JP5320154B2 - Motor structure with rotation detector - Google Patents

Description

  The present invention relates to a casing, a stator and a bearing provided in the casing, a rotating shaft that is rotatably supported by the casing via the bearing, a rotor that is provided to rotate integrally with the rotating shaft, and a rotation angle of the rotor The present invention relates to a motor structure with a rotation detector provided with a rotation detector for detecting the rotation.

  Conventionally, high output brushless motors are used in hybrid vehicles and electric vehicles. In order to control a brushless motor of a hybrid vehicle, it is necessary to accurately grasp the rotational position 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. In particular, in an automobile, since cogging deteriorates drivability, there is a demand for reducing the cogging, and thus there is a strong demand for accurately switching energization.

  Here, a resolver is used for detecting the position of the motor shaft of an automobile in order to satisfy functions such as high temperature resistance, noise resistance, vibration resistance, and high humidity resistance. The resolver is incorporated in the motor and is directly attached to the rotor shaft of the motor.

  FIG. 15 is a cross-sectional view of the rotation detector-equipped motor 100 disclosed in Patent Document 1. A stator 102 is fixed on the inner periphery of the casing 108. A bus bar 101 is attached to one end of the stator 102, and a resolver stator 103 is fixed to the inner peripheral end surface of the bus bar 101. The resolver stator 103 includes a wound resolver stator coil 104.

  On the other hand, a pair of bearings 109 is fixed to the casing 108, and the rotating shaft 105 of the rotor 106 is rotatably supported by the pair of bearings 109. A resolver rotor 107 is fixed to the rotary shaft 105 at a position facing the resolver stator 103. The resolver stator 103 and the resolver rotor 107 constitute a resolver that is a rotation detector.

JP 2007-124757 A

  However, the structure of the conventional motor 100 with a rotation detector has the following problems. That is, when the resolver rotor 107 faces the resolver stator 103 around which the resolver stator coil 104 is wound, the resolver rotor 107 has substantially the same width, so that the length of the rotating shaft 105 in the axial center direction becomes long. Therefore, there is a problem that the entire motor becomes large in the axial direction of the rotation shaft.

  In addition, there is a problem that the magnetic field generated in the motor stator 102 adversely affects the resolver stator 103 and the resolver rotor 107 as noise. For this reason, there existed a possibility that the angle detection accuracy of a resolver might fall.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor structure with a rotation detector that can shorten the axial length of the rotation shaft of the motor. To do. Another object of the present invention is to provide a motor structure with a rotation detector that can improve the angle detection accuracy by the rotation detector.

The motor structure with a rotation detector according to the present invention, which has been made to solve the above problems, has the following configuration.
(1) A casing, a stator provided in the casing, a bearing provided in the casing, a rotating shaft rotatably supported by the casing via the bearing, and a rotor provided to be rotatable integrally with the rotating shaft And a rotation detector for detecting a rotation angle of the rotor, the rotation detector is held in the casing, and a disk-shaped resolver having a thin-film coil formed on the surface thereof A stator member, a disk-shaped resolver rotor member provided on an end surface of the rotor and having a thin-film coil formed on the surface, a shield member provided between the rotor and the resolver rotor member, and the resolver rotor member are The shield member is attached to the end face of the rotor via a shield member, and the shield member is formed of a nonmagnetic conductive material .
(2) In the motor structure with a rotation detector described in (1), the thin film coil formed on the resolver rotor member is formed as a thin film pattern on the surface of the resolver rotor member by an ink jet printer. And
(3) In the motor structure with a rotation detector described in (2), a resolver rotor member is obtained by baking an ink liquid in which a thin film pattern is dispersed in a dispersing agent with an ink jet printer. It is characterized by being fixed to.
( 4 ) In the motor structure with a rotation detector described in any one of (1) to (3) , the shield member is a copper plate or copper plating.
( 5 ) In the motor structure with a rotation detector described in any one of (1) to ( 4 ), the resolver stator member and the bearing are positioned with respect to the casing.
( 6 ) In the motor structure with a rotation detector according to any one of (1) to ( 5 ), a part of the casing that holds the outer periphery of the resolver stator member is extended to the resolver rotor member, and the outer periphery of the resolver rotor member It is characterized by projecting into a cylindrical shape along the line to form a shield part. ( 7 ) The motor structure with a rotation detector described in ( 6 ) is characterized in that the casing and the shield portion are formed of a nonmagnetic conductive material.
( 8 ) In the motor structure with a rotation detector described in ( 6 ), the casing and the shield part are formed of a magnetic material.
( 9 ) In the motor structure with a rotation detector according to any one of (1) to ( 5 ), a cylindrical shield is provided between a part of the casing that holds the outer periphery of the resolver stator member and the resolver rotor member. A member is provided.
( 10 ) In the motor structure with a rotation detector described in ( 9 ), the shield member is formed of a nonmagnetic conductive material.
( 11 ) In the motor structure with a rotation detector described in ( 9 ), the shield member is formed of a magnetic material.
( 12 ) In the motor structure with a rotation detector described in ( 1 ), the outer peripheral edge of the shield member provided between the rotor and the resolver rotor member is cylindrical along the outer periphery of the resolver rotor member to the vicinity of the resolver stator member. It protrudes in a shape.
( 13 ) In the motor structure with a rotation detector described in ( 12 ), the shield member is formed of a nonmagnetic conductive material.
( 14 ) In the motor structure with a rotation detector described in ( 12 ), the shield member is made of a magnetic material.

