CA1129471A - Adhesively bonded stator for stepper motor and method of manufacture - Google Patents
Adhesively bonded stator for stepper motor and method of manufactureInfo
- Publication number
- CA1129471A CA1129471A CA336,217A CA336217A CA1129471A CA 1129471 A CA1129471 A CA 1129471A CA 336217 A CA336217 A CA 336217A CA 1129471 A CA1129471 A CA 1129471A
- Authority
- CA
- Canada
- Prior art keywords
- pole
- pole members
- members
- stepper motor
- faces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000004804 winding Methods 0.000 claims abstract description 22
- 230000004907 flux Effects 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims 5
- 230000001070 adhesive effect Effects 0.000 claims 5
- 238000004026 adhesive bonding Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/02—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of variable reluctance type
- H02K37/08—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of variable reluctance type with rotors axially facing the stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped poles
Abstract
U.S. 945,407 ABSTRACT OF THE DISCLOSURE
One portion of the stator of a variable reluctance stepper motor is formed including windings wrapped around pole members and another portion of the stator is then adhesively bonded to the one portion.
The other portion may comprise the pole faces and/or an annular support member to which the pole members are attached. In the pre-ferred embodiment, the one portion of the stator is formed by crush grinding an annular laminated stator member so as to form the pole members. Preformed coils on bobbins are then placed over the pole members and an annular ring from which the pole faces are made is then adhesively bonded to the pole members. The annular ring which includes the teeth of the magnetic stepper motor is then cut so as to form the separate pole faces.
One portion of the stator of a variable reluctance stepper motor is formed including windings wrapped around pole members and another portion of the stator is then adhesively bonded to the one portion.
The other portion may comprise the pole faces and/or an annular support member to which the pole members are attached. In the pre-ferred embodiment, the one portion of the stator is formed by crush grinding an annular laminated stator member so as to form the pole members. Preformed coils on bobbins are then placed over the pole members and an annular ring from which the pole faces are made is then adhesively bonded to the pole members. The annular ring which includes the teeth of the magnetic stepper motor is then cut so as to form the separate pole faces.
Description
l~Z947~
1 Back~round of the Invention
1 Back~round of the Invention
2 This invention relates to variable reluctance step-
3 per motors and a method of making such stepper motors.
4 Variable reluctance stepper motors are characterized by a plurality of pole members having windings associated 6 therewith and an additional magnetic structure cooperating 7 with the pole members to close the various flux paths in re-8 sponse to the selective energization of the windings. The 9 pole members include pole faces having magnetic discontinui-ties therein which cooperate with similar magnetic discon-11 tinuities in the additional magnetic structure so as to permit 12 the poles and the adtitional magnetic structure to move in dis-13 crete steps relative to one another in response to the selec-14 tive energization of the windings.
Some variable reluctance stepper motors have pole 16 structure which require that the windings be wrapped around 17 the pole members with the magnetic structure in placeO The 18 wrapping of such pole members, particularly in the case of a 19 rotary stepper motor, can be very expensive since it is diffi-cult to ~utomate such winding and the motors must therefore 21 be made, in large measure, by hand.
22 SummarY of the Invention 23 Advantages of this invention are to provide for 24 ease, cost effectiveness and automation in ~he fabrication of a stepper motor.
26 In accordance with the invention there is provided 27 a stepper motor of the variable reluctance type comprising a 28 plurality of poles having a plurality of magnetic discontinui-29 ties at a plurality of pole faces is formed by adhesively bonding one portion of a pole structure having windings 31 wrap?ed around pole members to another portion of the pole 32 structure.
33 In accordance with one important aspect of the inven-34 tion, the windings may be preformed on bobbins and placed on the pole members before the adhesive bonding.
..~
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1 In a particularly preferred embodiment of the inven-2 tion~ the other portion of the pole structure comprises pole 3 faces which are adhesively bonded to the pole members. The 4 pole faces are preformed from a continuous member and subse-quently adhesively bonded to the portion of the pole struc-6 ture carrying the windings. After adhesive bonding, the con-7 tinuous member is cut into the separate pole faces associated 8 with the various pole members. Magnetic discontinuities are 9 formed in the continuous member before adhesive bonding.
