JP2014048243A - Linear resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear resolver capable of enhancing transfer efficiency of a magnetic flux both in a resolver section and a transformer section and of increasing a transformation ratio.SOLUTION: The linear resolver 10 is a brushless-type linear resolver composed of a stationary portion 1 and a corresponding movable portion 5. The stationary portion 1 includes a stationary portion transformer 2 and a stationary portion resolver 3, and the movable portion 5 includes a movable portion transformer 6 and a movable portion resolver 7; a transformer section T being composed of the stationary portion transformer 2 and the movable portion transformer 6, the resolver section R being composed of the stationary portion resolver 3 and the movable portion resolver 7, and a size in a direction of movement being longer in portions receiving a magnetic flux than in portions generating the magnetic flux both in the transformer section T and the resolver section R.

Description

  The present invention relates to a linear resolver, and more particularly to a linear resolver capable of increasing the transmission efficiency of magnetic flux and increasing the transformation ratio.

A conventional resolver is a rotary type (rotary type), and is a sensor that detects an angle that is a displacement in the rotational direction. Rotating resolvers can be broadly classified and classified as follows.
(A) A type in which the rotor has windings (coils) and the signal lines connected to the windings are drawn. The rotation range of the rotor is a finite angle.
(B) The rotor has windings and has a brush. Signal transmission to the rotor is a contact type using a brush. There is no limit on the rotation range of the rotor.
(C) Brushless type with windings on the rotor. It is a non-contact type in which a signal is transmitted to the rotor by a rotary transformer. There is no limit on the rotation range of the rotor.
(D) VR (Variable Reluctance) type with no windings on the rotor. Non-contact type. There is no limit on the rotation range of the rotor.

  On the other hand, there is a linear resolver as a sensor for detecting a displacement in a linear direction (Patent Documents 1 and 2). These linear resolvers are composed of a fixed part configured in a linear direction and a movable part arranged and operated on the fixed part. According to the classification in the rotary resolver described above, the linear resolver is of the (d) VR type. That is, no winding is provided on the movable part. Further, a linear winding type detector which is the same type of sensor is also conventionally known (Patent Document 3). According to the above classification, this is (a) a finite type with a limited rotation range, or (d) a VR type.

There are problems with conventional linear resolvers and linear winding detectors. That is, the conventional linear resolver has poor detection accuracy. Further, when the linear winding type detector is a VR type, the detection accuracy is inferior. When the linear winding type detector is a finite type, the signal line is swayed during operation, so that metal fatigue occurs and there is a risk of disconnection. Therefore, the inventors of the present invention invented the brushless type as described below for the purpose of providing a linear resolver that has high detection accuracy, prevents disconnection due to metal fatigue in the signal line, and is less likely to fail and has a long product life. And filed a patent application.
“In a linear resolver composed of a movable part and a fixed part, which are sensors for detecting displacement in the linear direction, the movable part is provided with a transformer coil and a resolver coil, and a corresponding transformer is provided in the fixed part. A linear resolver in which a coil and a resolver coil are provided and there is no signal line drawn out from the movable part ”(Patent Document 4). )

Japanese Patent Laid-Open No. 6-221870 “Linear Resolver” Japanese Patent Laid-Open No. 6-300583 “Linear Resolver” Japanese Patent Laid-Open No. 10-25339 “Linear Winding Detector” Japanese Patent Application No. 2011-087301 “Linear Resolver” (undisclosed)

  FIG. 7 shows a basic configuration of the linear resolver described in Patent Document 4. As shown in the figure, there are two parts that generate magnetic flux in the linear resolver 9910: (a) the transformer coil part 997 of the fixed part 996 and (b) the resolver coil part 993 of the movable part 991. On the other hand, there are two parts that receive the magnetic flux: (c) the transformer coil part 992 of the movable part 991 and (d) the resolver coil part 998 of the fixed part 996. Then, (a) and (c) form a transformer part as a pair, and (b) and (d) constitute a resolver part as a pair.

  Here, when (b) and (d) of the resolver part are compared, (d) is dimensionally longer than (b). That is, the part that receives the magnetic flux is dimensionally longer than the part that generates the magnetic flux. When the part that receives the magnetic flux is longer in dimension than the part that generates the magnetic flux, most of the generated magnetic flux can be received, and the transmission efficiency of the magnetic flux is high. Therefore, the transformation ratio is high.

  On the other hand, when (a) and (c) of the transformer part are compared, (c) is dimensionally shorter than (a). That is, the part that receives the magnetic flux is shorter in dimension than the part that generates the magnetic flux. When the part that receives the magnetic flux is shorter in dimension than the part that generates the magnetic flux, there is a portion that cannot be received in the generated magnetic flux, and thus the transmission efficiency of the magnetic flux is low. Therefore, the transformation ratio becomes low.

