JP2013225983A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve detection accuracy by reducing noises caused by influences of external factors upon a detection section in a resolver.SOLUTION: A detection coil 40s of a resolver includes a plurality of sheet coils 42-48 which are provided in parallel with each other at intervals in a circumferential direction and a connecting lead wire part 50 which is disposed to connect in series and circulate the sheet coils and whose both ends are connected to output terminals 62s, 64s. When a total area of the sheet coils 44, 48 wound in the same direction as the connecting lead wire part 50 among the sheet coils 42-48 is defined as A, a total area of the sheet coils 42, 46 wound in a direction opposite to the connecting lead wire part 50 is defined as B and a total area of the connecting lead wire part 50 is defined as C, an inequality A<B≤A+C is satisfied.

Description

  The present invention relates to a resolver used for detecting a rotation angle of a rotating object such as a rotor of an automobile motor.

  Conventionally, high-power brushless motors are used in hybrid vehicles and electric vehicles, and higher power is expected in the future. In order to control a brushless motor of a hybrid vehicle, it is necessary to accurately grasp the rotation angle of the output shaft of the motor. This is because it is necessary to accurately grasp the rotational position of the rotor in order to control energization switching to each coil of the stator.

  For this reason, it is desirable that the motor is provided with a resolver to accurately detect the angle. A resolver used in a drive mechanism of an automobile is required to have high accuracy because the rotational speed of the drive mechanism is high in addition to environmental resistance. As with other in-vehicle components, the resolver is required to be downsized and cost-effective.

  For example, in Japanese Unexamined Patent Application Publication No. 2010-237077 (hereinafter referred to as Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2011-2388 (hereinafter referred to as Patent Document 2), a SIN phase detection coil and A two-phase output type resolver in which COS phase detection coils are alternately arranged in the circumferential direction is described. As described above, by providing the SIN phase detection coil and the COS phase detection coil on the front and back surfaces of the insulating layer, even when the gap between the excitation coil and the detection coil varies, the SIN phase detection coil and the excitation coil are not affected. It is described that since the gap and the gap between the COS phase detection coil and the excitation coil can be made the same, no error occurs between the detection signals from the two-phase detection coil, and the detection accuracy is improved.

  For these resolvers described in Patent Documents 1 and 2, for example, a SIN phase detection coil is disposed on the surface of the insulating layer, and the back surface of the insulating layer is 90 degrees out of phase with the SIN phase detection coil. Conventionally, a sheet coil type resolver in which a COS phase detection coil is disposed at a specific position is known. In such a sheet coil type resolver, there is one in which the detection coil is configured as shown in FIG.

  The detection coil shown in FIG. 4 shows, for example, a SIN phase detection coil 40s included in a sheet coil resolver having an axial multiplication angle nX (n is a natural number) of 2X in a plan view. The SIN phase detection coil 40s is configured by four substantially fan-shaped sheet-like coils 42-48 arranged at intervals in the circumferential direction.

  Each of these four sheet-like coils 42-48 is wound with coil conductors arranged in a spiral shape in a plane, and the two sheet-like coils 42, 46 are opposed to each other in the radial direction, and the remaining 2 The two sheet-like coils 44 and 48 are also opposed in the radial direction at positions shifted by 90 degrees.

  However, in these four sheet-like coils 42-48, the winding directions are opposite between two sheet-like coils adjacent in the circumferential direction. Specifically, in the sheet-like coils 42 and 46, coil conductors are spirally wound in the right-handed direction (that is, clockwise direction) from the outer side to the inner side of the substantially fan-shaped outer shape, while the sheet-like coil 44 is wound. , 48, coil conductors are spirally wound in the left-handed direction (ie, counterclockwise direction) from the outside to the inside of the substantially fan-shaped outer shape. That the winding direction is opposite is schematically shown by solid line arrows and dotted line arrows drawn in the respective sheet coils 42-48.

  The four sheet-like coils 42-48 are connected in series by a connecting wire 50 extending in the circumferential direction on the outer diameter side. The connecting wire 50 is constituted by connecting wire sections 52-60 divided in the circumferential direction. One end of the crossover conductor section 52 is connected to the output terminal 62, and the other end of the crossover conductor section 52 is connected to one end of the sheet coil 42. One end of the connecting wire section 54 is connected to the other end of the sheet coil 42, and the other end of the connecting wire section 54 is connected to one end of the sheet coil 44 adjacent to the sheet coil 42 in the circumferential direction. Is done. Thereby, the sheet coil 42 and the sheet coil 44 are connected in series.