  Next, the operation and effect of the rotation detector-equipped motor structure of the present invention having the above configuration will be described.

  A motor structure with a rotation detector of the present invention includes a casing, a stator provided in the casing, a bearing provided in the casing, a rotating shaft rotatably supported by the casing via the bearing, and the rotating shaft. In a motor structure with a rotation detector provided with a rotor provided rotatably and a rotation detector for detecting the rotation angle of the rotor, the rotation detector is held by a casing, and a thin film coil is formed on the surface. Since the disk-shaped resolver stator member is formed, and the disk-shaped resolver rotor member provided on the end surface of the rotor and having a thin-film coil formed on the surface thereof, the thin-film resolver stator member and the resolver rotor are included. Since the member is disposed so as to face the axial center direction of the rotating shaft, the length occupied by the rotation detector in the axial center direction of the rotating shaft can be shortened.

  In addition, since the thin-film coil formed on the resolver rotor member is formed as a thin film pattern on the surface of the resolver rotor member by an ink jet printer, the thin film pattern can be accurately formed with a thickness of 10 μm or less, In addition, since a thin film pattern with an accurate width can be formed, the accuracy of the rotation detector can be improved.

  Furthermore, since the thin film pattern is fixed to the resolver rotor member by applying an ink liquid in which silver particles are dispersed in a dispersant and then firing the ink liquid, the thin film pattern is securely attached to the resolver rotor member. Can be fixed to.

  Further, since the shield member is provided between the rotor and the resolver rotor member, it may be affected by the magnetic field caused by the permanent magnet provided in the resolver rotor member and the magnetic field that is changed in the stator of the motor. Therefore, the rotation angle can be detected with high accuracy. Furthermore, since the shield member is a copper plate or copper plating, sufficient shielding can be performed against the lines of magnetic force.

  In addition, since the resolver stator member and the bearing are both positioned with respect to the casing, the positional relationship between the resolver rotor member and the resolver stator member whose positional accuracy is obtained by the rotating shaft is determined via the casing and the bearing. Positioning can be performed with high accuracy.

  Further, since a part of the casing that holds the outer periphery of the resolver stator member protrudes into a cylindrical shape along the outer periphery of the resolver rotor member up to the resolver rotor member, the resolver stator member and the resolver rotor member are It is less affected by a magnetic field that changes in the stator of the motor, and the rotation angle can be detected with high accuracy.

  Further, a part of the casing that holds the outer periphery of the resolver stator member is projected into a cylindrical shape along the outer periphery of the resolver rotor member up to the resolver rotor member, and the casing and the shield part are nonmagnetic conductive materials. Therefore, the magnetic field generated in the stator of the motor is converted into eddy current in the shield and changed into heat, and the resolver stator member and the resolver rotor member may be affected by the magnetic field. As a result, the rotation angle can be accurately detected.

  Further, a part of the casing that holds the outer periphery of the resolver stator member is projected into a cylindrical shape along the outer periphery of the resolver rotor member up to the resolver rotor member, and the casing and the shield portion are formed of a magnetic material. Therefore, the resolver stator member and the resolver rotor member are less affected by the magnetic field that changes in the stator of the motor, and the rotation angle can be detected with high accuracy.

  In addition, since the cylindrical shield member is provided between a part of the casing that holds the outer periphery of the resolver stator member and the resolver rotor member, the resolver stator member and the resolver rotor member may change in the motor stator. The influence of the magnetic field is reduced, and the rotation angle can be detected with high accuracy. In addition, a material having a higher shielding effect than the casing can be used for the shielding member.

  Also, a cylindrical shield member is provided between a part of the casing that holds the outer periphery of the resolver stator member and the resolver rotor member, and the shield member is formed of a nonmagnetic conductive material. The changing magnetic field generated in the stator is converted into eddy current by the shield member and converted into heat, and the resolver stator member and resolver rotor member are less affected by the magnetic field, and the rotation angle can be detected. It can be performed with high accuracy. In addition, a material having a higher shielding effect than the casing can be used for the shielding member.

