JP4516683B2 - Resolver mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resolver mounting structure for mounting a resolver for detecting a rotation angle of a motor to the motor.
[0002]
[Prior art]
As a conventional resolver mounting structure of this type, for example, one disclosed in Japanese Patent Laid-Open No. 2000-85385 is known. This mounting structure is applied to a resolver that detects a rotation angle of a motor that drives a vehicle, and the resolver, the motor, a torque converter coupled to the motor, and the like are accommodated in a transmission housing. The resolver rotor is attached to the outer periphery of the input shaft of the torque converter that is directly connected to the shaft of the motor in a non-rotating state and in an axially movable state. Further, the resolver stator is fixed to the partition wall of the transmission housing with bolts, and is arranged so as to be close to the outer peripheral surface of the rotor in a state in which the position in the axial direction coincides with the rotor. . The bolt is passed through a long hole in the circumferential direction formed in the stator and screwed into the partition wall. Therefore, by rotating the stator with the bolt loosened, the relative angle with the rotor, that is, the resolver It is possible to adjust the phase.
[0003]
In addition, the above mounting structure is an example in which the resolver is accommodated in the transmission housing. However, in the absence of such a housing, a resolver cover is usually separately provided for waterproofing, dustproofing and protecting the resolver. Provided. As a conventional attachment structure with such a cover, a resolver cover made of a non-conductor is attached to the motor housing so as to cover the resolver, and the resolver wire is taken out through a grommet attached to the resolver cover, A device in which a coupler for connecting to an external device is attached to the tip is known. In this attachment structure, another coupler for separating the wire is attached in the middle of the wire so that the phase of the resolver can be adjusted with the resolver cover removed.
[0004]
[Problems to be solved by the invention]
However, the conventional mounting structure with a cover described above requires a resolver cover and a grommet for waterproofing the resolver, and also requires a coupler for separating wires in addition to a coupler for connecting to an external device. Therefore, the number of parts increases, which is disadvantageous in terms of cost. In addition, a space for accommodating the wire and the coupler for disconnecting the wire must be secured in the resolver cover, which increases the size. Further, in order to adjust the phase of the resolver, it is necessary to perform a disassembling operation such as removing the resolver cover and cutting the wire at the coupler portion, which makes the operation complicated. In addition, since the resolver cover is made of a non-conductor, electrostatic shielding is insufficient, and magnetic noise generated in the motor may leak to the outside. In this case, the number of parts and the number of assembly steps are further increased.
[0005]
The present invention has been made to solve such a problem. In the case where a resolver is attached to a motor, it is possible to reduce the number of parts and achieve cost reduction and compactness, and positioning and phase of the stator with respect to the rotor. It is an object of the present invention to provide a resolver mounting structure that can be easily adjusted.
[0006]
[Means for Solving the Problems]
In order to achieve this object, claim 1 of the present invention is a resolver mounting structure for mounting a resolver 1 for detecting a rotation angle of a motor 2 to the motor 2, and the rotor 13 of the resolver 1 is attached to the shaft 4 of the motor 2. The wire 20 that is attached and made of a non- conductor, holds the stator 14 of the resolver 1 inside, and is connected to the winding of the stator 14 (the output winding 15 in the embodiment (hereinafter the same in this section)) is internally And a stator holder 16 integrally formed with the stator 14 and the coupler portion 19, and the stator holder 16 is mounted on the motor 2 housing (motor housing 3) in a relatively rotatable state. axial second shaft 4 to the fitting contact is fixed, the stator holder 16 is formed in a ring shape, a motor Are arranged so as to face the to end and the axial direction of the stator 6, and further has an electrostatic shield for reducing electromagnetic noise from the stator 6 of the motor 2 (electrostatic shield plate 23) that It is characterized by.
[0007]
According to this resolver mounting structure, the stator holder has a coupler portion that holds the stator of the resolver on the inner side thereof and passes a wire connected to the winding of the stator. Further, the stator holder abuts on the motor housing and serves as a cover for waterproofing the resolver. Therefore, the number of parts is reduced compared to the conventional case where the resolver cover and the coupler for taking out the output are configured as separate parts, and the conventional grommet and the coupler for separating the wires are also unnecessary. The score can be further reduced. Further, since it is not necessary to secure a space for accommodating the wire and the coupler for disconnection inside the stator holder, the size can be reduced accordingly.
[0008]
Further, the resolver rotor is attached to the motor shaft, and the stator holder for holding the stator is attached to the motor housing in a state of fitting and contacting the motor housing in the axial direction of the motor shaft. By fitting the stator holder to the motor housing in such a manner, the stator can be simultaneously positioned at predetermined positions in both the radial direction and the axial direction with respect to the rotor, so that the stator can be easily positioned. .
