JP2804987B2 - Double speed rotation detector - Google Patents

Description

The present invention relates to a double-speed rotation detector, and more particularly, to an excitation signal which is simultaneously transmitted to a plurality of rotation detection units via a rotation transformer rotor of one rotation transformer. The present invention relates to a novel improvement for achieving a reduction in size, weight, and cost of an overall shape by supplying.

b. Conventional technology Conventionally, as a double-speed rotation detector such as this type of resolver used, there are various configurations electrically or mechanically coupled. Among them, a typical configuration will be described. As shown in, for example, the automatic control VOL7.NO2 issued in 1960, "digital-analog converter using resolver and its application", the applicant of the present invention shown in FIG. 3 to FIG. There is a well-known configuration manufactured in-house.

That is, what is indicated by reference numeral 1 in FIGS. 3 and 4 is a cylindrical casing, and a pair of bearings 2 and 3 provided at both ends of the casing 1 are provided with a rotating shaft 4 rotatably. Is provided.

On the inner wall 1a of the casing 1, a first rotary transformer stator 5 having a first rotary transformer stator winding 5a, a first rotation detector stator 6 having a first rotation detector stator winding 6a, Stator winding for two-turn transformer
The second rotation transformer stator 7 having the first rotation transformer 7a and the second rotation detection section stator 8 having the second rotation detection section stator winding 8a are fixed to each other at a predetermined interval with a casing spacing member 9 interposed therebetween. It is provided.

A rotor winding for a first rotary transformer is provided on the rotary shaft 4.
The first rotation transformer rotor 10 having the first rotation detection rotor 10a and the first rotation detection unit rotor 1 having the first rotation detection rotor winding 11a
1. Rotor 12 for second rotary transformer having rotor winding 12a for second rotary transformer and rotor winding 13 for second rotation detector
The second rotation detecting unit rotor 13 having a is provided fixedly at a predetermined interval from each other with a rotating shaft spacing member 14 interposed therebetween.

The first rotating transformer 15 is rotated by the first rotating transformer stator 5 and the first rotating transformer rotor 10, and the first rotating transformer 15 is rotated by the first rotation detecting unit stator 6 and the first rotation detecting rotor 11. The detector 16 is connected to the second rotary transformer 17 by the second rotary transformer stator 7 and the second rotary transformer rotor 12, and the second rotary transformer stator 8 is connected to the second rotary transformer 17.
And a second rotation detecting unit rotor 13 to form a second rotation detecting unit.
18 respectively.

Therefore, each of the rotation transformers 15 and 17 and each rotation detection unit
The electrical connection of 16 and 18 is configured as shown schematically in FIG. 4, and the first rotation detecting unit input from the first rotary transformer stator winding 5a of the first rotary transformer 15 The excitation signal input 20 is supplied from the rotor winding 10a for the first rotation transformer to the rotor winding 11a for the first rotation detection unit via the connection line 10aA shown in FIG. The detection signal output 21 for the first rotation detection unit can be obtained from the line 6a as a rotation detection signal (a signal 1X output every 360 °).

In addition, an excitation signal input for the second rotation detection unit input from the second rotation transformer stator winding 7a of the second rotation transformer 17 is input.
Reference numeral 22 denotes a second rotation detecting unit rotor winding 13a from the second rotation transformer rotor winding 12a via a connection line 10aA shown in FIG.
a, and a second rotation detection unit detection signal output 23 as a rotation detection signal (eg, a signal 10X output every 36 °) can be obtained from the second rotation detection unit stator winding 8a. , The number of rotations and the rotation angle of the rotating shaft 4 can be detected.

Note that the electric connection shown in FIG. 4 described above is schematically shown in a simplified manner, so that the well-known electric connection is shown in more detail as shown in FIG. The electrical connections are shown only for the first rotation detector in FIG.
FIG. 6 shows the output voltage characteristic of FIG. 5, that is, the detection signal output 21 for the first rotation detecting section of FIG. That is, the same parts as those in FIG. 4 are denoted by the same reference numerals, but the first rotation detection unit rotor winding 11a is provided with a rotor winding 11b provided at a position having a 90 ° phase difference,
The stator winding 6a for the first rotation detecting section is provided with a stator winding 6b provided at a position having a phase difference of 90 °.