  In addition, since a cylindrical shield member is provided between a part of the casing that holds the outer periphery of the resolver stator member and the resolver rotor member, and the shield member is formed of a magnetic material, the resolver stator member and the resolver rotor The member is less affected by a magnetic field that changes in the stator of the motor, and the rotation angle can be detected with high accuracy. In addition, a material having a higher shielding effect than the casing can be used for the shielding member.

  Further, since the outer peripheral edge of the shield member provided between the rotor and the resolver rotor member is projected in a cylindrical shape along the outer periphery of the resolver rotor member to the vicinity of the resolver stator member, the resolver stator member and the resolver rotor member However, it is less affected by the changing magnetic field generated in the stator of the motor, and the rotation angle can be detected with high accuracy.

  Further, the outer peripheral edge of the shield member provided between the rotor and the resolver rotor member is projected in a cylindrical shape along the outer periphery of the resolver rotor member to the vicinity of the resolver stator member, and the shield member is made of a nonmagnetic conductive material. As a result, the magnetic field generated in the stator of the motor is converted into eddy current by the shield member and changed into heat, and the resolver stator member and the resolver rotor member are less affected by the magnetic field. Thus, the rotation angle can be detected with high accuracy.

  Further, since the outer peripheral edge of the shield member provided between the rotor and the resolver rotor member is projected in a cylindrical shape along the outer periphery of the resolver rotor member to the vicinity of the resolver stator member, the shield member is formed of a magnetic material. The resolver stator member and the resolver rotor member are less affected by a magnetic field that changes in the stator of the motor, and the rotation angle can be detected with high accuracy.

It is sectional drawing which shows the structure of the motor which concerns on 1st Embodiment and incorporates a resolver. Similarly, it is a top view which shows a resolver rotor member. Similarly, it is AA sectional drawing of FIG. 2 which shows a resolver rotor member. Similarly, it is a figure which shows a resolver stator 1st pattern. Similarly, it is a figure which shows a resolver stator 2nd pattern. Similarly, it is a block circuit diagram showing a control configuration of a resolver. It is sectional drawing which concerns on 2nd Embodiment and shows the structure of the motor which incorporates a resolver. It is sectional drawing which concerns on 3rd Embodiment and shows the structure of the motor which incorporates a resolver. It is sectional drawing which concerns on 4th Embodiment and shows the structure of the motor which incorporates a resolver. Similarly, it is sectional drawing which shows a part of structure of a motor. Similarly, it is an expanded sectional view showing a part of structure of a motor. It is sectional drawing which concerns on 5th Embodiment and shows a part of structure of a motor. It is sectional drawing which concerns on 6th Embodiment and shows a part of structure of a motor. It is sectional drawing which concerns on 7th Embodiment and shows a part of structure of a motor. It is sectional drawing which shows the structure of the motor which concerns on a prior art and incorporates a resolver.

[First Embodiment]
Hereinafter, a first embodiment of the motor structure with a rotation detector according to the present invention will be described in detail with reference to the drawings.

  The structure of a motor incorporating a resolver as a rotation detector of this embodiment is shown in a sectional view in FIG. The outer casing is constituted by a motor casing 11 and a lid casing 20. A motor stator 12 is fixed inside the motor casing 11. A bearing 21 is attached to the motor casing 11. The bearing 21 is also attached to the inside of the lid casing 20, and the motor shaft 13 as a rotating shaft is rotatably held by the pair of bearings 21.

  A motor rotor 15 is attached to the motor shaft 13 via a guide 14, and a permanent magnet 16 is built and fixed in the motor rotor 15. The left end surface of the motor rotor 15 is in contact with the guide 14. A shield plate 18 is attached in contact with the right end surface of the motor rotor 15. The shield plate 18 is a copper plate. A resolver rotor member 19 is attached to the right side of the shield plate 18. The resolver rotor member 19 will be described later in detail.

  The motor shaft 13 is formed with a step portion 13a having a smaller diameter than the diameter with which the guide 14 is fitted. Further, on the right side of the stepped portion 13a, a small diameter stepped portion 13b having a diameter smaller than the diameter of the stepped portion 13a is formed. A stopper 17 is fitted to the step portion 13a. A crimping portion 17 a is formed at the right end of the stopper 17. The small diameter step portion 13 b is in contact with the side surface of the inner ring of the bearing 21 through the spacer 22.