[0009]
Furthermore, since the stator holder is fitted and abutted on the motor housing in a relatively rotatable state, the stator can be positioned in the circumferential direction relative to the rotor, that is, the phase of the resolver can be adjusted simply by turning the stator holder relative to the motor housing. be able to. As described above, the phase adjustment of the resolver can be easily performed without removing the stator holder by simply releasing the fixing of the stator holder to the motor housing. Furthermore, electromagnetic noise from the motor can be reliably reduced by the electrostatic shield part. Further, since the stator holder has this electrostatic shield part, the number of parts and the number of assembly steps can be reduced as compared with the conventional case where the shield plate is attached with screws or the like.
[0010]
According to a second aspect of the present invention, in the resolver mounting structure of the first aspect, a bearing 11 that supports a base end side opposite to the output side of the shaft 4 of the motor 2 is mounted to the stator holder 16. It is characterized by that.
[0011]
According to this configuration, the bearing that supports the base end side of the shaft of the motor is attached to the stator holder, and there is no need to provide the motor housing with a bearing support portion that supports the bearing. Can be achieved. Also, the bearing on the base end side is much smaller than the bearing on the output side because the distance from the reaction point of the driven element driven by the motor is far away, so the bearing load is very small. By attaching the bearing to the stator holder, the shaft of the motor can be supported without hindrance without particularly reinforcing the stator holder.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a resolver mounting structure according to the first embodiment. As shown in FIG. 1, the motor 2 to which the resolver 1 is attached includes a motor housing 3, a shaft 4 provided in the motor housing 3, a rotor 5, a stator 6, and the like. 7 is wound. The motor housing 3 is formed into a cylindrical shape by aluminum alloy or the like, and ring-shaped bearing holding portions 8 and 9 projecting inward are integrally formed at the centers of both end portions in the axial direction. The bearings 10 and 11 are fitted and held in the bearing holding portions 8 and 9. The shaft 4 is rotatably supported by the output end portion and the base end portion via these bearings 10 and 11 and protrudes from the motor housing 3. A driven element (not shown) driven by the motor 2 is connected to the output end of the shaft 4. Further, on the outer side surface of the motor housing 3 on the base end side, an outwardly projecting ring-shaped stator positioning portion 12 for positioning a later-described stator 14 of the resolver 1 has a predetermined inner diameter and projecting length. It is integrally formed.
[0015]
On the other hand, the resolver 1 includes a rotor 13 attached to the base end surface of the shaft 4 of the motor 2 and a ring-shaped stator 14 disposed so as to surround the rotor 13. Both the rotor 13 and the stator 14 are formed of a laminated iron core. In the resolver 1, for example, an excitation winding (not shown) and two sets of output windings 15 (windings) (only one set is shown) are wound around a stator 14 and the outer periphery of the rotor 13 is noncircular. In this way, the induced voltages of the two sets of output windings 15 are configured to change in a sine wave shape and a cosine wave shape according to the rotation of the rotor 13. Then, output signals from the two sets of output windings 15 are output to the outside via a coupler unit 19 to be described later, and converted by a resolver / digital (R / D) converter (not shown). Based on the phase relationship between the two output signals, the rotation angle of the shaft 4 of the motor 2 is detected as an absolute angle.
[0016]
Since the rotation angle of the motor 2 is detected by the above-described principle, in order to obtain a higher detection accuracy with the resolver 1, the stator 14 is moved relative to the rotor 13 in the axial direction, radial direction and circumferential direction. It is necessary to position at a predetermined position. Of these, the positioning accuracy in the circumferential direction, in particular, directly affects the phase relationship between the two output signals, and thus has a great influence on the detection accuracy, and the winding 7 and the output on the resolver 1 side and the motor 2 side, respectively. There are individual differences due to the winding condition of the winding 15, and these individual differences appear accumulated in the phase relationship. For this reason, it is inevitable that a certain degree of error occurs in the phase relationship when the stator 14 is attached. Therefore, it is necessary to adjust the phase by adjusting the relative angle between the rotor 13 and the stator 14 after the attachment. .
[0017]
The stator 14 is attached to the motor 2 via the stator holder 16 and the motor housing 3 while being held by the stator holder 16. As shown in FIG. 2, the stator holder 16 is formed by integrally molding a nonconductor made of synthetic resin or the like together with the stator 14 by, for example, injection molding, and includes a stator holding recess 17, a housing contact portion 18, and the coupler portion. 19 etc. are provided integrally. The stator holding recess 17 is formed in a circular shape on the inner surface of the stator holder 16, has an inner diameter equal to the stator positioning portion 12 of the motor housing 3 and a predetermined depth, and the thickness direction of the integrally formed stator 14 Is held on the inner peripheral surface. The housing contact portion 18 is formed in a ring shape protruding inward over the entire outer periphery of the stator holder 16, and has an outer diameter equal to the motor housing 3 and a predetermined protruding length.
