JP2013027130A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a manufacturing operation and reduce costs while restraining deterioration of detection accuracy of a rotation angle in a resolver.SOLUTION: A resolver includes a stator 14 and a rotor. The stator 14 includes plural barrel parts 32 arranged in a peripheral direction and made of a magnetic material, a slot 24 between the barrel parts 32 adjacent to each other in the peripheral direction, and an excitation coil 26 and output coils 28, 30 wound around the plural barrel parts 32. A gap permeance between an outer detection face of the rotor and a tip of the barrel part 32 varies into a continuous wave shape including an arc to a rotation angle θ. The excitation coil 26 is wound across the two barrel parts 32 every 2 slot pitches. The output coils 28, 30 of each phase are distribution-wound across the two barrel parts 32 every 2 slot pitches, so that an induction voltage distribution generated in each phase of the output coils 28, 30 is a distribution in a continuous wave shape including an arc.

Description

  The present invention includes a stator including a plurality of teeth and slots provided between adjacent teeth, a plurality of excitation windings and a plurality of phase output windings, and a detection surface for detecting a rotation angle on an outer peripheral surface. And a resolver provided with a rotor arranged to be rotatable with respect to a stator.

  Conventionally, it has been considered that a resolver is used to detect the rotation angle of a rotating electrical machine that is mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle and used as an electric motor or a generator for driving wheels. ing. For example, as a resolver, a structure including a stator and a stator that is disposed to face the stator and is rotatable with respect to the stator and that outputs an output signal corresponding to the rotation angle of the rotor is conceivable.

  For example, in Patent Document 1, a stator having slots provided at a plurality of locations in the circumferential direction, an excitation winding and an n-phase output winding provided in the slot, and a rotation provided with respect to the stator are provided. A resolver is described which includes only a core having a shape in which a gap permeance changes in a sinusoidal shape with respect to an angle θ between the rotor and the stator. In this resolver, the number of poles of the excitation winding is the same as the number of slots, and the induced voltage distribution generated in the output winding for one phase of the n-phase output winding is a sine wave distribution. Is wound. In addition, the excitation winding and the output winding are distributedly wound in such a manner that the windings are inserted into the slots at every slot pitch, that is, without slot skipping with respect to the slots.

  Further, Patent Document 2 includes a stator having slots provided at a plurality of locations in the circumferential direction, and an excitation winding, a SIN output winding, and a COS output winding are wound at every slot pitch, and a SIN output winding is provided. The line and the COS output winding are described as a resolver composed of distributed windings so that the induced voltage distribution is a sine wave distribution.

Japanese Patent No. 3182493 JP 2001-352734 A

  In the resolvers described in Patent Document 1 and Patent Document 2, there is a possibility that mechanical winding can be performed by a winding machine, but many excitation windings and output windings are wound at many winding locations of a plurality of teeth. Therefore, the winding process requires a lot of time, and there is room for improvement in terms of facilitating the manufacturing work and reducing costs. Further, in a resolver using a high frequency electric frequency, the number of teeth forming a magnetic flux path is important from the viewpoint of improving the accuracy of rotation angle detection. For this reason, in the configuration in which the number of teeth is simply reduced to reduce the cost and the number of windings wound around the teeth is reduced, the detection accuracy of the rotation angle may be lowered.

  An object of the present invention is to facilitate manufacturing work and reduce costs while suppressing a decrease in detection accuracy of a rotation angle in a resolver.

  A resolver according to the present invention includes a plurality of teeth made of a magnetic material that are spaced apart in the circumferential direction, a slot provided between teeth that are adjacent in the circumferential direction, and a plurality of excitation windings wound around the plurality of teeth. The gap permeance between the stator including the wire and the multi-phase output winding and the rotation angle detection surface provided on the outer peripheral surface includes an arc with respect to the rotation angle θ. A rotor having a detection surface for detecting a rotation angle that changes in a continuous wave shape, and a rotor arranged to be rotatable with respect to the stator, and the excitation winding is wound over two teeth every two slot pitches. The number of poles of the excitation winding is ½ of the total number of slots, and the induced voltage distribution generated in each phase of the output winding is distributed in a continuous wave shape including an arc. The output winding is 2 slot picks A resolver, characterized in that it is wound in distributed winding over two teeth per.

