JP2011017584A - Sheet coil type resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet coil type resolver having high accuracy of angle detection by reducing mutual interference of a magnetic flux generated from a transformer coil and a resolver coil, respectively.SOLUTION: A core of a rotor part 201 is separated into a rotor core 212a served as a core of rotor transformer coils 215a, 215b and a rotor core 212b served as a core of excitation coils 216, 217. Further, a core of a stator part 202 is separated into a stator core 232a served as a core of a stator transformer coil 235a and a stator core 232b served as a core of a detection coil 236. Thereby, magnetic mutual interference between the transformer coil and the resolver coil type is reduced.

Description

  The present invention relates to a sheet coil type resolver in which a conductor is constituted by a sheet coil.

  As a conventional sheet coil type resolver, a single-phase excitation coil formed by a planar sheet coil so that the angle of each pole of the number X of pole pairs is 180 ° in electrical angle, and an excitation coil via a gap There is known a configuration including a detection coil composed of two phases of an A phase and a B phase coil having a phase difference of 90 ° in electrical angle formed by planar sheet coils facing each other (for example, Patent Document 1). reference).

  In this configuration, the exciting coil is disposed on the rotor side. A transformer coil (secondary winding) for supplying an exciting current to the exciting coil is disposed inside the exciting coil in the rotor. Moreover, these two coils are arrange | positioned facing the disk-shaped rotor core.

  A stator-side transformer coil (primary winding) is disposed at a position facing the rotor-side transformer coil (secondary winding), and a transformer coil portion is formed by both transformer coils. Further, the stator is provided with the above-described A-phase detection coil and B-phase detection coil in a two-layer structure at a position corresponding to the excitation coil of the rotor, and a resolver is formed by the excitation coil and the A-phase and B-phase detection coils. A coil portion is formed. The transformer coil and the A-phase and B-phase detection coils in this stator are arranged facing the disk-shaped stator core.

Japanese Patent Laid-Open No. 8-136211

  However, the above-described configuration has a problem that the angle detection accuracy is low. This is due to the following reason. In the configuration described above, on the rotor side, the transformer coil and the excitation coil share the core. Also on the stator side, the transformer coil and the detection coil share a core.

  For this reason, magnetic flux interferes between a resolver coil part and a transformer coil part via a common core. For example, on the rotor side, the magnetic flux to be detected by the transformer coil reaches the exciting coil via the core. As a result, the magnetic flux generated by the exciting coil is affected by the magnetic flux generated by the transformer coil. Further, on the stator side, the magnetic flux generated by the transformer coil reaches the A-phase and B-phase detection coils via the core and is detected there. As a result, the influence of the magnetic flux of the transformer coil portion that should not be detected is included in the detection output.

  This phenomenon is a factor that decreases the angle detection accuracy. Therefore, an object of the present invention is to provide a sheet coil type resolver with high angle detection accuracy by reducing mutual interference of magnetic fluxes generated by the resolver coil section and the transformer coil section.

  According to a first aspect of the present invention, there is provided a sheet-like resolver stator coil portion disposed in the stator portion and a sheet-like resolver rotor coil portion disposed in the rotor portion rotatable relative to the stator portion. A resolver coil portion, a sheet-like stator transformer coil portion arranged concentrically with the resolver stator coil portion, and a sheet-like rotor transformer coil portion arranged concentrically with the resolver rotor coil portion. A transformer coil section, a first core disposed along a sheet surface of the resolver coil section, and serving as a core of the resolver coil section; a transformer core section disposed along the sheet surface of the transformer coil section; A second core serving as a core, wherein the first core and the second core are magnetically separated. A sheet coil type resolver.

  Here, a component having a resolver stator coil portion and a resolver rotor coil portion (one of which is an excitation coil and the other is a detection coil) is called a resolver coil portion. Further, a component having both of two transformer coils (stator transformer coil portion and rotor transformer coil portion) on the stator side and the rotor side is called a transformer coil portion.

  The invention described in claim 1 is based on the principle of suppressing interference of magnetic flux through the core by separating the cores of the resolver coil portion and the transformer coil portion without sharing them. The cores are separated only in the stator side, the rotor side, and three patterns of both the stator and the rotor. As will be described later, since the magnetic flux penetrates both the stator-side core and the rotor-side core, the effect can be obtained only by separating the one-side core. Of course, the structure in which the core is separated in both the stator and the rotor is most effective.

  The core is separated by increasing the magnetic resistance between adjacent cores so that the magnetic flux receives a large magnetic resistance at that portion. In other words, the cores are separated by preventing the formation of the magnetic path between the core of the resolver coil part and the core of the transformer coil part.

  According to a second aspect of the present invention, in the first aspect of the present invention, the first core and the second core are formed separately from each other.

  According to the invention described in claim 2, by separating the first core and the second core, the core is physically separated, thereby magnetic separation is performed.

