JP3865617B2 - Angle sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an angle sensor, and in particular, a rotating disk is rotatable with respect to a fixed disk, a resolver is formed by a coil pattern provided on each disk, and an incremental encoder is formed by a slit provided on each disk. The present invention relates to a new improvement for providing a low-cost absolute encoder at low cost.
[0002]
[Prior art]
Conventionally, as this type of angle sensor that has been used, in order to realize a highly accurate absolute angle sensor, a rotary code plate having a complicated slit pattern is used and a precise optical signal processing system is used. .
In the case of a resolver using a winding and a core, the stator and the rotor are wound.
[0003]
[Problems to be solved by the invention]
Since the conventional angle sensor is configured as described above, the following problems exist.
That is, in the case of an absolute encoder, a great cost is required to form the rotary code plate, which has been the biggest obstacle to mass production.
Further, since the resolver uses a winding and a laminated core, the winding must be performed by a special winding machine, and it is extremely difficult to reduce the cost of the winding process. Furthermore, it was not easy to manufacture a laminated core.
Further, this resolver is not suitable for angle detection with extremely high accuracy, and it has been difficult to go beyond an optical encoder.
[0004]
The present invention has been made to solve the above-described problems. In particular, the rotating disk can be rotated with respect to the fixed disk, and a resolver is formed by a coil pattern provided on each disk, and is provided on each disk. Another object of the present invention is to provide an angle sensor in which an incremental encoder is formed by a slit and a high-precision absolute encoder is provided at a low cost.
[0005]
[Means for Solving the Problems]
An angle sensor according to the present invention includes a fixed platen having a fixed arrangement, one or a plurality of fixed slits formed on a peripheral surface of the fixed platen, and a plurality of resolver fixings formed inside the fixed slits of the fixed platen. A coil pattern, a fixed connection pattern having a spiral shape provided inside each fixed coil pattern for each resolver of the fixed plate, and each resolver for connecting both ends of each fixed coil pattern for each resolver in series with each other On the opposite surface of the fixed coil pattern, it overlaps with this and the fixed connection pattern located inside thereof, the rotating disk provided to be rotatable facing the fixed disk, and the fixed slit formed on the peripheral surface of the rotating disk And a number of rotating slit patterns for the resolver that are formed on the rotating disk and face the fixed coil pattern for the resolver. , The rotating coil pattern for the resolvers for the rotational connection patterns connects both ends in series with each other in the rotating coil pattern each resolver constituting the rotating disk of the provided inside of the rotating coil pattern the resolvers spiral And a rotating connection pattern positioned on the inner side of the rotating disk, a light source positioned above the rotating disk, and a light receiver positioned below the rotating disk, and the fixed coil pattern for each resolver. And a resolver rotating coil pattern, and the fixed slit and the rotating slit constitute an incremental encoder, and the coarse encoder synthesizes the incremental encoder signal from the photoreceptor and the resolver signal from the fixed connection pattern. The absolute signal is obtained by inputting to the circuit .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an angle sensor according to the present invention will be described with reference to the drawings.
In FIG. 1, a reference numeral 1 denotes a fixed platen, and one or a plurality of fixed slits 2 penetrating through the peripheral surface 1a of the fixed platen 1 are formed by known etching or the like.
On the inner peripheral surface 1a of the fixed platen 1, as shown in FIG. 2, a resolver fixed coil pattern 3 is formed in the same pattern as a later-described resolver rotating coil pattern 10 by well-known etching or photolithography. Is formed.
[0007]
The resolver fixed coil pattern 3 is formed at an inner position along the radial direction of the fixed platen 1 with respect to the fixed slit 2. The slit 2 and the pattern 3 as well as the later-described slit 5 and the pattern 10 can be formed simultaneously.
A rotating plate 4 is rotatably provided facing the fixed plate 1, and the fixed plate 1 and the rotating plate 4 are actually provided in a case (not shown). Here, the rotating plate 4 is rotatable. Since the structure held in is well known, it is omitted.
[0008]
As shown in FIG. 2, a large number of rotating slits 5 penetrate the peripheral surface 4 a of the rotating disk 4 along the radial direction and at a predetermined angular interval in the circumferential direction, like the fixed slit 2. Is formed.
Note that the fixed slit 2 is configured such that the rotational slit 5 and the positional relationship in the axial direction coincide with each other.
[0009]
A resolver rotating coil pattern 10 is formed on the inner surface of the rotating disk 4 facing the fixed disk 1 by etching, photolithography, or the like formed in the same pattern as the fixed pattern 3 for the resolver.
The resolver fixed coil pattern 3 and the resolver rotating coil pattern 10 are formed in the same pattern as the resolver rotating coil pattern 10 shown in FIG. 2 as described above, and the patterns 3 and 10 face each other. Thus, the resolver 20 is configured.
Wherein both ends of each pattern 3 and 10 are serially connected to each other by a fixed connection patterns 30 A and the rotating connection pattern 30 indicated by dotted lines to each other as shown in FIG. 2, fixed connection patterns 31 A formed in a spiral shape In addition , both ends of the patterns 3 and 10 connected in series are connected to the rotational connection pattern 31 .
The fixed connection pattern 30A and the rotary connection pattern 30 are overlapped with each other on the opposite surfaces 3a and 10a of the fixed coil pattern 3 for resolver and the rotary coil pattern 10 for resolver, and are positioned on the inside thereof. It is formed to do.
[0010]
A light source 32 is provided above (outside) the rotating plate 4, and light 32 a from the light source 32 passes through the fixing slit 2 of the fixing plate 1 through the rotating slit 5 of the rotating plate 4. Is received by the light receiving body 33 located below (outside) the light source 32, the rotary slit 5, the fixed slit 2, and the light receiving body 33 constitute an optical incremental encoder 34.
[0011]
The resolver fixed pattern 3 of the resolver 20 is used for excitation and detection like a well-known resolver. By rotating the resolver rotating coil pattern 10 of the turntable 4, the magnetic pattern between the patterns 3 and 10 is used. The resolver signal 40 indicating the rotation angle (number) of the rotating disk 4 is output by the action.
[0012]
The photoreceptor 33 outputs an incremental encoder signal 41 from the incremental encoder 34, and the resolver signal 40 is input to a coarse signal generating R / D conversion circuit 50 for R / D (resolver / digital) conversion. Is then input to the fine signal synthesis circuit 51.
The incremental encoder signal 41 from the photoreceptor 33 is input to a fine signal generation A / D (analog / digital) conversion circuit 52 and A / D converted, and then input to the fine signal synthesis circuit 51 to be a resolver signal. 40 is interpolated and synthesized.
In the fine signal synthesizing circuit 51, the coarse signal, that is, the rotation speed of the rotating disk 4 is detected by the input resolver signal 40, and the fine signal, that is, the rotation angle within one rotation of the rotating disk 4 is detected by the incremental encoder signal 41. An absolute signal 52 composed of a fine signal indicating the rotation speed and the rotation angle is output from the fine signal synthesis circuit 51.
Each of the boards 1 and 4 is made of a well-known material and thickness in which the slits 2 and 5 can be easily removed by etching or the like.
[0013]
【The invention's effect】
Since the angle sensor according to the present invention is configured as described above, the following effects can be obtained.
That is, by configuring the resolver with each print pattern of the fixed platen and the rotary platen, it is possible to achieve a reduction in the number of parts, simplification and man-hour reduction of coil manufacturing, reduction in coil manufacturing variation and higher accuracy than before. it can.
Further, since the incremental encoder is configured by using the slits of the fixed plate and the rotary plate, the encoder can be integrated with the resolver, and a flat and small high-precision absolute angle sensor can be obtained.
Each slit and pattern can be simultaneously formed by etching or photolithography on the stationary platen and the rotating platen, and can be manufactured at a very low cost.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an angle sensor according to the present invention.
2 is a configuration diagram showing a back surface of the turntable 4 of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed platen 1a Perimeter surface 2 Fixed slit 3 Fixed coil pattern for resolver 4 Rotating disc 4a Perimeter surface 5 Rotating slit 10 Rotating coil pattern for resolver 20 Resolver 32 Light source 33 Photoreceptor 34 Incremental encoder 40 Resolver signal 41 Incremental encoder signal
3a, 10a opposite side
30 rotation connection pattern
30A fixed connection pattern
31 Rotary connection pattern
31A Fixed connection pattern
51 Rough signal synthesis circuit
52 Absolute signal