  A guide 14 is fitted and mounted on the motor shaft 13, and a motor rotor 15 is fitted and mounted on the guide 14. Next, in a state where the shield plate 18 and the resolver rotor member 19 are fitted and mounted on the outer periphery of the caulking portion 17a of the stopper 17, the caulking portion 17a of the stopper 17 is directed outward with a caulking tool (not shown). Thereby, the guide 14, the motor rotor 15, the shield plate 18, and the resolver rotor member 19 are fixed to the motor shaft 13.

  At this time, since the caulking tool caulks the caulking portion 17a evenly, the resolver rotor member 19 can be attached to the axis of the motor shaft 13 with high accuracy.

  On the other hand, a resolver stator member 23 is positioned and fixed on the inner surface of the lid casing 20. The resolver stator member 23 will be described later in detail.

  Next, the resolver rotor member 19 will be described. FIG. 2 shows a plan view of the resolver rotor member 19, and FIG. 3 shows the resolver rotor member 19 by a cross-sectional view taken along the line AA of FIG.

  The resolver rotor member 19 has a disk shape in which a circular center hole is formed at the center. The diameter is 100 to 150 mm. The material of the resolver rotor member 19 is PPS resin or LCP liquid crystal polymer, and the thickness is 3 to 5 mm.

  Resolver rotor patterns 30A, 30B, 30C, and 30D are formed on one surface of the resolver rotor member 19 (hereinafter also collectively referred to as “resolver rotor pattern 30”). A rotary transformer pattern 31 is formed near the center. The resolver rotor pattern 30 and the rotary transformer pattern 31 are formed by an ink jet printer. As the ink, a silver paste in which silver particles are dispersed in a dispersant is used. After the silver paste is applied with a thickness of 10 to 20 μm, it is fired. By firing, the dispersant sublimes, and a silver thin film having a thickness of 2 to 5 μm is fixed to the surface. The width of the resolver rotor pattern 30 is 0.5 mm.

  An insulating layer made of polyimide having a thickness of 10 μm is formed on the surfaces of the resolver rotor pattern 30 and the rotary transformer pattern 31. This insulating layer is also fired after applying polyimide.

  Inside the formed resolver rotor member 19, a backup core 41 is inserted at a position corresponding to the intermediate position surrounded by the resolver rotor pattern 30, and a backup core 42 is inserted at a position corresponding to the rotary transformer pattern 31. Built in by molding. The backup core 41 is for strengthening the magnetic field generated by the resolver stator member 19, and the backup core 42 is for strengthening the magnetic field generated by the rotary transformer pattern 31.

  The four resolver rotor patterns 30A, 30B, 30C, and 30D are each formed in a loop shape in a section divided by 90 degrees. After the four resolver rotor patterns 30A, 30B, 30C, and 30D are formed, an insulating layer made of polyimide is formed by baking except for the vicinity of the terminal portions of each pattern. On the insulating layer, connection lines (connection lines for connecting 37A and 37B in the figure) for connecting one end 34 of the resolver pattern 30A and one end of the resolver rotor pattern 30B are formed. This connection line is formed by an ink jet printer.

  Further, one end 34 of the resolver rotor pattern 30A is connected to one end 36 of the rotary transformer pattern 31 through a similar connection line. The other end of the resolver rotor pattern 30B is connected to one end of the resolver rotor pattern 30C through a similar connection line. The other end of the resolver rotor pattern 30C is connected to one end of the resolver rotor pattern 30D via a connection line (a connection line connecting 37C and 37D in the figure). The other end 34 of the resolver pattern 30D is connected to the other end 35 of the rotary transformer pattern 31 through a similar connection line.

  Thereafter, an insulating layer made of polyimide is formed by baking on the connection line and the terminal portion. As a result, the sum of the induced currents generated in the four resolver rotor patterns 30A, 30B, 30C, and 30D flows to the rotary transformer pattern 31 due to the change in the magnetic field.

  In the present embodiment, the connection is made by providing a multi-layer connection line on the same surface, but the connection may be made using the back surface using a through hole.

  Next, the resolver stator member 23 will be described. The resolver stator member 23 has a disk shape in which a circular center hole is formed at the center. The diameter is 100 to 150 mm. The material of the resolver stator member 23 is PPS resin or LCP liquid crystal polymer, and the thickness is 3 to 5 mm.

  The resolver stator member 23 is fitted and adhered to the inner surface of the lid casing 20 inside a positioning projection 20a formed as a circumferential projection. Thereby, the resolver stator member 23 is positioned with respect to the shaft center of the motor shaft 13 via the bearing 21.

  In this embodiment, the distance between the resolver rotor pattern 30 on the surface of the resolver rotor member 19 and the resolver stator second pattern 52 on the surface of the resolver stator member 23 is set to about 1.5 mm.