  In the resolver according to the present invention, preferably, the stator includes a plurality of magnetic members that magnetically connect adjacent excitation windings and adjacent output windings, and each magnetic member is separated in the circumferential direction. And is formed in a U-shape including a pair of body portions around which adjacent excitation windings and adjacent output windings are wound, and a connection portion connecting the pair of body portions.

  In the resolver according to the present invention, preferably, a nonmagnetic member is provided between the magnetic members adjacent in the circumferential direction.

  According to the resolver of the present invention, the excitation winding is wound across two teeth every two slot pitches, so that the number of poles of the excitation winding is ½ of the total number of slots. The output winding of each phase is wound with distributed winding over two teeth every two slot pitches, so the number of winding points can be reduced, the time required for the winding process can be reduced, and the manufacturing work is facilitated. And cost reduction. In addition, since the number of teeth does not decrease greatly, it is possible to suppress a decrease in the detection accuracy of the rotation angle. Further, the rotor has a detection surface for detecting a rotation angle that is provided on the outer peripheral surface, and the gap permeance with the stator changes in a continuous wave shape including an arc with respect to the rotation angle θ. Since the output winding of each phase is wound by distributed winding over two teeth every two slot pitches so that the induced voltage distribution generated in minutes becomes a distribution in a continuous wave shape including an arc, the output voltage The high frequency component contained in can be reduced, and the output accuracy can be further improved. Moreover, the mechanical winding by the winding machine can be easily performed, and the cost can be further reduced. As a result, it is possible to facilitate the manufacturing operation and reduce the cost while suppressing a decrease in the detection accuracy of the rotation angle.

It is a schematic diagram which shows the circumferential direction part of the stator which comprises the resolver of 1st Embodiment which concerns on this invention. In FIG. 1, in order to explain the magnetic flux which passes a rotor and a stator, it is a schematic diagram which shows a resolver with fewer winding locations. FIG. 3 is a diagram for explaining a winding configuration and an output voltage in a case where winding portions are provided every 45 degrees in the configuration of FIG. 2. It is a figure which shows a part of circumferential direction of one example of the concrete structure of the stator of FIG. It is a schematic diagram which shows a part of circumferential direction of the stator which comprises the resolver of a comparative example. It is a perspective view which shows the resolver of 2nd Embodiment which concerns on this invention. FIG. 7 is a perspective view showing the configuration of FIG. 6 excluding the mounting plate and the resin portion. It is a perspective view which shows the magnetic body member which comprises the resolver of FIG. It is a perspective view which decomposes | disassembles and shows the resolver of FIG. It is a figure which shows a magnetic body member and a coil | winding in the resolver of 3rd Embodiment concerning this invention. It is a perspective view which takes out and shows a magnetic body member from FIG. In the structure of FIG. 10, it is a figure which shows a mode that a magnetic flux flows between a magnetic body member and a rotor. It is a figure which shows the magnetic body member and winding which comprise the resolver of 4th Embodiment concerning this invention. It is a perspective view which takes out and shows a magnetic body member from FIG. FIG. 14 is a perspective view of FIG. 13. It is a figure which shows the magnetic body member and winding which comprise the resolver of 5th Embodiment concerning this invention. It is a perspective view which takes out and shows a magnetic body member from FIG. It is a figure which shows the magnetic body member which comprises the resolver of 6th Embodiment concerning this invention.

[First Embodiment]
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment according to the present invention. The resolver of the present embodiment is used for detecting a rotation angle of a rotating shaft constituting a rotating electric machine used as a motor generator of a hybrid vehicle, for example. The motor generator has a function as a motor or a generator.