  Note that the other end of the sheet-like coil 42 can be drawn radially outward through the inside of the insulating layer in which the detection coil 40 is disposed, and this also applies to the other sheet-like coils 44-48. It is.

  Hereinafter, similarly, the sheet-like coils 44 and 46 adjacent in the circumferential direction are connected in series by the connecting wire section 56, and the sheet-like coils 46 and 48 adjacent in the circumferential direction are connected in series by the connecting conductor section 58. Then, one end portion is connected to the other end portion of the sheet-like coil 48, and the other end of the conducting wire section 60 is connected to the output terminal 64.

JP 2010-237077 A JP 2011-2388 A

  In the resolver including the detection coil 40 as described above, even if noise is generated in the detection signal due to the influence of leakage magnetic flux from a motor or the like provided adjacent to the resolver other than the excitation coil of the resolver, it is adjacent in the circumferential direction. Since the matching sheet-like coils are wound in opposite directions and have the same size, the direction of the electromotive force generated by the leakage magnetic flux is canceled out in the opposite direction, resulting in enhanced resistance to external noise. There are advantages that can be done. In FIG. 4, arrows 66-69 schematically show how noise is canceled between adjacent sheet coils in the circumferential direction.

  However, in the detection coil 40 shown in FIG. 4, the connecting wire 50 that connects the sheet-like coils 42 to 48 is formed by extending in the circumferential direction on the outer diameter side. Noise can be picked up. In that case, even if the influence of external noise is canceled between the sheet-like coils 42-48, the detection signals output from the output terminals 62 and 64 contain noise, and accordingly, the detection accuracy of the resolver. Will drop.

  The objective of this invention is providing the resolver which can reduce the influence of the external noise with respect to the detection coil arrange | positioned on the same plane, and can improve a detection precision.

  A resolver according to the present invention is a resolver for detecting a rotation angle of a rotor of a rotating electrical machine, and includes an excitation coil fixed to the rotor, and a detection unit disposed to face the excitation coil via a gap, The detection unit is arranged so that a plurality of coils provided in parallel to each other in the circumferential direction of the rotation axis of the rotor and the coils are connected in series and circulate around the rotation axis of the rotor. A total area of the coil wound in the same direction as the crossover conductor portion of the coil, and A is wound in a direction opposite to the crossover conductor portion of the coil. The inequality A <B ≦ A + C is satisfied, where B is the total area of the coil and C is the total area of the crossover conductor.

  In the resolver according to the present invention, the area of the region surrounded by the outline of the one coil is formed smaller than the area of the region surrounded by the outline of the other coil, so that the inequality is satisfied. It may be set to be

  In the resolver according to the present invention, the one coil may be set so as to satisfy the inequality by being wound with a coarser density than the other coil.

  Moreover, the resolver which concerns on this invention WHEREIN: The said crossing conductor part may be arrange | positioned with respect to each coil at the internal diameter side, and may connect between each coil.

  Furthermore, in the resolver according to the present invention, it is preferable that the equation B = A + C is satisfied.

  According to the resolver of the present invention, the total area B of the other coil is larger than the total area A of the one coil, and the total area A of the one coil that is in the same winding direction and the total of the crossover conductors. It was made into the value below which added the area C. Thereby, in a resolver including a detection coil configured by winding two coils adjacent in the circumferential direction in opposite directions, compared to the case where the total area of the two coils having different winding directions is the same, It is possible to reduce the influence of external noise due to the connecting wire portion on the detection signal of the detection coil. Therefore, it is possible to further enhance the resistance of the resolver to external noise, and the rotation angle detection accuracy is improved.

It is a fragmentary sectional view of the axial direction which shows the structure of the motor provided with the resolver which is one embodiment of this invention. It is a disassembled perspective view of the resolver stator contained in the resolver of this Embodiment. It is a top view of the SIN phase detection coil contained in a resolver stator. It is a top view corresponding to FIG. 3 which shows the comparative example of the detection coil contained in a resolver stator.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  FIG. 1 is a partial cross-sectional view in the axial direction showing the structure of a motor 10 provided with a resolver 30 of this embodiment. In FIG. 1, the motor 10 and the resolver 30 are shown in a half in the radial direction that is symmetric with respect to the rotation center axis X.

  The motor 10 includes a case main body 12, a case cover 14, a motor stator 16, a motor rotor 18, a rotor shaft 20, and bearing members 22a and 22b.