  FIG. 4 shows the first resolver stator pattern 51. As shown in FIG. 4, resolver stator first patterns 51 </ b> A, 51 </ b> B, 51 </ b> C, 51 </ b> D are formed on one surface of the resolver stator member 23. A rotary transformer pattern 57 is formed near the center.

  Further, a polyimide insulating layer having a thickness of 10 μm is formed on the surfaces of the first resolver stator pattern 51 and the rotary transformer pattern 57. This insulating layer is also fired after applying polyimide. Then, a resolver stator second pattern 52 shown in FIG. 5 that is 90 degrees out of phase with the resolver stator first pattern 51 is overlaid on the surface of the insulating layer.

  The resolver stator first pattern 51, the rotary transformer pattern 57, and the resolver stator second pattern 52 are formed by an ink jet printer. As the ink, a silver paste in which silver particles are dispersed in a dispersant is used. After the silver paste is applied with a thickness of 10 to 20 μm, it is fired. By firing, the dispersant sublimes, and a silver thin film having a thickness of 2 to 5 μm is fixed to the surface. The widths of the first resolver stator pattern 51, the rotary transformer pattern 57, and the second resolver stator pattern 52 are set to 0.5 mm.

  An insulating layer made of polyimide having a thickness of 10 μm is formed on the surface of the resolver stator second pattern 52. This insulating layer is also fired after applying polyimide.

  The four resolver stator first patterns 51A, 51B, 51C, 51D are connected by connection lines in the same manner as described with reference to FIGS. The resolver stator first pattern 51 is formed with a pair of input terminals 53. The input terminal 53 is connected to the drive circuit 56 as shown in FIG. FIG. 6 is a block circuit diagram showing a control configuration of the resolver.

  The four resolver stator second patterns 52A, 52B, 52C, and 52D are connected by the connection lines described in FIGS. A pair of input terminals 53 are formed on the resolver stator second pattern 52. The input terminal 53 is connected to the drive circuit 56 as shown in FIG.

  Next, the control configuration will be described. As shown in FIG. 6, a drive circuit 56 for generating a 7.2 kHz sin curve (Asin ωt) as a first excitation signal and a 7.2 kHz cos curve (Acos ωt) as a second excitation signal includes a resolver stator first. The first pattern 51 and the resolver stator second pattern 52 are connected. The resolver stator first pattern 51 is supplied with a sin curve from the drive circuit 56, and the resolver stator second pattern 52 is supplied with a cosine curve from the drive circuit 56. The sin curve and the cos curve have the same amplitude and are 90 degrees out of phase.

  In the resolver rotor pattern 30, the output signal ABsin (ωt + θ) is generated as an induced current. The output signal is input to the comparator 54 provided on the stator side via the rotary transformer patterns 31 and 57. On the other hand, a sin curve (Asinωt) is input from the drive circuit 56 to the comparator 55.

  In order to avoid erroneous detection due to noise, the position calculator 58 uses a dead band that does not respond to noise as a hysteresis voltage, and a predetermined hysteresis voltage is input to the comparator 54 that detects zero crossing.

  Similarly, in the comparator 55, the position calculator 58 inputs a dead band that does not respond to noise as a hysteresis voltage to the comparator 55 that detects a zero cross in order to avoid erroneous detection due to noise.

  Next, the operation of the resolver having the above configuration will be described. The resolver stator first pattern 51 is excited with a sin curve (Asin ωt) as a first excitation signal S1, and the resolver stator second pattern 52 is excited with a cosine curve as a second excitation signal, whereby a resolver rotor pattern. 30, ABsin (ωt + θ), which is the output signal S2, is generated as an induced current. The output signal S2 is input to the comparator 54 provided on the stator side via the rotary transformer patterns 31 and 57. On the other hand, a sin curve (Asin ωt) that is the first excitation signal S <b> 1 is input from the drive circuit 56 to the comparator 55. The position calculator 58 calculates the rotation angle of the motor rotor 15 from the difference between the zero cross detection timing of the comparator 54 and the zero cross detection timing of the comparator 55.

  As described above in detail, according to the motor structure with the rotation detector (resolver) of the present embodiment, the resolver is fixed to the lid casing 20, and the thin-film resolver stator first pattern 51 and the resolver stator are formed on the surface. A disc-shaped resolver stator member 23 in which the second pattern 52 is formed, and a disc-shaped resolver rotor member 19 fixed on the end surface of the motor rotor 15 and having a thin-film resolver rotor pattern 30 formed on the surface. Therefore, since the thin-film resolver stator first pattern 51 and the resolver stator second pattern 52 and the resolver rotor pattern 30 are arranged to face each other in the axial direction of the motor shaft 13, the resolver is disposed on the motor shaft 13. The length occupied in the axial center direction can be shortened.

  Further, since the resolver rotor pattern 30 is formed as a thin film pattern on the surface of the resolver rotor member 19 by an ink jet printer, the thin film pattern can be accurately formed with a thickness of 10 μm or less, and an accurate width Since a thin film pattern can be formed, the accuracy of the resolver can be improved.

  Furthermore, since the resolver rotor pattern 30 is fixed to the resolver rotor member 19 by applying an ink liquid in which silver particles are dispersed in a dispersant, and then baking the ink liquid, the thin film pattern is surely formed. It can be fixed to the resolver rotor member 19.

  Further, since the shield plate 18 is provided between the motor rotor 15 and the resolver rotor member 19, the influence of the magnetic field by the permanent magnet 16 provided in the motor rotor 15 and the influence of the magnetic field generated by the motor stator 12 are affected. Since it is rarely received, the rotation angle can be detected with high accuracy. Furthermore, since the shield member is the copper shield plate 18 or copper plating, sufficient shielding can be performed against the lines of magnetic force.

[Second Embodiment]
Next, the most suitable 2nd Embodiment which actualized the motor structure with a rotation detector of this invention is described in detail based on drawing.

  In addition, since each embodiment described below is almost the same as the first embodiment, the same portions are denoted by the same reference numerals as those in the first embodiment, and the description is omitted. Will only explain the differences.

  FIG. 7 is a cross-sectional view showing the structure of a motor incorporating a resolver. As shown in FIG. 7, the shield plate 18 and the resolver rotor member 19 are fixed to the step portion 13 a of the motor shaft 13 via the spacer 61. In other words, the shield plate 18 and the resolver rotor member 19 are positioned with respect to the motor shaft 13 by press-fitting the spacer 61 between the stepped portion 13 a and the inner diameter portions of the shield plate 18 and the resolver rotor member 19. And it is fixed.

[Third Embodiment]
Next, a most preferred third embodiment that embodies the motor structure with a rotation detector of the present invention will be described in detail with reference to the drawings.

  FIG. 8 is a cross-sectional view showing the structure of a motor incorporating a resolver. As shown in FIG. 8, the shield plate 62 and the resolver rotor member 19 are directly fixed to the step portion 13 a of the motor shaft 13. That is, the step portion 13a, the shield plate 62, and the inner diameter portion of the resolver rotor member 19 are fitted, and the shield plate 62 and the resolver rotor member 19 are fixed to the motor shaft 13 with an adhesive. ing.

  Further, the shield plate 62 includes an annular convex portion 62a protruding in the direction of the resolver rotor member 19 at the outermost peripheral end. By providing the annular protrusion 62a, the shielding performance against the resolver rotor member 19 can be enhanced.

[Fourth Embodiment]
Next, a fourth preferred embodiment that embodies the motor structure with a rotation detector of the present invention will be described in detail with reference to the drawings.

  FIG. 9 is a cross-sectional view showing the structure of a motor incorporating a resolver. FIG. 10 is an enlarged cross-sectional view of the interior of the chain ellipse S1 in FIG. FIG. 11 is an enlarged cross-sectional view of the feature portion of this embodiment in the chain line circle S2 of FIG.

  In this embodiment, the stopper 17 and the shield plate 18 of the first embodiment are omitted, the stepped portion 13a of the motor shaft 13 is shortened, and the resolver rotor member 19 is directly fixed to one end surface of the motor rotor 15. Thus, the configuration is different from that of the first embodiment. In this embodiment, the lid casing 20 that holds the resolver stator member 23 is formed of a nonmagnetic conductive material. The lid casing 20 has a shield portion in which the lid casing 20 is protruded in a cylindrical shape along the outer periphery of the resolver rotor member 19 from the convex portion 20a that is a portion that holds the outer periphery of the resolver stator member 23 to the resolver rotor member 19. The cylindrical portion 20b is integrally formed. Here, aluminum can be adopted as the nonmagnetic conductive material.

  Therefore, according to the motor structure with a rotation detector (resolver) of this embodiment, since the cylindrical portion 20b is projected from the convex portion 20a of the lid casing 20 to the resolver rotor member 19, as shown by an arrow in FIG. The magnetic field generated in the motor stator 12 is converted into eddy current in the cylindrical portion 20b and changed into heat. For this reason, the adverse effect of the magnetic field generated in the motor stator 12 on the resolver stator member 23 and the resolver rotor member 19 can be reduced, and the detection accuracy of the rotation angle by the resolver can be improved. Further, since the air gap 26 between the resolver rotor member 19 and the resolver stator member 23 is closed by the cylindrical portion 20b, entry of foreign matter into the air gap 26 can be prevented. As a result, disconnection or short circuit of the first resolver stator pattern 51, the second resolver stator pattern 52, the resolver rotor pattern 30, and the like can be prevented, and in that sense, the resolver reliability can be improved. Furthermore, the cylindrical portion 20b having the above function can be molded integrally with the lid casing 20 with a mold, and it is not necessary to separately provide this functional component, so that the number of components is not increased and the cost merit is increased.