  FIG. 1 is a schematic view showing a part in the circumferential direction of a stator constituting the resolver of the present embodiment. FIG. 2 is a schematic diagram showing a resolver with fewer winding points in order to explain the magnetic flux passing through the rotor and stator in FIG. As shown in FIG. 1, the resolver faces the rotor 12 (FIG. 2) that is coaxially fitted and fixed to the radially outer side of the rotating shaft 10 (FIG. 2), and the rotor 12 radially outward. And a stator 14 fixed inside a case (not shown).

  As shown in FIG. 2, the rotor 12 is made of a magnetic material such as a laminated steel plate formed by laminating a plurality of steel plates in the axial direction, for example, and a center for fitting the rotating shaft 10 at the center. A hole is formed. In addition, the outer peripheral surface of the rotor 12 has a curved shape with a non-circular cross section having peak portions 16 provided at two positions on the opposite side in the diametrical direction, and the outer diameter at the position corresponding to the peak portion 16 is maximized. The outer diameters at positions corresponding to two positions in the circumferential direction that are 90 degrees out of phase with the portion 16 are minimized. Such an outer peripheral surface of the rotor 12 faces the stator 14 (FIG. 1) and forms an outer detection surface 18 for detecting a rotation angle. That is, the rotor 12 has the outer detection surface 18 on the outer peripheral surface. The rotor 12 is disposed so as to be rotatable with respect to the stator 14.

  The shape of the outer peripheral surface of the rotor 12 is not limited to the example shown in the figure, and various shapes such as, for example, protrusions protruding in the radial direction at a plurality of circumferential positions on the cylindrical surface are formed. it can.

  As shown in FIG. 1, the stator 14 includes an annular core 20, a plurality of teeth 22 made of a magnetic material provided on the inner peripheral side of the core 20 and spaced apart in the circumferential direction, and in the circumferential direction. A slot 24 provided between adjacent teeth 22, a plurality of excitation windings 26 wound around each of the plurality of teeth 22, and a SIN output winding 28 and a COS output winding 30 which are output windings of a plurality of phases; including.

  As shown in FIG. 2, the gap permeance between the outer detection surface 18 provided on the rotor 12 and the tip of the tooth 22 of the stator 14 is a continuous wave including an arc with respect to the rotation angle θ of the rotor 12. For example, it changes in a sine wave shape. The outer detection surface 18 of the rotor 12 is simply circular, and the rotation center axis of the rotor 12 and the center axis of the stator 14 are shifted, that is, decentered, so that the gap permeance is circular with respect to the rotation angle θ. It is also possible to change into a continuous wave shape including, for example, a sine wave shape.

  On the other hand, among the plurality of excitation windings 26 and the output windings 28 and 30, the plurality of excitation windings 26 are for one phase, and are wound over two teeth 22 every two slot pitches. The respective excitation windings 26 adjacent to each other in the circumferential direction are connected in series with each other. For this reason, the number of poles of the excitation winding 26 is ½ of the total number of slots 24. Further, the plurality of exciting windings 26 are alternately changed in the normal winding and the reverse winding in the circumferential direction of the stator 14. Therefore, as indicated by broken line arrows in FIG. 2, the magnetic flux passes through the rotor 12 and the stator 14.

  In addition, the SIN output winding 28 and the COS output winding 30 which are a plurality of two-phase output windings each have a distribution in which the induced voltage generated in each phase includes a continuous wave shape including an arc, for example, a sine wave shape. In this manner, the output windings 28 and 30 of each phase are wound in distributed winding over the same two teeth 22 as the teeth 22 around which the respective excitation windings 26 are wound every two slot pitches. In other words, the output windings 28 and 30 of each phase are gradually shifted to a plurality of locations in the circumferential direction of the stator 14 such that the number of turns is a sinusoidal distribution, for example, so that the number of turns of the output windings 28 and 30 is a continuous wave distribution including an arc. It is distributed and rolled up.

