JP4926205B2 - Resolver - Google Patents

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Publication number
JP4926205B2
JP4926205B2 JP2009117650A JP2009117650A JP4926205B2 JP 4926205 B2 JP4926205 B2 JP 4926205B2 JP 2009117650 A JP2009117650 A JP 2009117650A JP 2009117650 A JP2009117650 A JP 2009117650A JP 4926205 B2 JP4926205 B2 JP 4926205B2
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Prior art keywords
resolver
resolver rotor
rotor
shaft
press
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JP2010266325A (en
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明彦 森川
晋介 逸見
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2009117650A priority Critical patent/JP4926205B2/en
Priority to FR0955869A priority patent/FR2945625B1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K24/00—Machines adapted for the instantaneous transmission or reception of the angular displacement of rotating parts, e.g. synchro, selsyn
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Power Steering Mechanism (AREA)

Description

この発明は、シャフトに圧入されるレゾルバロータを有し、回転子の回転角度を検出するレゾルバに関するものである。   The present invention relates to a resolver having a resolver rotor that is press-fitted into a shaft and detecting a rotation angle of a rotor.

従来、シャフトに圧入されるレゾルバロータと、レゾルバロータの外周に設けられレゾルバロータとの間のギャップパーミアンスをレゾルバロータと協同して変化させるレゾルバステータとを備えたレゾルバが知られている（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, a resolver is known that includes a resolver rotor that is press-fitted into a shaft, and a resolver stator that changes gap permeance between the resolver rotor and the resolver rotor in cooperation with the resolver rotor (for example, Patent Document 1).

特開２００７-１０１４８０号公報JP 2007-101480 A

上記構成のレゾルバは、シャフトにレゾルバロータの内周全面で圧入しているため、例えばシャフト外径が大きくなる場合、レゾルバロータの径方向の幅寸法が小さくなる。
そのため、例えばレゾルバロータに圧入するシャフトの部位における外径寸法のバラツキにより、それに合わせて圧入後のレゾルバロータの外周面形状が変化する結果、レゾルバロータとレゾルバステータとの間のギァップが変化してしまい、ギャップパーミアンスに悪影響を与え、回転角度の検出精度及び変圧比が安定しないという問題点があった。 Since the resolver having the above configuration is press-fitted into the shaft over the entire inner circumference of the resolver rotor, for example, when the outer diameter of the shaft is increased, the width dimension in the radial direction of the resolver rotor is reduced.
For this reason, for example, due to variations in the outer diameter of the portion of the shaft that is press-fitted into the resolver rotor, the outer peripheral surface shape of the resolver rotor after press-fitting changes accordingly, resulting in a change in the gap between the resolver rotor and resolver stator. Therefore, there is a problem that the gap permeance is adversely affected and the detection accuracy of the rotation angle and the transformation ratio are not stable.

この発明は、このような問題点を解決することを課題とするものであって、部品点数や組立工数を増やすことなく、回転角度の検出精度及び変圧比が安定化したレゾルバを提供することを目的とする。   An object of the present invention is to provide a resolver in which the rotational angle detection accuracy and the transformation ratio are stabilized without increasing the number of parts and the number of assembly steps. Objective.

この発明に係るレゾルバは、シャフトが圧入される内周面を有するレゾルバロータと、このレゾルバロータと同心でレゾルバロータを囲って設けられたレゾルバステータとを備え、前記シャフトとともにレゾルバロータが回転し、レゾルバロータと前記レゾルバステータとの間のギァップパーミアンスの変化により回転角度を検出するレゾルバにおいて、前記レゾルバロータの前記内周面には、塑性変形する凸部が複数個形成されており、前記凸部は、周方向に沿って切断したときの形状が円弧形状であり、かつ前記レゾルバロータの対向して形成された孔の部位では、径方向の幅寸法が最大であり、前記孔の部位と、レゾルバロータの径方向の幅寸法が最小の部位では、他の部位と比較して隣接した凸部間の距離が大きい。 A resolver according to the present invention includes a resolver rotor having an inner peripheral surface into which a shaft is press-fitted, and a resolver stator provided concentrically with the resolver rotor and surrounding the resolver rotor, and the resolver rotor rotates together with the shaft. In a resolver that detects a rotation angle by a change in gap permeance between a resolver rotor and the resolver stator, a plurality of convex portions that are plastically deformed are formed on the inner peripheral surface of the resolver rotor. The portion has a circular arc shape when cut along the circumferential direction, and has a radial width dimension at the hole portion formed opposite to the resolver rotor. In the part where the width dimension in the radial direction of the resolver rotor is the smallest, the distance between the adjacent convex parts is larger than in other parts.

