JP3044268B2 - Rotation detector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotation detector, and more particularly, to a rotation detector comprising a stator core and a rotor core formed by radially stacking a plurality of cylinders having different diameters from each other. A new improvement to obtain a flat rotation detector by arranging the cores facing each other in the axial direction and obtaining a gap between the cores as an axial gap and arranging rotary transformers in the radial direction of the cores. .

b. Prior Art There are various types of rotation detectors that have been used in the past. Among them, a typical configuration is described in JP-A-63-318725 shown in FIG. Configuration.

That is, what is indicated by reference numeral 1 in the drawing is a casing, and a stator core 3 having a stator winding 2 is provided on an inner wall 1 a of the casing 1.

At the center position of the casing 1, a rotary shaft 4 having a hollow cylindrical shape is rotatably provided.
A rotor core 6 having a rotor winding 5 is fixed at a position corresponding to the stator core 3 on the outer wall 4a of the outer wall 4a, so that the cores 3, 6 and the windings 2, 5 constitute a rotation detecting unit 7. ing.

At an axial position adjacent to the stator core 3 on the inner wall 1 a of the casing 1, a stator winding 10 for a rotary transformer is provided, and at an axial position adjacent to the rotor core 6 on the outer wall 4 a of the rotary shaft 4. Is provided with a rotor winding 11 for a rotary transformer.

Accordingly, the rotary transformer 12 is constituted by the rotary transformer stator winding 10 and the rotary transformer rotor winding 11.

In the above configuration, for example, the stator winding 2
When the rotating shaft 4 is rotated in a state where is excited, a voltage is generated in the rotor winding 5 by electromagnetic flux due to electromagnetic induction, and a sine wave rotation detection signal corresponding to the rotation angle of the rotor winding 5 is generated. , Can be taken out through the rotor winding 11 and the stator winding 10 of the rotary transformer 12.

c. Problems to be Solved by the Invention Since the conventional rotation detector was configured as described above, the following problems existed.

That is, in the conventional configuration, the stator core and the rotor core that constitute the rotation detection unit are arranged in the radial direction of the rotating shaft because they are overlapped in the axial direction. Magnetic coupling based on
Since a sine wave is output, and the rotary transformer is also provided in the axial direction while being juxtaposed to the rotation detection unit,
The thickness in the axial direction has been increased, and it has been extremely difficult to meet the demand for a thin rotation detector.

The present invention has been made to solve the above problems, and in particular, a stator core and a rotor core, which are formed by stacking a cylindrical body in a radial direction, are disposed so as to face each other in the axial direction of the rotation shaft, and each core is An object of the present invention is to provide a flat thin rotation detector by providing a gap therebetween as an axial gap and arranging rotary transformers in parallel in a radial direction of each core.

d. Means for Solving the Problems The rotation detector according to the present invention has a plurality of cylinders having different diameters overlapped in the radial direction, and a plurality of grooves are formed at predetermined intervals along the circumferential direction on both side surfaces thereof. A stator core and a rotor core formed in a non-radial direction, a rotating shaft supporting the rotor core, a stator winding provided in the groove of the stator core, a rotor winding provided in the groove of the rotor core, A rotation transformer for transmitting and receiving signals to and from a rotation detection unit formed by each core and each winding, wherein the stator core and the rotor core are arranged facing each other in the axial direction of the rotating shaft while maintaining an axial gap. The stator winding and the rotor winding face directly in the axial direction, and the rotary transformer is arranged in the radial direction of each of the cores.

e. Function In the rotation detector according to the present invention, the stator core and the rotor core of the rotation detection unit are configured by radially overlapping a plurality of cylinders having different diameters in the radial direction, and are arranged to face each other in the axial direction. Magnetic coupling is performed via the gap to obtain a rotation detection signal. Further, since the rotation transformer is disposed inside or outside the rotation detection unit in the radial direction of the rotation detection unit, it is possible to prevent the thickness of the rotation shaft in the axial direction from being increased, and to reduce the thickness of the rotation detection unit. A shape rotation detector can be obtained.

Therefore, the thickness of the rotation detector can be determined only by the thickness of the rotation detector.

f. Embodiment Hereinafter, a preferred embodiment of the rotation detector according to the present invention will be described in detail with reference to the drawings.

The same parts as those in the conventional example will be described using the same reference numerals.

1 to 3 show a rotation detector according to the present invention. FIG. 1 is a cross-sectional view, FIG. 2 is a reduced side view showing a core of a rotation detector, and FIG. It is a front view of a figure.

In FIG. 1, a casing indicated by reference numeral 1 is a casing. A stator core 3 having a stator winding 2 is provided on an inner wall 1 a of the casing 1 via a ring-shaped stator frame 20.

As shown in FIGS. 2 and 3, the stator core 3 is formed by radially stacking a plurality of cylindrical bodies 21 having different diameters from each other. A plurality of grooves 22 are formed at predetermined intervals along the non-radial direction.