  Further, the output windings 28 and 30 of each phase are connected in series in the circumferential direction. In FIGS. 1 and 2, the excitation winding 26, the SIN output winding 28, and the COS output winding 30 are illustrated as being the same. The different windings 26, 28, and 30 are wound over the same two teeth 22.

  The SIN output winding 28 and the COS output winding 30 are offset from each other by 90 ° in electrical angle. FIG. 3 is a diagram for explaining the winding configuration and the output voltage in the case of the configuration of FIG. 2 where the winding locations are provided every 45 degrees. In the following description, the same elements as those shown in FIGS. 1 and 2 are denoted by the same reference numerals. As shown in FIG. 3, the number of turns of the output windings 28 and 30 of each phase is the number of turns proportional to SINθ or COSθ with respect to the rotation angle θ, and the polarity corresponding to the winding direction has the excitation winding 26. And the SIN output voltage or COS output voltage. That is, when the excitation winding 26 is forward winding and the output windings 28 and 30 are forward winding, an in-phase output is output, and when the excitation winding 26 is forward winding and the output windings 28 and 30 are reverse winding, a reverse phase output is output. Is output. Further, when the excitation winding 26 is reverse winding and the output windings 28 and 30 are forward winding, a reverse phase output is output, and when the excitation winding 26 is reverse winding and the output windings 28 and 30 are reverse winding, an in-phase output is output. To be. In this way, the polarity of the output windings 28 and 30 of each phase, that is, whether the winding is normal or reverse is determined. The SIN output voltage of the SIN output winding 28 and the COS output voltage of the COS output winding 30 are SIN and COS, respectively.

  FIG. 4 shows a specific configuration of the present embodiment. In FIG. 4, elements corresponding to the elements shown in FIGS. 1 and 2 are indicated by the same reference numerals except for the teeth 22 and the body portion 32. FIG. 4 is a diagram showing a part in the circumferential direction of an example of a specific structure of the stator in FIG. 1. As shown in FIG. 4, the stator 14 includes an annular mounting plate 34 formed of a nonmagnetic material such as a resin, a plurality of magnetic members 36, and a molding resin 38.

  Each magnetic member 36 is formed as shown in FIG. 8 showing a second embodiment to be described later. That is, as shown in FIG. 8, each magnetic member 36 is manufactured by bending a thin plate made of a magnetic material such as an electromagnetic steel plate such as a silicon steel plate. Further, the magnetic members 36 are arranged apart from each other in the circumferential direction (in the case of simply “circumferential direction”, the circumferential direction of the stator), and adjacent to the excitation winding 26 (FIG. 4) and the circumferential direction in the circumferential direction. Are formed in a U-shape including a pair of body portions 32 around which the respective output windings 28 and 30 (FIG. 4) are wound, and a connecting portion 40 for connecting the pair of body portions 32. The pair of body parts 32 constitutes a tooth. As shown in FIG. 4, each magnetic member 36 includes excitation windings 26 adjacent in the circumferential direction, SIN output windings 28 adjacent in the circumferential direction, and COS output windings 30 adjacent in the circumferential direction. Each is magnetically connected. The excitation winding 26 and the output windings 28 and 30 are connected to an external arithmetic circuit (not shown).

  Further, the molding resin 38 is fixed to the mounting plate 34 to mold the excitation winding 26 and the output windings 28 and 30 and a part of the magnetic member 36. That is, the molding resin 38 includes an annular portion 42 that is fixed to the inner peripheral portion of the mounting plate 34, a protruding portion 44 that is a bobbin-shaped portion that protrudes radially inward at a plurality of locations in the circumferential direction of the annular portion 42, and And a flange 46 provided at the tip of the protrusion 44 and protruding on both sides in the circumferential direction. The connecting portion 40 of each magnetic member 36 is molded on the annular portion 42, and the portions excluding the tip of the body portion 32 of each magnetic member 36 are molded on the protrusion 44 and the flange portion 46. The front end portion of each body portion 32 protrudes from the front end surface of the flange portion 46. In each protrusion 44, the body part 32 of the adjacent magnetic body member 36 is disposed at both ends in the circumferential direction. For this reason, a part of the molding resin 38 which is a non-magnetic member is provided between the magnetic members 36 adjacent in the circumferential direction. An excitation winding 26, a SIN output winding 28, and a COS output winding 30 are wound around each protrusion 44. Each flange 46 prevents the windings 26, 28, 30 from falling off the protrusion 44.