この発明に係るレゾルバによれば、レゾルバロータの内周面には、塑性変形する凸部が形成されているので、レゾルバロータの内径寸法やシャフトの外径寸法を変更したときでも、シャフトへの圧入時に凸部を局部的に塑性変形させることで、圧入時のレゾルバロータの外周面の歪みは、凸部で吸収され、レゾルバロータの外周面の歪む、変形は抑制されるので、部品点数や組立工数を増やすことなく、回転角度の検出精度及び変圧比が安定する。   According to the resolver according to the present invention, since the inner peripheral surface of the resolver rotor is formed with a convex portion that is plastically deformed, even when the inner diameter dimension of the resolver rotor and the outer diameter dimension of the shaft are changed, By locally plastically deforming the convex portion at the time of press-fitting, distortion of the outer peripheral surface of the resolver rotor at the time of press-fitting is absorbed by the convex portion, and distortion and deformation of the outer peripheral surface of the resolver rotor are suppressed. The detection accuracy of the rotation angle and the transformation ratio are stabilized without increasing the number of assembly steps.

この発明の実施の形態１に係るブラシレスモータを示す断面図である。It is sectional drawing which shows the brushless motor which concerns on Embodiment 1 of this invention. 図１のブラシレスモータの正面図である。It is a front view of the brushless motor of FIG. 図１のレゾルバロータを示す正面図である。It is a front view which shows the resolver rotor of FIG. 図３の右側面図である。FIG. 4 is a right side view of FIG. 3. 図１のレゾルバ本体を示す正面図である。It is a front view which shows the resolver main body of FIG. 図５の右側面図である。FIG. 6 is a right side view of FIG. 5.

実施の形態１．
図１は、この発明の実施の形態１に係るブラシレスモータ１（モータと略称する）を示す断面図、図２は、図１のモータ１の正面図である。
このモータ１は、電動パワーステアリング装置に組み込まれたモータであり、鉄板を絞り加工した有底円筒状のフレーム２と、フレーム２の開口部を覆って固定されたアルミニウムからなるハウジング３とを有している。
ハウジング３の中央部に形成された窓部４には、外輪部がコーキングされて固定されたフロントベアリング５が取り付けられている。
また、フレーム２の底部には、凹状のベアリングボックス６が設けられており、ベアリングボックス６には、リアベアリング７が挿入されている。
フロントベアリング５およびリアベアリング７は、磁性体である鉄からなるシャフト８をそれぞれ回転自在に支持している。 Embodiment 1 FIG.
1 is a sectional view showing a brushless motor 1 (abbreviated as a motor) according to Embodiment 1 of the present invention, and FIG. 2 is a front view of the motor 1 of FIG.
This motor 1 is a motor incorporated in an electric power steering apparatus, and has a bottomed cylindrical frame 2 obtained by drawing an iron plate, and a housing 3 made of aluminum fixed so as to cover an opening of the frame 2. is doing.
A front bearing 5 having an outer ring portion caulked and fixed thereto is attached to the window portion 4 formed at the center of the housing 3.
A concave bearing box 6 is provided at the bottom of the frame 2, and a rear bearing 7 is inserted into the bearing box 6.
The front bearing 5 and the rear bearing 7 rotatably support a shaft 8 made of iron that is a magnetic material.