  According to a third aspect of the present invention, in the first aspect of the invention, the first core and the second core are each partially coupled. According to this configuration, the first core and the second core are partially connected to each other. However, since the first core and the second core are partially connected to each other, the magnetic resistance at the portion is increased, and the coil core is magnetic. The structure is separated.

  As a partial coupling structure between the first core and the second core, a groove is formed in the vicinity of a boundary between a portion of the disk-shaped core member facing the first core and a portion corresponding to the second core. And a method of partially forming the slit, and the like. By forming the grooves or slits, the cross-sectional area of the magnetic path connecting the cores is reduced, and the magnetic resistance in that portion is increased. Thereby, the magnetic separation between the first core and the second core is performed.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the separation is performed by a gap formed between the first core and the second core. It is characterized by what has been done. According to the fourth aspect of the present invention, the high magnetic resistance portion is provided between the first core and the second core due to the gap between the cores, and the magnetism between the first core and the second core is provided. Separation is performed.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the separation is performed by a spacer disposed between the first core and the second core. It is characterized by.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the spacer includes a magnetic shield member, and the magnetic shield member is spaced apart from the first core and the second core. It is characterized by that. According to the invention described in claim 6, the magnetic shield member is located between the first core and the second core in a state of being separated from both the cores. For this reason, the magnetic separation between the first core and the second core is enhanced by the magnetic shield effect.

  The invention according to claim 7 is the invention according to claim 5, wherein the spacer is a part of a yoke that covers the outside of each core.

  The invention according to claim 8 is the invention according to claim 4, wherein at least one of the bent portion of the first core and the bent portion of the second core is arranged in the gap. . According to the eighth aspect of the invention, since the magnetic path is formed in the bent portion, the magnetic interference between the first core and the second core is reduced accordingly.

  According to the first aspect of the present invention, a mutual interference between magnetic fluxes generated by the transformer coil portion and the resolver coil portion is reduced, and a sheet coil resolver with high angle detection accuracy is provided.

  According to the second aspect of the present invention, since the first core and the second core are physically separated, the magnetic separation between them is more effectively performed.

  According to the third aspect of the present invention, the first core and the second core are magnetically separated by partially connecting the first core and the second core.

  According to the fourth aspect of the present invention, the magnetic separation between the first core and the second core is performed by the air gap.

  According to the fifth aspect of the invention, the magnetic separation between the first core and the second core is performed by the spacer.

  According to the sixth aspect of the present invention, the magnetic separation between the first core and the second core is further ensured by the magnetic shield structure.

  According to the seventh aspect of the present invention, the first core and the second core are magnetically separated using a part of the yoke.

  According to the eighth aspect of the present invention, the formation of the magnetic path between the first core and the second core is inhibited by forming the magnetic path in the bent portion, and the first core and the first core The magnetic separation from the two cores is further enhanced.

It is sectional drawing which shows the outline | summary of the AC servomotor provided with the sheet coil type resolver of embodiment. It is sectional drawing which shows the outline | summary of the sheet coil type | mold resolver of embodiment. It is a disassembled perspective view which shows the structure of the sheet coil type | mold resolver of embodiment. They are sectional drawing (a), (b) seen from the axial direction which shows the outline | summary of the excitation coil by the side of a rotor, and sectional side view (c) cut by the surface containing an axis | shaft. It is sectional drawing seen from the axial direction which shows the detection coil and transformer coil by the side of a stator. It is a conceptual diagram which shows the mode of the magnetic path in a sheet coil type | mold resolver, and is the conceptual diagram (a) in a prior art, and the conceptual diagram (b) in embodiment using this invention. It is a graph which shows the result of having calculated | required the voltage induced in a detection coil by simulation, and is the induced voltage (a) in the structure using an induced voltage (a) in a prior art, and invention. It is sectional drawing which shows the outline | summary of other embodiment. It is sectional drawing which shows the outline | summary of other embodiment. It is sectional drawing which shows the outline | summary of other embodiment. It is a front view which shows the shape of the core in other embodiment.

(1) First embodiment (overall configuration)
FIG. 1 is a cross-sectional view showing an outline of a motor equipped with a sheet coil resolver using the present invention. FIG. 1 shows a motor 100. The motor 100 is an AC servo motor and includes a shaft 101 serving as a rotation shaft. The shaft 101 is supported by bearings 102 and 103. The bearing 102 is attached to the motor housing 104, and the bearing 103 is attached to an end cap 108 fixed to the upper portion of the motor housing 104. With this structure, the shaft 101 is attached to the motor housing 104 in a rotatable state. Further, a motor rotor 105 composed of a permanent magnet having a structure magnetized by a plurality of magnetic poles is attached to the shaft 101.