[Fifth Embodiment]
Next, a fifth preferred embodiment that embodies the motor structure with a rotation detector of the present invention will be described in detail with reference to the drawings.

  FIG. 12 is a cross-sectional view showing the structure of a motor incorporating a resolver. This embodiment is different from the first embodiment in that the stopper 17 in the first embodiment is omitted and the stepped portion 13a of the motor shaft 13 is shortened. In this embodiment, a shield plate 18 as a shield member abuts and is fixed to the right end surface of the motor rotor 15, and a resolver rotor member 19 is fixed to the shield plate 18. As the shield plate 18, aluminum or the like, which is a nonmagnetic conductive material, can be used. A cylindrical portion 18 a is formed integrally with the outer peripheral edge of the shield plate 18 so as to protrude cylindrically along the outer periphery of the resolver rotor member 19 to the vicinity of the resolver stator member 23. The tip of the cylindrical portion 18a is opposed to the tip of the convex portion 20a that holds the resolver stator member 23 in the lid casing 20 via a gap.

  Therefore, according to the motor structure of this embodiment, the outer peripheral edge of the shield plate 18 made of a nonmagnetic conductive material is protruded to the vicinity of the resolver stator member 23 so that the cylindrical portion 18a is provided. The magnetic field to be converted into eddy current in the cylindrical portion 18a is changed into heat. For this reason, the bad influence of the magnetic field with respect to the resolver stator member 23 and the resolver rotor member 19 can be reduced, and the detection accuracy of the rotation angle by the resolver can be improved. Further, since the air gap 26 between the resolver rotor member 19 and the resolver stator member 23 is closed by the cylindrical portion 18a, it is possible to prevent foreign matter from entering the air gap 26. As a result, disconnection or short circuit of the first resolver stator pattern 51, the second resolver stator pattern 52, the resolver rotor pattern 30, and the like can be prevented, and in that sense, the resolver reliability can be improved. Further, the cylindrical portion 18a having the above function can be molded integrally with the shield plate 18 by a mold, and it is not necessary to separately provide this functional component, and the number of components is not increased, and cost merit is high.

[Sixth Embodiment]
Next, a most preferred sixth embodiment that embodies the motor structure with rotation detector of the present invention will be described in detail with reference to the drawings.

  FIG. 13 is a cross-sectional view showing the structure of a motor incorporating a resolver. In this embodiment, unlike the fourth embodiment, the convex portion 20a of the lid casing 20 is slightly lengthened, and a cylindrical shield member made of a nonmagnetic conductive material between the convex portion 20a and the resolver rotor member 19 is used. 27 is provided. The base end portion of the shield member 27 is fixed inside the convex portion 20 a, and the tip end portion is disposed so as to cover the outer peripheral edge of the resolver rotor member 19. Aluminum or the like can be used as the nonmagnetic conductive material.

  Therefore, according to the motor structure of this embodiment, since the cylindrical shield member 27 made of a nonmagnetic conductive material is provided from the convex portion 20a of the lid casing 20 to the outer peripheral edge of the resolver rotor member 19, the motor stator 12 The magnetic field generated by the above is converted into eddy current by the shield member 27 and changed into heat. For this reason, the bad influence of the magnetic field with respect to the resolver stator member 23 and the resolver rotor member 19 can be reduced, and the detection accuracy of the rotation angle by the resolver can be improved. In addition, since the air gap 26 between the resolver rotor member 19 and the resolver stator member 23 is closed by the cylindrical shield member 27, entry of foreign matter into the air gap 26 can be prevented. As a result, disconnection or short circuit of the first resolver stator pattern 51, the second resolver stator pattern 52, the resolver rotor pattern 30, and the like can be prevented, and in that sense, the resolver reliability can be improved. In addition, a material having a higher shielding effect than the lid casing 20 can be used for the shielding member 27, and the shielding effect of the magnetic field can be enhanced as compared with the first embodiment.

[Seventh Embodiment]
Next, a most preferred seventh embodiment that embodies the motor structure with a rotation detector of the present invention will be described in detail with reference to the drawings.

  FIG. 14 is a cross-sectional view showing the structure of a motor incorporating a resolver. In this embodiment, unlike the fifth embodiment, the tip of the cylindrical portion 18 a of the shield plate 18 is opposed to the outer periphery of the convex portion 20 a that holds the resolver stator member 23.