シャフト８の一端部には、磁界を発生させるマグネット９が取り付けられて回転子１０が構成されている。マグネット９の外周面には、マグネット９を保護する図示しない保護チューブが被せられている。
フレーム２の内周面には、回転子１０の外周を囲って固定子１１が取り付けられている。
固定子１１は、珪素鋼板を積層して形成された固定子鉄心１２と、樹脂製の絶縁体１３と、絶縁体１３に巻装されたモータコイル１４とを有している。モータコイル１４は、Ｕ相、Ｖ相、Ｗ相の３相からなり、それぞれスター結線されている。
ハウジング３の反回転子１０側（回転子１０の反対側）で、シャフト８の他端部には、外部機構と接続される連結部８ａが形成されている。
シャフト８には、レゾルバロータ１５が圧入されている。このレゾルバロータ１５は、シャフト８に圧入されてフロントベアリング５に当接したブッシュ１６と、シャフト８に圧入されたブッシュ１７との間に挟まれ、固定されている。 A magnet 9 that generates a magnetic field is attached to one end of the shaft 8 to form a rotor 10. A protective tube (not shown) for protecting the magnet 9 is put on the outer peripheral surface of the magnet 9.
A stator 11 is attached to the inner peripheral surface of the frame 2 so as to surround the outer periphery of the rotor 10.
The stator 11 has a stator core 12 formed by laminating silicon steel plates, a resin insulator 13, and a motor coil 14 wound around the insulator 13. The motor coil 14 has three phases of U phase, V phase, and W phase, and is star-connected.
On the other side of the shaft 8 on the side opposite to the rotor 10 of the housing 3 (on the opposite side of the rotor 10), a connecting portion 8a connected to an external mechanism is formed.
A resolver rotor 15 is press-fitted into the shaft 8. The resolver rotor 15 is sandwiched and fixed between a bush 16 that is press-fitted into the shaft 8 and is in contact with the front bearing 5 and a bush 17 that is press-fitted into the shaft 8.

レゾルバロータ１５は、図３及び図４に示すように、珪素鋼板を積層した楕円形状であり、内周面１５ｃには、凸部１５ａが周方向に沿って設けられている。
レゾルバロータ１５を着磁する際の位置決めに用いられる孔１５ｄの左右には、隣接した珪素鋼板同士を接合するための凹凸形状のカシメ部１５ｅが形成されている。各珪素鋼板は、カシメ部１５ｅが形成されており、隣接した珪素鋼板同士がカシメ部１５ｅで、嵌着されることで接合されている。
レゾルバロータ１５は、内周面１５ｃが真円であるのに対して、外周面１５ｂが楕円形であり、対向して形成された孔１５ｄの部位では、径方向の幅寸法が最大で、これに対して垂直方向の径方向の幅寸法が最小である。 As shown in FIGS. 3 and 4, the resolver rotor 15 has an elliptical shape in which silicon steel plates are laminated, and a convex portion 15 a is provided on the inner peripheral surface 15 c along the circumferential direction.
Concave and convex caulking portions 15e for joining adjacent silicon steel plates are formed on the left and right sides of the holes 15d used for positioning when the resolver rotor 15 is magnetized. Each of the silicon steel plates is formed with a crimped portion 15e, and the adjacent silicon steel plates are joined together by fitting with the crimped portion 15e.
In the resolver rotor 15, the inner peripheral surface 15c is a perfect circle, whereas the outer peripheral surface 15b is an ellipse. However, the radial width dimension in the vertical direction is minimum.

凸部１５ａは、周方向に沿って切断したときの形状が円弧形状であり、その値はＲ０．２（曲率半径０．２ｍｍ）以上である。また、それぞれの凸部１５ａは、軸線方向の全領域にわたって列状に形成されている。
この実施の形態では、凸部１５ａは、図３に示すように、周方向に沿って全部で１６あり、それぞれは、中心点Ｏに対して対象位置にある。
また、凸部１５ａは、レゾルバロータ１５の径方向の幅寸法の違いに応じて凸部１５ａが配置されている。即ち、孔１５ｄの部位、レゾルバロータ１５の径方向の幅寸法が最小の部位では、他の部位と比較して隣接した凸部１５ａ間の距離が大きい。 The convex portion 15a has a circular arc shape when cut along the circumferential direction, and its value is equal to or greater than R0.2 (curvature radius 0.2 mm). Moreover, each convex part 15a is formed in the row form over the whole area | region of an axial direction.
In this embodiment, as shown in FIG. 3, there are a total of 16 convex portions 15 a along the circumferential direction, and each is at a target position with respect to the center point O.
Moreover, the convex part 15a is arrange | positioned according to the difference in the width dimension of the radial direction of the resolver rotor 15. As shown in FIG. That is, in the part of the hole 15d and the part where the radial width dimension of the resolver rotor 15 is minimum, the distance between the adjacent convex parts 15a is larger than the other parts.

図５は、レゾルバロータ１５とともに、レゾルバを構成するレゾルバ本体１８からカバー（図示せず）を除いたときの図、図６は図５の右側面図である。
このレゾルバ本体１８は、レゾルバステータ２０と、信号線接続用のオス側コネクタ２１とを有している。レゾルバスタータ２０の外周面は、ハウジング３に形成された取付面１９に嵌着されている。
レゾルバステータ２０は、珪素鋼板を積層し、周方向に等しい間隔をおいて形成された複数のティース２２を有する積層体２３と、絶縁体２４を介してティース２２に導線が巻装された、１相の励磁巻線２５及び２相の出力巻線２６ａ，２６ｂを有している。積層体２３は、両側に突出した耳部４０を有しており、レゾルバ本体１８は、この耳部４０でねじ（図示せず）を用いてハウジング３に固定されている。
１相の励磁巻線２５は、隣接するそれぞれのティース２２に連続的に巻装されている。２相の出力巻線２６のうち、第１の出力巻線２６ａは、隣接するそれぞれのティース２２に連続的に、かつティース２２の中心線に対して励磁巻線２５の径方向外側に巻装されている。また、第２の出力巻線２６ｂは、隣接するそれぞれのティース２２に連続的に、かつティース２２の中心線に対して第１の出力巻線２６ａの径方向外側に巻装されている。 5 is a view when the cover (not shown) is removed from the resolver main body 18 constituting the resolver together with the resolver rotor 15, and FIG. 6 is a right side view of FIG.
The resolver body 18 includes a resolver stator 20 and a male connector 21 for signal line connection. The outer peripheral surface of the resolver starter 20 is fitted to a mounting surface 19 formed on the housing 3.
The resolver stator 20 is formed by laminating silicon steel sheets, a laminated body 23 having a plurality of teeth 22 formed at equal intervals in the circumferential direction, and a conductive wire wound around the teeth 22 via an insulator 24. It has a phase excitation winding 25 and two-phase output windings 26a, 26b. The laminated body 23 has the ear | edge part 40 protruded on both sides, and the resolver main body 18 is being fixed to the housing 3 using the screw | thread (not shown) by this ear | edge part 40. FIG.
The one-phase excitation winding 25 is continuously wound around each adjacent tooth 22. Of the two-phase output windings 26, the first output winding 26 a is wound continuously around each adjacent tooth 22 and radially outside the excitation winding 25 with respect to the center line of the tooth 22. Has been. The second output winding 26 b is wound around each adjacent tooth 22 continuously and on the radially outer side of the first output winding 26 a with respect to the center line of the tooth 22.

モータコイル１４に接続されて電力を供給するモータリード線２７は、グロメット３０を通じて外部に導出される。また、回転子１０の回転角度に関する信号を外部に伝送するセンサリード線２９は、メス側コネクタ２８を介してオス側コネクタ２１に接続され、ハウジング３に設けられたグロメット３１を通じて外部に導出される。   A motor lead wire 27 connected to the motor coil 14 and supplying electric power is led out to the outside through the grommet 30. In addition, a sensor lead wire 29 that transmits a signal related to the rotation angle of the rotor 10 to the outside is connected to the male connector 21 via the female connector 28 and led to the outside through a grommet 31 provided in the housing 3. .

