JP3138606B2 - Angle detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle detector and, more particularly, to a novel improvement for eliminating an output voltage imbalance due to a misalignment of a stator.

[0002]

2. Description of the Related Art A variable reluctance resolver of this type, which has been conventionally used, generally has a structure shown in FIGS. 5 and FIG.
Is a cylindrical case, and a stator 2 is provided inside the case 1. The stator 1
In this case, the excitation winding 3 and the output winding 4 having the winding structure shown in FIG. 7 are wound, and the excitation winding 3 has a pair of input terminals R1 and R2. The output winding 4 has two phases as shown by a solid line and a dotted line.
It has output terminals S1, S3 and S2, S4. Inside the stator 1, a hollow rotary shaft 6 having an eccentric rotor 5 is rotatably provided.

Accordingly, in the above-described configuration, as shown in FIG. 8, the excitation coil 3 and the excitation coil 4 are used in reverse, and two-phase excitation is used to output one phase, and the excitation voltage of SIN is input from terminals S2 and S4. When the rotor 5 is rotated by inputting the excitation voltage of COS from the terminals S1 and S3, the output voltages shown in FIGS. 9 and 10 are obtained from the terminals R1 and R2. That is,
In the case of the COS excitation of FIG. 9, an output voltage component E by one excitation winding A and an output voltage component F by the other excitation winding B are output, and the output voltage components E and F are as shown in FIG. The combined output voltage G is output according to the rotation angle of the rotor 5. In general, in the case of a well-known winding type resolver, as shown in FIGS. 14 and 15, in the case of two-phase output of one-phase excitation, output vectors are as shown in FIG.

[0004]

The variable reluctance resolver according to the related art has the following problems because it is configured as described above. That is, as shown in FIG. 11, when a misalignment has occurred in the processing of the stator 1, the output voltage components E and F corresponding to FIG. 13), a level difference ΔD is generated as shown in FIG. 13. In this state, when the signals are combined as shown in FIG. 13, the normal output voltage shown in FIG.
As shown by the solid line, 0 ° (360 °), 90 °, 180 °
At the time of °, a level difference ΔD occurs, and an error occurs with respect to the original normal output voltage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide an angle detector which eliminates imbalance in output voltage due to misalignment of a stator. I do.

[0006]

In the angle detector according to the present invention, a pair of variable reluctance resolvers are arranged on the same axis, and the origin positions of the respective stators and rotors of the respective variable reluctance resolvers are shifted from each other by 180 °. And each of the excitation windings and each of the output windings of each of the variable reluctance resolvers are connected in series.

More specifically, each rotor of the variable reluctance resolver is provided such that the gap permeance between the rotor and the stator varies with the SIN function depending on the eccentricity or rotation angle with respect to the rotation axis. .

[0008]

In the angle detector according to the present invention, since the origin positions of the stators and the rotors of the pair of variable reluctance resolvers are arranged on the same axis while being shifted from each other by 180 °, the output voltage of each resolver is reduced. Since the output voltages are output according to the shaft angle with a constant level difference (solid line in FIG. 4), these output voltages are combined by a winding, and as shown by a dotted line in FIG. The phase-side output voltage imbalance is canceled, and a high-precision output voltage is output.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an angle detector according to the present invention will be described below in detail with reference to the drawings. Note that the same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, what is indicated by reference numeral 1 is a cylindrical case, and a first stator 2 and a second stator 2 </ b> A are provided inside the case 1. Each of the stators 2 and 2A is provided to constitute first and second resolvers 30 and 40 having a variable reluctance type configuration. Each of the stators 2 and 2A has a winding as shown in FIG. First and second excitation windings 3 and 3A for one-phase excitation having a wire structure are provided in each slot 10, and each of the excitation windings 3 and 3A has its winding end 3a and winding start 3b connected in series. At the same time, terminals R1 and R2 are connected to the winding start 3c of the first excitation winding 3 and the winding end 3d of the second excitation winding 3A.