In the preferred embodiment, the one portion of the 11 pole structure is formed by grinding the pole members into a 12 lamination to a depth so as to leave a connecting segment be-13 tween the pole members. In the alternative, the pole members 14 may be separately formed with or without the pole faces attached and subsequently adhesively bonded to a connective 16 member. Where the pole members are formed without the pole 17 faces, the pole faces are also adhesively bonded to the pole 18 members.
19 In one embodiment of the invention described in de-tail hereinafter, the pole structure forms the stator of an 21 axial air gap rotary stepper motor. The windings are wrapped 22 around the pole members such that the axes of the windings ex-23 tend in a direction parallel to the axis of the motor. The 24 pole members comprise a substantially uniform cross-sectional area.
26 Brief Description of the Drawin~s 27 Fig. 1 is a perspective view of a blank utilized in 28 forming a portion of the pole structure of this invention;
29 Fig. la is an enlarged view of a portion of the blank shown in Fig. l;
31 Fig. 2 is a perspective, partially schematic illus-32 tration of the blank of Fig. 1 being formed into pole members;
33 Fig. 3 is a perspective view of a preformed winding 34 being placed on a pole member formed by the step of Fig. 2;
Fig. 4 is a perspective view of a blank from which llZ~4~1 1 the pole faces will be formed;
2 Fig. 5 is a perspective view of the blank of Fig. 4 3 after the magnetic discontinuities or teeth of the pole faces 4 have been ~ormed;
Fig. 6 is a perspective view of the ring of Fig. 5 6 after adhesive bonding to the pole structure of Fig. 3;
7 Fig. 7 is a perspective view of the structure of 8 Fig. 6 after the ring has been cut so as to form separate pole 9 faces;
Fig. 8 is a plan view of the pole faces of Fig. 7;
11 Fig. 9 is a side view of the pole structure of Fig.
12 8;
13 Fig. 10 is a sectional view of the pole structure of 14 Fig. 8 taken along line lO-10 thereof in combination with addi-tional magnetic structure including a rotor and an inactive 16 stator portion;
17 Fig. ll is a perspective view of an alternative 18 method of fabricating the pole structure of Figs. l-lO; and l9 Fig. 12 is a perspective view of yet another altern-ative method of fabricating the pole structure of Figs. 1-10.
21 Detailed DescriPtion of Preferred ~mbodiments 22 Referring to Fig. 1, the annular member lO which is 23 adapted to form one portion of a stator pole structure for a 24 variable reluctance stepper motor is shown. The annular mem-ber 10 comprises a high permeability magnetic material, e.g., 26 iron, in the form of a plurality of laminations 12 which may 27 be wound in the form of a coil as shown in Fig. la.
28 In Fig. 2, the annular member 10 is being ground by 29 a crush grinding wheel 14 so as to preform pole members 16.
The pole members 16 are ground from the member 10 to a depth 31 so as to leave a continuous annular support segment 18.
32 In accordance with this invention and as shown in 33 Fig. 3, the pole structure as formed in Fig. 2 is now ready 34 for application of the windings of the variable stepper motor.
As shown in Fig. 3, one of these windings 20 is preformed on ~129~7~
1 a bobbin 22 having an opening 24 therein so as to be placed 2 down over the pole members 16. In this regard, it will be 3 noted that the pole members 16 are of substantially uniform 4 cross-sectional area so as to permit the pole members 16 to freely pass through the opening 24 and substantially conform 6 with the area of that opening. Having now described the for-7 mation of the one portion of the stator pole structure with 8 reference to Figs. 1-3, the formation of the pole face portion 9 of the stator structure will now be described with reference to Figs. 4 and 5.
11 As shown in Fig. 4, a continuous member or ring 26 12 is provided. This ring which is also formed from a high per-13 meability magnetic material is adapted to have discrete mag-14 netic discontinuities in the form of teeth 28 as shown in Fig.