次に、上記構成のモータ１についての動作を説明する。
励磁巻線２５には、図示しない検出用電源から、１０ｋＨｚ、５Ｖｐｐの正弦波状の励磁電圧が印加される。励磁巻線２５に励磁電圧が印加されることにより、励磁巻線２５に励磁電流が流れ、レゾルバロータ１５とレゾルバステータ２０との間のギャップに磁束が発生する。
また、モータリード線２７からモータコイル１４に電力が供給され、モータコイル１４に３相交流電圧が印加される。モータコイル１４に３相交流電圧が印加されることにより、モータコイル１４に回転磁界が発生し、回転子１０が回転する。
回転子１０が回転することにより、シャフト８を介して互いに連結されたレゾルバロータ１５が回転し、レゾルバロータ１５とレゾルバステータ２０との間のギャップパーミアンスが変化する。
ギャップパーミアンスの変化により、第１出力巻線２６ａと第２の出力巻線２６ｂとの出力電圧波形には、位相差が生じるため、回転子１０の回転角度の検出が可能になる。
第１の出力巻線２６ａおよび第２の出力巻線２６ｂの出力電圧は、センサリード線２９を経由して伝送されて演算部（図示せず）に入力され、回転子１０の回転角度が検出される。 Next, the operation of the motor 1 having the above configuration will be described.
A 10 kHz, 5 Vpp sinusoidal excitation voltage is applied to the excitation winding 25 from a detection power source (not shown). When an excitation voltage is applied to the excitation winding 25, an excitation current flows through the excitation winding 25, and a magnetic flux is generated in the gap between the resolver rotor 15 and the resolver stator 20.
Further, power is supplied from the motor lead wire 27 to the motor coil 14, and a three-phase AC voltage is applied to the motor coil 14. When a three-phase AC voltage is applied to the motor coil 14, a rotating magnetic field is generated in the motor coil 14, and the rotor 10 rotates.
As the rotor 10 rotates, the resolver rotor 15 connected to each other via the shaft 8 rotates, and the gap permeance between the resolver rotor 15 and the resolver stator 20 changes.
Due to the change in the gap permeance, a phase difference occurs in the output voltage waveforms of the first output winding 26a and the second output winding 26b, so that the rotation angle of the rotor 10 can be detected.
The output voltages of the first output winding 26a and the second output winding 26b are transmitted via the sensor lead wire 29 and input to the arithmetic unit (not shown), and the rotation angle of the rotor 10 is detected. Is done.

上記構成のレゾルバによれば、レゾルバロータ１５の内周面１５ｃには、塑性変形する凸部１５ａが形成されているので、レゾルバロータ１５をシャフト８に圧入する際には、凸部１５ａのみに局部的に塑性変形し、レゾルバロータ１５の外周面１５ｂの変形は抑制される。
即ち、例えば、レゾルバロータ１５とレゾルバステータ２０との間のギャップが一定とした場合、シャフト８の径寸法が大きくなる場合には、レゾルバロータ１５の径方向の寸法が小さくなり、それだけレゾルバロータ１５の外周面１５ｂが変形し易くなる。
しかしながら、レゾルバロータ１５の内周面１５ｃには凸部１５ａが形成されているので、このような場合でも、凸部１５ａが塑性変形してシャフト８の径寸法の増大分を吸収し、レゾルバロータ１５の外周面１５ｂの変形を抑えることができ、レゾルバロータ１５とレゾルバステータ２０との間のギャップパーミアンスに対する影響は抑えられ、回転子１０の回転角度の検出精度及び変圧比が安定化する。 According to the resolver having the above configuration, the inner peripheral surface 15c of the resolver rotor 15 is formed with the convex portion 15a that is plastically deformed. Plastic deformation occurs locally, and deformation of the outer peripheral surface 15b of the resolver rotor 15 is suppressed.
That is, for example, when the gap between the resolver rotor 15 and the resolver stator 20 is constant, when the radial dimension of the shaft 8 is increased, the radial dimension of the resolver rotor 15 is decreased, and the resolver rotor 15 is correspondingly increased. The outer peripheral surface 15b of this is easily deformed.
However, since the convex portion 15a is formed on the inner peripheral surface 15c of the resolver rotor 15, even in such a case, the convex portion 15a is plastically deformed to absorb the increase in the diameter of the shaft 8, and the resolver rotor. The deformation of the outer peripheral surface 15b of the rotor 15 can be suppressed, the influence on the gap permeance between the resolver rotor 15 and the resolver stator 20 is suppressed, and the detection accuracy and the transformation ratio of the rotation angle of the rotor 10 are stabilized.

また、凸部１５ａは、周方向に沿って切断したときの形状が円弧形状であるので、凸部１５ａを局部的に変形させた場合でも、応力が集中することなく分散される。
そのため、凸部１５ａの欠け、レゾルバロータ１５の外周面１５ｂの歪みを抑えることができる。 Further, since the convex portion 15a is arc-shaped when cut along the circumferential direction, even when the convex portion 15a is locally deformed, the stress is dispersed without being concentrated.
Therefore, it is possible to suppress chipping of the convex portion 15 a and distortion of the outer peripheral surface 15 b of the resolver rotor 15.

また、凸部１５ａは、Ｒ０．２（曲率半径０．２ｍｍ）以上であるので、一台のプレス金型で、珪素鋼板の打ち抜き加工と、その後の隣接した珪素鋼板の凹凸部でのカシメによる珪素鋼板の積層工程とを行うことができ、レゾルバロータ１５の製作に当たって、製造ラインにおいて打ち抜き加工と、積層工程とを個別に揃える必要性がなく、レゾルバロータ１５を安価に製造することができる。   Moreover, since the convex part 15a is R0.2 (curvature radius 0.2mm) or more, it is due to the punching process of the silicon steel sheet and the subsequent caulking at the uneven part of the adjacent silicon steel sheet with one press die. It is possible to perform a silicon steel sheet laminating process, and when manufacturing the resolver rotor 15, there is no need to separately perform a punching process and a laminating process in the production line, and the resolver rotor 15 can be manufactured at low cost.

また、凸部１５ａは、周方向に沿って、複数個形成されており、レゾルバロータ１５の径方向の幅寸法の違いに応じて凸部１５ａを配置することにより、圧入時のレゾルバロータ１５の外周面１５ｂの変形をより効果的に抑えることができる。   In addition, a plurality of convex portions 15a are formed along the circumferential direction, and by arranging the convex portions 15a according to the difference in the radial width dimension of the resolver rotor 15, the resolver rotor 15 at the time of press-fitting is arranged. The deformation of the outer peripheral surface 15b can be more effectively suppressed.

また、凸部１５ａは、それぞれレゾルバロータ１５の中心点Ｏに対して、対象位置に形成されているので、円形のシャフト８にレゾルバロータ１５を圧入する際には、シャフト８とレゾルバロータ１５との周方向の相対角度がどの角度であっても、シャフト８の中心軸線とレゾルバロータ１５の中心軸線とが一致した状態で圧入作業を行うことができ、シャフト８とレゾルバロータ１５とが同心で結合される。   Further, since the convex portions 15 a are formed at the target positions with respect to the center point O of the resolver rotor 15, when the resolver rotor 15 is press-fitted into the circular shaft 8, the shaft 8 and the resolver rotor 15 Whatever the relative angle in the circumferential direction is, the press-fitting operation can be performed in a state where the central axis of the shaft 8 and the central axis of the resolver rotor 15 coincide with each other, and the shaft 8 and the resolver rotor 15 are concentric. Combined.

なお、上記実施の形態では、モータが３相ブラシレスモータ１である場合を例にして説明したが、勿論このものに限定されるものではなく、直流モータ、交流モータ、発電機を問わず、レゾルバを用いた回転位置を検出するシステム全てに用いることができ、同様の効果を奏することができる。
また、この発明は、電動パワーステアリング装置用のモータ以外にも適用することができ、例えばサーボモータ、ハイブリッド用駆動モータにも適用できるのは勿論である。
また、凸部１５ａの数も１６に限定されないのは勿論である。 In the above embodiment, the case where the motor is the three-phase brushless motor 1 has been described as an example. However, the present invention is not limited to this, and any resolver can be used regardless of a DC motor, an AC motor, or a generator. It can be used for all systems that detect the rotational position using, and the same effect can be obtained.
Further, the present invention can be applied to a motor other than the motor for the electric power steering apparatus. For example, the present invention can also be applied to a servo motor and a hybrid drive motor.
Of course, the number of convex portions 15a is not limited to 16.

