Stator of resolver

Abstract

The present invention effectively shields magnetic flux generated by a rotating electrical machine and reduces magnetic flux interlinked with a stator winding. A stator (100) for a resolver (1) is provided with: a stator core (110) provided with a core back section (111) and teeth (112) extending radially inward from the periphery of the core back section (111); an insulator (120) provided on the stator core (110); a stator winding (130) wound around the teeth (112) via an insulator (120); and an annular shield (160) covering the motor side of the stator core (110). The insulator (160) includes a winding portion attached to the teeth (112) and a flange portion (125) extending radially outward from the winding portion, the shield (160) includes a first annular portion (161) covering the core back portion (111) and a second annular portion (164) covering the stator winding (130), and the flange portion (125) is interposed between the core back portion (111) and the first annular portion (161).

Description

Technical Field

[0001] The present invention relates to a stator of a rotary transformer, and in particular to a stator of a rotary transformer having a shielding member. Background Art

[0002] Conventionally, a rotary transformer is known as a device for detecting the rotation angle of a rotary electric machine such as a motor or a generator. Due to the change in the current supplied to the winding of the rotary electric machine to which the rotary transformer is applied, a part of the magnetic flux generated by the rotary electric machine is superimposed on the signal flowing through the winding wound on the stator of the rotary transformer, which may cause the waveform of the signal to be disordered and thus make it impossible to accurately detect the rotation angle of the rotary electric machine. Therefore, a stator of a rotary transformer having a shielding member in order to suppress the influence of the magnetic flux from the rotary electric machine is known (for example, refer to Patent Document 1).

[0003] like Fig.10 As shown, the stator of the rotary transformer of patent document 1 includes an electromagnetic shielding member 8, which has an annular shielding member body covering the stator winding 10 wound on a plurality of teeth 13, and the stator core 9 has a core fastening portion 15, which has a core fastening hole 15a as a bolt fastening hole, and the electromagnetic shielding member 8 has a shielding member fastening portion 21, which has a shielding member fastening hole 21a connected to the core fastening hole 15a.

[0004] In such a structure, the following structure is adopted: the bolts are inserted into the core fastening holes 15a and the shield fastening holes 21a, and the core fastening parts 15 and the shield fastening parts 21 are fastened to the housing at the same time. In this case, a micro hole 40 is formed in each core fastening part 15 of the stator core 9, and a part of the shield fastening part 21 of the electromagnetic shield 8 is pressed into the micro hole 40 for riveting. As a result, the efficiency of the collective fastening work can be greatly improved.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2014-107977 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, in the above structure, since the stator core 9 is in contact with the electromagnetic shielding member 8, the magnetic flux generated by the rotating electric machine may interlink with the stator winding 10 from the electromagnetic shielding member 8 via the stator core 9. In addition, since the stator core 9 and the electromagnetic shielding member 8 overlap in the axial direction, the side surface of the stator core 9 is exposed. Therefore, the magnetic flux generated by the rotating electric machine may enter from the side surface of the stator core 9 and interlink with the stator winding 10.

[0010] The present invention has been made in view of the above circumstances, and one object of the present invention is to provide a stator of a rotary transformer that can effectively shield magnetic flux generated by a rotary electric machine and reduce magnetic flux interlinked with a stator winding.

[0011] Solutions for solving problems

[0012] The present invention is a stator of a rotating transformer, comprising: a stator core, comprising an annular main body and a plurality of teeth extending radially inward from the periphery of the main body; an insulator provided on the stator core; a stator winding wound around the plurality of teeth via the insulator; a plurality of terminal pins for connecting the ends of the stator winding; a terminal platform portion for holding the plurality of terminal pins; and an annular shielding member covering the rotating motor side of the stator core, wherein the insulator comprises a winding portion attached to the teeth and a flange portion extending radially outward from the winding portion, the shielding member comprises a first annular portion covering the main body of the stator core and a second annular portion covering the stator winding wound around the teeth, and the flange portion of the insulator is interposed between the main body of the stator core and the first annular portion of the shielding member. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view showing a resolver according to an embodiment of the present invention.

[0014] Figure 2 It is an exploded perspective view showing a stator of a resolver according to the embodiment.

[0015] Figure 3 This is an exploded perspective view of a stator of a resolver according to an embodiment when viewed from below.

[0016] Figure 4 It is a plan view showing a stator of a resolver according to the embodiment.

[0017] Figure 5 It is a side view showing a stator of a resolver according to the embodiment.

[0018] Figure 6 It is a rear view showing the stator of the resolver according to the embodiment.

[0019] Figure 7This is a perspective view of a stator of a resolver according to the embodiment as seen from below.

[0020] Figure 8 It is a cross-sectional view of a portion including bolts of a stator of a resolver according to an embodiment.

[0021] Fig. 9 It is a cross-sectional view of a portion including a coupling pin of a stator of a resolver according to an embodiment.

[0022] Fig.10 This is an exploded perspective view showing a stator of a resolver described in Patent Document 1. DETAILED DESCRIPTION

[0023] 1. The overall structure of the rotary transformer

[0024] Figure 1 A rotary transformer 1 according to an embodiment of the present invention is shown in the figure. The rotary transformer 1 is a VR (variable reluctance) type rotary transformer. The rotary transformer 1 has a rotor 10 and a stator 100. The rotor 10 is fixed to the output shaft of a motor (not shown). When viewed from the axial direction, the rotor 10 has a non-circular shape having a plurality of protrusions 11 protruding radially outward. The rotor 10 has a structure in which a plurality of thin plate-shaped rotor cores are stacked in the axial direction. It should be noted that, in the following description, the direction of the output shaft is referred to as the "axial direction", and the direction orthogonal to the axial direction is referred to as the "radial direction". In addition, the terms "upper" and "lower" represent Figure 2 Up and down direction.

[0025] The thin plate-shaped rotor core constituting the rotor 10 is produced by punching a plate made of an electromagnetic steel sheet into the shape shown in the figure. The rotor 10 is formed by stacking a plurality of rotor cores in the axial direction and fixing them by caulking.

[0026] The stator 100 is arranged outside the rotor 10 and fixed to the housing 20. A gap is provided between the rotor 10 and the stator 100, so that the rotor 10 can rotate inside the stator 100. The housing 20 is a component to which the stator 100 of the rotary transformer 1 is mounted, and is provided with a threaded hole (not shown) for fixing the stator 100 of the rotary transformer 1. The stator 100 of the rotary transformer 1 is mounted on the housing 20 by screwing the bolt 30 into the threaded hole. It should be noted that Figure 1 There is only one bolt 30 in the housing 20 , but the housing 20 is assembled with a plurality of bolts 30 .

[0027] like Figure 2 and Figure 3As shown, the stator 100 has a stator core 110. The stator core 110 has a structure formed by stacking a plurality of thin plate-shaped cores in the axial direction. The thin plate-shaped core has an annular core back (main body) 111, a plurality of teeth 112 protruding radially inward from the core back 111, and a plurality of flanges 113 protruding radially outward from the core back 111. In the flange 113, through holes (insertion portions) 113a for inserting bolts 30 are formed on concentric circles along the circumferential direction. The core is made by stamping a plate made of electromagnetic steel sheets. The stator core 110 is obtained by stacking a plurality of the cores in the axial direction and fixing them by riveting. The diameter of the through hole 113a has such a size that when the bolt 30 is inserted into the through hole 113a, the bolt 30 does not contact the stator core 110.

[0028] Insulators 120 are fixed to both axial sides of the stator core 110. The insulators 120 are made of insulating resin and are injection molded with the stator core 110 as an insert. Figure 8 and Fig. 9 As shown, the insulator 120 includes a winding portion 121 fixed to each tooth 112 and a flange portion 125 extending radially outward from the winding portion 121 .

[0029] The winding portion 121 is formed to surround the entire circumference of the teeth 112, and includes a body portion 122 in the radial center, an inner limiting portion 123 extending in the axial direction and the circumferential direction on the inner circumference of the body portion 122, and an outer limiting portion 124 erected in the axial direction on the outer circumference of the body portion 122. The stator winding 130 is wound around the body portion 122, and the inner limiting portion 123 and the outer limiting portion 124 limit the range of the winding wire so that the stator winding 130 does not collapse.

[0030] A plurality of protrusions 126 protruding radially outward are formed at equal intervals in the circumferential direction on the flange portion 125 of the insulator 120. The protrusions 126 are formed to have substantially the same shape and size as the flange 113 of the stator core 110, and are arranged to overlap with the flange 113 of the stator core 110. The protrusions 126 are formed with through holes 126a overlapping with the through holes 113a of the flange 113.