Therefore, as is well known, by applying the voltage E _R1-R2 = Esinwt to the excitation side R ₁ -R ₂ phase in FIG. 5, the output side S ₁ -S
_3-phase, cos of S ₂ -S The _four-phase two-phase in accordance with the rotation angle θ as shown in FIG. 6, the output signal of sin is obtained as a voltage value, 1 rotated by the phase of the voltage level Is obtained. Note that the output voltage described above is E _S1-S3 = KEsinwt · cos
θ, E _S2 −S4 = KE sinwt · sin θ (K is the transformation ratio, θ is the rotation angle, w is 2πf, t is seconds, f is the excitation frequency Hz, E is the input voltage V), and the signal is transmitted to the rotor. The first rotary transformer 15 is used. That is, a rotation detector such as a resolver or a synchro is constituted by the rotation detector 16 and the rotation transformer 15 that can obtain a voltage corresponding to the rotation angle.

The above-described configuration is the same as that of the first rotation detection unit in FIG.
A system in which one (one cycle) single-angle signal is output per rotation has been described. In this case, the number of poles is two, and by setting the number of poles to 2N, the second pole in FIG. Like the rotation detector, eight (eight periods) eight-fold signals are output in one rotation shown in FIG. 8, and ten (ten surroundings) ten-fold signals are easily obtained only by increasing the number of poles. be able to.

That is, although the output voltage characteristic of FIG. 7 shows FIG. 6 in more detail, when comparing the output voltage characteristics of FIG. 7 and FIG. 8, one cycle (as is well known, a single-size signal 1X) is used. And eight periods (as is well known, an eight-fold signal 8X). The above configuration is well known as described above, and is generally used at present for detecting rotating devices such as various machine tools, robots, Shinkansen, and airplanes.

c. Problems to be Solved by the Invention The conventional double speed detector has the following problems because it is configured as described above.

That is, since a rotation transformer for supplying an excitation signal to each rotation detection unit is required, the length in the axial direction is increased, and it is impossible to reduce the size, and the cost increases, and in recent years, It has been impossible to meet the demand for small detectors for miniaturization of robots, machine tools, etc.

The present invention has been made to solve the above problems, and in particular, by simultaneously supplying excitation signals to a plurality of rotation detection units via a rotation transformer rotor of one rotation transformer, the overall It is an object of the present invention to provide a double-speed rotation detector capable of achieving a small and lightweight shape and a low cost.

d. Means for Solving the Problems A double-speed rotation detector according to the present invention comprises a first rotor and a plurality of rotation speed detectors which are provided independently on a rotation axis and constitute a first rotation detection unit for outputting a single-angle signal. A second rotor constituting a second rotation detector for outputting an angular signal; and a rotary transformer comprising a rotary transformer rotor provided on the rotary shaft and a corresponding rotary transformer stator. In this configuration, one rotation transformer rotor supplies an excitation signal to the first rotor and the second rotor in the first rotation detection unit and the second rotation detection unit.

e. Operation In the double-speed rotation detector according to the present invention, since the excitation signal is simultaneously supplied from the rotor for the rotation transformer in one rotation transformer to the rotor windings for each rotation detection unit of each rotation detection unit, a plurality of In this case, only one rotary transformer is required for the rotation detecting section, so that the axial length can be greatly reduced and the cost can be significantly reduced.

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

Note that the same or equivalent parts as those in the related art will be described using the same reference numerals. Further, the operation of the resolver body is the same as that described in detail in the section of the conventional example, so that the description is omitted here to avoid duplication, and only the structure is described.

1 and 2 are a sectional view and a circuit diagram showing a double speed rotation detector according to the present invention.

In the figure, reference numeral 1 denotes a cylindrical casing, and a pair of bearings 2 and 3 provided at both ends of the casing 1 are rotatably provided with a rotating shaft 4.

On the inner wall 1a of the casing 1, there are provided a stator 5 for a rotary transformer having a stator winding 5a for a rotary transformer, a stator 6 for a first rotation detecting unit having a stator winding 6a for a first rotation detector, and a stator 6 for a second rotation detecting unit. The second rotation detecting unit stator 8 having the stator winding 8a is
Are fixedly provided at a predetermined interval from each other.