Claims (1)

A fixed platen (1) having a fixed arrangement, one or a plurality of fixed slits (2) formed on a peripheral surface (1a) of the fixed platen (1), and a fixed slit (2) of the fixed platen (1) with a number of resolver stationary coil patterns formed on the inner side (3), said fixed connection patterns (31A which is provided on the inner side forms a spiral of each resolver stationary coil pattern (3) of said stationary platen (1) ) and the polymerization and fixed connection located inside thereto on the opposite side (3a) of said fixed coil pattern for the resolvers for connecting the two ends in series with each other for each resolver stationary coil pattern (3) (3) A pattern (30A) , a rotating disk (4) provided to be rotatable facing the fixed disk (1), and a fixed slit (2) formed on a peripheral surface (4a) of the rotating disk (4) A large number of rotating slits (5) that face each other, and a large number of resolvers that are formed on the rotating disk (4) and face the fixed coil pattern (3) for the resolver Rotating coil pattern (10) for the rotating plate, a rotating connection pattern (31) spirally provided inside the rotating coil pattern (10) for each resolver of the rotating disk (4) , and the rotating for each resolver opposite face of the rotating coil pattern for the resolvers for connecting both ends of the coil pattern (10) in series with each other (10) and which the polymerization and rotational connection patterns located on the inner side with (10a) (30), said rotating A light source (32) positioned above the panel (1), and a light receiver (33) positioned below the rotating disk (4), each of the fixed coil patterns (3) for the resolver and the rotating coil for the resolver The resolver (20) is configured by the pattern (10), the incremental encoder (34) is configured by the fixed slit (2) and the rotary slit (5 ), and the incremental encoder signal (41) from the photoreceptor (33 ). resole from the fixed connecting patterns (31A) An angle sensor, characterized in that to obtain an absolute signal (52) to input a signal (40) to the fine and coarse signal synthesizing circuit (51).

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