  Therefore, according to the motor structure of this embodiment, it is possible to obtain the same effects as those of the fifth embodiment. In addition, since the tip of the cylindrical portion 18a faces the outer periphery of the convex portion 20a, the air gap 26 between the resolver rotor member 19 and the resolver stator member 23 is closed more precisely, and the air gap 26 Intrusion of foreign matter can be prevented more effectively.

  The present invention can be applied in various ways in addition to the above embodiments. For example, in each of the above embodiments, the copper shield plate 18 is used as the shield member, but a brass shield plate may be used. Further, thick copper plating or aluminum may be used.

  In the first embodiment, the resolver rotor pattern 30 and the rotary transformer pattern 31 as the thin film pattern, the resolver stator first pattern 51, the rotary transformer pattern 57, and the resolver stator second pattern 52 are arranged in an inkjet printer (inkjet). The thin film pattern can also be formed by vapor deposition, sputtering, plating, or etching.

  In the fourth embodiment, the lid casing 20 and the cylindrical portion 20b are formed of a nonmagnetic conductive material such as aluminum. However, the lid casing 20 and the cylindrical portion 20b may be formed of a magnetic material such as iron. Good.

  In the fifth and seventh embodiments, the shield plate 18 and the cylindrical portion 18a are made of a nonmagnetic conductive material such as aluminum. However, the shield plate 18 and the cylindrical portion 18a are made of a magnetic material such as iron. It may be formed.

  In the sixth embodiment, the shield member 27 is formed of a nonmagnetic conductive material such as aluminum. However, the shield member may be formed of a magnetic material such as iron.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can implement as follows.

  The present invention can be used, for example, in a motor of a hybrid vehicle or an electric vehicle.

11 motor casing 12 motor stator 13 motor shaft 15 motor rotor 18 shield plate 18a cylindrical part 19 resolver rotor member 20 lid casing 20a convex part 20b cylindrical part 21 bearing 23 resolver stator member 27 shield member 30 resolver rotor pattern 31 rotary transformer pattern 51 resolver Stator first pattern 52 Resolver stator second pattern 57 Rotary transformer pattern

Claims (14)

A casing,
A stator provided in the casing;
A bearing provided in the casing;
A rotating shaft rotatably supported by the casing via the bearing;
A rotor provided to be rotatable integrally with the rotating shaft;
In the motor structure with a rotation detector comprising a rotation detector for detecting the rotation angle of the rotor,
The rotation detector is
A disc-shaped resolver stator member held by the casing and having a thin-film coil formed on the surface;
A disc-shaped resolver rotor member provided on an end face of the rotor, and having a thin-film coil formed on the surface ;
A shield member provided between the rotor and the resolver rotor member;
The resolver rotor member is attached to an end surface of the rotor via the shield member;
The motor structure with a rotation detector, wherein the shield member includes a non-magnetic conductive material .   The motor structure with a rotation detector according to claim 1, wherein the thin-film coil formed on the resolver rotor member is formed as a thin film pattern on the surface of the resolver rotor member by an ink jet printer. .   3. The thin film pattern is fixed to the resolver rotor member by applying an ink liquid in which silver particles are dispersed in a dispersant with the ink jet printer and then baking the ink liquid. The motor structure with a rotation detector as described. The motor structure with a rotation detector according to any one of claims 1 to 3, wherein the shield member is a copper plate or copper plating. The motor structure with a rotation detector according to any one of claims 1 to 4 , wherein the resolver stator member and the bearing are positioned with respect to the casing. The part of the casing that holds the outer periphery of the resolver stator member protrudes in a cylindrical shape along the outer periphery of the resolver rotor member up to the resolver rotor member to form a shield portion. The motor structure with a rotation detector according to any one of 5 . The motor structure with a rotation detector according to claim 6 , wherein the casing and the shield portion are formed of a nonmagnetic conductive material. The motor structure with a rotation detector according to claim 6 , wherein the casing and the shield portion are formed of a magnetic material. According to any one of claims 1 to 5, characterized in that the cylindrical shield member between the part to the resolver rotor member of the casing for holding the outer periphery of the resolver stator members are provided Motor structure with rotation detector. The motor structure with a rotation detector according to claim 9 , wherein the shield member is made of a nonmagnetic conductive material. The motor structure with a rotation detector according to claim 9 , wherein the shield member is made of a magnetic material. The outer peripheral edge of the shield member provided between the rotor and the resolver rotor member is projected in a cylindrical shape along the outer periphery of the resolver rotor member to the vicinity of the resolver stator member. Item 2. A motor structure with a rotation detector according to item 1 . The motor structure with a rotation detector according to claim 12 , wherein the shield member is formed of a nonmagnetic conductive material. The motor structure with a rotation detector according to claim 12 , wherein the shield member is made of a magnetic material.

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