Resolver sensor fixing structure

Abstract

To provide means for simply and easily mounting a resolver stator on a motor, instead of fixing the resolver stator to the motor with a triangle claw.SOLUTION: A resolver sensor fixing structure includes a motor stator 70 that is held by a front lid 106 and a rear lid 101 provided on both ends of a motor case 30, a rotor shaft 20 that is rotatable with a first bearing 2 provided on the front lid 106 and a second bearing 3 provided on the rear lid 101, a resolver rotor 22 that is disposed on an end 201 of the rotor shaft 20, a bearing house 102 that is disposed on the rear lid 101 and is in contact with an outer ring 3b of the second bearing 3, a resolver stator 90 that is positioned above the bearing house 102 and outside the resolver rotor 22, a sensor cover 100 that is disposed above the rear lid 101, and a circumferential wall 100a of the sensor cover 100 and an end surface 102a of the bearing house 102. The resolver stator 90 is located between the circumferential wall 100a and the end surface 102a, and further, is pinched between the circumferential wall 100a and the end surface 102a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fixing structure for a resolver sensor, and more particularly to a new improvement that simplifies circumferential and axial fixing and positioning of a resolver by attaching a resolver rotor to a rotary shaft of a motor with respect to a resolver stator provided on the end side of the rotary shaft, and positioning and sandwiching the resolver stator between the peripheral wall of a sensor cover and the end face of a bearing house. [Background technology]

[0002] Although the conventional structure of this type of motor having a resolver at one end is not disclosed in any patent documents or the like, it can be shown in Figures 10, 11 and 12 as a configuration manufactured in-house by the applicant. The resolver sensor 91 shown in FIG. 10 is provided on the rear cover 101 of the motor case 30 of the motor 105. A sensor cover 100 of the resolver sensor 91 of the motor 105 is formed with a plurality of screw holes 6 .

[0003] A bolt 300 is threaded into each of the screw holes 6, and a triangular claw 8 is held on each bolt 300 so as to be rotatable around the bolt 300. When the triangular claw 8 is rotated so that it overlaps and engages with the flange 91a of the resolver sensor 91 in a plan view, the resolver sensor 91 is fixed to the motor 105 by tightening the bolt 300.

[0004] Next, in the exploded oblique view of Figure 10 mentioned above, when the triangular claw 8 of the sensor cover 100 provided on the rear cover 101 is rotated, the triangular claw 8 engages with the flange 91a, and the resolver sensor 91 is fixed to the sensor cover 100.

[0005] Furthermore, as a fixing structure for this type of bearing used to connect a resolver to a motor, for example, the configuration disclosed in Patent Document 1 can be shown in FIGS. 13 and 14. That is, what is shown by the reference numeral 91 in FIG. 13 is a cylindrical case having a motor stator coil 200, and a front cover 106 and a rear cover 101 are provided on both ends of the cylindrical case 91. The front cover 106 is provided with a first bearing 2 having an inner ring 2a and an outer ring 2b and a bearing retainer 2A, and the rear cover 101 is provided with a second bearing 3 having an inner ring 3a and an outer ring 3b and a bearing nut 10.

[0006] A wave washer 11 is provided inside the bearing nut 10, and a rotating shaft 20 is provided between the bearings 2 and 3 so as to be freely rotatable.

[0007] FIG. 14 is an enlarged cross-sectional view of a main part of FIG. 13, and the outer ring 3b is biased in the axial direction P by the wave washer 11. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Publicly-available Practical Application Publication No. Heisei 2-88444 Summary of the Invention [Problem to be solved by the invention]

[0009] Conventional bearing fixing structures have been configured as described above, and have therefore had the following problems: First, in the case of the first conventional configuration shown in Figures 10 to 12, triangular claws 8 and screws 7 must be used to finally fix the resolver sensor 1 to one end 1A of the motor 2, which is extremely unsettling in terms of mechanical stability. Furthermore, in the second conventional configuration shown in Figures 13 and 14, only the outer ring 3b of the second bearing 3 is pressed from the outside by the wave washer 11. Therefore, if, for example, a large vibration is applied, the pressing force of the wave washer 11 alone is not enough to press down on the second bearing 3, and there is a risk that the bearing may come off or be damaged. [Means for solving the problem]