  The basic function of the configuration of FIG. 4 is the same as that of the configuration shown in the schematic diagram of FIG. That is, in the configuration of FIG. 4, each body portion 32 of the magnetic member 36 corresponds to the tooth 22 of the configuration of FIG. A slot 24 is formed between protrusions 44 adjacent in the circumferential direction on the inner peripheral portion of the stator 14. In addition, the slot 24 is also formed in a groove-like portion formed between the front end portion of the body portion 32 of the magnetic body member 36 adjacent in the circumferential direction and the front end surface of the flange portion 46 that is molded in each protrusion 44. Is formed. For this reason, similarly to the configuration of FIG. 1, the excitation winding 26 is wound over the body portion 32 that is two teeth every two slot pitches. For this reason, the number of poles of the excitation winding 26 is ½ of the total number of the body portions 32.

  In addition, the output windings 28 and 30 of each phase have a two-slot pitch so that the induced voltage distribution generated in each phase of the output windings 28 and 30 has a continuous wave shape including a circular arc such as a sine wave. Each of the projections 44 is wound around the two body portions 32 by distributed winding. Further, the gap permeance between the outer detection surface 18 for detecting the rotation angle of the rotor 12 (FIG. 2) and the front end of the body portion 32 changes in a continuous wave shape including an arc such as a sine wave with respect to the rotation angle θ. Like to do.

  According to such a resolver, the excitation winding 26 is wound across the body portion 32 which is two teeth every two slot pitches, so that the number of poles of the excitation winding 26 is 1 / of the total number of the slots 24. Further, the output windings 28 and 30 of each phase are wound in distributed winding over the two body portions 32 every two slot pitches. For this reason, the number of winding points can be reduced, the time required for the winding process can be reduced, the manufacturing work can be facilitated, and the cost can be reduced. In addition, since the number of the body parts 32 made of a magnetic material is not greatly reduced, it is possible to suppress a decrease in detection accuracy of the rotation angle. That is, in a resolver that uses a high-frequency electric frequency, the accuracy of rotation angle detection can be improved as the number of body portions 32 that are teeth forming a magnetic flux path increases. That is, the number of poles of the excitation winding 26 is reduced, and the rotational angle detection accuracy is sufficiently high even though the output windings 28 and 30 of each phase are wound across the two body portions 32 every two slot pitches. Can be secured.

  Further, since the thickness in the circumferential direction of each body portion 32 can be reduced and the circumferential length of each projection 44 can be reduced, the winding lengths of the excitation winding 26 and the output windings 28 and 30 of each phase are shortened. It becomes easy to do. That is, in a resolver that uses a high frequency electric frequency, a portion of the stator 14 that is made of a magnetic material around which the windings 26, 28, and 30 are wound by the skin effect is formed on a surface portion that faces each winding 26, 28, 30. Only magnetic flux flows. For this reason, the thickness of each trunk | drum 32 which is a part made from a magnetic material can be made small enough in the circumferential direction. In addition, since it is not necessary to provide a magnetic material portion between the body portions 32, the weight can be reduced.

  Further, since a part of the molding resin 38 which is a non-magnetic material member is provided between the magnetic members 36 adjacent to each other in the circumferential direction, the body portion 32 can be deformed by tightening the windings 26, 28 and 30. Therefore, the strength of the portion around the windings 26, 28 and 30 can be improved.

  Further, the rotor 12 has an outer detection surface 18 that is provided on the outer peripheral surface, and in which the gap permeance with the stator 14 changes in a continuous wave shape including an arc with respect to the rotation angle θ. The output windings 28 and 30 of each phase are wound by distributed winding across the two body portions 32 every two slot pitches so that the induced voltage distribution generated in each phase is a continuous wave distribution including an arc. It is. For this reason, the high frequency component contained in an output voltage can be reduced, and output accuracy can be improved more. Moreover, the mechanical winding by the winding machine can be easily performed, and the cost can be further reduced. As a result, it is possible to facilitate the manufacturing operation and reduce the cost while suppressing a decrease in the detection accuracy of the rotation angle.

  In the above embodiment, the case where the SIN output winding 28 and the COS output winding 30 in which the induced voltage is distributed in a sinusoidal form is used as the output windings 28 and 30 of the plurality of phases has been described. However, the multiple-phase output windings 28 and 30 are not limited to such a configuration, and the induced voltage distribution generated in each phase of the output windings 28 and 30 is a continuous arc including a sine wave. It may be a wavy distribution. Further, the gap permeance between the outer detection surface 18 provided on the outer peripheral surface of the rotor 12 and the tip of the body portion 32 is not limited to a configuration that changes sinusoidally with respect to the rotation angle θ. It is good also as a structure which changes to the continuous wave shape containing circular arcs other than a sine wave with respect to angle (theta). For this reason, the shape accuracy of the outer shape of the rotor 12 can be prevented from being excessively increased, the manufacturing operation can be facilitated, and the time required for shape management can be further reduced. Therefore, it becomes easy to reduce the manufacturing cost of the resolver.

  Furthermore, in the configuration shown in FIG. 4, since the mounting plate 34 and the molding resin 38 of the stator 14 can be formed of resin, many portions other than the windings of the stator 14 are formed by a magnetic material such as a laminated steel plate. To reduce weight.

  On the other hand, FIG. 5 is a schematic view showing a part in the circumferential direction of the stator 14 constituting the resolver of the comparative example. In the resolver of this comparative example, an excitation winding 26, a SIN output winding 28, and a COS output winding 30 are wound around each tooth 22 provided on the inner peripheral portion of the stator 14 at a pitch of 1 slot. In addition, the SIN output winding 28 and the COS output winding 30 are distributed by winding a plurality of teeth 22 so that the induced voltage distribution generated in each of the teeth 22 is one slot pitch and the distribution is a sinusoidal shape. It is rolled up.

  In such a comparative example, the number of excitation windings 26 and the number of output windings 28 and 30 of each phase are the same as the total number of slots 24, respectively. For this reason, the number of winding points increases, and the time required for the winding process becomes long. Therefore, there is room for improvement in terms of facilitating the manufacturing operation and reducing costs. On the other hand, according to the embodiment shown in FIGS.

[Second Embodiment]
6 to 9 show a second embodiment of the present invention. FIG. 6 is a perspective view showing the resolver of the present embodiment. FIG. 7 is a perspective view showing the configuration of FIG. 6 except for the mounting plate and the resin portion. FIG. 8 is a perspective view showing a magnetic member constituting the resolver of FIG. FIG. 9 is an exploded perspective view of the resolver of FIG.

  As shown in FIG. 6, the stator 14 constituting the resolver of the present embodiment includes an annular mounting plate 34 provided on the outer peripheral portion, a molding resin 48 fitted and fixed to the mounting plate 34, and a circumferential direction. An excitation winding 26, a SIN output winding 28, and a COS output winding 30 are disposed at a plurality of locations.

  Further, as shown in FIG. 7, among the magnetic members 36 in which the excitation winding 26, the SIN output winding 28, and the COS output winding 30 are spaced apart at a plurality of locations in the circumferential direction of the inner peripheral portion of the stator 14. The pair of body portions 32 facing each other in the circumferential direction of the adjacent magnetic body members 36 are wound around the body portions 32 of each set. In the following description, the excitation winding 26, the SIN output winding 28, and the COS output winding 30 may be collectively described as the stator winding R in some cases.