[0031] like Figure 2 As shown, a terminal base 140 is integrally formed on the insulator 120, and a plurality of terminal pins 141 are embedded in the terminal base 140 by insert molding. In addition, a connector housing 142 is integrally formed on the axial lower side of the terminal base 140. The terminal pin 141 is crank-shaped in the axial direction, one end of which protrudes from the terminal base 140, and the other end protrudes from the connector housing 142. The winding end 131 of the stator winding 130 is wound and connected to one end of the terminal pin 141.

[0032] like Figure 3 As shown, an annular protrusion 127 protruding axially downward is formed on the insulator 120. The annular protrusion 127 extends annularly along the core back portion 111, and its end is connected to the terminal base portion 140. The annular protrusion 127 is in close contact with the inner peripheral surface of the hole formed in the housing 20.

[0033] A terminal pin cover 150 is attached to the terminal stage 140. The terminal pin cover 150 is composed of a rectangular top plate 151, side plates 152 extending axially from three sides of the top plate 151, and a pair of arm portions 153 extending axially from lower edges of the mutually opposed side plates 152. Claws 154 are formed at the lower ends of the pair of arm portions 153 and protrude toward each other.

[0034] On the other hand, a plurality of protrusions 143 protruding axially upward are formed along one side of the upper surface of the terminal base 140, and the inner peripheral surface of the side plate 152 of the terminal pin cover 150 is in close contact with the radially outer surface of the protrusion 143. In addition, grooves 144 are formed on both sides of the terminal base 140, and a step portion 145 that is recessed one section is formed at the lower end of the groove 144. Based on such a structure, when the arm portion 153 of the terminal pin cover 150 is inserted into the groove 144 and pressed down, the claw portion 154 is engaged with the step portion 145, and the terminal pin cover 150 is attached to the terminal base 140.

[0035] like Figure 3 As shown, a plurality of partition plates 155 extending in the radial direction are formed on the back of the top plate portion 151 of the terminal pin cover 150. When the terminal pin cover 150 is attached to the terminal stage portion 140, the partition plates 155 are inserted between the terminal pins 141 to prevent the winding ends 131 of the stator winding 130 wound around one end of the terminal pins 141 from contacting each other.

[0036] A plurality of coupling pins 128 protruding axially upward are formed on the flange portion 125 of the insulator 120 so as to be located in the middle of the through hole 126 a . The shield 160 is coupled to the insulator 120 using the coupling pins 128 .

[0037] The shielding member 160 is an annular member made of a metal material (such as a cold-rolled steel plate). Figure 2As shown, the shield 160 has a first annular portion 161 on its outer circumferential side. A cylindrical portion 162 extending axially downward is formed at the edge of the first annular portion 161. The axial length of the cylindrical portion 162 is set to be the same as the length obtained by adding the thickness of the flange portion 125 of the insulator 120 to the axial length of the stator core 110, but it can also be larger than this size. Therefore, when the stator 100 is attached to the housing 20, the edge of the cylindrical portion 162 is in close contact with the surface of the housing 20. A second annular portion 164 is formed on the inner circumferential side of the first annular portion 161 via the connecting portion 163.

[0038] The second annular portion 164 is located axially upward relative to the first annular portion 161, and the connecting portion 163 connecting the two is set as an inclined surface inclined upward. A terminal block cover 166 extending radially outward is formed on one side of the connecting portion 163. The surface of the terminal block cover 166 and the surface of the second annular portion 164 are set to be on the same plane. A circular opening 165 is formed in the center of the second annular portion 164.

[0039] The first annular portion 161 has a plurality of circular first through holes 167 formed concentrically along the circumferential direction. The first through holes 167 are arranged at positions corresponding to the through holes 113a formed in the flange 113 of the stator core 110 and the through holes 126a formed in the protrusion 126 of the insulator 120. In addition, the first annular portion 161 has a plurality of circular second through holes 168 formed concentrically along the circumferential direction. The second through holes 168 are arranged at positions corresponding to the coupling pins 128 formed in the flange portion 125 of the insulator 120.

[0040] 2. Assembly method of rotary transformer

[0041] The plurality of coupling pins 128 formed on the flange portion 125 of the insulator 120 are respectively inserted into the second through holes 168 formed on the first annular portion 161 of the shield 160, and the top ends of the coupling pins 128 protruding from the second through holes 168 are plastically deformed (thermal caulking) by heat, thereby coupling the shield 160 to the stator core 100 (see Fig. 9 The deformed tip of the coupling pin 128 is disposed below the second annular portion 164 of the shield portion 160 and does not protrude from the second annular portion 164 in the axial direction.

[0042] At this time, second annular portion 164 of shield 160 is located above stator winding 130 , a predetermined gap is formed between stator winding 130 and second annular portion 164 (the back side of second annular portion 164 ), and shield 160 does not contact stator winding 130 .

[0043] The first annular portion 161 of the shield 160 is placed on the flange portion 125 of the insulator 120 . Thus, the flange portion 125 is disposed between the core back portion 111 of the stator core 110 and the first annular portion 161 of the shield 160 , so that the shield 160 does not contact the stator core 110 .

[0044] The second annular portion 164 of the shield 160 covers the stator winding 130, the first annular portion 161 of the shield 160 covers the core back portion 111 of the stator core 110, the terminal stage cover 166 of the shield 160 covers the terminal stage 140, and the cylindrical portion 162 of the shield 160 surrounds the entire circumference of the side surface of the stator core 110. Figure 6 As shown, the side surface of the stator core 110 and the inner peripheral surface of the cylindrical portion 162 of the shield 160 have a predetermined gap in the radial direction so as not to contact each other.

[0045] The stator 100 to which the shielding member 160 is attached is assembled to the housing 20 using metal bolts 30. In this case, Figure 8 As shown, the washer 31 can be interposed between the shield 160 and the bolt 30. The bolt 30 is inserted into the first through hole 167 formed in the first annular portion 161 of the shield 160 and the through hole 113a formed in the flange 113 of the stator core 110, and the bolt 30 is screwed into the threaded hole of the housing 20.

[0046] When the motor rotates, magnetic flux is generated, and the magnetic flux toward the stator winding 130 is absorbed by the shield 160. In the stator 100 of the rotary transformer of the above structure, the flange portion 125 of the insulating resin of the insulator 120 is interposed between the core back portion 111 of the stator core 110 and the first annular portion 161 of the shield 160, so that the magnetic flux absorbed by the shield 160 can be suppressed from interlinking with the stator winding 130 via the core back portion 111. In addition, since such an effect can be obtained by using the flange portion 125 as a part of the insulator 120, an increase in manufacturing cost can be avoided.

[0047] The bolt 30 acts as an antenna to absorb the magnetic flux generated by the motor, and the magnetic flux flows to the shield 160. In this regard, in the above-mentioned embodiment, the flange portion 125 of the resin having insulating properties is present at the peripheral portion of the first through hole 167 of the shield 160 through which the bolt 30 is inserted, thereby preventing the magnetic flux from flowing to the core back portion 111. In addition, when the bolt 30 is inserted into the through hole 113a of the stator core 110, since the bolt 30 and the stator core 100 have a predetermined gap in the radial direction so as not to contact each other, the magnetic flux can be prevented from flowing to the core back portion 111.

[0048] In the above-described stator 100 , the cylindrical portion 162 of the shield 160 covers the periphery of the core back portion 111 , and thus can shield the magnetic flux that attempts to enter from the periphery of the core back portion 111 .

[0049] In the above-described stator 100 , the second annular portion 164 of the shield 160 is spaced apart axially upward from the stator winding 130 , so that the magnetic flux absorbed by the shield 164 is prevented from interlinking with the stator winding 130 .

[0050] In the above-described stator 100 , the shield 160 includes the terminal base cover 166 that covers the terminal base 140 , and thus it is possible to suppress the influence of the magnetic flux generated by the motor on the winding end 131 .

[0051] In the above embodiment, the insulator 120 is integrally formed with the stator core 110 as an insert, so when the coupling pin 128 of the insulator 120 is inserted into the second through hole 168 of the shielding member 160 and thermally riveted, the stator core 110 is also coupled to the insulator 120, thereby improving workability.

[0052] 3. Change Examples

[0053] The present invention is not limited to the above-described embodiment, and various modifications are possible as follows.

[0054] i) The through hole 113 a formed in the flange 113 of the stator core 110 and the through hole 126 a formed in the protrusion 126 of the insulator 120 may be a notch opened toward the radially outer side.

[0055] ii) In the above embodiment, the connector housing 142 is provided for insertion of the socket, but a structure in which a known lead wire is connected to the terminal pin 141 may be adopted.

[0056] Industrial Applicability

[0057] The present invention can be used for a resolver for detecting the rotation angle of a rotating electrical machine such as a motor.

[0058] Description of Reference Numerals

[0059] 1: rotary transformer; 10: rotor; 11: protrusion; 20: housing; 30: bolt; 31: washer; 100: stator; 110: stator core; 111: core back (main body); 112: tooth; 113: flange; 113a: through hole (insertion part); 120: insulator; 121: winding part; 122: trunk; 123: inner limiting part; 124: outer limiting part; 125: flange; 126: protrusion; 126a: through hole; 127: annular protrusion; 128: coupling pin; 130: stator winding ; 131: winding end; 140: terminal block; 141: terminal pin; 142: connector housing; 143: convex portion; 144: groove; 145: step portion; 150: terminal pin cover; 151: top plate portion; 152: side plate portion; 153: arm portion; 154: claw portion; 155: partition plate; 160: shielding member; 161: first annular portion; 162: cylindrical portion; 163: connecting portion; 164: second annular portion; 165: opening; 166: terminal block cover; 167: first through hole; 168: second through hole.

Claims

1. A stator of a rotary transformer, comprising: The stator core includes an annular main body and a plurality of teeth extending radially inward from a peripheral edge of the main body; An insulator, arranged on the stator core; a stator winding wound around the plurality of teeth via the insulator; A plurality of terminal pins for connecting the ends of the stator winding; a terminal block portion that holds the plurality of terminal pins; and An annular shield covers the rotating electrical machine side of the stator core, wherein: The insulator includes a winding portion attached to the teeth and a flange portion extending radially outward from the winding portion. The shield includes a first annular portion covering the main body of the stator core and a second annular portion covering the stator winding wound around the teeth. The flange portion of the insulator is interposed between the main body portion of the stator core and the first annular portion of the shield.

2. The stator of the rotary transformer according to claim 1, wherein: The main body of the stator core includes a plurality of insertion portions through which bolts are inserted. The first annular portion of the shield includes a plurality of first through holes through which the bolts are inserted, and the flange portion is interposed at peripheral edge portions of the first through holes.

3. The stator of the rotary transformer according to claim 1 or 2, wherein: The shield includes a cylindrical portion extending in the axial direction from a peripheral edge of the first annular portion and covering a side surface of the main body portion of the stator core.

4. The stator of the rotary transformer according to claim 3, wherein: The cylindrical portion surrounds the entire circumference of the side surface of the stator core.

5. The stator of the rotary transformer according to claim 4, wherein: The edge of the cylindrical portion is in close contact with the surface of a housing to which the stator is attached.

6. The stator of a rotary transformer according to any one of claims 1 to 5, wherein: The flange portion of the insulator includes a plurality of coupling pins protruding in the axial direction, the first annular portion of the shield includes a plurality of second through holes for the coupling pins to pass through, and the shield plastically deforms the coupling pins protruding from the second through holes to couple with the stator core.

7. The stator of a rotary transformer according to any one of claims 1 to 6, wherein: The insulator is integrally formed with the stator core as an embedded component.

8. The stator of a rotary transformer according to any one of claims 1 to 7, wherein: The shield includes a terminal base cover that covers the terminal base.

9. The stator of the rotary transformer according to claim 8, wherein: A terminal pin cover is attached to the terminal stage portion, and the terminal stage portion cover covers the terminal pin cover.

10. The stator of the rotary transformer according to claim 8 or 9, wherein: The surface of the terminal base cover is flatly continuous with the surface of the second annular portion.

11. The stator of a rotary transformer according to any one of claims 2 to 10, wherein: The main body of the stator core includes a plurality of flanges protruding radially outward, and the flanges include the insertion portions.

12. The stator of a rotary transformer according to any one of claims 2 to 11, wherein: The insertion portion is a through hole or a notch.

13. The stator of a rotary transformer according to any one of claims 1 to 12, wherein: The second annular portion of the shield is located farther from the stator core in the axial direction than the first annular portion.

14. A rotary transformer, wherein: A rotor connected to an output shaft of the rotary electric machine is arranged inside a stator of the rotary transformer according to any one of claims 1 to 13 .

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