[0010] The resolver sensor fixing structure according to the present invention comprises a motor stator held by a front cover and a rear cover provided at both ends of a motor case, a rotating shaft rotatably provided by a first bearing provided on the front cover and a second bearing provided on the rear cover, a resolver rotor provided at an end of the rotating shaft, a bearing house provided on the rear cover and in contact with an outer ring of the second bearing, a resolver stator located above the bearing house and outside the resolver rotor, a sensor cover provided on the top of the rear cover, a peripheral wall of the sensor cover and an end face of the bearing house, The resolver stator is positioned between the peripheral wall and the end face and is sandwiched between the peripheral wall and the end face. The bearing house, which is made of iron, is integrated with the rear cover, which is made of aluminum, by any one of casting, press fitting, shrink fitting, caulking, welding, and bonding. The resolver stator has one or more grooves formed on the outer periphery and one or more protrusions provided on the bearing house. The resolver stator and the bearing house are integrated by fitting the grooves and the protrusions together. [Effects of the Invention]

[0011] The resolver sensor fixing structure according to the present invention is configured as described above, and therefore has the following advantages. Specifically, the motor case includes a motor stator held by a front cover and a rear cover attached to both ends of the motor case; a rotating shaft rotatably mounted by a first bearing attached to the front cover and a second bearing attached to the rear cover; a resolver rotor attached to the end of the rotating shaft; a bearing house attached to the rear cover and in contact with the outer ring of the second bearing; a resolver stator located above the bearing house and outside the resolver rotor; a sensor cover attached to the top of the rear cover; a peripheral wall of the sensor cover and an end face of the bearing house; and the resolver stator positioned between and sandwiched between the peripheral wall and the end face. This configuration facilitates circumferential and axial fixation and positioning of the resolver. This allows for zero-point positioning of the sensor and motor and minimizes axial misalignment. Compared to fixing methods using screws, this method simplifies the structure and reduces the number of manufacturing steps. Furthermore, the bearing house used here can prevent the resolver from being affected by external magnetic noise and other factors. Furthermore, by integrating the iron bearing house with the aluminum rear cover by any one of casting, press fitting, shrink fitting, caulking, welding, and bonding, the rigidity of the bearing house can be increased, and the reliability of the resolver motor can be improved. Furthermore, the resolver stator has one or more grooves formed on the outer periphery thereof, and one or more protrusions provided on the bearing house. By fitting the grooves into the protrusions, the resolver stator and the bearing house are formed as a single unit. Since the grooves and the protrusions are assembled by directly fitting them together, the rigidity of the bearing house and the resolver as a whole is improved, and the detection accuracy of the motor and the resolver can be obtained. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional view showing the configuration of a resolver sensor fixing structure according to an embodiment of the present invention after assembly; [Figure 2] FIG. 2 is an exploded perspective view of the embodiment of FIG. 1. [Figure 3] 3 is an exploded perspective view showing a state in which the assembled resolver of FIG. 2 is inserted into a motor stator of a motor. FIG. [Figure 4] FIG. 4 is a perspective view showing a state when the motor and resolver in FIG. 3 are assembled. [Figure 5] FIG. 5 is a plan view showing the resolver motor of FIG. 4 after final assembly. [Figure 6] FIG. 2 is an enlarged perspective view showing a main part of FIG. 1. [Figure 7] 6 is a cross-sectional view of a main part of FIG. 1 to facilitate understanding of FIG. [Figure 8] FIG. 2 is an exploded perspective view showing the overall configuration of FIG. 1. [Figure 9] FIG. 9 is a perspective view showing a state in which the sensor cover of FIG. 8 is attached. [Figure 10] FIG. 10 is an exploded perspective view showing a first conventional configuration during assembly. [Figure 11] FIG. 11 is a perspective view of the assembled state of FIG. [Figure 12] FIG. 12 is a plan view of FIG. [Figure 13] FIG. 10 is a cross-sectional view showing a second conventional configuration. [Figure 14] FIG. 14 is an enlarged cross-sectional view of a main part of FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0013] The resolver sensor fixing structure according to the present invention has a resolver rotor attached to a rotating shaft with respect to a resolver stator provided on the end side of a motor, and the resolver stator is positioned and clamped between the peripheral wall of the sensor cover and the end face of the bearing house, thereby easily fixing the resolver in the circumferential direction, fixing it in the axial direction, and positioning it. [Example]