  A motor stator core 106 is disposed outside the motor rotor 105 at a position slightly separated from the motor rotor 105. The motor stator core 106 is made of a magnetic material such as silicon steel and is fixed to the motor housing 104. The motor stator core 106 has a structure having salient poles corresponding to the number of magnetic poles, and the plurality of salient poles are arranged so as to surround the motor rotor 105 from the periphery.

  A motor winding 107 is wound around each magnetic pole of the motor stator core 106. The end of the motor winding 107 is drawn out of the motor housing 104 (not shown) and connected to a motor drive circuit not shown. Since this area is the same as that of a normal AC servo motor, detailed description is omitted.

  In the motor 100, a sheet coil type resolver 200 is integrated at the top, and angle information of the shaft 101 can be acquired. The sheet coil type resolver 200 includes a rotor part 201 and a stator part 202. The rotor part 201 is fixed to the shaft 101, and the stator part 202 is fixed to the end cap 108 (motor housing side). When the shaft 101 rotates with respect to the motor housing 104, the rotor unit 201 rotates with respect to the stator unit 202.

(Structure of sheet coil type resolver)
FIG. 2 is an enlarged cross-sectional view of the portion indicated by the symbol A in FIG. FIG. 3 is an exploded perspective view showing a state where the sheet coil resolver 200 shown in FIGS. 1 and 2 is disassembled. As shown in FIG. 2, the sheet coil resolver 200 includes a rotor part 201 and a stator part 202. The rotor part 201 and the stator part 202 are arranged to be spaced apart from each other in the axial direction with a gap, and are relatively rotatable. The sheet coil type resolver 200 has a configuration of n = 4 at an axial multiplication angle nX.

(Structure of the rotor part)
Hereinafter, the configuration of the rotor unit 201 will be described with reference to FIGS. 1 to 3. The rotor unit 201 includes a disk-shaped rotor yoke 211. The rotor yoke 211 is made of a non-magnetic material, and two rotor cores divided into two are fixed to the surface facing the stator portion 202. In this example, the first rotor core 212 a and the second rotor core 212 b are fixed to the surface of the rotor yoke 211 facing the stator portion 202.

  The rotor cores 212a and 212b are made of a magnetic material and have a disk shape with a hole formed in the center. The rotor cores 212a and 212b are concentrically arranged with a gap 301 and are spaced apart in the radial direction, and the rotor core 212a is arranged inside the rotor core 212b (on the shaft 101 side). The gap 301 is merely a gap, but a spacer made of a non-magnetic material such as a resin material may be disposed here to adjust the dimension of the gap 301 (the gap dimension between the rotor cores). .

  The rotor core 212a functions as a core for increasing the efficiency of rotor transformer coils 215a and 215b described later. The rotor core 212b functions as a core for increasing the efficiency of resolver rotor coils (excitation coils) 216 and 217, which will be described later.

  An insulating sheet 213 is fixed to the stator side of the rotor core 212a. The insulating sheet 213 is a sheet of resin material having a thin annular shape. The rotor transformer coil 215a is embedded in one surface (upper surface) of the insulating sheet 213, and the rotor transformer coil 215b is embedded in the other surface (lower surface). The rotor transformer coils 215a and 215b are formed of printed wiring and have a spiral shape with the shaft 101 as the center (not shown).

  An insulating sheet 214 is fixed to the stator side of the rotor core 212b. The insulating sheet 214 is a sheet of resin material having a thin annular shape that is disposed outside the insulating sheet 213. An excitation coil 216 is embedded in the upper surface of the insulating sheet 214 in FIG. 2, and an excitation coil 217 is embedded in the lower surface. The exciting coils 216 and 217 are configured by printed wiring and have a pattern shape and a connection structure to be described later.

  The rotor transformer coils 215a and 215b are connected in series (in-phase connection) so that induced currents in the same direction flow with respect to magnetic fluxes in the same direction, and both ends of the windings are connected to the excitation coils 216 and 217. Yes. The rotor transformer coils 215a and 215b have a role of receiving an excitation current from a stator transformer coil 235a described later by electromagnetic induction and supplying the excitation current to the excitation coils 216 and 217.

  The rotor core 212 a includes bent portions 302 and 303. The bent portion 302 is bent toward the stator side in the inner peripheral portion of the rotor core 212a and extends in the direction of the stator side core described later. The bent portion 303 is bent toward the stator side at the outer peripheral portion adjacent to the gap 301 of the rotor core 212a, and extends in the direction of the stator side core described later. The bent portions 302 and 303 are provided in order to intentionally form a magnetic path toward the stator side.

  Further, the rotor core 212b includes bent portions 304 and 305. The functions of the bent portions 304 and 305 are the same as those of the bent portions 302 and 303.

