is fixed to the stator core 12. Therefore, a seam is formed between the side surface and the main body of the stator core, which increases the magnetic resistance of the magnetic circuit of the stator core, which in turn causes an increase in the exciting current, resulting in an increase in copper loss. was there. An object of the present invention is to provide a rotary transformer type resolver with less eddy current loss and iron loss in the iron core.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a resolver portion including a resolver stator provided inside a hollow cylindrical frame and a resolver rotor that faces the inside of the resolver stator via a gap. A rotary shaft that fixes and supports the resolver rotor; a transformer stator that is provided adjacent to the resolver stator; a transformer shaft that is adjacent to the resolver rotor; and that is fixed to the rotary shaft; In a rotary transformer type resolver having a rotary transformer section composed of a transformer rotor facing each other with a gap, the transformer stator is formed by stacking U-shaped thin iron core pieces in the circumferential direction. And a stator core formed in a ring shape and a stator winding installed in a groove formed in the stator core. The transformer rotor is a U-shaped thin magnetic body. Empty A rotor core formed in a ring shape by laminating core pieces in the circumferential direction, in which is composed of a rotor winding mounted in said formed in the rotor iron core grooves. In addition, the stator core and the rotor core are formed by laminating core pieces that are formed in an involute curve shape in the radial direction.

[0005]

[Action]

 By the above means, the stator core and the rotor core are laminated with thin magnetic bodies in the direction of the magnetic path, so that the plane perpendicular to the magnetic flux lines is the magnetic body lamination direction, and the minute gaps between the layers The insulating layer on the surface of the piece greatly increases the electrical resistance and greatly reduces eddy currents. Also, the magnetic flux is unevenly distributed on the surface side of the iron core due to the skin effect, but since it has a laminated structure, the surface area is increased and the effective portion of the iron core is increased compared to the integrated type, so that the effective magnetic flux can be increased. In addition, since the stator core is formed by stacking U-shaped core pieces, the seams formed when the conventional side surface is composed of another piece do not occur, and the magnetic resistance in the magnetic flux line direction is reduced. It will not increase.

[0006]

【Example】

 The present invention will be described with reference to the embodiments shown in the drawings. The rotary transformer type resolver is composed of the resolver unit 10 and the rotary transformer unit 4, which is almost the same as the conventional configuration described with reference to FIG. What is different from the conventional one is the configuration of the rotary transformer unit 4. That is, FIG. 2 is a cross-sectional view showing the upper half of the rotary transformer portion 10 of the embodiment of the present invention. The stator core 12 of the transformer stator 11 is made by punching a thin silicon steel plate into a U shape by pressing. The core pieces 20 are formed by stacking them in the circumferential direction. As shown in FIG. 3 (a), the core piece 20 is fitted with a recess 21 formed when it is formed in a U shape from the outer peripheral side of the stator winding 14 formed in advance in a ring shape, and the cores are successively adjacent to each other. By fitting the piece 20 into the stator winding 14, the ring-shaped stator core 12 laminated on the outer peripheral side of the stator winding 14 is formed. After stacking the core pieces 20 in a ring shape, a cylindrical sleeve 22 is fitted around the stacked core pieces 20, and the stator core 12 is put into a mold to insert the core core 20 between the core core 20 and the stator winding 14 and the core. The pieces 20 are fixed to each other by molding with a resin. The rotor core 16 of the transformer rotor 15 is formed by stacking iron core pieces 23, which are similarly punched from a thin silicon steel plate into a U shape by press working, in the circumferential direction. As shown in FIG. 3B, the recess 24 of the iron core piece 23 is fitted from the inside of the rotor winding 18 formed in advance in a ring shape, and the iron core pieces 23 are successively and adjacently fitted to the rotor winding 18. By inserting, the ring-shaped rotor core 16 is formed on the inner peripheral side of the rotor winding 18. After the core pieces 23 are laminated in a ring shape, the sleeve 25 is fitted on the inner circumference of the core pieces 23, the rotor core 16 is put into a mold, and the space between the rotor winding 18 and the core pieces 23 and the core pieces 23 are inserted. Mold and fix each other with resin. In the stator core 12 and the rotor core 16 thus formed, thin silicon steel plates are laminated in the direction of the magnetic path, so that the plane perpendicular to the magnetic flux lines is the stacking direction of the silicon steel plates, and Because of the small gap and the insulating layer on the surface of the laminated core piece, the electrical resistance becomes very large and the eddy current is greatly reduced. FIG. 4 is a cross-sectional view showing the upper half of the rotary transformer portion 10 of another embodiment, in which core pieces are stacked without any gap. In the iron core piece shown in FIG. 1, a space is generated between the outer peripheral sides of the iron core piece 20 and the iron core piece 23 to reduce the space factor. 23 is deformed in an involute curve shape in the radial direction, and as shown in FIGS. 24 is fitted from the inner circumference of the rotor winding 18 and laminated in the circumferential direction. As described above, when the core pieces are deformed and laminated in an involute curve shape, no space is formed between the core pieces and the space factor is improved.