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a resolver sensor fixing structure according to the present invention will now be described with reference to the drawings. In addition, parts that are the same as or equivalent to those in the conventional example will be described using the same reference numerals. In the assembled state of the resolver motor in Figure 1, what is indicated by the symbol 20 is a rotating shaft, and this rotating shaft 20 is mainly rotatably held by a first bearing 2 having an inner ring 2a and an outer ring 2b, a second bearing 3 having an inner ring 3a and an outer ring 3b, and a resolver rotor 22.

[0015] A motor stator 70 having a stator winding 200 is attached to the motor case 30 at the center of the rotating shaft 20 .

[0016] A motor rotor 104 is fixed to the rotating shaft 20 at a position corresponding to the motor stator 70 between the first bearing 2 and the second bearing 3, and the rotating shaft 20, motor rotor 104, motor stator 70, and motor case 30 form a motor 105.

[0017] A rear cover 101 is provided on the second bearing 3 side of the motor case 30 having a front cover 106 as viewed in Figure 1, and the front cover 106, motor case 30 and rear cover 101 are integrally formed by fastening screws 107. A bearing house 102 having a step 102c is provided on the outer periphery of the second bearing 3 via a bearing retainer 103, and the bearing house 102 is made of iron. The bearing house 102 made of iron is cast into the rear cover 101 made of aluminum and is integrated with the rear cover 101 by any one of press fitting, caulking, welding, and bonding. Furthermore, since the bearing house 102 is made of metal, it is possible to prevent external magnetic noise from entering the resolver sensor 91 .

[0018] The resolver rotor 22 of the resolver sensor 91 (a combination of the resolver stator 90 and the resolver rotor 22) is fixed to the end 201 of the rotating shaft 20, and the resolver stator 90 is fixed to the inner surface 101a of the rear cover 101 at a position corresponding to the resolver rotor 22, so that the resolver stator 90 and the resolver rotor 22 form the resolver sensor 91.

[0019] Next, a characteristic structure of the present invention will be described: The resolver stator 90 and the bearing house 102 are integrally joined by the structure shown in FIGS. That is, a plurality of protrusions 210 extending along the axial direction P are formed on the end face 102a of the bearing house 102, and a recessed groove 90c is formed on the outer periphery 90a of the resolver stator 90, into which the protrusions 210 can engage or fit.

[0020] The inner ring 3a of the second bearing 3 is positioned on a step 20B formed on the outer periphery 20A of the rotating shaft 20, and the outer ring 3b of the second bearing 3 is held down by a bearing retainer 103 provided at the outer periphery position of the rotating shaft 20, and the bearing retainer 103 is fitted into and fixed to the inner surface 102b of the bearing house 102. The resolver stator 90 is sandwiched between a peripheral wall 100 a of a sensor cover 100 that is attached to the rear cover 101 via bolts 300 and an end surface 102 a of the bearing house 102 . That is, the fixing structure of the resolver sensor according to this embodiment includes a motor stator 70 held by a front cover 106 and a rear cover 101 provided at both ends of a motor case 30, a rotating shaft 20 rotatably provided by a first bearing 2 provided on the front cover 106 and a second bearing 3 provided on the rear cover 101, a resolver rotor 22 provided on an end 201 of the rotating shaft 20, a bearing house 102 provided on the rear cover 101 and in contact with an outer ring 3b of the second bearing 3, The resolver stator 90 is characterized by being provided with a resolver stator 90 located above the bearing house 102 and outside the resolver rotor 22, a sensor cover 100 provided on the upper part of the rear cover 101, a peripheral wall 100a of the sensor cover 100, and an end face 102a of the bearing house 102, and the resolver stator 90 is located between the peripheral wall 100a and the end face 102a and is sandwiched between the peripheral wall 100a and the end face 102a.