  As described above, the rotor unit 201 is fixed to the shaft 101 by the rotor core 212 a and is configured to be able to rotate together with the shaft 101. In addition, the core is separated into two cores (rotor cores 212a and 212b) by the gap 301, and the exciting coils 216 and 217 and the rotor transformer coils 215a and 215b have different cores.

  Next, the excitation coils 216 and 217 will be described. FIG. 4 is a cross-sectional view (a) and (b) showing the structure of the exciting coils 216 and 217 in the embodiment viewed from the axial direction, and a side cross-sectional view (c) cut along a plane including the shaft. FIG. 4A shows a pattern of the exciting coil 216 in the first layer (upper side in FIG. 2). FIG. 4B shows a pattern of the excitation coil 217 in the second layer (lower side in FIG. 2).

  As shown in FIG. 4, eight spiral coil patterns are formed in each layer as excitation coil patterns. That is, the excitation coil 216 includes excitation coil patterns 216a to 216h, and the excitation coil 217 includes excitation coil patterns 217a to 217h.

  The exciting coil patterns 216a to 216h are formed on the same plane, and adjacent coil patterns are in a positional relationship shifted by 45 ° (360 ° / 8) in mechanical angle when viewed from the axial direction. This also applies to the excitation coil patterns 217a to 217h. In addition, the exciting coil patterns 216a to 216h have a shape that spirals in the clockwise direction toward the center of the spiral as viewed from the viewpoint of FIG. 4, and the exciting coil patterns 217a to 217h are directed toward the center of the spiral. It has a shape that spirals counterclockwise.

  The exciting coils 216 and 217 are related to each other and integrally constitute a coil on the rotor side of the resolver. In this example, the lead wire 218 is drawn from the exciting coil pattern 216a, and the lead wire 219 is drawn from the exciting coil pattern 216h, and these two lead wires are connected to the rotor transformer coils 215a and 215b in FIG. Has been.

  Hereinafter, the connection structure of the excitation coil will be described along the flow of excitation current. Although the exciting current is an alternating current, here, in order to simplify the explanation, the explanation will be made along the flow of the exciting current flowing from the lead wire 218.

  The exciting current flowing in from the lead wire 218 flows inwardly so as to vortex the exciting coil pattern 216a in the clockwise direction, and is a through hole (for example, a sign of FIG. 4C) that conducts the front and back of the insulating sheet 214. 220) to the excitation coil pattern 217a of the second layer (back side). This current flows in the exciting coil pattern 217a so as to spiral in a clockwise direction from the center of the spiral toward the outside. As can be seen from this current flow, the magnetic flux generated by the first excitation coil pattern 216a and the magnetic flux generated by the second excitation coil pattern 217a are in the same direction, and the magnetic flux increases. That is, when considering the coil phase, the exciting coil pattern 216a and the exciting coil pattern 217a that are overlapped when viewed from the axial direction are in the same phase (the direction of the spiral is reversed).

  The current that has passed through the excitation coil pattern 217a flows to the excitation coil pattern 217b, where it flows toward the center of the spiral so as to wind in a counterclockwise direction. This current flows from the through hole to the first excitation coil pattern 216b where it flows in a counterclockwise direction from the center of the spiral toward the outside.

  As can be seen from the current flowing through the exciting coil patterns 216a and 216b, the direction of the current flowing through the adjacent exciting coil patterns 216a to 216h at a certain timing is the reverse rotation direction, and the magnetic flux generated by these coils is Are opposite to each other. This also applies to the excitation coil patterns 217a to 217h.

  As described above, the exciting coil pattern 216a → 217a → 217b → 216b → 216c → 217c → 217d → 216d → 216e → 217e → 217f → 216f → 216g → 217g → 217h → 216h flows through the exciting current 219. To. Since the excitation current is an alternating current, when the direction of periodic flow changes and the flow is in the opposite direction to the above case, the excitation current follows the reverse order from the lead line 219 toward the lead line 218. Flows.

  In this configuration, the excitation coil 216 is connected in series with adjacent excitation coil patterns via the back side excitation coil pattern. This also applies to the exciting coil 217.

  The above is the structure of the rotor unit 201. According to this structure, when the shaft 101 rotates, the rotor transformer coils 215a and 215b (see FIG. 2) formed on the insulating sheet 213, and the exciting coils 216 and 217 formed on the insulating sheet 214 (see FIGS. 3 and 4). ) Rotate together with the rotor unit 201 together with the shaft 101.

(Structure of stator part)
Next, the stator unit 202 of FIG. 2 will be described. The stator unit 202 includes a stator yoke 231. The stator yoke 231 is made of a nonmagnetic material and has a disk shape with a hole formed in the center. The stator yoke 231 is fixed to an end cap 108 (see FIG. 1) integrated with the motor housing 104.

  A stator core divided in two is fixed to the surface of the stator yoke 231 facing the rotor portion 201. In this example, the first stator core 232 a and the second stator core 232 b are fixed to the surface of the stator yoke 231 facing the rotor portion 201. Each of the stator cores 232a and 232b has a flat annular shape (a donut disk shape) having an opening in the center, and the stator core 232b is disposed outside the stator core 232a with a gap 306 therebetween.

  The stator core 232a functions as a core for increasing the efficiency of stator transformer coils 235a and 235b described later, and the stator core 232b functions as a core for increasing the efficiency of a resolver stator coil (detection coil) 236 described later.

  An insulating sheet 233 is fixed to the stator core 232a. The insulating sheet 233 is a resinous sheet formed into a thin annular shape (donut shape). The stator transformer coil 235a is embedded in one surface (upper surface in FIG. 2) of the insulating sheet 233, and the wiring layer 235b is embedded in the other surface (lower surface in FIG. 2). The stator transformer coil 235a has a plurality of spiral coil patterns (see FIG. 5). The stator transformer coil 235a and the wiring layer 235b are configured by printed wiring. The lead wire from the stator transformer coil 235a is connected to a drive circuit (not shown) that outputs an excitation current. A component having a stator transformer coil portion including the stator transformer coil 235a and its wiring layer and a rotor transformer coil portion including the rotor transformer coils 215a and 215b is referred to as a transformer coil portion.

  The stator transformer coil 235a and the rotor transformer coils 215a and 215b are magnetically coupled. When an exciting current is passed through the stator transformer coil 235a, an induced current is induced in the rotor transformer coils 215a and 215b, which is supplied to the exciting coils 216 and 217 as an exciting current. Since this action occurs regardless of the rotation of the rotor unit 201, excitation power is supplied to the rotating rotor unit 201.

  An insulating sheet 234 made of the same material as the insulating sheet 233 is fixed to the rotor portion 201 side of the stator core 232b. A detection coil 236 that is a resolver stator coil is embedded in one surface (upper surface in FIG. 2) of the insulating sheet 234, and a wiring layer 237 serving as a connection wiring for the detection coil 236 is disposed on the other surface (lower surface in FIG. 2). Buried. The detection coil 236 and the wiring layer 237 are configured by printed wiring and have the pattern shown in FIG.

  A bent portion 307 is provided on the inner peripheral portion of the stator core 232a, and a bent portion 308 is provided on the outer peripheral portion. The bent portion 307 extends toward the bent portion 302 of the rotor core 212a, and the bent portion 308 extends toward the bent portion 303 of the rotor core 212a. According to this structure, a magnetic path is easily formed between the bent portions 307 and 302 and between the bent portions 308 and 303. That is, since the magnetic resistance in the path becomes low, a path of magnetic flux passing through the bent portion is easily generated.

  Further, a bent portion 309 is provided on the inner peripheral portion of the stator core 232b, and a bent portion 310 is provided on the outer peripheral portion. The bent portion 309 extends toward the bent portion 304 of the rotor core 212b, and the bent portion 310 extends toward the bent portion 305 of the rotor core 212b. According to this structure, a magnetic path is easily formed between the bent portions 309 and 304 and between the bent portions 310 and 305.

  Hereinafter, the detection coil 236 will be described. As shown in FIG. 5, the detection coil 236 includes 16 spiral detection coil patterns 236a to 236p. The detection coil patterns 236a to 236p are arranged at an angular position of 22.5 ° in mechanical angle. In these coil patterns, the detection coil patterns 236a, 236c, 236e, 236g, 236i, 236k, 236m, and 236o constitute a sin phase detection coil group. The detection coil patterns 236b, 236d, 236f, 236h, 236j, 236l, 236n, and 236p constitute a cos phase detection coil group.

  The sin phase detection coil patterns 236a, 236c, 236e, 236g, 236i, 236k, 236m, and 236o are connected in series in the circumferential direction so that every other coil has an opposite phase. In order to realize this series connection, a wiring pattern of a jumper wire included in the wiring layer 237 on the back surface side (a wiring pattern of reference numeral 237a is shown as one of them) is used. This connection structure is the same in the cos phase.

  A stator transformer coil 235a having a spiral shape is arranged inside the detection coil group. Reference numeral 311 is a lead wire. The lead wire 311 includes two sin-phase and cos-phase output wires (four in total) and two wires to the stator transformer coil 235a. In addition, the component which has the detection coil 236 which is a resolver stator coil, and the excitation coils 216 and 217 which are resolver rotor coils is called a resolver coil part.

(Operation)
In operation, an exciting current is supplied to the stator transformer coil 235a shown in FIGS. This exciting current is induced in the rotor transformer coils 215a and 215b by an electromagnetic induction phenomenon, and is supplied to the exciting coils 216 and 217. When the excitation current flows, the excitation coils 216 and 217 generate an alternating magnetic flux, which is detected by the detection coil 236 based on the principle of electromagnetic induction.

  The alternating magnetic flux generated from the excitation coils 216 and 217 is induced by 90 ° in the two-phase coil groups (sin phase coil group and cos phase coil group) divided into two groups of the detection coil 236. Generate voltage. Hereinafter, this phenomenon will be specifically described. For example, when an excitation signal of Vext = Esin ωt is supplied to the rotor transformer coils 215a and 215b, the output expressed by Equation 1 is output to the sin phase output coil group of the detection coil 236 according to the rotation angle θ of the shaft 101 from the reference position. Appears, and the output shown in Equation 2 appears in the cos phase output coil group.

  Here, k is a proportional constant, E is the amplitude of the excitation signal, ω is the excitation frequency, α is the phase shift angle, and n is an arbitrary integer of 1 or more. Since Equations 1 and 2 have a relationship of Vsin / Vcos = tan θ, θ is calculated in an R / D converter (not shown) based on the values of Vsin and Vcos.

(Function)
FIG. 6 is a conceptual diagram showing the state of the magnetic path in each of the conventional structure (a) in which the transformer coil part and the resolver coil part share the core and the structure (b) of the present embodiment. In FIG. 6, the solid arrow indicates the magnetic flux generated in the transformer coil portion region 601, and the broken line indicates the magnetic flux generated in the resolver coil portion region 602.

  In the structure sharing the core of (a), since the cores 603 and 604 are common in the transformer coil part region 601 and the resolver coil part region 602, two kinds of magnetic fluxes are mixed and interfere with each other. On the other hand, in the structure of (b), since the core is separated in the transformer coil part region 601 and the resolver coil part region 602, a closed magnetic path is formed in each coil part region, and the transformer coil part region 601 Interference between the magnetic flux and the magnetic flux in the resolver coil portion region 602 is suppressed.

(Confirmation of effect)
FIG. 7A shows simulation values of the sin phase output and the cos phase output induced in one detection coil in the sheet coil resolver having the structure of FIG. 6A, and FIG. 6 shows simulation values of a sin phase output and a cos phase output induced in one detection coil of the sheet coil resolver having the structure of FIG. 6B. Here, the simulation is performed under the condition that the angle of the rotor with respect to the stator is the same. FIG. 7 shows two types of output changes of each phase, and this shows data in the detection coils of adjacent sin phases (cos phases).

  In the data shown in FIG. 7A, the difference between the outputs of sin1 and sin2 (and cos1 and cos2) is large, and the positive / negative symmetry of the output waveforms of sin1 and cos1 (and sin2 and cos2) is also bad (positive / negative output). The difference is great). This can be understood as a result of the interference of magnetic flux between the transformer coil part region 601 and the resolver coil part region 602 as shown in FIG.

  On the other hand, in the data shown in FIG. 7B, the difference between the outputs of sin1 and sin2 (and cos1 and cos2) is small, and the positive / negative symmetry of the output waveforms of sin1 and cos1 (and sin2 and cos2) is also small. Good (small positive / negative output difference). It can be understood that this is because the interference of magnetic flux between the transformer coil part region 601 and the resolver coil part region 602 is suppressed as shown in FIG.

(2) Second Embodiment In the first embodiment, the resolver coil portion of the sheet coil type resolver is a resolver rotor coil portion composed of a single-phase sheet coil as an excitation phase, and two detection phases (sin phase and The cos phase) is a resolver stator coil portion composed of a sheet coil.

  However, the application of the present invention is not limited to this structure, and the excitation phase is a resolver stator coil portion made up of two-phase (sin phase and cos phase) sheet coils, and the detection phase is made from a one-phase sheet coil. It can also be set as the resolver coil part of the wiring structure of the 2 phase input-1 phase output used as the resolver rotor coil part which becomes.

  In this case, a two-phase alternating magnetic flux showing a periodic change having a phase difference of 90 ° in electrical angle from the stator side is simultaneously generated, and a combined magnetic field of the two-phase alternating magnetic flux is detected on the rotor side. When the rotor rotates, the detected waveform of the magnetic field detected on the rotor side is modulated according to the rotation angle, and angle information is calculated in the R / D converter based on the state of this modulation.

(3) Third Embodiment In the sheet coil type resolver according to the first embodiment, the shaft multiple angle is 4X. However, the shaft multiple angle is not limited to this, and a resolver with an arbitrary shaft multiple angle can be realized. is there. In this case, the basic structure in which two phase coil patterns having a phase difference of 90 ° in electrical angle with each other in the resolver stator coil portion are arranged on the circumference and connected in series is the same. is there. The adjacent coil patterns are mechanical angles of (90 / (m × n)) ° (n is the number of shaft angle multipliers, and m is the angle multiplier relative to the resolver shaft angle multiplier nX (n is an arbitrary integer equal to or greater than 1). The coil pattern may be arranged on the circumference so as to be an interval of an arbitrary integer of 1 or more.

(4) Other embodiment 1
FIG. 8 shows another variation structure using the invention. In FIG. 8, the same parts as those in FIG. 2 are the same as those described in relation to FIG. FIG. 8A shows a sheet coil type resolver 800. The sheet coil resolver 800 includes a rotor yoke 820 and a stator yoke 821 made of a nonmagnetic material. Rotor cores 801a and 801b are fixed to the rotor yoke 820. The rotor core 801a is a core of a rotor transformer coil part, and the rotor core 801b is a core of an excitation coil on the rotor side.

  In this example, a gap 803 is provided between the rotor cores 801a and 801b. Further, the width of the gap 803 (the distance between the rotor cores 801a and 801b) is larger than that in the configuration of FIG. Then, instead of increasing the separation distance due to the gap 803, the rotor cores 801a and 801b are not provided with bent portions in the gap 803 portion. Further, the bent portion in the outer peripheral portion of the rotor core 801b is also omitted. The same applies to the stator cores 802a and 802b. Reference numeral 804 denotes a gap provided between the stator cores 802a and 802b. According to this configuration, since the shape of the core can be simplified, the manufacturing cost can be suppressed.

  8B, in the sheet coil resolver 800 shown in FIG. 8A, a spacer 805 made of a nonmagnetic material is arranged in the gap 803, and a spacer 806 made of a nonmagnetic material in the gap 804. A configuration in which is arranged is shown. According to this configuration, since the spacers 805 and 806 function as core positioning members, the assembly accuracy is improved and the assembly is facilitated.

  In the configuration shown in FIG. 8B, a magnetic shield member made of a magnetic material may be disposed inside the spacers 805 and 806, and the spacers 805 and 806 may have a magnetic shield function. In this case, the magnetic shield function is obtained by separating the magnetic shield member so as not to contact the adjacent core and magnetically insulating the periphery with a nonmagnetic material. By doing so, the magnetic separation of the core can be further enhanced.

  FIG. 8C shows a configuration in which the protrusion 807a of the rotor yoke 807 made of a nonmagnetic material is positioned in the gap 803 shown in FIG. 8A, and further, in the gap 804 shown in FIG. 8A. A configuration in which the protrusion 808a of the stator yoke 808 is positioned is shown. According to this configuration, it is possible to obtain a sheet coil resolver that can reduce the number of parts and that has excellent assembly accuracy and easy assembly.

(5) Other embodiment 2
9A employs the rotor core 212a of FIG. 2 instead of the rotor core 801a in the configuration shown in FIG. 8A, and instead of the stator core 802a in the configuration shown in FIG. 8A, FIG. A stator core 232a is employed. According to this configuration, in addition to the effect of providing the gaps 803 and 804, the effect of preventing unnecessary leakage of magnetic flux due to the provision of the bent portions 303 and 308 can be obtained.

  FIG. 9B shows a structure in which the stator core 232a is replaced with a stator core 802a (see FIG. 8) in which the bent portion 308 is not provided in the configuration shown in FIG. 9A.

  2C, the rotor core 801a in FIG. 8A is adopted as the rotor core on the rotor transformer coil portion side in the configuration shown in FIG. 2, and the stator core in FIG. 8A is used as the stator core on the stator transformer coil portion side. A structure employing 802a is shown.

  10A, in the configuration shown in FIG. 9A, a spacer 851 made of a nonmagnetic material is disposed in the gap 803 between the cores, and the gap 804 between the cores is made of a nonmagnetic material. A configuration in which spacers 852 are arranged is shown.

  In FIG. 10 (b), in the configuration shown in FIG. 9 (a), a rotor yoke 853 having a projection 853a that fills the gap 803 is adopted as the rotor yoke, and the stator yoke is made of a nonmagnetic material. In addition, a configuration in which a stator yoke 854 having a protrusion 854a that fills the gap 804 is employed is described. According to this configuration, since the core can be positioned with high accuracy with a small number of parts, high productivity can be obtained.

  FIG. 11 shows an example of the shape of the rotor core and / or the stator core. FIG. 11 shows a core 860 that can be used as a rotor core and / or a stator core. The core 860 has a disk shape made of a magnetic material (for example, a silicon steel plate) on a thin plate.

  In this example, the core 860 has a structure in which a transformer coil core portion 861 and a resolver coil core portion 862 are coupled and integrated by a coupling portion 863. This structure is manufactured by forming four arc-shaped slits 864 in a disk-shaped magnetic material so that the coupling between the transformer coil core portion 861 and the resolver coil core portion 862 becomes partial. In this structure, since the coupling portion is partial, one plate of magnetic material having a disk shape is magnetically separated into the inner transformer coil core portion 861 and the outer resolver coil core portion 862. It becomes a structure.