  A part of each body part 32 is molded by a part of the molding resin 48 shown in FIG. Each excitation winding 26, each SIN output winding 28, and each COS output winding 30 are connected to a conductor portion 54 constituting a terminal unit 52 provided on the outer peripheral portion of the mounting plate 34, and are connected to the conductor portion 54. A lead wire (not shown) can be connected to the terminal 56.

  The shape of the magnetic member 36 shown in FIG. 8 is the same as that described in the first embodiment, and thus a duplicate description is omitted. When forming the stator 14, as shown in FIG. 9, with the stator winding R and the magnetic member 36 disposed on the inner peripheral side of the mounting plate 34, a molding resin 38 is attached to the mounting plate 34. The member 36 is resin molded.

  Similarly to the first embodiment described above, each phase is set so that the induced voltage distribution generated in each phase of the output windings 28 and 30 is a continuous wave shape including an arc such as a sine wave. The output windings 28 and 30 are wound in distributed winding every two slot pitches, that is, over the two body portions 32 around each protrusion 44 (FIG. 9).

  Even in the case of such a resolver, it is possible to facilitate the manufacturing operation and reduce the cost while suppressing a decrease in the detection accuracy of the rotation angle. Other configurations and operations are the same as those in the first embodiment.

[Third Embodiment]
10-12 show a third embodiment of the present invention. FIG. 10 is a diagram illustrating the magnetic member 36 and the windings 26, 28, and 30 in the resolver according to the present embodiment. FIG. 11 is a perspective view showing the magnetic member 36 taken out from FIG. FIG. 12 is a diagram showing how magnetic flux flows between the magnetic member 36 and the rotor 12 in the configuration of FIG. 10.

  In the stator 14 constituting the resolver of the present embodiment, among the distal end portions of the body portion 32 provided on the magnetic member 36, the stator winding R has a radial direction (in the case of simply referred to as “radial direction”), the radial direction of the stator is The same applies hereinafter.) A circumferential portion 58 is provided by bending a portion protruding inward so as to face the outside of the stator winding R in the circumferential direction. For this reason, as shown in FIG. 11, the front-end | tip part of a pair of trunk | drum 32 of each magnetic body member 36 is bent so that it may mutually approach. For this reason, the opposing area of the front-end | tip part of each magnetic body member 36 and the rotor 12 can be enlarged. That is, as shown by an arrow α in FIG. 12, the magnetic flux flowing from the circumferential portion 58 on one side (right side in FIG. 12) of the stator 14 to the rotor 12 flows in the rotor 12 as shown by an arrow β in FIG. And, as indicated by an arrow γ, it flows to the circumferential portion 58 on the other circumferential side of the stator 14 (left side in FIG. 12). Thus, since the opposing area of the front-end | tip part of the trunk | drum 32 and the rotor 12 can be enlarged, the stator 14 can receive magnetic flux in a wider range and can suppress magnetic flux leakage. Other configurations and operations are the same as those of the second embodiment shown in FIGS.

[Fourth Embodiment]
13 to 15 show a fourth embodiment of the present invention. FIG. 13 is a diagram showing the magnetic member 60 and the windings 26, 28, and 30 constituting the resolver of this embodiment. FIG. 14 is a perspective view showing the magnetic member 60 taken out from FIG. FIG. 15 is a perspective view of FIG.