[0021] 2 is an exploded view of the fixing structure of the resolver sensor in FIG. 1, FIG. 3 is a perspective view showing the resolver sensor 91 assembled to the bearing house 102, FIG. 4 is a diagram of the completed assembly, and FIG. 5 is a plan view of FIG.

[0022] FIG. 8 is a diagram showing the state immediately before the sensor cover 100 is provided on the resolver motor 91A, and FIG. 9 is a diagram showing the state after the sensor cover 100 has been provided on the resolver motor 91A.

[0023] 9 shows a state in which the sensor cover 100 of FIG. 8 is finally attached to the resolver motor 91A and fastened with a plurality of bolts 300. Note that a conducting wire (lead wire) 80 is led out from the resolver sensor 91 to the outside. [Industrial Applicability]

[0024] The resolver sensor fixing structure according to the present invention has a resolver stator provided on the end side of the rotating shaft of the motor, a resolver rotor attached to the rotating shaft, and the resolver stator positioned and clamped between the peripheral wall of the sensor cover and the end face of the bearing house, thereby easily fixing the resolver in the circumferential direction, fixing it in the axial direction, and positioning it. [Explanation of symbols]

[0025] 2. First bearing 2a Inner circle 2b outer ring 3 Second bearing 3a Inner circle 3b Outer ring 20 Rotation axis 20A outer circumference 20B Stepped section 22 Resolver rotor 30 Motor case 70 Motor stator 80 Conductor (lead wire) 90 Resolver stator 90a outer circumference 90c concave groove 91 Resolver sensor 91A resolver motor 100 Sensor cover 100a Peripheral wall 101 Rear lid 101a Inside 102 Bearing House 102a End face 102b Inside 102c Stepped section 103 Bearing holder 104 Motor rotor 105 Motor 106 Front lid 107 Fastening screws 200 stator winding 201 End 210 protrusion 300 volts P axis direction

Claims

1. the motor stator (70) is held by a front cover (106) and a rear cover (101) provided at both ends of the motor case (30); a rotating shaft (20) rotatably provided by a first bearing (2) provided on the front cover (106) and a second bearing (3) provided on the rear cover (101); a resolver rotor (22) provided on an end (201) of the rotating shaft (20); a bearing house (102) provided on the rear cover (101) and in contact with an outer ring (3b) of the second bearing (3); a resolver stator (90) located above the bearing house (102) and outside the resolver rotor (22); a sensor cover (100) provided on an upper part of the rear cover (101); a peripheral wall (100a) of the sensor cover (100); and an end face (102a) of the bearing house (102); the resolver stator (90) is located between the peripheral wall (100a) and the end face (102a) and is sandwiched between the peripheral wall (100a) and the end face (102a), The bearing house (102) made of iron is integrated with the rear cover (101) made of aluminum by any one of casting, press fitting, shrink fitting, caulking, welding and bonding. A resolver sensor fixing structure characterized by:

2. 2. The resolver sensor fixing structure according to claim 1, further comprising one or more recessed grooves (90c) formed in an outer periphery (90a) of the resolver stator (90) and one or more protrusions (210) provided on the bearing house (102), and the resolver stator (90) and the bearing house (102) are integrally formed by fitting the recessed grooves (90c) into the protrusions (210).

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