  In the configuration shown in FIG. 11, the portion of the slit 864 may be changed to a groove. In this case, since the connecting portion remains at the bottom of the groove, the groove can be formed on the entire circumference. In either case, the partial coupling structure makes the coupling between the transformer coil core portion 861 and the resolver coil core portion 862 partial, and narrows the magnetic path connecting the two, thereby magnetically acting as the core. It is separated.

  In the configuration shown in FIG. 2, the rotor cores 212a and 212b may be integrated with each other without being separated, and the stator core may be separated into the stator cores 232a and 232b. In this case, on the rotor side, the core is shared by the rotor transformer coil portion and the resolver rotor coil portion, but on the stator side, the core is separated by the stator transformer coil portion and the resolver stator coil portion. For this reason, the magnetic path of the magnetic flux circulating through the transformer coil part region 601 and the resolver coil part region 602 shown in FIG. 6A is blocked on the stator side, and the magnetic flux in the transformer coil part region 601 and the resolver coil part region 602 Interference can be suppressed. This effect can be similarly obtained when the rotor cores 212a and 212b are separated and the stator core is not separated into the stator cores 232a and 232b but is formed as an integral structure.

  As mentioned above, although this invention was demonstrated by preferable embodiment, this invention is not limited to embodiment mentioned above, A various deformation | transformation and application are possible within the range of the technical idea of this invention.

  For example, the spiral shape of the coil pattern of the resolver rotor coil portion and the resolver stator coil portion is not limited to the illustrated shape, and various deformation shapes can be applied.

  The present invention can be used for a sheet coil type resolver.

  DESCRIPTION OF SYMBOLS 100 ... Motor, 101 ... Shaft, 102, 103 ... Bearing, 104 ... Motor housing, 105 ... Motor rotor, 106 ... Motor stator core, 107 ... Motor winding, 108 ... End cap, 200 ... Sheet coil type resolver, 201 ... Rotor part , 202 ... Stator section, 211 ... Rotor yoke, 212a and 212b ... Rotor core, 213 and 214 ... Insulation sheet, 215a and 215b ... Rotor transformer coil, 216 and 217 ... Resolver rotor coils (excitation coils), 216a to 216h, 217a to 217h ... excitation coil pattern, 218, 219 ... lead wire, 220 ... through hole, 231 ... stator yoke, 232a, 232b ... stator core, 233,234 ... insulation sheet, 235a ... stator transformer coil, 235b ... arrangement Layer, 236 ... resolver stator coil (detection coil), 236a to 236p ... detection coil pattern, 237 ... wiring layer, 237a ... wiring pattern, 301 ... gap, 302-305 ... bent portion, 306 ... gap, 307-310 ... bent , 311 ... lead wire, 601 ... transformer coil part region, 602 ... resolver coil part region, 800 ... sheet coil type resolver, 801a, 801b ... rotor core, 802a, 802b ... stator core, 803, 804 ... gap, 805, 806 ... spacer, 807 ... rotor yoke, 807a ... projection, 808 ... stator yoke, 808a ... projection, 820 ... rotor yoke, 821 ... stator yoke, 851, 852 ... spacer, 853 ... rotor yoke, 853a ... projection, 854 ... stator yoke, 854a ... Protrusion, 860 ... A, 861 ... transformer coil core section, 862 ... resolver coil core section, 863 ... coupling portion, 864 ... slit.

Claims (8)

A resolver coil part having a sheet-like resolver stator coil part arranged in the stator part and a sheet-like resolver rotor coil part arranged in a rotor part rotatable relative to the stator part;
A transformer coil part having a sheet-like stator transformer coil part arranged concentrically with the resolver stator coil part and a sheet-like rotor transformer coil part arranged concentrically with the resolver rotor coil part;
A first core disposed along the sheet surface of the resolver coil portion and serving as a core of the resolver coil portion;
A second core disposed along the sheet surface of the transformer coil portion and serving as a core of the transformer coil portion;
The sheet coil type resolver, wherein the first core and the second core are magnetically separated.   The sheet coil type resolver according to claim 1, wherein the first core and the second core are formed separately from each other.   The sheet coil resolver according to claim 1, wherein the first core and the second core are partially coupled to each other.   The sheet coil type according to any one of claims 1 to 3, wherein the separation is performed by a gap formed between the first core and the second core. Resolver.   The sheet coil resolver according to any one of claims 1 to 3, wherein the separation is performed by a spacer disposed between the first core and the second core.   6. The sheet coil resolver according to claim 5, wherein the spacer includes a magnetic shield member, and the magnetic shield member is separated from the first core and the second core.   6. The sheet coil resolver according to claim 5, wherein the spacer is a part of a yoke that covers the outside of each core.   5. The sheet coil resolver according to claim 4, wherein at least one of the bent portion of the first core and the bent portion of the second core is disposed in the gap.

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