On the rotating shaft 4, a rotor winding 10a for a rotary transformer is provided.
, A first rotation detection unit rotor 11 having a first rotation detection unit rotor winding 11a, and a second rotation detection unit rotor 13 having a second rotation detection unit rotor winding 13a. The rotating shaft spacing members 14 are interposed, and are fixed to each other at a predetermined spacing.

The rotation transformer 15 is formed by the rotation transformer stator 5 and the rotation transformer rotor 10, and the first rotation detection unit 16 is formed by the first rotation detection unit stator 6 and the first rotation detection unit rotor 11. The second rotation detecting section 18 is constituted by the second rotation detecting section stator 8 and the second rotation detecting section rotor 13, and the first rotation detecting section 16 is provided as described in detail in the aforementioned conventional example. The second rotation detecting unit 18 is configured to output the 1 × angle signal 1X and the 10 × angle signal 10X by known means.

Therefore, the rotation transformer 15 and each of the rotation detectors 16 and 18
The schematic electrical connection of the rotary transformer 15 is configured as shown in FIG.
The excitation signal input 20 for the rotation detection unit input from 5a is connected to the connection line 10aA shown in FIG.
Are supplied to the rotor windings 11a and 13a for the rotation detection unit via the first rotation detection unit, and are output from the first rotation detection unit stator winding 6a as rotation detection signals (single-cycle signals 1X output in one cycle within 360 °). The detection signal output 21 for one rotation detection unit can be obtained.

In addition, the connecting wire 10a is connected to the rotary transformer rotor winding 10a.
The second rotation detection unit 18 receives the second rotation detection unit excitation signal input 20 input to the second rotation detection unit rotor winding 13a via A.
A second detection signal output 23 for the second rotation detection unit as a rotation detection signal (for example, a 10-times angle signal 10X output ten cycles within 360 °) can be obtained from the rotation winding for the detection unit stator winding 8a. As described above, the number of rotations and the rotation angle of the rotating shaft 4 can be detected.

The output from the second rotation detecting section 18 can be used to obtain an arbitrary double-angle signal by the combination of the number of poles of the winding or the core, and the number of rotation detecting sections is two or more. Can be set up.

Further, in the above-described embodiment, the case where the rotation detection is configured has been described. However, the same operation and effect can be obtained when configured as a well-known synchro.

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

That is, since the excitation signal is simultaneously supplied from the rotation transformer rotor in one rotation transformer to each rotation detection unit rotor winding of the plurality of rotation detection units, one rotation transformer is supplied to the plurality of rotation detection units. Thus, the length in the axial direction can be greatly reduced, and the cost can be significantly reduced.

[Brief description of the drawings]

1 and 2 are a sectional view and a circuit diagram showing a double-speed rotation detector according to the present invention, FIGS. 3 and 4 are sectional views and a circuit diagram showing a conventional structure, and FIG. 4 is a circuit diagram specifically showing the first rotation detecting unit system, FIG. 6 is a characteristic diagram showing the output voltage of FIG. 5, FIG. 7 is a characteristic diagram specifically showing FIG. 6, and FIG. FIG. 4 is a characteristic diagram showing an octuple-size signal. 4 is a rotating shaft, 5 is a stator for a rotary transformer, 10 is a rotor for a rotary transformer, 11 is a first rotor, 13 is a second rotor, 15
Denotes a rotation transformer, 16 denotes a first rotation detection unit, 18 denotes a second rotation detection unit, 20 denotes an excitation signal, 21 denotes a single-size signal, and 23 denotes a multiple-size signal.

Claims (1)

(57) [Claims] A first rotation detector (1) provided independently of each other on a rotation shaft (4) for outputting a single-size signal (21).
6) First rotor (11) and several-fold angle signal (23)
A second rotation detecting unit (18) for outputting the rotation
A rotor having a rotor (13) and a rotary transformer (15) comprising a rotary transformer rotor (10) provided on the rotary shaft (4) and a corresponding rotary transformer stator (5). In the high-speed rotation detector, one rotor for the rotary transformer is provided for the first rotor (11) and the second rotor (13) in the first rotation detector (16) and the second rotation detector (18). A double-speed rotation detector characterized in that an excitation signal (20) is supplied from (10).