The stator winding 2 is formed in the groove 22 by a well-known toroidal winding. The stator core 3 is located at the outermost end of the stator frame 20.

A front lid 23 is provided at one end of the casing 1, and bearings 24, 2 provided on the casing 1 and the front lid 23 are provided.
5, a rotating shaft 4 having a rotor core 6 having a rotor winding 5 is rotatably provided.
The rotation detecting unit 7 is constituted by 2,5.

Since the rotor core 6 has exactly the same structure as the above-described stator core 3, its description is omitted, but a rotor frame hole formed in the center of a rotor frame 26 corresponding to the stator frame 20 is omitted. A rotor core 27 is provided inside 26a, and the rotary shaft 4 is fitted and penetrates into a shaft hole 27a of the rotor core 27.

The rotating shaft 4 penetrates through a stator frame hole 20a formed at the center of the stator frame 12 and
4 and projects through the other bearing 25 toward the front lid 4.

The rotor winding 5 has the same structure as that of the stator winding 2 of the stator core 3 described above.
Each winding 2,5 is directly facing each other.

Further, a stator winding 10 for the rotary transformer is provided inside the stator frame 20 inside the stator core 3.
The stator winding 10 for the rotary transformer is provided.
Are located radially inside the stator core 3, and the stator core 3 and the stator winding 10 are located in the same radial direction in the stator frame 20.

A rotor winding 11 for a rotary transformer is provided at a position inside the rotor core 6 in the rotor frame 26. The rotor winding 11 for the rotary transformer is located inside the rotor core 6 in the radial direction. The rotor core 6 and the rotor winding 11 for the rotary transformer are located in the same radial direction in the rotor frame 26.

Accordingly, the rotary transformer 12 is constituted by the rotary transformer stator winding 10 and the rotary transformer rotor winding 11.

An axial gap D is provided between each of the cores 3 and 6 in the rotation detecting section 7 and each of the windings 10 and 11 in the rotary transformer 12.
Are magnetically coupled to each other.

Therefore, in the above-described configuration, for example, when the rotary shaft 4 is rotated in a state where a signal is transmitted to the stator winding 2 via the rotary transformer 12 and excited, the rotor core 6 and the rotary transformer rotor winding 26 rotate. Due to the electromagnetic induction, a voltage is generated in the rotor winding 5 by the interlinkage magnetic flux, and a sine wave rotation detection signal corresponding to the rotation angle of the rotor winding 5 is generated.
This rotation detection signal is applied to the rotor winding of the rotary transformer 12.
It can be received and taken out via the 11 and the stator winding 10.

In the above-described embodiment, the case where the rotary transformer 12 is disposed inside the rotation detecting unit 7 and disposed so as to be on the same surface in the same radial direction has been described. It is needless to say that the same operation can be obtained even when it is arranged at a position outside the rotation detecting unit 7.

g. Effects of the Invention Since the rotation detector according to the present invention is configured as described above, the following effects can be obtained.

That is, since the stator core and the rotor core are formed by stacking a plurality of cylindrical bodies having different diameters in the radial direction, the stator core and the rotor core of the rotation detecting unit are:
Since the rotation transformers are arranged to face each other in the axial direction and the rotation transformer is arranged inside or outside in the radial direction of each core of the rotation detection unit, the axial thickness of the entire rotation detector can be reduced, Since a flat configuration can be obtained with the same performance as the conventional one, it is possible to sufficiently meet the demand for thinning.

[Brief description of the drawings]

1 to 3 show a rotation detector according to the present invention, wherein FIG. 1 is a sectional view, FIG. 2 is a reduced side view showing a core of a rotation detector, and FIG. Front view of FIG. 2, fourth
FIG. 1 is a sectional view showing a conventional rotation detector. 2 is a stator winding, 3 is a stator core, 4 is a rotating shaft, 5
Is a rotor winding, 6 is a rotor core, 10 is a cylindrical body, 12 is a rotary transformer, and D is an axial gap.

Claims (3)

(57) [Claims] 1. A plurality of cylindrical bodies (21) having different diameters are overlapped in a radial direction, and a plurality of grooves (22) are formed on both side surfaces thereof at predetermined intervals along a circumferential direction in a non-radial direction. A stator core (3) and a rotor core (6); a rotating shaft (4) supporting the rotor core (6); and a stator winding (2) provided in the groove (22) of the stator core (3).
Transmission and reception of signals to and from a rotor winding (5) provided in the groove (22) of the rotor core (6), and to a rotation detector (7) formed by the cores (3, 6) and the windings. The stator core (3) and the rotor core (6) are arranged to face each other in the axial direction of the rotating shaft (4) while maintaining an axial gap (D). The stator winding (2) and the rotor winding (5) are directly opposed in the axial direction, and the rotary transformer (12) is arranged in the radial direction of each of the cores (3, 6). Rotation detector. 2. The rotation detector according to claim 1, wherein the rotation transformer is located inside each of the cores. 3. The rotation detector according to claim 1, wherein said rotary transformer is located outside each of said cores.