[0007]

[Effect of device]

 As described above, according to the present invention, since the eddy current generated in the rotary transformer is reduced, the eddy current loss is reduced and the surface area is increased due to the laminated structure, so that the effective magnetic flux can be increased. Therefore, the size can be reduced accordingly. In addition, since the iron core of the rotary transformer has a laminated structure of U-shaped core pieces, there is no seam, magnetic resistance is reduced and copper loss can be reduced, and it is a small and efficient rotary transformer type. It is effective in providing a resolver.

[Brief description of drawings]

FIG. 1 is a side sectional view of a rotary transformer type resolver of the present invention.

FIG. 2 is a cross-sectional view showing the upper half of the rotary transformer unit according to the embodiment of the present invention.

3A is an explanatory view showing a relationship between a stator winding and an iron core piece of FIG. 1, and FIG. 3B is an explanatory view showing a relationship between a rotor winding and an iron core piece.

FIG. 4 is a sectional view showing an upper half of a rotary transformer unit according to another embodiment of the present invention.

5A is an explanatory view showing the relationship between the stator winding and the core piece of FIG. 3, and FIG. 5B is an explanatory view showing the relationship between the rotor winding and the core piece.

FIG. 6 is an explanatory diagram showing a configuration of a conventional rotary transformer.

[Explanation of symbols]

1 frame, 2 resolver windings, 3 resolver stators, 4 resolver windings, 5 resolver rotors, 6 rotating shafts, 7 brackets, 8 bearings, 9 resolver parts, 10
Rotating transformer part, 11 transformer stator, 12 stator core, 13 groove, 14 stator winding, 15 transformer rotor, 16 rotor core, 17 groove, 18 rotor winding, 19 side part, 20 iron piece, 21 recess, 22
Sleeve, 23 Iron core piece, 24 Recess, 25 Sleeve

Claims (2)

[Scope of utility model registration request] 1. A resolver portion comprising a resolver stator provided inside a hollow cylindrical frame and a resolver rotor facing the inside of the resolver stator with a gap therebetween.
A rotating shaft that fixes and supports the resolver rotor, a transformer stator that is provided adjacent to the resolver stator, is fixed to the rotating shaft that is adjacent to the resolver rotor, and has a gap in the transformer stator. In a rotary transformer type resolver having a rotary transformer section composed of a transformer rotor and a transformer rotor opposed to each other, the transformer stator is formed by stacking iron core pieces made of a U-shaped thin magnetic body in a circumferential direction. Core piece made up of a U-shaped thin magnetic body, which is composed of a stator core formed in a U-shape and a stator winding mounted in a groove formed in the stator core. A rotary transformer having a rotor core formed in a ring shape by stacking in a circumferential direction, and a rotor winding installed in a groove formed in the rotor core. Resolver. 2. The rotary transformer resolver according to claim 1, wherein the stator core and the rotor core are formed by laminating core pieces formed in a radial involute curve shape.