  In the stator that constitutes the resolver of the present embodiment, as shown in FIG. 14, the magnetic member 60 is formed by forming a magnetic material such as iron or steel into a wire shape, and a pair of body portions 62 and And a connection portion 64 that connects the pair of body portions 62 to each other. The cross section of the wire member shape of the magnetic member 60 may be round, rectangular, or other shapes. In addition, in the tip part of each body part 62 provided on the magnetic body member 60, the part protruding radially inward from the stator winding R (FIG. 13) is referred to as the axial direction (simply referred to as “axial direction”). Is bent so as to face in the same direction. For this reason, as shown in FIG. 14, the distal end portions of the pair of body portions 62 of each magnetic member 60 are bent at substantially right angles so as to face in the same direction parallel to each other, and an axial portion 66 is provided. . For this reason, the opposing area of the radial direction of the front-end | tip part of each magnetic body member 60 and the rotor 12 can be enlarged. In addition, since the tip of the magnetic member 60 has a linear shape extending in the axial direction, the accuracy error in the thrust direction, which is the axial direction, shown in FIG. 15 can be suppressed. That is, even when the stator winding R moves in the thrust direction, the rotor 12 and the magnetic member 60 can be opposed to each other with a sufficiently large area. Other configurations and operations are the same as those of the second embodiment shown in FIGS.

[Fifth Embodiment]
16-17 is the 5th Embodiment of this invention. FIG. 16 is a diagram showing the magnetic member 68 and the windings 26, 28, and 30 constituting the resolver of the present embodiment. FIG. 17 is a perspective view showing the magnetic member 68 taken out from FIG.

  In the resolver of this embodiment, the magnetic body member 68 is formed in a U-shape as a whole by laminating a plurality of U-shaped wire rods 70. Each wire 70 is formed of a magnetic material such as iron or steel, and may be a wire having a square wire, a round wire, or another cross-sectional shape. According to such a configuration, eddy current loss in the magnetic member 68 can be reduced. Other configurations and operations are the same as those of the second embodiment shown in FIGS.

[Sixth Embodiment]
FIG. 18 is a diagram showing a magnetic member 72 constituting the resolver according to the sixth embodiment of the present invention. In the resolver of this embodiment, the magnetic member 72 is configured by laminating a plurality of thin plate members 74 having a U-shaped cross section in the thickness direction. Each plate 74 is made of a magnetic material such as iron or steel. According to such a configuration, eddy current loss in the magnetic member 72 can be reduced. Other configurations and operations are the same as those of the second embodiment shown in FIGS.

  10 rotating shafts, 12 rotors, 14 stators, 16 peaks, 18 outer detection surfaces, 20 cores, 22 teeth, 24 slots, 26 excitation windings, 28 SIN output windings, 30 COS output windings, 32 fuselage units, 34 Mounting plate, 36 magnetic member, 38 molding resin, 40 connecting portion, 42 annular portion, 44 projecting portion, 46 flange portion, 48 molding resin, 52 terminal unit, 54 conductor portion, 56 terminal, 58 circumferential portion, 60 Magnetic body member, 62 Body part, 64 Connection part, 66 Axial direction part, 68 Magnetic body member, 70 Wire material, 72 Magnetic body member, 74 Plate material.

Claims (3)

A plurality of teeth made of magnetic material arranged in the circumferential direction, a slot provided between teeth adjacent in the circumferential direction, a plurality of excitation windings wound around the plurality of teeth, and a plurality of output windings A stator including a wire;
A detection surface for detecting the rotation angle provided on the outer peripheral surface, the gap permeance with the tip of the tooth changing in a continuous wave shape including an arc with respect to the rotation angle θ. And a rotor arranged to be rotatable with respect to the stator,
The excitation winding is wound across two teeth every two slot pitches, so that the number of excitation winding poles is ½ of the total number of slots.
The output windings of each phase are wound with distributed windings across two teeth every two slot pitches so that the induced voltage distribution generated in each phase of the output windings is a continuous wave distribution including an arc. A resolver characterized by The resolver according to claim 1, wherein
The stator includes a plurality of magnetic members that magnetically connect adjacent excitation windings and adjacent output windings,
Each magnetic member is arranged in a circumferential direction and includes a pair of body parts around which adjacent excitation windings and adjacent output windings are wound, and a U-shape including a connection part that connects the pair of body parts A resolver characterized in that it is formed. The resolver according to claim 1 or 2,
A resolver, wherein a nonmagnetic member is provided between magnetic members adjacent in the circumferential direction.

Images