Some variable reluctance stepper motors have pole 16 structure which require that the windings be wrapped around 17 the pole members with the magnetic structure in placeO The 18 wrapping of such pole members, particularly in the case of a 19 rotary stepper motor, can be very expensive since it is diffi-cult to ~utomate such winding and the motors must therefore 21 be made, in large measure, by hand.
22 SummarY of the Invention 23 Advantages of this invention are to provide for 24 ease, cost effectiveness and automation in ~he fabrication of a stepper motor.
26 In accordance with the invention there is provided 27 a stepper motor of the variable reluctance type comprising a 28 plurality of poles having a plurality of magnetic discontinui-29 ties at a plurality of pole faces is formed by adhesively bonding one portion of a pole structure having windings 31 wrap?ed around pole members to another portion of the pole 32 structure.
33 In accordance with one important aspect of the inven-34 tion, the windings may be preformed on bobbins and placed on the pole members before the adhesive bonding.
..~
~ 7~
1 In a particularly preferred embodiment of the inven-2 tion~ the other portion of the pole structure comprises pole 3 faces which are adhesively bonded to the pole members. The 4 pole faces are preformed from a continuous member and subse-quently adhesively bonded to the portion of the pole struc-6 ture carrying the windings. After adhesive bonding, the con-7 tinuous member is cut into the separate pole faces associated 8 with the various pole members. Magnetic discontinuities are 9 formed in the continuous member before adhesive bonding.
In the preferred embodiment, the one portion of the 11 pole structure is formed by grinding the pole members into a 12 lamination to a depth so as to leave a connecting segment be-13 tween the pole members. In the alternative, the pole members 14 may be separately formed with or without the pole faces attached and subsequently adhesively bonded to a connective 16 member. Where the pole members are formed without the pole 17 faces, the pole faces are also adhesively bonded to the pole 18 members.
19 In one embodiment of the invention described in de-tail hereinafter, the pole structure forms the stator of an 21 axial air gap rotary stepper motor. The windings are wrapped 22 around the pole members such that the axes of the windings ex-23 tend in a direction parallel to the axis of the motor. The 24 pole members comprise a substantially uniform cross-sectional area.
26 Brief Description of the Drawin~s 27 Fig. 1 is a perspective view of a blank utilized in 28 forming a portion of the pole structure of this invention;
29 Fig. la is an enlarged view of a portion of the blank shown in Fig. l;
31 Fig. 2 is a perspective, partially schematic illus-32 tration of the blank of Fig. 1 being formed into pole members;
33 Fig. 3 is a perspective view of a preformed winding 34 being placed on a pole member formed by the step of Fig. 2;
Fig. 4 is a perspective view of a blank from which llZ~4~1 1 the pole faces will be formed;
2 Fig. 5 is a perspective view of the blank of Fig. 4 3 after the magnetic discontinuities or teeth of the pole faces 4 have been ~ormed;
Fig. 6 is a perspective view of the ring of Fig. 5 6 after adhesive bonding to the pole structure of Fig. 3;
7 Fig. 7 is a perspective view of the structure of 8 Fig. 6 after the ring has been cut so as to form separate pole 9 faces;
Fig. 8 is a plan view of the pole faces of Fig. 7;
11 Fig. 9 is a side view of the pole structure of Fig.
12 8;
13 Fig. 10 is a sectional view of the pole structure of 14 Fig. 8 taken along line lO-10 thereof in combination with addi-tional magnetic structure including a rotor and an inactive 16 stator portion;
17 Fig. ll is a perspective view of an alternative 18 method of fabricating the pole structure of Figs. l-lO; and l9 Fig. 12 is a perspective view of yet another altern-ative method of fabricating the pole structure of Figs. 1-10.
21 Detailed DescriPtion of Preferred ~mbodiments 22 Referring to Fig. 1, the annular member lO which is 23 adapted to form one portion of a stator pole structure for a 24 variable reluctance stepper motor is shown. The annular mem-ber 10 comprises a high permeability magnetic material, e.g., 26 iron, in the form of a plurality of laminations 12 which may 27 be wound in the form of a coil as shown in Fig. la.