  Therefore, the problem to be solved by the present invention is to provide a linear resolver that can increase the transmission efficiency of magnetic flux in both the resolver section and the transformer section and increase the transformation ratio.

  As a result of studying the above problems, the inventor of the present application has conceived that the problem can be solved by making the size of the part that receives the magnetic flux longer than the part that generates the magnetic flux in both the resolver part and the transformer part. It was. That is, the invention claimed in the present application, or at least the disclosed invention, as means for solving the above-described problems is as follows.

(1) A brushless type linear resolver comprising a fixed part and a movable part corresponding thereto, wherein the fixed part comprises a fixed part transformer and a fixed part resolver, and the movable part is a movable part transformer and a movable part resolver. Each of the fixed part transformer and the movable part transformer comprises a transformer part, and each of the fixed part resolver and the movable part resolver comprises a resolver part, and any of the transformer part and the resolver part. In the linear resolver, the dimension in the moving direction is longer in the part receiving the magnetic flux than in the part generating the magnetic flux.
(2) The linear resolver according to (1), wherein both the fixed portion and the movable portion are plate-shaped.
(3) The fixed part includes a fixed part coil holding body, a fixed part transformer coil and a fixed part resolver coil arranged on the fixed part coil holding body, and the movable part includes a movable part coil holding body and The linear resolver according to (2), comprising a movable part transformer coil and a movable part resolver coil arranged on the movable part coil holder.

(4) The fixed part transformer is configured by winding a fixed part transformer coil around a fixed part transformer iron core, and a gap part is formed in the fixed part transformer iron core to move the movable part described later, The fixed part resolver is configured by winding a fixed part resolver coil around a tooth (fixed part teeth) provided in a fixed part core, and the movable part is formed integrally with the movable part transformer and the movable part resolver. The part resolver is configured by winding a movable part resolver coil around a tooth (movable part tooth) provided in a movable part core, the movable part transformer passes through the gap, and the movable part tooth is fixed to the fixed part tooth. The linear resolver according to (1), wherein each component is arranged so as to oppose to the linear resolver.
(5) The linear resolver according to (2) or (3), wherein a planar shape of at least one of the fixed portion and the movable portion is a rectangle or a key shape.

  Since the linear resolver of the present invention is configured as described above, according to this, in the linear resolver that is a sensor for detecting the displacement in the linear direction, the transmission efficiency of the magnetic flux is improved in both the resolver unit and the transformer unit. Can be increased, thereby increasing the transformation ratio.

It is a top view which shows the basic composition of the linear resolver (planar type) of this invention. It is explanatory drawing of the planar view and side view which show the operation | movement in the linear resolver shown in FIG. 1 (the 1). It is explanatory drawing of the planar view and side view which show the operation | movement in the linear resolver shown in FIG. 1 (the 2). FIG. 6 is an explanatory diagram of the operation in the linear resolver shown in FIG. 1 in a plan view and a side view (part 3). It is explanatory drawing which shows the specific structural example of the linear resolver (planar type) of this invention. It is a wiring diagram in the linear resolver of FIG. It is a top view which shows the other structural example of the linear resolver (planar type) of this invention. It is explanatory drawing which shows the structural example of the linear resolver (three-dimensional type) of this invention. It is a side view of the linear resolver of FIG. 6A. It is explanatory drawing which shows the basic composition of the linear resolver of patent document 4.

Hereinafter, the present invention will be described in detail with reference to the drawings. The linear resolver of the present invention includes a planar type and a three-dimensional type, which will be described in order.
FIG. 1 is a block diagram showing a basic configuration of a linear resolver (planar type) according to the present invention. As shown in the figure, the linear resolver 10 is a brushless type linear resolver including a fixed portion 1 and a movable portion 5 corresponding to the fixed portion 1, and the fixed portion 1 includes a fixed portion transformer 2 and a fixed portion resolver 3. The movable portion 5 includes a movable portion transformer 6 and a movable portion resolver 7, and a transformer portion T is constituted by each portion of the fixed portion transformer 2 and the movable portion transformer 6, and a resolver is formed from each portion of the fixed portion resolver 3 and the movable portion resolver 7. The main part is that the part R is configured, and in both the transformer part T and the resolver part R, the dimension in the moving direction is longer in the part receiving the magnetic flux than the part generating the magnetic flux. Thus, in both the transformer part T and the resolver part R, the transmission efficiency of the magnetic flux is increased and the transformation ratio is increased by making the dimension of the part that receives the magnetic flux longer than the part that generates the magnetic flux. .

  2A, 2B, and 2C are explanatory views of a plan view and a side view showing the operation of the linear resolver shown in FIG. 1, that is, how the movable part moves. FIG. 2A shows a state in which the movable part 5 is located on the left side with respect to the fixed part 1, and each subsequent figure shows a process in which the movable part 5 moves to the right. First, the transformer section (T in FIG. 1) will be described with reference to side views of the drawings. The moving direction dimension of the movable part transformer 6 is longer than that of the fixed part transformer 2. That is, since the movable part transformer 6 that receives the magnetic flux is longer in dimension than the fixed part transformer 2 that generates the magnetic flux, the movable part transformer 6 is moved during the movement of the movable part 5 relative to the fixed part 1. The magnetic flux generated in the fixed part transformer 2 can be received to the maximum, the transmission efficiency of the magnetic flux is increased, and the transformation ratio is increased.

  Next, the resolver portion (R in FIG. 1) will be described with reference to plan views of the respective drawings. The moving direction dimension of the fixed part resolver 3 is longer than that of the movable part resolver 7. That is, since the fixed part resolver 3 that is a part that receives the magnetic flux is dimensionally longer than the movable part resolver 7 that is a part that generates magnetic flux, the fixed part resolver 3 is moved during the movement of the movable part 5 relative to the fixed part 1. The magnetic flux generated by the movable part resolver 7 can be received to the maximum, the transmission efficiency of the magnetic flux is increased, and the transformation ratio is increased.

  Thus, in the linear resolver 10 of the present invention, in both the transformer part T and the resolver part R, the size of the part that receives the magnetic flux is longer than the part that generates the magnetic flux. Can be increased. As shown in each drawing, the flat linear resolver 10 is configured such that the fixed portion 1 and the movable portion 5 are both plate-shaped.

  FIG. 3 is an explanatory view showing a specific configuration example of the linear resolver (planar type) of the present invention, and shows a plan view and a side view of the movable portion on the left and the fixed portion on the right. As shown in the figure, in the present linear resolver 210, the fixed portion 21 is composed of a fixed portion coil holding body 24, a fixed portion transformer coil 22 and a fixed portion resolver coil 23 disposed on the fixed portion coil holder 24, while the movable portion 25. Comprises a movable part coil holder 28, a movable part transformer coil 26 and a movable part resolver coil 27 disposed thereon.

  FIG. 4 is a wiring diagram of the linear resolver of FIG. The wiring structure shown in the figure is common to a three-dimensional linear resolver described later. As described above, in the present invention, it is necessary to make the dimension of the part that receives the magnetic flux longer than the part that generates the magnetic flux, so the signal processing format of the resolver is a one-phase excitation two-phase output type.

  The planar shape of the planar linear resolver described above is not limited to the illustrated one. For example, as illustrated in FIG. 5, the planar shape of at least one of the fixed portion and the movable portion may be a rectangle or a key shape.

FIG. 6A is an explanatory diagram showing a configuration example of a linear resolver (three-dimensional type) according to the present invention. Also,
6B is a side view of the linear resolver of FIG. 6A. As shown in these figures, the three-dimensional linear resolver 610 of the present invention includes a fixed portion provided separately to a fixed portion transformer 62 and a fixed portion resolver 63, and a movable portion 65.

  The fixed part transformer 62 is configured by winding a fixed part transformer coil 622 around a fixed part transformer iron core 621, and the fixed part transformer iron core 621 is formed with a gap 629 for moving the movable part 65 therethrough. The fixed portion resolver 63 is configured by winding a fixed portion resolver coil 633 around a tooth (fixed portion teeth) 638 provided on the fixed portion core 631.

  Further, the movable part 65 is formed by integrally forming a movable part transformer 66 and a movable part resolver 67, and the movable part resolver 67 is provided with a movable part resolver coil 677 on a tooth (movable part tooth) 678 provided on the movable part core 671. It is wound and configured. Then, the fixed part transformer 62, the fixed part resolver 63, and the movable part 65 are arranged so that the movable part transformer 66 passes through the gap part 629 and the movable part tooth 678 faces the fixed part tooth 638, and the linear resolver 610 as a whole. Is configured. The fixed part transformer 62 and the movable part transformer 66 constitute a transformer part, and the fixed part resolver 63 and the movable part resolver 67 constitute a resolver part.

  The operation of this linear resolver 610 will be described with this configuration. First, in the transformer portion, the moving direction dimension of the movable portion transformer 66 is longer than that of the fixed portion transformer 62. That is, since the movable part transformer 66 that receives the magnetic flux is dimensionally longer than the fixed part transformer 62 that generates the magnetic flux, the movable part 65 is movable during the movement of the movable part 65 relative to the fixed parts (62, 63). The part transformer 66 can receive the magnetic flux generated by the fixed part transformer maximally, the transmission efficiency of the magnetic flux becomes high, and the transformation ratio becomes high.

  Next, in the resolver part, the moving direction dimension of the fixed part resolver 63 is longer than that of the movable part resolver 67. That is, since the fixed part resolver 63 that receives the magnetic flux is dimensionally longer than the movable part resolver 67 that generates the magnetic flux, the fixed part resolver 63 is fixed during the movement of the movable part 65 with respect to the fixed parts (62, 63). The part resolver 63 can receive the magnetic flux generated by the movable part resolver 67 as much as possible, the transmission efficiency of the magnetic flux is increased, and the transformation ratio is increased.

  As described above, in the three-dimensional linear resolver 610 of the present invention, as in the flat type, in both the transformer part and the resolver part, the size of the part that receives the magnetic flux is longer than the part that generates the magnetic flux. The transmission efficiency can be increased and the transformation ratio can be increased.

  According to the linear resolver of the present invention, the magnetic flux transmission efficiency can be increased in the linear resolver which is a sensor for detecting the displacement in the linear direction, and thereby the transformation ratio can be increased. Therefore, the present invention is highly industrially applicable in all fields of sensor manufacture and use.

1, 21, 31, 41 ... fixed part 2, 32, 42 ... fixed part transformer 3, 33, 43 ... fixed part resolver 4, 24, 34, 44 ... fixed part coil holder 5, 25, 35, 45 ... movable Part 6, 36, 46 ... Movable part transformer 7, 37, 47 ... Movable part resolver 8, 28, 38, 48 ... Movable part coil holder 10, 210, 310, 410 ... Linear resolver 22 ... Fixed part transformer coil 23C ... Fixed part resolver coil (COS side)
23S: Fixed part resolver coil (SIN side)
26 ... movable part transformer coil 27 ... movable part resolver coil 29R1, 29R2 ... input signal lines 29S1, 29S2, 29S3, 29S4 ... output signal lines

610 ... Linear resolver 62 ... Fixed part transformer 621 ... Fixed part transformer core 622 ... Fixed part transformer coil 629 ... Gap part 63 ... Fixed part resolver 631 ... Fixed part core 633 ... Fixed part resolver coil 638 ... Fixed part teeth 65 ... Moving part 66 ... Movable part transformer 662 ... Movable part transformer coil 67 ... Movable part resolver 671 ... Movable part core 677 ... Movable part resolver coil 678 ... Movable part teeth T, 3T, 4T ... Transformer part R, 3R, 4R ... Resolver part 991 ... Movable part 992 ... transformer coil part 993 ... resolver coil part 996 ... fixed part 997 ... transformer coil part 998 ... resolver coil part 9910 ... linear resolver

Claims (4)

A brushless type linear resolver comprising a fixed portion and a movable portion corresponding thereto, wherein the fixed portion includes a fixed portion transformer and a fixed portion resolver, and the movable portion includes a movable portion transformer and a movable portion resolver. The fixed part transformer and the movable part transformer each part constitutes a transformer part, and the fixed part resolver and the movable part resolver each part constitutes a resolver part. In both the transformer part and the resolver part, The linear resolver is characterized in that a portion receiving magnetic flux is formed longer in a moving direction than a portion generating magnetic flux. The linear resolver according to claim 1, wherein both the fixed portion and the movable portion are plate-shaped. The fixed part includes a fixed part coil holder, a fixed part transformer coil and a fixed part resolver coil disposed on the fixed part coil holder, and the movable part includes the movable part coil holder and the movable part. The linear resolver according to claim 2, comprising a movable part transformer coil and a movable part resolver coil arranged on the partial coil holder. The fixed part transformer is configured by winding a fixed part transformer coil around a fixed part transformer iron core, and a gap part is formed in the fixed part transformer iron core to move the movable part described later. Is formed by winding a fixed part resolver coil around teeth (fixed part teeth) provided in a fixed part core, the movable part is formed integrally with the movable part transformer and the movable part resolver, and the movable part resolver is A movable part resolver coil is wound around a tooth (movable part tooth) provided in the movable part core, the movable part transformer passes through the gap, and the movable part tooth faces the fixed part tooth. The linear resolver according to claim 1, wherein the constituent elements are arranged as described above.

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