  The case main body 12 and the case cover 14 are made by casting an aluminum alloy or the like. A bearing member 22 a is fitted and fixed to the case main body 12, and a bearing member 22 b is fitted and fixed to the case cover 14. The rotor shaft 20 is rotatably supported by these bearing members 22a and 22b.

  A motor stator 16 is fixed to the inner periphery of the case body 12. The motor stator 16 is, for example, a magnetic body configured by laminating a plurality of electromagnetic steel plates each having a substantially annular shape in the axial direction and integrally connected. The motor stator 16 has a substantially cylindrical shape, and a plurality of teeth portions 17 that are arranged at equal intervals in the circumferential direction protrude from the inner peripheral side. A motor coil 24 is wound around the tooth portion 17. When the motor coil 24 is energized, a rotating magnetic field is generated on the inner peripheral side of the motor stator 16.

  On the other hand, a motor rotor 18 in which a permanent magnet is embedded is fixed to the rotor shaft 20. Similarly to the motor stator 16, the motor rotor 18 can also be constituted by, for example, a magnetic body integrally laminated by laminating a plurality of electromagnetic steel plates each having a substantially annular shape in the axial direction. The motor stator 16 and the motor rotor 18 are arranged to face each other with a predetermined distance. With this configuration, the motor rotor 18 is rotated by receiving a magnetic attractive force and a repulsive force due to the action of a rotating magnetic field generated by energizing the motor coil 24 of the motor stator 16, thereby generating a driving force. Power is output to the rotor shaft 20.

  The resolver 30 of this embodiment is a thin rotation angle detector, and includes a resolver stator 32 and a resolver rotor 34. The resolver stator 32 is fixed to the case cover 14. The resolver rotor 34 is fixed to the axial end surface of the motor rotor 18. In a state where the case main body 12 and the case cover 14 are assembled, the resolver rotor 34 and the resolver stator 32 are disposed so as to face each other with a predetermined distance therebetween. The closer the predetermined distance is, the better the detection accuracy of the resolver 30 is, but it is determined in consideration of dimensional tolerance, assembly error, dimensional change due to temperature, and the like.

  The resolver 30 of the present embodiment is a device for detecting the rotation angle of the motor rotor 18 from the rotation origin position, and a one-phase excitation two-phase output type sheet coil resolver is exemplified. The resolver stator 32 is provided with a stator side transformer coil, a SIN phase detection coil and a COS phase detection coil, which will be described later, and the resolver rotor 34 is provided with a rotor side transformer coil and an excitation coil 35. When an alternating current of a predetermined frequency is passed through the stator-side transformer coil of the resolver stator 32, an induced current is generated by the action of electromagnetic induction in the rotor-side transformer coil of the resolver rotor 34 disposed in the vicinity, and this induced current is excited coil The magnetic flux is generated by being excited by flowing to 35.

  The magnetic flux generated from the exciting coil 35 of the resolver rotor 34 is linked to the adjacent SIN phase detection coil and COS phase detection coil of the resolver rotor 34 to generate an induced current, and the detection coils are 90 degrees out of phase with each other. A SIN phase detection signal and a COS phase detection signal, which are alternating voltages, are output. These detection signals are converted into pulse signals by analog-digital conversion by a known RD (Resolver-Digital) converter, and the rotation angle from the rotation origin position of the motor rotor 18 is detected by counting the pulses. it can. The stator side and rotor side transformer coils, the excitation coil 35, the RD converter, and the like of the resolver 30 may have a known configuration.

  Next, the configuration of the resolver stator 32 will be described with reference to FIG. FIG. 2 is an exploded perspective view showing the resolver stator 32. In the following description, the same or similar reference numerals are used for the same or similar components as those of the detection coil 40 of the comparative example described above with reference to FIG.

  The resolver stator 32 includes a resolver body 36 shown in FIG. 2E, a SIN detection coil (detector) 40s shown in FIG. 2D, and an insulating layer shown in FIG. 38, a COS phase detection coil (detection unit) 40c shown in FIG. 2B and a protective layer 72 shown in FIG.

  The resolver body 36 is a base made of, for example, PPS resin and having high flatness, is formed in a disk shape having a circular hole 361 at the center, and includes a terminal portion 362 that protrudes from the outer peripheral portion into a substantially rectangular shape.