28 In Fig. 2, the annular member 10 is being ground by 29 a crush grinding wheel 14 so as to preform pole members 16.
The pole members 16 are ground from the member 10 to a depth 31 so as to leave a continuous annular support segment 18.
32 In accordance with this invention and as shown in 33 Fig. 3, the pole structure as formed in Fig. 2 is now ready 34 for application of the windings of the variable stepper motor.
As shown in Fig. 3, one of these windings 20 is preformed on ~129~7~
1 a bobbin 22 having an opening 24 therein so as to be placed 2 down over the pole members 16. In this regard, it will be 3 noted that the pole members 16 are of substantially uniform 4 cross-sectional area so as to permit the pole members 16 to freely pass through the opening 24 and substantially conform 6 with the area of that opening. Having now described the for-7 mation of the one portion of the stator pole structure with 8 reference to Figs. 1-3, the formation of the pole face portion 9 of the stator structure will now be described with reference to Figs. 4 and 5.
11 As shown in Fig. 4, a continuous member or ring 26 12 is provided. This ring which is also formed from a high per-13 meability magnetic material is adapted to have discrete mag-14 netic discontinuities in the form of teeth 28 as shown in Fig.
5 formed therein. The teeth 28, as shown in Fig. 5, are 16 located at four different pole face positions. The exact 17 location of the teeth 28 in accordance with stepper motor de-18 sign may be readily achieved by utilizing a coining or electro-19 chemical etching technique to form the teeth 28.
In accordance with this invention, the ring 26 with 21 the teeth 28 is then a & esively bonded to one end of the pole 22 members aæ shown in Fig. 6 with the winding 20 already on the 23 pole members as a result of the step shown in Fig. 3. It is 24 important to appropriately place the teeth 28 at the various pole positions with respect to the pole members enclosed with-26 in ~he windings 20 in accordance with standard stepper motor 27 design techniques. The ad~esive bonding agent may comprise 28 an epoxy resin or other agent capable of assuring an appropri-29 ate bonding strength without substantially affecting the flux paths.
31 After the ring 26 is adhesively bonded to the pole 32 members, the individual pole faces 30 are formed in the ring 33 by cutting the ring at four different locations between the 34 pole members and the windings 20. This cutting of the ring 26 may be achieved by grinding.
47~L
Reference will now be made to Figs. 8-10 for a description of the stator pole construction of Figs. 1-8 in a variable reluctance stepper motor. As shown in Figs. 8 and 9 twithout the rotor or the inactive stator portion), the motor includes a sleeve 32 having a flange 34 attached to the segment 18 of the pole structure. Referring to Fig. 10, the sleeve 32 includes a bearing support area 36 which is adapted to receive a shaft which supports a rotor 38 in the stator-to-stator air gap 40 between the pole faces 30 and an inactive stator portion 42 having similar pole faces 44. For more de-tails concerning the actual stepper motor assem~ly, reference is made to copending Canadian Patent Application 303,683, filed May 18, 1978 and to U. S. Patent No. 4,198,582 granted April 15, 1980 on an application filed in the United States on June 24, 1977.
In the embodiment of Figs. 1-8, the pole members were ground from an annular laminated structure and the pole faces were adhesively bonded to the pole members so formed.
In Fig. 11, the pole members 16a are integrally formed with the pole faces 30a having teeth 28a at one end and the other end of the pole members 16a are adhesively bonded to an annu-lar support segment 18a. In Fig. 12, the pole mem~ers 16b are adhesively bonded to the pole faces 30b as well as an annular support segment 18b at both ends thereof.
As shown in both Figs. 11 and 12, the pole faces 30a and 30b are individually and separately formed and do not form a continuous ring as shown in Fig. 6. It will, however, be appreciated that the pole faces 30a and 30b may be formed in a continuous ring and severed after the adhesive bonding is completed.
Although the invention has been described in terms of a pole structure for the stator of a rotary stepper motor, it will be understood that the method and the product formed by the method is equally applicable where the pole structure forms a moving member in the stepper motor and/or the motor is B
linear rather than rotary. In other words, this invention is equally applicable to moving or stationary pole structures and/or linear or rotary stepper motors.
Various stepper motors of various designs which could benefit from the principles of this invention are dis-closed in a book entitled "Theory and Applications of Step Motors" by Benjamin C. Kuo, West Publishing Co., 1974. Ref-erence is also made to this book for a full and complete ex-planation of the manner in which stepper motors operate.
Although particular embodiments of the invention have been shown and described, it will be appreciated that other embodiments and modifications will occur to those of ordinary skill in the art and such embodiments and modifi-cations will fall within the true spirit and scope of the in-vention as set forth in the appended claims.
~'
In accordance with this invention, the ring 26 with 21 the teeth 28 is then a & esively bonded to one end of the pole 22 members aæ shown in Fig. 6 with the winding 20 already on the 23 pole members as a result of the step shown in Fig. 3. It is 24 important to appropriately place the teeth 28 at the various pole positions with respect to the pole members enclosed with-26 in ~he windings 20 in accordance with standard stepper motor 27 design techniques. The ad~esive bonding agent may comprise 28 an epoxy resin or other agent capable of assuring an appropri-29 ate bonding strength without substantially affecting the flux paths.
31 After the ring 26 is adhesively bonded to the pole 32 members, the individual pole faces 30 are formed in the ring 33 by cutting the ring at four different locations between the 34 pole members and the windings 20. This cutting of the ring 26 may be achieved by grinding.
47~L
Reference will now be made to Figs. 8-10 for a description of the stator pole construction of Figs. 1-8 in a variable reluctance stepper motor. As shown in Figs. 8 and 9 twithout the rotor or the inactive stator portion), the motor includes a sleeve 32 having a flange 34 attached to the segment 18 of the pole structure. Referring to Fig. 10, the sleeve 32 includes a bearing support area 36 which is adapted to receive a shaft which supports a rotor 38 in the stator-to-stator air gap 40 between the pole faces 30 and an inactive stator portion 42 having similar pole faces 44. For more de-tails concerning the actual stepper motor assem~ly, reference is made to copending Canadian Patent Application 303,683, filed May 18, 1978 and to U. S. Patent No. 4,198,582 granted April 15, 1980 on an application filed in the United States on June 24, 1977.
In the embodiment of Figs. 1-8, the pole members were ground from an annular laminated structure and the pole faces were adhesively bonded to the pole members so formed.
In Fig. 11, the pole members 16a are integrally formed with the pole faces 30a having teeth 28a at one end and the other end of the pole members 16a are adhesively bonded to an annu-lar support segment 18a. In Fig. 12, the pole mem~ers 16b are adhesively bonded to the pole faces 30b as well as an annular support segment 18b at both ends thereof.
As shown in both Figs. 11 and 12, the pole faces 30a and 30b are individually and separately formed and do not form a continuous ring as shown in Fig. 6. It will, however, be appreciated that the pole faces 30a and 30b may be formed in a continuous ring and severed after the adhesive bonding is completed.
Although the invention has been described in terms of a pole structure for the stator of a rotary stepper motor, it will be understood that the method and the product formed by the method is equally applicable where the pole structure forms a moving member in the stepper motor and/or the motor is B
linear rather than rotary. In other words, this invention is equally applicable to moving or stationary pole structures and/or linear or rotary stepper motors.
Various stepper motors of various designs which could benefit from the principles of this invention are dis-closed in a book entitled "Theory and Applications of Step Motors" by Benjamin C. Kuo, West Publishing Co., 1974. Ref-erence is also made to this book for a full and complete ex-planation of the manner in which stepper motors operate.
Although particular embodiments of the invention have been shown and described, it will be appreciated that other embodiments and modifications will occur to those of ordinary skill in the art and such embodiments and modifi-cations will fall within the true spirit and scope of the in-vention as set forth in the appended claims.
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Claims (22)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of fabricating a pole structure for a stepper motor comprising a plurality of poles having a plurality of magnetic discontintuities at a plurality of pole faces, the method comprising the following steps:
Forming one portion of a pole structure in-cluding windings wrapped around pole members on said pole structure; and adhesively bonding another portion of said pole structure to said one portion of said pole structure.
Forming one portion of a pole structure in-cluding windings wrapped around pole members on said pole structure; and adhesively bonding another portion of said pole structure to said one portion of said pole structure.
2. The method of claim 1 wherein said windings are wrapped around said pole members such that the axes of said wingings extend in substantially parallel directions.
3. The method of claim 1 wherein said pole members at one end thereof are adhesively bonded to said ocher port on
4. The method of claim 3 wherein said pole members comprise a substantially uniform cross-sectional area.
5. The method of claim 1 wherein said one portion is formed by preforming said windings and placing said preformed windings over said pole members.
6. The method of claim 1 wherein said ocher portion includes said plurality of pole faces
7. The method of claim 6 wherein said step of forming said one portion includes the step of grinding a blank to form said pole members.
8. The method of claim 6 wherein said plurality of said pole members are formed by grinding said blank and said plurality of faces are adhesively secured to said pole members.
9. The method of claim 8 wherein said plurality of pole faces are formed by cutting a continuous member into said plurality of pole faces
10. The method of claim 9 wherein said magnetic dis-continuities are formed in said continuous member before cutting.
11. The method of claim 1 wherein said pole members are also adhesively bonded to a support member.
12. The method of claim 1 wherein said windings are placed on said pole members before said pole members are adhesively bonded to a support member.
13. The method of claim 12 wherein said pole members are adhesively bonded to said ocher portion before said pole members are adhesively bonded to said support member.
14. The method of claim 12 wherein said pole members are adhesively bonded to said support member before said pole members are adhesively bonded to said ocher portion.
15. The method of claim 12 wherein said stepper motor is of the rotary type and said one portion and said other portion are annular in configuration.
16. A stepper motor comprising a pole structure including:
a common magnetic support segment;
a plurality of magnetic pole members;
wingings wrapped around said pole members; and a plurality of pole faces including magnetic discontinuities;
said support portion, said magnetic pole members and said pole faces forming a plurality of flux paths, at least one of said flux paths including an adhesive bond in said pole structure.
a common magnetic support segment;
a plurality of magnetic pole members;
wingings wrapped around said pole members; and a plurality of pole faces including magnetic discontinuities;
said support portion, said magnetic pole members and said pole faces forming a plurality of flux paths, at least one of said flux paths including an adhesive bond in said pole structure.
17. The stepper motor of claim 16 including an adhesive bond in each of said flux paths.
18. The stepper motor of claim 17 wherein each said adhesive bond is located between said pole faces and said pole members.
19. The stepper motor of claim 18 including additional adhesive bonds in each of said flux paths between said support segment and said pole members.
20. The stepper motor of claim 19 wherein each said adhesive bond is located in said flux paths.
21. The stepper motor of claim 20 wherein said motor is of the rotary type and said pole structure forms a stator, said motor further comprising another stator portion having magnetic discontinuities juxtaposed to said pole faces to form an air gap.