[0018]
Further, the coupler portion 19 is formed to protrude outward at a predetermined position outside the housing contact portion 18 of the stator holder 16. Inside the coupler portion 19, a wire 20 for taking out the output of the resolver 1 is integrally formed. The wire 20 is made of a material harder than the output winding 15 of the stator 14 and is disposed so as to extend between the internal potting processing portion 21 and the outside. Then, after the stator holder 16 is formed, an extraction portion 15a of the output winding 15 fed out through the potting processing section 21 is connected to the wire 20 via the coupler pin 22, and then to the potting processing section 21. By performing the potting process at room temperature and normal pressure, the take-out portion 15a of the output winding 15 is fixed. Through the processing as described above, the output winding 15 can be reliably connected to the coupler portion 19 without causing disconnection due to molding pressure during injection molding.
[0019]
Further, an electrostatic shield plate 23 (electrostatic shield portion) is provided on the housing contact portion 18 of the stator holder 16 (see FIG. 1). The electrostatic shield plate 23 is for reducing electromagnetic noise from the motor 2, is formed in a ring shape from a conductive material such as aluminium, and is attached to the inner peripheral surface of the housing contact portion 18 by, for example, press fitting. And is grounded by appropriate grounding means (not shown).
[0020]
The stator holder 16 is attached to the motor housing 3 as shown in FIG. 1 while holding the stator 14 as described above. That is, the inner surface of the stator holder 16 is brought into contact with the outer surface on the proximal end side of the motor housing 3 and the half projecting inward of the stator 14 is brought into contact with the stator positioning portion 12, and the stator The stator holder 16 is attached to the motor housing 3 by tightening bolts passed through elongated holes formed in the circumferential direction of the holder 16 via O-rings (both not shown).
[0021]
As described above, according to this embodiment, the stator 14 of the resolver 1 is held inside the stator holder 16 and the wire 20 connected to the output winding 15 of the stator 14 is passed inside. The coupler portion 19 is integrally molded. Further, the stator holder 16 abuts on the motor housing 3 and serves as a cover for waterproofing the resolver 1. Therefore, the number of parts is reduced compared to the conventional case where the resolver cover and the coupler for taking out the output are configured as separate parts, and the conventional grommet and the coupler for separating the wires are also unnecessary. The score can be further reduced. Further, since it is not necessary to secure a space for accommodating the wire and the coupler for disconnection inside the stator holder 16, it is possible to reduce the size accordingly.
[0022]
Further, since the stator holder 16 is attached in a state of being fitted to the motor housing 3 via the stator 14 held by the stator holder 16, the stator holder 16 is attached in a radial direction with respect to the rotor 5 attached to the shaft 4 of the motor 2. Can be positioned at a predetermined position. Further, in this mounted state, the shoulder portion of the stator holding recess 17 of the stator holder 16 and the housing contact portion 18 are in contact with the stator positioning portion 12 and the outer peripheral portion of the motor housing 3, respectively, and as described above, Is preset to a predetermined value, the stator 14 can be positioned at a predetermined position in the axial direction with respect to the rotor 13. Therefore, by simply attaching the stator holder 16 to the motor housing 3 as described above, the radial and axial positioning of the stator 14 with respect to the rotor 13 can be easily and accurately performed.
[0023]
Further, since the stator positioning portion 12 of the motor housing 3 to which the stator 14 is fitted is formed in a ring shape, the stator holder 16 is rotated with respect to the motor housing 3 in such a fitted state. Is possible. Therefore, the bolts for fixing both 3 and 16 are loosened, and the former 16 is simply rotated relative to the latter 3, and the stator 14 is positioned relative to the rotor 13 in the circumferential direction without removing the stator holder 16, that is, the phase of the resolver 1 is adjusted. Can be easily performed.
[0024]
In addition, an electrostatic shield plate 23 provided on the housing contact portion 18 of the stator holder 16 extends over most of the space between the motor housing 3 and electromagnetic noise generated in the motor 2 is reduced by this electrostatic shield. It can be reliably reduced by the plate 23. Further, since the electrostatic shield plate 23 is provided by press fitting or the like into the stator holder 16, the number of parts and the number of assembly steps can be reduced as compared with the conventional case where the shield plate is attached with screws or the like.
[0025]
3 and 4 show a resolver mounting structure according to a second embodiment of the present invention. Hereinafter, the same components as those in the first embodiment described above are denoted by the same reference numerals and described. In this mounting structure, the stator 14 of the resolver 1 is held inside the stator holder 16, and a ring-shaped bearing holding portion 25 is integrally formed further inside the stator holder 16, and is held by the bearing holding portion 25. The base end of the shaft 4 of the motor 2 is rotatably supported by the bearing 11. Accordingly, the bearing holding portion 9 of the motor housing 3 of the first embodiment is abolished, and the end surface on the base end side is opened with the same outer diameter as the other portions. Further, phase-matching fitting projections 27 and 28 that can be fitted to each other are continuously provided in the circumferential direction on the base end surface of the motor housing 3 and the end surface of the housing contact portion 26 of the stator holder 16 that contacts the motor housing 3. Is formed. Therefore, the stator holder 16 is fitted and abutted on the motor housing 3 through these fitting projections 27 and 28 in a state of being relatively rotatable. Other configurations are the same as those of the first embodiment.
[0026]
Therefore, also in the second embodiment, the above-described effects according to the first embodiment can be obtained similarly. In addition, in this embodiment, the bearing 11 that supports the base end portion of the shaft 4 of the motor 2 is held by the bearing holding portion 25 formed in the stator holder 16, and the motor housing of the first embodiment. Since the three-side bearing support portion 9 can be eliminated, the size can be further reduced accordingly. Further, the bearing 11 on the base end side of the shaft 4 of the motor 2 has a bearing load that is farther from the reaction force acting point of the driven element driven by the motor 2 than the bearing 10 on the output side. Since it is very small, the shaft 4 of the motor 2 can be supported without hindrance without particularly reinforcing the stator holder 16 by attaching the bearing 11 on the base end side to the stator holder 16.
[0027]
In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, the electrostatic shield plate 23 press-fitted into the stator holder 16 is employed as the electrostatic shield part that reduces electromagnetic noise from the motor 2. 16, as long as it is formed integrally with the stator holder 16. For example, a conductive material such as aluminum powder may be formed on the inner surface of the stator holder 16 by plating, coating, or the like. It is possible to fill with a filler-like conductive material at the time of molding. The present invention is not limited to the type of resolver exemplified in the embodiment, and can be widely applied to any type of resolver.
[0028]
【The invention's effect】
As described above, according to the resolver mounting structure of the present invention, when the resolver is mounted on a motor, it is possible to realize cost reduction and compactness by reducing the number of parts, and easy positioning and phase adjustment of the stator with respect to the rotor. Can be done. Further, by attaching a bearing that supports the base end side of the shaft of the motor to the stator holder, the stator holder can be further reduced in size without special reinforcement. Furthermore, since the stator holder is provided with the electrostatic shield part, electromagnetic noise from the motor can be reliably reduced, and the number of parts and the number of assembly steps can be further reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a resolver mounting structure according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the stator and the stator holder of FIG.
FIG. 3 is a cross-sectional view showing a resolver mounting structure according to a second embodiment of the present invention.
4 is a cross-sectional view of the stator and the stator holder of FIG. 3;
[Explanation of symbols]
1 Resolver 2 Motor 3 Motor housing (Motor housing)
4 Motor shaft
6 Motor stator 11 Motor base end bearing 12 Stator positioning part 13 Resolver rotor 14 Resolver stator 15 Resolver output winding (winding)
16 Stator holder 17 Stator holding recess 18 Housing contact portion 19 Coupler portion 20 Wire 23 Electrostatic shield plate (electrostatic shield portion)
25 Stator Holder Bearing Holding Portion 26 Housing Abutting Portion 27 Motor Housing Fitting Protrusion 28 Stator Holder Fitting Protrusion

Claims (2)

A resolver mounting structure for mounting a resolver for detecting a rotation angle of a motor to a motor,
The resolver rotor is attached to the motor shaft;
Is composed of a nonconductor, retains the stator of the resolver on the inside, and has a coupler portion through a wire connected to the windings of the stator therein, the stator holder which is integrally molded with the stator and the coupler portion With
The stator holder is fitted and abutted in the axial direction of the shaft of the motor in a relatively rotatable state in the motor housing, and is fixed .
The stator holder is formed in a ring shape and is disposed so as to face the end portion of the stator of the motor in the axial direction, and further includes an electrostatic shield portion that reduces electromagnetic noise from the stator of the motor. Resolver mounting structure characterized by having .   The resolver mounting structure according to claim 1, wherein a bearing that supports a base end side of the motor opposite to an output side of the shaft is attached to the stator holder.

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