  Six terminals 364 protrude from the terminal portion 362. Two of these six terminals 364 pass through the inside of the resolver body 36 and are connected to connection portions 371 and 372 formed in the vicinity of the inner peripheral edge portion. In the present embodiment, the stator side transformer coil 41 is annularly wound around the inner circumference side of the transformer coil layer 41s and the COS phase detection coil 40c wound around the inner circumference side of the SIN phase detection coil 40s. The transformer coil layer 41 c is configured to be connected in series via the through holes 391 and 392 of the insulating layer 38, and both ends of the stator side transformer coil 41 are connected to the connection portions 371 and 372.

  In the above description, a part of the stator-side transformer coil 41 is provided in each of the SIN phase detection coil 40s and the COS phase detection coil 40c. However, the present invention is not limited to this. In this case, it is preferable to provide the stator side transformer coil on the SIN phase detection coil side closer to the resolver rotor 34 in order to increase the electromagnetic induction effect.

  The other two of the six terminals 364 are terminals for outputting a detection signal from the SIN phase detection coil 40s to the RD converter, and are exposed on the terminal portion 362 through the inside of the resolver body 36. The connection parts 373 and 374 are connected, and these connection parts 373 and 374 are connected to the output terminals 62s and 64s of the SIN phase detection coil 40s.

  Of the six terminals 364, the remaining two terminals are terminals for outputting a detection signal from the COS phase detection coil 40c to the RD converter, and pass through the interior of the resolver body 36 to the terminal portion 362. The connection portions 375 and 376 are exposed to the above, and these connection portions 375 and 376 are connected to the output terminals 62 c and 64 c of the COS phase detection coil 40 c through the through holes 393 and 394 formed in the insulating layer 38. Connected.

  The insulating layer 38 is preferably composed of an insulating resin sheet and is formed in a disk shape having a circular hole 381 at the center. The insulating layer 38 has a function of electrically insulating the SIN phase detection coil 40s disposed on the front surface (lower surface in FIG. 2) and the COS phase detection coil 40c disposed on the back surface (upper surface in FIG. 2). . As described above, the through holes 391 to 394 are formed in the insulating layer 38.

  Further, the protective layer 72 is a protective film made of, for example, an insulating resin, and has a function of covering and protecting the COS phase detection coil 40 c disposed on the back surface of the insulating layer 38. The protective layer 72 is formed in a shape corresponding to the resolver body 36, and also has a function of covering the terminal portion 362 and protecting the electrical connection portion in each connection portion 373-376.

  Next, the structure of the SIN phase detection coil 40s will be described with reference to FIG. FIG. 3 is a plan view of the SIN phase detection coil 40 s included in the resolver stator 32. Here, the COS phase detection coil 40 c formed on the back surface of the insulating layer 38 has the same structure as that of the SIN phase detection coil 40 s disposed on the surface of the insulating layer 38 except that it is 90 degrees out of phase. Only the SIN phase detection coil 40s will be described.

  As shown in FIG. 3, the SIN phase detection coil 40 s is configured such that four substantially fan-like sheet coils 42-48 are provided in parallel to each other at intervals in the circumferential direction of the rotation axis of the resolver rotor 34. . Moreover, each sheet-like coil 42-48 is arrange | positioned on the same plane. Each of these four sheet-like coils 42-48 is wound with coil conductors arranged in a spiral shape in a plane, and the two sheet-like coils 42, 46 are opposed to each other in the radial direction, and the remaining 2 The two sheet-like coils 44 and 48 are also opposed in the radial direction at positions shifted by 90 degrees.

  However, in these four sheet-like coils 42-48, the winding directions are opposite between two sheet-like coils adjacent in the circumferential direction. Specifically, in the sheet-like coils 42 and 46, coil conductors are spirally wound in the right-handed direction (that is, clockwise direction) from the outer side to the inner side of the substantially fan-shaped outer shape, while the sheet-like coil 44 is wound. , 48, coil conductors are spirally wound in the left-handed direction (ie, counterclockwise direction) from the outside to the inside of the substantially fan-shaped outer shape. That the winding direction is opposite is schematically shown by solid line arrows and dotted line arrows drawn in the respective sheet coils 42-48.

  The four sheet-like coils 42-48 are connected in series by a connecting wire 50 extending in the circumferential direction on the outer diameter side. The connecting wire 50 is constituted by connecting wire sections 52-60 divided in the circumferential direction. One end of the connecting wire section 52 is connected to the output terminal 62 s, and the other end of the connecting wire section 52 is connected to one end of the sheet coil 42. One end of the connecting wire section 54 is connected to the other end of the sheet coil 42, and the other end of the connecting wire section 54 is connected to one end of the sheet coil 44 adjacent to the sheet coil 42 in the circumferential direction. Is done. Thereby, the sheet coil 42 and the sheet coil 44 are connected in series.

  Note that the other end of the sheet-like coil 42 can be drawn radially outward through the inside or the back surface of the insulating layer 38 where the detection coil 40 is disposed, which means that other sheet-like coils 44-48. The same applies to.

  Hereinafter, similarly, the sheet-like coils 44 and 46 adjacent in the circumferential direction are connected in series by the connecting wire section 56, and the sheet-like coils 46 and 48 adjacent in the circumferential direction are connected in series by the connecting conductor section 58. And one end part is connected to the other end part of the sheet-like coil 48, and the other end of the conducting wire section 60 is connected to the output terminal 64s.

  In this way, the connecting wire 50 connecting the sheet-like coils 42-48 in series between the two output terminals 62s and 64s is such that the current flows in the clockwise direction (clockwise direction) when the sine wave detection signal is a positive voltage. ), That is, the output terminal 62 s is a negative terminal and the output terminal 64 s is a positive terminal. Therefore, when the current is flown in the counterclockwise direction (counterclockwise direction) when the detection signal is a positive voltage in the connecting wire 50, the total area of the sheet coils 42, 46 is the total area of the sheet coils 44, 48. What is necessary is just to make it smaller than a total area.

  In the present embodiment, of the two sheet-like coils 42 to 48 adjacent to each other in the circumferential direction, one of the sheet-like coils 44 and 48 is spirally wound in the same direction as the connecting wire 50 in plan view, and the other sheet The coil coils 42 and 46 are wound in a spiral shape in a direction opposite to the crossover wire 50 in a plan view in the same direction. When the total area of one sheet-like coil 44, 48 is A, the total area of the other sheet-like coil 42, 46 is B, and the total area of the connecting wire 50 is C, the inequality 1: A <B ≦ A + C is satisfied. Here, when there are a plurality of coils, the area of the coil can be a value obtained by adding the area of the shape surrounded by one turn of the coil by the number of turns.

  More specifically, assuming that the areas of the sheet-like coils 44 and 48 are a1 and a2, the areas of the sheet-like coils 42 and 46 are b1 and b2, and the area of each section 52-60 of the connecting wire 50 is c1-c5. The total area A = a1 + a2, the total area B = b1 + b2, and the total area C = c1 + c2 + c3 + c4 + c5. In the present embodiment, the two sheet-like coils 42 and 46 and 44 and 48 in the same winding direction facing in the radial direction have the same size, so that the total area A = 2 × a1, The total area B = 2 × a2.

  Here, since the inequality 2: A <B is satisfied, in the present embodiment, when the outer contours of two sheet-like coils adjacent to each other in the circumferential direction, for example, the sheet-like coils 44 and 46 are viewed, Although the angular ranges of 44 and 46 extending in the circumferential direction are the same, the radial width d1 of the sheet-like coil 44 is made smaller than the radial width d2 of the sheet-like coil 46. Thereby, the area a1 of the sheet coil 44 when the winding density of the coil conductors constituting each of the sheet coils 44 and 46 (that is, the interval between the coil conductors wound in a spiral shape) is the same is the area of the sheet coil 46. It is smaller than b2 (= b1).

  In this case, the value (A + C) obtained by adding the total area C of the crossover conductor 50 to the total area A of the one sheet-like coil 44, 48 is equal to the total area B of the other sheet-like coil 42, 46. That is, it is most preferable to satisfy the equation B = A + C.

  By doing so, even when noise is generated in the SIN phase detection signal due to an external factor, for example, leakage magnetic flux from the motor stator 16, on the resolver stator 32, one of the sheet-like coils 44 and 48, In the other sheet-like coils 42 and 46 and the connecting wire 50 which are in the opposite winding direction, noises caused by external factors are canceled as electromotive forces in opposite directions. Therefore, resistance to noise caused by external factors of the resolver 30 can be further strengthened, and the detection accuracy of the rotation angle of the motor rotor 18 can be improved.

  However, although it has been described above that it is most preferable that the equation B = A + C, the total area A of one sheet-like coil 44, 46, the total area B of the other sheet-like coil 42, 44, or a crossover conductor The inequality 3: A <B ≦ A + C may be satisfied by adjusting at least one of the 50 total areas C. Even in this case, as compared with the case where all the sheet-like coils 42-48 are formed in the same size and the same area, the noise due to the influence of the external factor caused by the connecting wire 50 on the detection signal of the SIN phase detection coil 40s is reduced. can do. Therefore, it can be said that resistance to noise caused by an external factor of the resolver 30 can be enhanced, and the detection accuracy of the rotation angle is improved.

  If one sheet-like coil 44, 48 is formed smaller than the other sheet-like coil 42, 46 as described above, for example, the positive peak value of the output sinusoidal output signal is the negative peak value. Although it becomes smaller, such a shift of the detected waveform appears in the same manner for each rotation period of the resolver rotor 34 and can be adjusted by correction control.

  Although the resolver 30 according to the embodiment of the present invention has been described above, the resolver according to the present invention is not limited to the above-described configuration, and is within the scope of the matters described in the claims of the present application. Various changes can be made.

  In the above description, when the winding densities of the coil conductors of the sheet coils 42-48 are the same, the area of the region surrounded by the outline of the sheet coils 44, 48 is the other sheet coils 42, 46. Although the above-described inequality 1 is set so that the area of the region surrounded by the outer contour is formed smaller than that, the present invention is not limited to this. For example, the winding density of the coil conductors of one of the sheet-like coils 44 and 48 is coarser than that of the other sheet-like coils 42 and 46, while the area surrounded by the outer contour line is the same for all of the sheet-like coils 42-48. One sheet-like coil 44, 48, that is, the interval between the coil conductors is widened, the number of turns of the coil conductor of one sheet-like coil 44, 48 is less than the number of turns of the other sheet-like coil 42, 46. The thickness of the coil conductor may be made thinner than the other sheet-like coils 42 and 46, or the like. This also has the same effect. Further, such a change in at least one of the winding density, the number of turns, and the coil conductor thickness of the coil conductor may be used in combination with the difference in the outer contour.

  In the above description, the connecting wire 50 is disposed on the outer diameter side of each sheet-like coil 42-48. However, the present invention is not limited to this, and the connecting wire 50 is connected to each sheet-like coil 42-48 with an inner diameter. It may be arranged on the side. In this way, it is possible to shorten the length of the connecting wire 50 that connects the respective sheet-like coils 42-48 in series, and to make it difficult to pick up noise due to external factors.

  Furthermore, in the above description, a single-phase excitation two-phase output type resolver with a shaft double angle of 2X has been described as an example. May be applied.

  Furthermore, in the above-described embodiment, a resolver that is a thin rotation angle detector and the detection coil is configured by a sheet-like coil has been described, but the present invention is provided with a resolver stator and a resolver facing each other in the radial direction, The present invention may be applied to a resolver having a well-known configuration in which a plurality of coils are wound around the inner circumferential portion of the resolver stator in parallel with each other at intervals in the circumferential direction.

  DESCRIPTION OF SYMBOLS 10 Motor, 12 Case main body, 14 Case cover, 16 Motor stator, 17 Teeth part, 18 Motor rotor, 20 Rotor shaft, 22a, 22b Bearing member, 24 Motor coil, 30 Resolver, 32 Resolver stator, 34 Resolver rotor, 35 Excitation coil 36, resolver body, 38 insulating layer, 40 detection coil, 40s SIN phase detection coil, 40c COS phase detection coil, 41 stator side transformer coil, 41c, 41s transformer coil layer, 42, 44, 46, 48 sheet coil, 50 Crossover conductor, 52, 54, 56, 58, 60 Crossover section, 62, 62c, 62s, 64, 64c, 64s Output terminal, 66-69 arrow, 72 Protection layer, 361, 381 hole, 362 terminal part, 364 terminal 371-376 Connection portion, 391, 392, 393, 394 through hole, A, B, C total area, a1, a2, b1, b2, c1-c5 area, d1, d2 radial width, nX axis multiple angle, X rotation center axis.

Claims (1)

A resolver for detecting a rotation angle of a rotor of a rotating electrical machine,
An excitation coil fixed to the rotor, and a detector disposed opposite to the excitation coil via a gap,
The detection unit is arranged so as to circulate around the rotation axis of the rotor by connecting a plurality of coils provided in parallel to each other at intervals in the circumferential direction of the rotation axis of the rotor and connecting the coils in series. And a connecting wire portion whose both ends are connected to the output terminal,
The total area of the coils wound in the same direction as the connecting wire portion of the coil is A, the total area of the coils wound in the opposite direction of the connecting wire portion of the coil is B, and the connecting wire When the total area of the parts is C, the inequality A <B ≦ A + C is satisfied.
Resolver.

Images