１ モータ、２ フレーム、３ ハウジング、４ 窓部、５ フロントベアリング、６ ベアリングボックス、７ リアベアリング、８ シャフト、８ａ 連結部、９ マグネット、１０ 回転子、１１ 固定子、１２ 固定子鉄心、１３ 絶縁体、１４ モータコイル、１５ レゾルバロータ、１５ａ 凸部、１５ｂ 外周面、１５ｃ 内周面、１５ｄ 孔、１５ｅ カシメ部、１６，１７ ブッシュ、１８ レゾルバ本体、１９ 取付面、２０ レゾルバステータ、２１ コネクタ、２２ ティース、２３ 積層体、２４ 絶縁体、２５ 励磁巻線、２６ａ 第１の出力巻線、２６ｂ 第２の出力巻線、２７ モータリード線、２８ メス側コネクタ、２９ センサリード線、３０，３１ グロメット、４０ 耳部。   1 Motor, 2 frame, 3 housing, 4 window part, 5 front bearing, 6 bearing box, 7 rear bearing, 8 shaft, 8a connecting part, 9 magnet, 10 rotor, 11 stator, 12 stator core, 13 insulation Body, 14 motor coil, 15 resolver rotor, 15a convex portion, 15b outer peripheral surface, 15c inner peripheral surface, 15d hole, 15e caulking portion, 16, 17 bush, 18 resolver body, 19 mounting surface, 20 resolver stator, 21 connector, 22 Teeth, 23 Laminated body, 24 Insulator, 25 Excitation winding, 26a First output winding, 26b Second output winding, 27 Motor lead, 28 Female connector, 29 Sensor lead, 30, 31 Grommet, 40 ears.

Claims (4)

シャフトが圧入される内周面を有するレゾルバロータと、
このレゾルバロータと同心でレゾルバロータを囲って設けられたレゾルバステータとを備え、前記シャフトとともにレゾルバロータが回転し、レゾルバロータと前記レゾルバステータとの間のギァップパーミアンスの変化により回転角度を検出するレゾルバにおいて、
前記レゾルバロータの前記内周面には、塑性変形する凸部が複数個形成されており、前記凸部は、周方向に沿って切断したときの形状が円弧形状であり、かつ前記レゾルバロータの対向して形成された孔の部位では、径方向の幅寸法が最大であり、前記孔の部位と、レゾルバロータの径方向の幅寸法が最小の部位では、他の部位と比較して隣接した凸部間の距離が大きいことを特徴とするレゾルバ。 A resolver rotor having an inner peripheral surface into which a shaft is press-fitted, and
A resolver stator concentrically and surrounding the resolver rotor. The resolver rotor rotates together with the shaft, and a rotation angle is detected by a change in gap permeance between the resolver rotor and the resolver stator. In the resolver,
On the inner circumferential surface of the resolver rotor, protrusions plastic deformation are plural number, the protrusions, the shape when cut along the circumferential direction an arc shape, and the resolver rotor In the hole portion formed oppositely, the radial width dimension is the maximum, and in the hole portion and the portion where the radial width dimension of the resolver rotor is the minimum, it is adjacent as compared with other portions. A resolver characterized in that the distance between the convex portions is large . 前記凸部は、Ｒ０．２以上であることを特徴とする請求項１に記載のレゾルバ。   The resolver according to claim 1, wherein the convex portion is R0.2 or more. 偶数個の前記凸部は、それぞれ前記レゾルバロータの中心軸心に対して、対象位置に形成されていることを特徴とする請求項２に記載のレゾルバ。   3. The resolver according to claim 2, wherein the even number of convex portions is formed at a target position with respect to a central axis of the resolver rotor. 前記レゾルバロータは、電動パワーステアリング装置に組み込まれたブラシレスモータのシャフトの端部に圧入されることを特徴とする請求項１〜３の何れか１項に記載のレゾルバ。   The resolver according to any one of claims 1 to 3, wherein the resolver rotor is press-fitted into an end portion of a shaft of a brushless motor incorporated in an electric power steering apparatus.
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