Each of the stators 2 and 2A is attached to the case 1 with the respective origin positions 2X and 2Y, which are the basis of rotation, shifted from each other by 180 degrees with respect to each other, and formed inside the stators 2 and 2A. A hollow rotating shaft 6 having a pair of first and second rotors 5 and 5A is rotatably provided in the space. Each of these rotors 5, 5A
Are provided corresponding to each of the stators 2 and 2A so as to be eccentric to the rotating shaft 6 in order to constitute a variable reluctance type resolver. The same applies to the case where the gap permeance of the stators 2 and 2A is changed), and the origin position 5 which is the rotation reference of each of the stators 5 and 5A.
The phases are shifted from each other so that X and 5Y have a positional relationship different from each other by 180 °.

Further, each of the stators 2 and 2A is provided with first and second output windings 4 and 4A. These output windings 4 and 4A are shown by solid lines and dotted lines in FIG. A pair of first and second phases (90 °) out of phase with each other
It has coils 4a, 4b and 4Aa, 4Ab, and each first coil 4a, 4Aa and each second coil 4b, 4Ab in each output winding 4, 4A are connected in series. Terminals S1 and S3 are connected to the winding start 4d and winding end 4e of each of the first coils 4a and 4Aa, and the winding start 4f and winding end 4g of each of the second coils 4b and 4Ab are connected to the terminal S2.
S4 is connected.

Accordingly, when the rotors 5 and 5A are simultaneously rotated via the rotary shaft 6 in the above-described configuration, the output voltage levels from the resolvers 30 and 40 are in-phase from the original as shown by the solid line in FIG. The output voltages V ₁ , V ₂ are combined with each other (V
₁ + V ₂ ), a normal output voltage V _OUT without voltage imbalance indicated by a dotted line in FIG. 4 can be obtained.

In the configuration described above, each resolver 30,
In both cases, two-phase output of one-phase excitation was used.
It goes without saying that the present invention can be applied to other input / output modes such as phase output. Although the case where a pair of resolvers is provided in one case has been described, the same effect can be obtained by providing one resolver in each of two cases and connecting them. Also, the excitation side and the output side can be used relatively oppositely. Also, FIGS. 1, 6, 8, and 11 show a stator having four slots and a winding method. However, it is needless to say that the present invention can be applied to a stator having any number of slots other than four slots. That is not.

[0014]

Since the angle detector according to the present invention is configured as described above, the following effects can be obtained. That is, since the origin positions of the stator and the rotor of the pair of resolvers are arranged to be shifted from each other by 180 ° and the output voltages of the respective resolvers are combined, the final output voltage is the conventional output voltage despite the misalignment of the stator. Such a voltage imbalance is cancelled, so that a high-precision output voltage can be obtained, and the finishing accuracy of the stator can be loosened to obtain an inexpensive resolver.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an angle detector according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a connection diagram of the windings of FIG. 1;

FIG. 4 is a waveform diagram of an output voltage.

FIG. 5 is a sectional view showing a conventional angle detector.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a connection diagram of FIG. 5;

FIG. 8 is a configuration diagram of FIG. 5;

FIG. 9 is an output voltage waveform diagram.

FIG. 10 is an output voltage waveform diagram.

FIG. 11 is a configuration diagram showing misalignment.

FIG. 12 is an output voltage waveform diagram of FIG. 11;

FIG. 13 is a composite output waveform diagram of FIG.

FIG. 14 is a diagram illustrating the principle of a conventional wound resolver.

FIG. 15 is a vector diagram of FIG. 14;

[Explanation of symbols]

 2, 2A Stator 2X, 2Y, 5X, 5Y Origin position 3, 3A Exciting winding 4, 4A Output winding 5, 5A Rotor 30, 40 Variable reluctance resolver

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B ^7/ 30-7/34 102 G01B 21/00-21/32 G01D 5/00-5/252 G01D 5 / 39-5/62

Claims (2)

(57) [Claims] 1. A pair of variable reluctance resolvers (30,
40) are arranged on the same axis, and the respective origin positions (2X, 2Y, 5X, 5Y) of the respective stators (2, 2A) and the rotors (5, 5A) of the respective variable reluctance resolvers (30, 40) are set at 180 degrees from each other. ° and connected to each other, and each excitation winding (3, 3A) and each output winding (4, 4A) of each of the variable reluctance resolvers (30, 40) are connected in series with each other. Angle detector. 2. The variable reluctance resolver (30,
40) The rotor (5, 5A) of (40) is provided such that the gap permeance between the rotor and the stator changes by an SIN function depending on the eccentricity or the rotation angle with respect to the rotation axis (6). 2. The angle detector according to 1.