22. The stepper motor of claim 21 wherein said air gap is axially disposed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94540978A | 1978-09-25 | 1978-09-25 | |
| US945,409 | 1978-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1129471A true CA1129471A (en) | 1982-08-10 |
Family
ID=25483049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA336,217A Expired CA1129471A (en) | 1978-09-25 | 1979-09-24 | Adhesively bonded stator for stepper motor and method of manufacture |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5546867A (en) |
| AU (1) | AU5108179A (en) |
| BE (1) | BE878933A (en) |
| BR (1) | BR7906038A (en) |
| CA (1) | CA1129471A (en) |
| DE (1) | DE2932490A1 (en) |
| FR (1) | FR2437098A1 (en) |
| GB (1) | GB2034532B (en) |
| IT (1) | IT1123293B (en) |
| NL (1) | NL7907136A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4765054A (en) * | 1983-08-11 | 1988-08-23 | Black & Decker, Inc. | Method of making a field subassembly |
| JPH0733585Y2 (en) * | 1987-10-13 | 1995-07-31 | トヨタ自動車株式会社 | Rotary actuator |
| US5168187A (en) * | 1991-02-20 | 1992-12-01 | Dana Corporation, Warner Electric Brake & Clutch Division | Axial pole stepping motor |
| GB2379093A (en) * | 2001-08-22 | 2003-02-26 | Chia-Hao Fan | Side rotation (axial) type motor/dynamo |
| JP4712465B2 (en) * | 2005-07-20 | 2011-06-29 | ヤマハ発動機株式会社 | Rotating electric machine and electric wheelchair |
| DE102007035169A1 (en) * | 2007-07-27 | 2009-01-29 | Siemens Ag | Primary part with bonded pole teeth |
| EP4142125A1 (en) * | 2021-08-26 | 2023-03-01 | Universidad de Alcalá (UAH) | Miniaturized electromagnetic rotary actuator |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3226584A (en) * | 1960-06-10 | 1965-12-28 | Intron Int Inc | Induced-quadrature field synchronous motor |
| NL143389B (en) * | 1965-01-13 | 1974-09-16 | Philips Nv | STEPPER MOTOR SWITCHABLE TO ASYNCHRONOUS OPERATION. |
| FR1568400A (en) * | 1968-04-11 | 1969-05-23 | ||
| US3474272A (en) * | 1968-05-09 | 1969-10-21 | Mesur Matic Electronics Corp | Wobbling rotor step motor with stator coils and pole arrangement |
| US3539847A (en) * | 1968-10-18 | 1970-11-10 | John F Gifford | Nutating step motor for ac or pulse operation |
| DE1914531A1 (en) * | 1969-03-21 | 1970-11-05 | Beteiligungs Ag Haustechnik | Electric rotary machine |
| US3585426A (en) * | 1969-10-06 | 1971-06-15 | Mesur Matic Electronics Corp | Vibration compensation for wobble plate step motors |
| CH536043A (en) * | 1970-12-28 | 1973-04-15 | Fujitsu Ltd | Electric pulse motor |
| GB1368788A (en) * | 1970-12-28 | 1974-10-02 | Gujitsu Ltd | Electric stepping motor |
| AT320064B (en) * | 1971-09-17 | 1975-01-27 | Ludwig Ludin Dipl Ing | Stator for electric rotary machine |
| AU6012173A (en) * | 1972-09-14 | 1975-03-13 | Koike Seiki K K | Diaphragm-assisted exposure control device and electro- magnetic rotary motion device |
| JPS4956110A (en) * | 1972-09-29 | 1974-05-31 | ||
| US4198582A (en) * | 1977-06-24 | 1980-04-15 | Exxon Research & Engineering Co. | High performance stepper motor |
-
1979
- 1979-08-10 DE DE19792932490 patent/DE2932490A1/en active Granted
- 1979-09-21 IT IT25937/79A patent/IT1123293B/en active
- 1979-09-21 AU AU51081/79A patent/AU5108179A/en not_active Abandoned
- 1979-09-21 BE BE0/197265A patent/BE878933A/en not_active IP Right Cessation
- 1979-09-21 BR BR7906038A patent/BR7906038A/en unknown
- 1979-09-24 CA CA336,217A patent/CA1129471A/en not_active Expired
- 1979-09-24 FR FR7923735A patent/FR2437098A1/en active Granted
- 1979-09-25 NL NL7907136A patent/NL7907136A/en not_active Application Discontinuation
- 1979-09-25 GB GB7933186A patent/GB2034532B/en not_active Expired
- 1979-09-25 JP JP12216579A patent/JPS5546867A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2932490A1 (en) | 1980-04-03 |
| FR2437098B1 (en) | 1983-11-10 |
| IT1123293B (en) | 1986-04-30 |
| NL7907136A (en) | 1980-03-27 |
| GB2034532B (en) | 1983-03-30 |
| BR7906038A (en) | 1980-07-08 |
| JPS5546867A (en) | 1980-04-02 |
| IT7925937A0 (en) | 1979-09-21 |
| FR2437098A1 (en) | 1980-04-18 |
| DE2932490C2 (en) | 1988-11-17 |
| AU5108179A (en) | 1980-04-03 |
| BE878933A (en) | 1980-03-21 |
| GB2034532A (en) | 1980-06-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |