CA2177326A1 - Stator lamination notching apparatus - Google Patents
Stator lamination notching apparatusInfo
- Publication number
- CA2177326A1 CA2177326A1 CA 2177326 CA2177326A CA2177326A1 CA 2177326 A1 CA2177326 A1 CA 2177326A1 CA 2177326 CA2177326 CA 2177326 CA 2177326 A CA2177326 A CA 2177326A CA 2177326 A1 CA2177326 A1 CA 2177326A1
- Authority
- CA
- Canada
- Prior art keywords
- motor
- turntable
- notching
- indexing
- servo
- 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.)
- Abandoned
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- Manufacture Of Motors, Generators (AREA)
Abstract
The invention is a stator lamination notching apparatus. The apparatus includes an indexing servo motor and is controlled by a programmable servo controller. The motor is a vertical output motor which is directly coupled to the turntable which is directly coupled to the output shaft of the motor without the need for gears. Further, the notching preformed by the apparatus is precisely controlled by a PSC which controls the indexing of the turntable used to support the stator lamination. Further, the stator lamination notching apparatus includes a direct drive between the turntable and the servo motor.
Description
.
Docket No. 533809.027 PATENT
STATOR LAMINATION NOL~1NG APPARATUS
Background of the Invention The present invention relates to devices for stamping notches in a stator lamination for an electric motor, and more particularly, to full-automated stamping devices having an indexing servo motor.
Typically, large electric motors include a cylindrical stator core which is composed of a stack of relatively thin, annular laminations made of a conductive metal such as copper. Longitudinal grooves are formed to extend along the interior surface of the stator core by notching the inner peripheries of each of the laminations which are aligned when the laminations are arranged in a stack and rods are inserted through locating holes formed in each lamination. Coils or rods formed from several insulated wires (windings) are secured in such grooves. The notches typically are formed by placing a stator lamination, which has a central opening already formed, over a spindle or hub on a turntable which indexes the lamination between a -reciprocating die set which forms the notches. An exemplary stator lamination jig system is disclosed in copending United States Serial No. 08/368,917, filed January 5, 1995, the disclosure of which is incorporated herein by reference.
Sometimes it is desired to skew the slot axes relative to the stack axis. In this instance each lamination is indexed a predetermined angular increment relative to the preceding laminate so that when arranged in a stack so that the locating holes are aligned, the axis of `` 21 77326 Docket No. 533809.027 each groove is skewed or spiraled relative to the centra axis of the stack. The amount of indexing has been achieved by manually operated clamps and a manually adjusted stop which controls the degree of travel in each rotation.
In another notching apparatus, a motor drives such a laminate supporting turntable. The motor has a horizontal output and includes a gear box to connect the motor to the turntable. However, due to the inaccuracy of the manual adjustments of the gears, loss of precision and/or excessive adjustment time results.
Accordingly, there is a need for an apparatus which accurately indexes the turntable for notching of a stator lamination. Further, there is a need for accurately controlling a stator lamination indexing mechanism.
Summary of the Invention The present invention is a stator lamination notching apparatus for notching the interior periphery of a stator lamination. In a preferred embodiment of the invention, the apparatus includes a servo motor which selectively indexes a laminate supporting turntable. A
direct drive links the servo motor to the turntable. The invention also includes a vertical output motor thereby eliminating the need for a gearing system. Further, the apparatus includes a programmable servo controller for accurately controlling the indexing servo motor.
Accordingly, it is an object of the present invention to provide a stator lamination notching apparatus in which less gearing is required and, therefore, loss of ` - 21 77326 Docket No. 533809.027 precision from gear lock is minimized; a system which is relatively easy to operate; and a system in which is likely accurate and indexed by a computer control.
Other objects and advantages of the present invention will be apparent from the following description, the accompanying drawings and the appended claims.
Brief Description of the Drawings Fig. 1 is a side elevational section of a ! preferred embodiment of the stator lamination notching apparatus of the present invention; and Fig. 2 is a schematic diagram of the operation of the programmable control.
Detailed Description As shown in Fig. 1, a stator lamination notching apparatus, generally designated 10, is mounted on a work table 11. In accordance with the present invention, the apparatus 10 includes an indexing jig assembly 12 situated above the worktable 11 and a motor assembly 14 situated below the worktable. The apparatus 10 is adjustably bolted to the work table 11.
The indexing jig assembly 12 includes an air actuated support turntable 16 including a drive plate 18 for supporting a stator lamination 20 thereon. The lamination 20 is shown and described in U.S. Application Serial No.
08/369,097 filed 1/05/95, the disclosure of which is incorporated within by reference. A generally circular hold-down plate 22 secures the lamination 20 on the Docket No. 533809.027 turntable 16 from the top. The hold down plate 22 includes inner 24 and outer 26 annular ridges to provide minimal contact with the stator lamination 20. The indexing jig assembly 12 also includes an upper assembly including a stamping mechanism (not shown) and a substantially circular plate 28 having a plurality of ejection cylinders 30 slidably supported thereon for removing the lamination 20 after the stamping operation is complete. A cylinder 31 controls the action of the ejection cylinders 30 on the ejection plate 28. The indexing mechanism is capable of rotating the turntable 16 a full 360 and can make up to 1,024,000 counts for high precision in notching.
The top assembly 12 further includes a bracket 32 which includes a bushing 34 that rotably receives a shaft 36 which is attached to the hold down plate 22. The shaft 36 is journaled into the bushing 34 and includes an enlarged head 38 which prevents the shaft from sliding downwardly through the bushing.
The turntable 16 is directly driven by the motor assembly 14 which includes an indexing motor 40. The motor 40 is a vertical output motor and is coupled directly without gears to an output shaft 42 which extends vertically through the turntable 16 and engages the drive plate 18 to act as the spindle for the turntable during the indexing process which forms the notches in the lamination 20. A pin 50 is inserted within the output shaft 42 for attachment of the outer rotating bushing 44 with the shaft 42. The indexing motor 40 is therefore responsible for rotating the output shaft 42 and providing power to the indexing mechanism. Further, the output shaft 42 is coupled directly without gears to the turntable 16.
Docket No. 533809.027 The motor 40 is preferably an indexing servo motor which indexes along with the turntable. An important aspect of this invention is that the servo motor and the turntable are coupled directly to each other without the use of gears.
This allows a reduction in heat build up which is generally encountered when dealing with gearing, the elimination of gear lash, an increase in accuracy, reliability and control, and a decrease in the cost of the apparatus when compared with apparatuses which including gearing. Preferably, the motor 40 and the drive shaft 42 are vertically coupled by a direct drive.
The shaft 42 is situated within a bearing housing 44 and includes tapered roller bearings 46, 48 for easier rotation of the shaft 42 within the housing 44.
A button 52 and a stationary sensor 54 are included for accurately determining the home position. The button 52 rotates with the outer bushing 44 and works in combination with the stationary sensor 54 which is attached to the servo controller 80 to set the apparatus in the home position. In addition, the controller can precisely determine the distance from home position during initialization, as well as during the notching process, and can determine when the motor has indexed a full 360 to complete its rotation.
An outside spindle 56 is rotatively mounted on the motor 40 and rotates with the outer bushing 44. Therefore, the spindle 56, bushing 44, and turntable 16 all index together by action of the indexing servo motor 40.
Docket No. 533809.027 Further, the motor 40 is supported on two U-shaped motor supports 58,60 and a non-rotating rotor mounting plate 62. A servo controller 80 is connected to the motor on its bottom end.
The whole turntable 12 and motor assembly 16 making up the apparatus 10 are capable of lateral movement within the worktable 11. A motor support slide 62 slides within a slot 64. When it is determined that they are in the correct position, they are affixed to the table 11 by two bolts 66, 68. A wedge block can be used to vary the height of the assembly 10 to the workpiece 20 to be notched.
Then adjustment screws are used to adjust the left/right movement.
A servo controller 80, in the form of a programmable servo controller (PSC), is used for controlling the indexing motor 14 with precision. The PSC 80 is connected to the motor 40 and the sensor 54 and controls the indexing of the table 18, the speed of indexing, and the size of the notches as will be explained hereinbelow. The sensor 54 associated with the PSC 80 senses and determines the current position of the indexing means and aligns the table 16 in a predetermined home position. Then the PSC 80 signals the completion of the notching of the laminate 20.
The motor 40 further includes an encoder to read the instructions from the PSC 80.
Exemplary software which may be utilized for the computer control is the "Motion Architect" by Parker Hannifin Corp. which includes an operator interface. The operator can control how many holes to punch or slots to Docket No. 533809.027 punch in the lamination during the notching operation, as well as the acceleration/deceleration profile for controlling the speed of indexing. A number of stored programs could be utilized for preset conditions.
Otherwise, the operator can customize the program in order to select the number of notches or can program skips in the notching process.
A flow chart of the computer control 80 is shown in Fig. 2. First, the system is booted up 82. Then the operator selects the number of slots to be notched in the lamination 84. Next, the HOME position is selected 86. Or, in the alternative, a change in the offset from home can be selected during initialization, to align with other notches in the laminate. If HOME is chosen, the computer aligns the turntable at the home position 88. If OFFSET is chosen, the computer asks for the new offset position 90 and designates this new position as home 88. Then the ready light is activated 92 and the cycle can be started 94. If positioned correctly, the operator starts the system 96. If not, the operator can again alter the offset position 98.
Having described the invention in detail and by reference to preferred embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.
What is claimed is:
Docket No. 533809.027 PATENT
STATOR LAMINATION NOL~1NG APPARATUS
Background of the Invention The present invention relates to devices for stamping notches in a stator lamination for an electric motor, and more particularly, to full-automated stamping devices having an indexing servo motor.
Typically, large electric motors include a cylindrical stator core which is composed of a stack of relatively thin, annular laminations made of a conductive metal such as copper. Longitudinal grooves are formed to extend along the interior surface of the stator core by notching the inner peripheries of each of the laminations which are aligned when the laminations are arranged in a stack and rods are inserted through locating holes formed in each lamination. Coils or rods formed from several insulated wires (windings) are secured in such grooves. The notches typically are formed by placing a stator lamination, which has a central opening already formed, over a spindle or hub on a turntable which indexes the lamination between a -reciprocating die set which forms the notches. An exemplary stator lamination jig system is disclosed in copending United States Serial No. 08/368,917, filed January 5, 1995, the disclosure of which is incorporated herein by reference.
Sometimes it is desired to skew the slot axes relative to the stack axis. In this instance each lamination is indexed a predetermined angular increment relative to the preceding laminate so that when arranged in a stack so that the locating holes are aligned, the axis of `` 21 77326 Docket No. 533809.027 each groove is skewed or spiraled relative to the centra axis of the stack. The amount of indexing has been achieved by manually operated clamps and a manually adjusted stop which controls the degree of travel in each rotation.
In another notching apparatus, a motor drives such a laminate supporting turntable. The motor has a horizontal output and includes a gear box to connect the motor to the turntable. However, due to the inaccuracy of the manual adjustments of the gears, loss of precision and/or excessive adjustment time results.
Accordingly, there is a need for an apparatus which accurately indexes the turntable for notching of a stator lamination. Further, there is a need for accurately controlling a stator lamination indexing mechanism.
Summary of the Invention The present invention is a stator lamination notching apparatus for notching the interior periphery of a stator lamination. In a preferred embodiment of the invention, the apparatus includes a servo motor which selectively indexes a laminate supporting turntable. A
direct drive links the servo motor to the turntable. The invention also includes a vertical output motor thereby eliminating the need for a gearing system. Further, the apparatus includes a programmable servo controller for accurately controlling the indexing servo motor.
Accordingly, it is an object of the present invention to provide a stator lamination notching apparatus in which less gearing is required and, therefore, loss of ` - 21 77326 Docket No. 533809.027 precision from gear lock is minimized; a system which is relatively easy to operate; and a system in which is likely accurate and indexed by a computer control.
Other objects and advantages of the present invention will be apparent from the following description, the accompanying drawings and the appended claims.
Brief Description of the Drawings Fig. 1 is a side elevational section of a ! preferred embodiment of the stator lamination notching apparatus of the present invention; and Fig. 2 is a schematic diagram of the operation of the programmable control.
Detailed Description As shown in Fig. 1, a stator lamination notching apparatus, generally designated 10, is mounted on a work table 11. In accordance with the present invention, the apparatus 10 includes an indexing jig assembly 12 situated above the worktable 11 and a motor assembly 14 situated below the worktable. The apparatus 10 is adjustably bolted to the work table 11.
The indexing jig assembly 12 includes an air actuated support turntable 16 including a drive plate 18 for supporting a stator lamination 20 thereon. The lamination 20 is shown and described in U.S. Application Serial No.
08/369,097 filed 1/05/95, the disclosure of which is incorporated within by reference. A generally circular hold-down plate 22 secures the lamination 20 on the Docket No. 533809.027 turntable 16 from the top. The hold down plate 22 includes inner 24 and outer 26 annular ridges to provide minimal contact with the stator lamination 20. The indexing jig assembly 12 also includes an upper assembly including a stamping mechanism (not shown) and a substantially circular plate 28 having a plurality of ejection cylinders 30 slidably supported thereon for removing the lamination 20 after the stamping operation is complete. A cylinder 31 controls the action of the ejection cylinders 30 on the ejection plate 28. The indexing mechanism is capable of rotating the turntable 16 a full 360 and can make up to 1,024,000 counts for high precision in notching.
The top assembly 12 further includes a bracket 32 which includes a bushing 34 that rotably receives a shaft 36 which is attached to the hold down plate 22. The shaft 36 is journaled into the bushing 34 and includes an enlarged head 38 which prevents the shaft from sliding downwardly through the bushing.
The turntable 16 is directly driven by the motor assembly 14 which includes an indexing motor 40. The motor 40 is a vertical output motor and is coupled directly without gears to an output shaft 42 which extends vertically through the turntable 16 and engages the drive plate 18 to act as the spindle for the turntable during the indexing process which forms the notches in the lamination 20. A pin 50 is inserted within the output shaft 42 for attachment of the outer rotating bushing 44 with the shaft 42. The indexing motor 40 is therefore responsible for rotating the output shaft 42 and providing power to the indexing mechanism. Further, the output shaft 42 is coupled directly without gears to the turntable 16.
Docket No. 533809.027 The motor 40 is preferably an indexing servo motor which indexes along with the turntable. An important aspect of this invention is that the servo motor and the turntable are coupled directly to each other without the use of gears.
This allows a reduction in heat build up which is generally encountered when dealing with gearing, the elimination of gear lash, an increase in accuracy, reliability and control, and a decrease in the cost of the apparatus when compared with apparatuses which including gearing. Preferably, the motor 40 and the drive shaft 42 are vertically coupled by a direct drive.
The shaft 42 is situated within a bearing housing 44 and includes tapered roller bearings 46, 48 for easier rotation of the shaft 42 within the housing 44.
A button 52 and a stationary sensor 54 are included for accurately determining the home position. The button 52 rotates with the outer bushing 44 and works in combination with the stationary sensor 54 which is attached to the servo controller 80 to set the apparatus in the home position. In addition, the controller can precisely determine the distance from home position during initialization, as well as during the notching process, and can determine when the motor has indexed a full 360 to complete its rotation.
An outside spindle 56 is rotatively mounted on the motor 40 and rotates with the outer bushing 44. Therefore, the spindle 56, bushing 44, and turntable 16 all index together by action of the indexing servo motor 40.
Docket No. 533809.027 Further, the motor 40 is supported on two U-shaped motor supports 58,60 and a non-rotating rotor mounting plate 62. A servo controller 80 is connected to the motor on its bottom end.
The whole turntable 12 and motor assembly 16 making up the apparatus 10 are capable of lateral movement within the worktable 11. A motor support slide 62 slides within a slot 64. When it is determined that they are in the correct position, they are affixed to the table 11 by two bolts 66, 68. A wedge block can be used to vary the height of the assembly 10 to the workpiece 20 to be notched.
Then adjustment screws are used to adjust the left/right movement.
A servo controller 80, in the form of a programmable servo controller (PSC), is used for controlling the indexing motor 14 with precision. The PSC 80 is connected to the motor 40 and the sensor 54 and controls the indexing of the table 18, the speed of indexing, and the size of the notches as will be explained hereinbelow. The sensor 54 associated with the PSC 80 senses and determines the current position of the indexing means and aligns the table 16 in a predetermined home position. Then the PSC 80 signals the completion of the notching of the laminate 20.
The motor 40 further includes an encoder to read the instructions from the PSC 80.
Exemplary software which may be utilized for the computer control is the "Motion Architect" by Parker Hannifin Corp. which includes an operator interface. The operator can control how many holes to punch or slots to Docket No. 533809.027 punch in the lamination during the notching operation, as well as the acceleration/deceleration profile for controlling the speed of indexing. A number of stored programs could be utilized for preset conditions.
Otherwise, the operator can customize the program in order to select the number of notches or can program skips in the notching process.
A flow chart of the computer control 80 is shown in Fig. 2. First, the system is booted up 82. Then the operator selects the number of slots to be notched in the lamination 84. Next, the HOME position is selected 86. Or, in the alternative, a change in the offset from home can be selected during initialization, to align with other notches in the laminate. If HOME is chosen, the computer aligns the turntable at the home position 88. If OFFSET is chosen, the computer asks for the new offset position 90 and designates this new position as home 88. Then the ready light is activated 92 and the cycle can be started 94. If positioned correctly, the operator starts the system 96. If not, the operator can again alter the offset position 98.
Having described the invention in detail and by reference to preferred embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.
What is claimed is:
Claims (20)
1. A stator lamination notching apparatus comprising:
a turntable for supporting a workpiece during a notching operation;
an indexing mechanism for indexing said turntable; and a servo motor for providing power to said indexing mechanism, wherein said servo motor is coupled directly to said turntable.
a turntable for supporting a workpiece during a notching operation;
an indexing mechanism for indexing said turntable; and a servo motor for providing power to said indexing mechanism, wherein said servo motor is coupled directly to said turntable.
2. The apparatus of claim 1 wherein said servo motor and said turntable are coupled by a direct drive.
3. The method of claim 2 wherein said direct drive includes an output shaft connected to said motor and said turntable.
4. The apparatus of claim 1 further comprising a servo controller in the form of a programmable servo controller for controlling said servo motor and said indexing mechanism with precision.
5. The apparatus of claim 4 further including a sensor associated with said programmable servo controller for sensing and determining the current position of indexing mechanism and aligning said turntable in a predetermined position.
6. The apparatus of claim 1 wherein said motor is a vertical output motor.
7. The apparatus of claim 1 wherein said turntable is mounted on a centrally located spindle and said servo motor is coupled directly to said spindle.
8. The apparatus of claim 7 wherein said spindle is an output shaft for said servo motor.
9. The apparatus of claim 7 wherein said motor includes an outer bushing which rotates around said motor.
10. The apparatus of claim 3 further comprising an encoder for said motor.
11. The apparatus of claim 1 wherein said indexing mechanism is capable of rotating in 1,024,000 counts for precise movement.
12. The apparatus of claim 8 wherein said bushing, said spindle, said turntable are connected so that they are capable of rotating together by action of the motor.
13. The apparatus of claim 1 wherein said turntable and said motor are positioned within a work table.
14. The apparatus of claim 12 further comprising a motor support slide and wherein the notching apparatus is capable of lateral movement within said work table.
15. A stator lamination notching apparatus comprising:
a turntable for supporting a workpiece during a notching operation;
an indexing mechanism for indexing said turntable; and a servo motor for providing power to said indexing mechanism, wherein said servo motor is coupled directly to said turntable by a direct drive;
a servo controller in the form of a programmable servo controller for controlling said servo motor and said indexing mechanism with precision; and a sensor associated with said programmable servo controller for sensing and determining the current position of the indexing means and aligning said turntable in a predetermined position;
wherein said turntable is mounted on a centrally located spindle and said servo motor is coupled directly to said spindle.
a turntable for supporting a workpiece during a notching operation;
an indexing mechanism for indexing said turntable; and a servo motor for providing power to said indexing mechanism, wherein said servo motor is coupled directly to said turntable by a direct drive;
a servo controller in the form of a programmable servo controller for controlling said servo motor and said indexing mechanism with precision; and a sensor associated with said programmable servo controller for sensing and determining the current position of the indexing means and aligning said turntable in a predetermined position;
wherein said turntable is mounted on a centrally located spindle and said servo motor is coupled directly to said spindle.
16. The apparatus of claim 14 wherein said indexing mechanism is capable of rotating in 1,024,000 counts for precise movement.
17. The apparatus of claim 14 wherein said motor includes an outer bushing which rotates around said motor.
18. The apparatus of claim 16 wherein said bushing, said spindle, said turntable are connected so that they are capable of rotating together by action of the motor.
19. The apparatus of claim 17 wherein said turntable and said motor are positioned within a work table.
20. The apparatus of claim 18 further comprising a motor support slide and wherein the notching apparatus is capable of lateral movement within said work table.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US49112395A | 1995-06-06 | 1995-06-06 | |
| US08/491,123 | 1995-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2177326A1 true CA2177326A1 (en) | 1996-12-07 |
Family
ID=23950885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2177326 Abandoned CA2177326A1 (en) | 1995-06-06 | 1996-05-24 | Stator lamination notching apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2177326A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505401A (en) * | 2022-04-19 | 2022-05-17 | 南通森玛特电机有限公司 | Stator slot notching equipment with equidistant marking function for three-phase motor machining |
-
1996
- 1996-05-24 CA CA 2177326 patent/CA2177326A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505401A (en) * | 2022-04-19 | 2022-05-17 | 南通森玛特电机有限公司 | Stator slot notching equipment with equidistant marking function for three-phase motor machining |
| CN114505401B (en) * | 2022-04-19 | 2022-06-28 | 南通森玛特电机有限公司 | Stator slot notching equipment with equidistant marking function for three-phase motor machining |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |