CA1173887A - Commutator device for small electric motors - Google Patents
Commutator device for small electric motorsInfo
- Publication number
- CA1173887A CA1173887A CA000408560A CA408560A CA1173887A CA 1173887 A CA1173887 A CA 1173887A CA 000408560 A CA000408560 A CA 000408560A CA 408560 A CA408560 A CA 408560A CA 1173887 A CA1173887 A CA 1173887A
- Authority
- CA
- Canada
- Prior art keywords
- commutator
- terminal portion
- portions
- terminal
- local
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/32—Connections of conductor to commutator segment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/02—Soldered or welded connections
Landscapes
- Motor Or Generator Current Collectors (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
- Switches With Compound Operations (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
SPECIFICATION
TITLE OF THE INVENTION:
COMMUTATOR DEVICE FOR SMALL ELECTRIC MOTORS
ABSTRACT OF THE DISCLOSURE:
A commutator device for small electric motors having commu-tator segments comprising circular-arc-shaped commutator portions and terminal portions standing upright from the commutator port-ions; the commutator portions being mounted on an insulating cylinder, and the terminal portions being bent to hold armature winding lead wires; wherein each of the terminal portions has a narrow portion at which the crosssectional area of the terminal portion in the direction perpendicular to the longitudinal direc-tion thereof is made smaller than the other portions thereof to permit the terminal portion to be easily heated when the lead wire is resistance welded to the terminal portion, the lead wire being held in position by bending the terminal portion at the narrow portion thereof and welded to the terminal portion.
TITLE OF THE INVENTION:
COMMUTATOR DEVICE FOR SMALL ELECTRIC MOTORS
ABSTRACT OF THE DISCLOSURE:
A commutator device for small electric motors having commu-tator segments comprising circular-arc-shaped commutator portions and terminal portions standing upright from the commutator port-ions; the commutator portions being mounted on an insulating cylinder, and the terminal portions being bent to hold armature winding lead wires; wherein each of the terminal portions has a narrow portion at which the crosssectional area of the terminal portion in the direction perpendicular to the longitudinal direc-tion thereof is made smaller than the other portions thereof to permit the terminal portion to be easily heated when the lead wire is resistance welded to the terminal portion, the lead wire being held in position by bending the terminal portion at the narrow portion thereof and welded to the terminal portion.
Description
7,`~ 37 BACKGROUND OF THE INVENTION:
This invention relates generally to a commutator device for small electric motors, and more particularly to a commutator device for small electric motors wherein each of commutator device terminal portions has a narrow portion at which the cross-sectional area of the terminal portion in the direction perpendicular to the longitudinal direction thereof is made smaller than the other portions thereof, and a lead wire of armature windings is held in position by bending the terminal portion at the narrow portion thereof and resistance welded to the terminal portion.
BRIEF DESCRIPTION OF THE DRAWINGS:
Fig. 1 is a side elevation illustrating an example of the commutator device and the armature for small prior art electric motors.
Fig. 2 (A) is a front view of a conventional type commutator device taken along line A-A of Fig. 1.
Fig. 2 (B) is a sectional side elevation taken along line B-B of Fig. 2 (A).
Fig. 2 (C) is a perspective view illustrating an example of a commutator segment used in the conventional type commutator device.
Fig. 3 is a sectional side elevation of assistance in explaininy the state where the lead wire is connected to the terminal portion by the fusing method in a conventional commutator device.
Fig. 4 is a development of assistance in explaining a commutator segment used in a commutator device embodying :'~7~
~17~38~
this invention.
Fig. 5 is a froni view of a commutator device embodying this invention (corresponding to Fig. 2, a front view of a conventional commutator device).
Fig. 6 is a sectional side elevation of a commutator device of assistance in explaining the state where the lead wire is connected to the terminal portion in this invention ~corresponding to Fig. 3).
In the Figures, reference numeral 1 designates a commutator device; 2 a commutator segment; 3 a commutator portion; 4 a terminal portion; 5 an armature; 6 an armature winding; 7 a lead wire; 8 an insulating cylinder; 9 an insulating flange; 10 an insulating washer, respectively.
As shown in Figs. 2 (A) and (B), the conventional type commutator device has such a construction that the commutator segment 2 shown in Fig. 2 (C) is disposed on - the insulating cylinder 8 and fixed in position by putting the insulating washer 10 onto the - 2a -commutator portion 3.
In small electric motors, the armature winding 6 is usually connected to the commutator segment 2 by wrapping tne lead wire 7 of the armature winding 6 around the terminal portion 4 provided on the commutator segment 2 and soldering thereto. Although this soldering method is a positive connecting method, the insulating cylinder 8 on which the commutator segment 2 is mounted is very i apt to be deformed due to the soldering heat since the insulating cylinder is commonly made of a thermally vulnerable synthetic resin. This may deteriorate the dimensional accuracy of the commu-tator device, affecting the performance of the motor. In addition, the soldering method has a number of disadvantages in terms of working efficiency, quality and manufacturing cost in that solder-ing involves a considerable degree of skill and several work steps and splashes of soldering flux often contaminate the inside of the motor. To overcome this problem, the fusing method, a type of resistance welding, has been devised and widely employed in conn-ecting the armature winding 6 to the commutator segment 2.
Fig. 3 is a sectional side elevation of a commutator device where the fusing method is employed to connect lead wires to commutator segments. In Fig. 3, the lead wire 7 drawn from the armature winding 6 is held in position by crimping the U-bend portion of the terminal portion 4, as shown in Fig. 1, and an electrode (not shown) is pressed from above the terminal portion to apply voltage across the terminal portion 4 and the commutator portion 3. The voltage thus applied causes current to flow in the terminal portion 4, whereby the terminal portion 4 is heated.
The heat so produced destroys an insulating film on the surface of the lead wire 7, exposing the core wire of the lead wire 7, and weld the lead wire 7 to the terminal portion 4. Thus the 3~S~7 lead wire 7 is held in position, crimped by the terminal portion 4, as shown in Fig. 3, and electrically connected to the terminal portion 4.
While the aforementioned process, called the fusing method, has an advantage of adaptability to automation, the electrical connection between the terminal portion 4 and the lead wire 7 achieved by the fusing method is less posi-tive, compared with the soldering method, because of the difficulty in bending, or crimping the terminal portion 4.
That is, the difficulty in bending the terminal portion 4 having a shape shown in Fig. 2 (C) to a sufficient radius may often result in poor contact, and accordingly poor weld-ing, between the lead wire 7 and the terminal portion 4.
This problem can be eliminated by increasing the current flowing in the terminal portion 4 and the pushing force of the electrode onto the terminal portion 4. This, however, may not only cause deformation in the insulating cylinder 8 or the insulating flange 9, as shown in Fig. 3 where a dent is found formed on the insulating flange 9 but also produce unwanted conditions such as the breakage of the lead wire 7.
Furthermore, various attempts have so far been made to improve the shortcomings of the fusing method, including setting the pushing force of the electrode on the terminal portion 4 and the current flowing in the terminal portion 4 at the optimum values, and using the electrode of the opti-mum shape. All these attempts involve the difficulty in the maintenance of the electrode resulting from rapid electrode consumption.
1~7~3887 SUMM~RY OF THE INVENTION:
It is an object of an aspect of this invention to provide a commutator device for small electric motors where-in the cross-sectional area of terminal portions is partially made smaller at positions at which lead wires are held in position so as to increase the electrical resistance thereof when the lead wires are welded to the terminal portions by the fusing method, whereby desired heat can be obtained at a small current value, and the area being heated can be limited to a relatively small area, with the consequence that poor electrical continuity between the terminal portion and the lead wire as well as the deformation of the insulating - cylinder due to welding heat can be prevented.
It is an object of an aspect of this invention to provide a commutator device for small electrical motors - wherein the width of the terminal portion is made partly narrower at a position to which the lead wire is being pressure weldèd so as to increase the electrical resistance thereof.
It is an object of an aspect of this invention to provide a commutator device for small electric motors wherein the thickness of the terminal portion is partially made thin-ner at a position to which the lead wire is pressure welded so as to increase the electrical resistance thereof.
Various aspects of this invention are as follows:
Commutator device for small electric motors comprising an insulating cylinder having an enlarged :Jl3L'73~38~
outer diameter portion, and commutator segments having circular-arc-shaped commutator portions and terminal portions standing upright from the commutator portions, the commutator portions being mounted in spaced relation to each other on the insulating cylinder such that the terminal portions are arranged in position on the enlarged diameter portion of the insulating cylinder and are bent at a corresponding local bending portion for holding thereat lead wires of armature windings, wherein each of the terminal portions has a corresponding local narrow portion at the local bending portion the cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is made smaller at such local bending portion than that of the remaining portions of such terminal portion, and the corresponding lead wire to be held thereat is held in position by bending the corresponding terminal portion at the local narrow portion thereof and by welding the lead wire to such terminal portion thereat by resistance welding under the pushing force of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
Method of holding lead wires of armature windings to commutator segments mounted on an insulating cylinder of a commutator device for small electric motors, in which the insulating cylinder has an enlarged outer diameter portion and the commutator segments have circular-arc-shaped commutator portions and terminal portions standing .,~
, ~
-5a-38~37 upright from the commutator portions, and in which the commutator portions are mounted in spaced relation to each other on the insulating cylinder such that the terminal portions are arranged in position on the enlarged diameter portion of the insulating cylinder and are bent at a corresponding local bending portion for holding thereat such lead wires, which comprises:
providing each of the terminal portions with a corresponding local narrow portion at the local bending portion, the local cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is smaller at such local bending portion than that of the remainder of such terminal portion, placing the corresponding lead wire to be held by the corresponding terminal portion at the local narrow portion thereof, and bending the terminal portion at the bending portion thereof to hold such lead wire thereat and welding the lead wire to such terminal portion thereat by resistance welding under the pushing force of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
These objects of the invention will become more apparent by referring to the following description and appended drawings.
DETAILED DESCRIPTION OF THE EMBODIMENT:
Like reference numerals designate like or correspond-. -6-73~87 ing parts throughout the Figures. Numeral 11 designates a narrow portion of the terminal portion 4.
A commutator segment 2 used in a commutator device embodying this invention has formed thereon a local narrow portion 11 by reducing the width of a part of a terminal portion 4 having a width a, as shown in Fig. 4, a development of the terminal portion 4. That is, the width b, or local cross-sectional area, i.e. in the direction perpendicular to the longitudinal direction of the corresponding terminal portion 4, of the local narrow portion 11 is narrower, or made smaller than the width a, or cross-sectional area, of the other parts or remaining portions or longitudinal remainder of the terminal portion 4. The terminal portion 4 is bent at a position shown by dotted lines in the Figure so as to allow it to stand upright with respect to the commutator portion 3, and further bent in a U-shape at a local bending portion at the position of the narrow portion 11, for holding thereat a corresponding lead wire 7, as in the case of the conventional type commutator device shown in Fig. 2 (C). In this case, the commutator portion 3 is of course bent in a circular arc shape so as to fit to the contour of the insulating cylinder 8, such that the commutator portion 3 is mounted longitudinally or axially along the main portion of the insulating cylinder 8 of normal outer diameter while the terminal portion 4 is arranged and maintained in position on the insulating flange 9 which forms an enlarged outer diameter portion as compared to the normal diameter of the insulating cylinder 8. The commutator device of this invention is constructed by assemb-;~73887 ling in the same manner as described referring to Figs.
1 and 2. A front view of the commutator device of this invention is shown in Fig. 5, wherein the commutator portions 3 are mounted in circumferentially or peripherally spaced apart relation to each other on the insulating cylinder 8. In this commutator device, the lead wire 7 is connected to the terminal portion 4, as shown in Fig. 6, by putting the lead wire 7 into the U-bend of the narrow portion 11 of the terminal portion 4 and causing current to flow while pushing the terminal portion 4 from above by an electrode (not shown), that is, by the fusing method, and such that the lead wire 7 is welded to the terminal portion 4 at the local narrow portion 11 by resistance welding under the pushing force or pressure of the welding electrode thereat while the terminal portion 4 is maintained in its so-arranged position on the enlarged diameter portion or insulating flange 9 of the insulating cylinder 8.
Figs. 4 through 6 show an embodiment where the width of the narrow portion 11 is made narrower than that of other parts of the terminal portion 4. This invention, however, is not limited to this configuration. Similar effects can be accomplished by forming the narrow portion by partially reducing the thickness of the terminal portion 4 in the across-the width direction of the terminal portion 4, though this configuration is not shown in the Figure.
As described above, the commutator device of this invention has the narrow portion 11 on the terminal portion 4. This causes the electrical resistance value at the narrow portion .~, .~,!
.~17~8~
ll to increase when an electric current flows in the terminal portion 4 during the aforementioned fusing method. Conse-quently, even when the current used in the fusing method is set at a smaller value than that used in the conventional method described referring to Figs. 2 and 3, desired welding heat can be obtained. This results in improved fusing conditions since the insulating film on the lead wire 7 is easily destroyed, improving the electrical contact thereof with the terminal portion 4. Furthermore, by providing the narrow portion ll, the terminal portion 4 can be easily bent into a U-shape, and the physical contact between the lead wire 7 and the terminal portion 4 can be improved.
Moreover, the provision of the narrow portion ll, which facilitates the U-bending of the terminal portion 4, helps reduce the pushing force of the electrode onto the terminal portion 4, as described above, and also helps concentrate the welding heat to the narrow portion 1~, preventing local temperature rise. This can prevent the deformation of the insulating cylinder 8 or local overheating.
_~_ ,
This invention relates generally to a commutator device for small electric motors, and more particularly to a commutator device for small electric motors wherein each of commutator device terminal portions has a narrow portion at which the cross-sectional area of the terminal portion in the direction perpendicular to the longitudinal direction thereof is made smaller than the other portions thereof, and a lead wire of armature windings is held in position by bending the terminal portion at the narrow portion thereof and resistance welded to the terminal portion.
BRIEF DESCRIPTION OF THE DRAWINGS:
Fig. 1 is a side elevation illustrating an example of the commutator device and the armature for small prior art electric motors.
Fig. 2 (A) is a front view of a conventional type commutator device taken along line A-A of Fig. 1.
Fig. 2 (B) is a sectional side elevation taken along line B-B of Fig. 2 (A).
Fig. 2 (C) is a perspective view illustrating an example of a commutator segment used in the conventional type commutator device.
Fig. 3 is a sectional side elevation of assistance in explaininy the state where the lead wire is connected to the terminal portion by the fusing method in a conventional commutator device.
Fig. 4 is a development of assistance in explaining a commutator segment used in a commutator device embodying :'~7~
~17~38~
this invention.
Fig. 5 is a froni view of a commutator device embodying this invention (corresponding to Fig. 2, a front view of a conventional commutator device).
Fig. 6 is a sectional side elevation of a commutator device of assistance in explaining the state where the lead wire is connected to the terminal portion in this invention ~corresponding to Fig. 3).
In the Figures, reference numeral 1 designates a commutator device; 2 a commutator segment; 3 a commutator portion; 4 a terminal portion; 5 an armature; 6 an armature winding; 7 a lead wire; 8 an insulating cylinder; 9 an insulating flange; 10 an insulating washer, respectively.
As shown in Figs. 2 (A) and (B), the conventional type commutator device has such a construction that the commutator segment 2 shown in Fig. 2 (C) is disposed on - the insulating cylinder 8 and fixed in position by putting the insulating washer 10 onto the - 2a -commutator portion 3.
In small electric motors, the armature winding 6 is usually connected to the commutator segment 2 by wrapping tne lead wire 7 of the armature winding 6 around the terminal portion 4 provided on the commutator segment 2 and soldering thereto. Although this soldering method is a positive connecting method, the insulating cylinder 8 on which the commutator segment 2 is mounted is very i apt to be deformed due to the soldering heat since the insulating cylinder is commonly made of a thermally vulnerable synthetic resin. This may deteriorate the dimensional accuracy of the commu-tator device, affecting the performance of the motor. In addition, the soldering method has a number of disadvantages in terms of working efficiency, quality and manufacturing cost in that solder-ing involves a considerable degree of skill and several work steps and splashes of soldering flux often contaminate the inside of the motor. To overcome this problem, the fusing method, a type of resistance welding, has been devised and widely employed in conn-ecting the armature winding 6 to the commutator segment 2.
Fig. 3 is a sectional side elevation of a commutator device where the fusing method is employed to connect lead wires to commutator segments. In Fig. 3, the lead wire 7 drawn from the armature winding 6 is held in position by crimping the U-bend portion of the terminal portion 4, as shown in Fig. 1, and an electrode (not shown) is pressed from above the terminal portion to apply voltage across the terminal portion 4 and the commutator portion 3. The voltage thus applied causes current to flow in the terminal portion 4, whereby the terminal portion 4 is heated.
The heat so produced destroys an insulating film on the surface of the lead wire 7, exposing the core wire of the lead wire 7, and weld the lead wire 7 to the terminal portion 4. Thus the 3~S~7 lead wire 7 is held in position, crimped by the terminal portion 4, as shown in Fig. 3, and electrically connected to the terminal portion 4.
While the aforementioned process, called the fusing method, has an advantage of adaptability to automation, the electrical connection between the terminal portion 4 and the lead wire 7 achieved by the fusing method is less posi-tive, compared with the soldering method, because of the difficulty in bending, or crimping the terminal portion 4.
That is, the difficulty in bending the terminal portion 4 having a shape shown in Fig. 2 (C) to a sufficient radius may often result in poor contact, and accordingly poor weld-ing, between the lead wire 7 and the terminal portion 4.
This problem can be eliminated by increasing the current flowing in the terminal portion 4 and the pushing force of the electrode onto the terminal portion 4. This, however, may not only cause deformation in the insulating cylinder 8 or the insulating flange 9, as shown in Fig. 3 where a dent is found formed on the insulating flange 9 but also produce unwanted conditions such as the breakage of the lead wire 7.
Furthermore, various attempts have so far been made to improve the shortcomings of the fusing method, including setting the pushing force of the electrode on the terminal portion 4 and the current flowing in the terminal portion 4 at the optimum values, and using the electrode of the opti-mum shape. All these attempts involve the difficulty in the maintenance of the electrode resulting from rapid electrode consumption.
1~7~3887 SUMM~RY OF THE INVENTION:
It is an object of an aspect of this invention to provide a commutator device for small electric motors where-in the cross-sectional area of terminal portions is partially made smaller at positions at which lead wires are held in position so as to increase the electrical resistance thereof when the lead wires are welded to the terminal portions by the fusing method, whereby desired heat can be obtained at a small current value, and the area being heated can be limited to a relatively small area, with the consequence that poor electrical continuity between the terminal portion and the lead wire as well as the deformation of the insulating - cylinder due to welding heat can be prevented.
It is an object of an aspect of this invention to provide a commutator device for small electrical motors - wherein the width of the terminal portion is made partly narrower at a position to which the lead wire is being pressure weldèd so as to increase the electrical resistance thereof.
It is an object of an aspect of this invention to provide a commutator device for small electric motors wherein the thickness of the terminal portion is partially made thin-ner at a position to which the lead wire is pressure welded so as to increase the electrical resistance thereof.
Various aspects of this invention are as follows:
Commutator device for small electric motors comprising an insulating cylinder having an enlarged :Jl3L'73~38~
outer diameter portion, and commutator segments having circular-arc-shaped commutator portions and terminal portions standing upright from the commutator portions, the commutator portions being mounted in spaced relation to each other on the insulating cylinder such that the terminal portions are arranged in position on the enlarged diameter portion of the insulating cylinder and are bent at a corresponding local bending portion for holding thereat lead wires of armature windings, wherein each of the terminal portions has a corresponding local narrow portion at the local bending portion the cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is made smaller at such local bending portion than that of the remaining portions of such terminal portion, and the corresponding lead wire to be held thereat is held in position by bending the corresponding terminal portion at the local narrow portion thereof and by welding the lead wire to such terminal portion thereat by resistance welding under the pushing force of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
Method of holding lead wires of armature windings to commutator segments mounted on an insulating cylinder of a commutator device for small electric motors, in which the insulating cylinder has an enlarged outer diameter portion and the commutator segments have circular-arc-shaped commutator portions and terminal portions standing .,~
, ~
-5a-38~37 upright from the commutator portions, and in which the commutator portions are mounted in spaced relation to each other on the insulating cylinder such that the terminal portions are arranged in position on the enlarged diameter portion of the insulating cylinder and are bent at a corresponding local bending portion for holding thereat such lead wires, which comprises:
providing each of the terminal portions with a corresponding local narrow portion at the local bending portion, the local cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is smaller at such local bending portion than that of the remainder of such terminal portion, placing the corresponding lead wire to be held by the corresponding terminal portion at the local narrow portion thereof, and bending the terminal portion at the bending portion thereof to hold such lead wire thereat and welding the lead wire to such terminal portion thereat by resistance welding under the pushing force of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
These objects of the invention will become more apparent by referring to the following description and appended drawings.
DETAILED DESCRIPTION OF THE EMBODIMENT:
Like reference numerals designate like or correspond-. -6-73~87 ing parts throughout the Figures. Numeral 11 designates a narrow portion of the terminal portion 4.
A commutator segment 2 used in a commutator device embodying this invention has formed thereon a local narrow portion 11 by reducing the width of a part of a terminal portion 4 having a width a, as shown in Fig. 4, a development of the terminal portion 4. That is, the width b, or local cross-sectional area, i.e. in the direction perpendicular to the longitudinal direction of the corresponding terminal portion 4, of the local narrow portion 11 is narrower, or made smaller than the width a, or cross-sectional area, of the other parts or remaining portions or longitudinal remainder of the terminal portion 4. The terminal portion 4 is bent at a position shown by dotted lines in the Figure so as to allow it to stand upright with respect to the commutator portion 3, and further bent in a U-shape at a local bending portion at the position of the narrow portion 11, for holding thereat a corresponding lead wire 7, as in the case of the conventional type commutator device shown in Fig. 2 (C). In this case, the commutator portion 3 is of course bent in a circular arc shape so as to fit to the contour of the insulating cylinder 8, such that the commutator portion 3 is mounted longitudinally or axially along the main portion of the insulating cylinder 8 of normal outer diameter while the terminal portion 4 is arranged and maintained in position on the insulating flange 9 which forms an enlarged outer diameter portion as compared to the normal diameter of the insulating cylinder 8. The commutator device of this invention is constructed by assemb-;~73887 ling in the same manner as described referring to Figs.
1 and 2. A front view of the commutator device of this invention is shown in Fig. 5, wherein the commutator portions 3 are mounted in circumferentially or peripherally spaced apart relation to each other on the insulating cylinder 8. In this commutator device, the lead wire 7 is connected to the terminal portion 4, as shown in Fig. 6, by putting the lead wire 7 into the U-bend of the narrow portion 11 of the terminal portion 4 and causing current to flow while pushing the terminal portion 4 from above by an electrode (not shown), that is, by the fusing method, and such that the lead wire 7 is welded to the terminal portion 4 at the local narrow portion 11 by resistance welding under the pushing force or pressure of the welding electrode thereat while the terminal portion 4 is maintained in its so-arranged position on the enlarged diameter portion or insulating flange 9 of the insulating cylinder 8.
Figs. 4 through 6 show an embodiment where the width of the narrow portion 11 is made narrower than that of other parts of the terminal portion 4. This invention, however, is not limited to this configuration. Similar effects can be accomplished by forming the narrow portion by partially reducing the thickness of the terminal portion 4 in the across-the width direction of the terminal portion 4, though this configuration is not shown in the Figure.
As described above, the commutator device of this invention has the narrow portion 11 on the terminal portion 4. This causes the electrical resistance value at the narrow portion .~, .~,!
.~17~8~
ll to increase when an electric current flows in the terminal portion 4 during the aforementioned fusing method. Conse-quently, even when the current used in the fusing method is set at a smaller value than that used in the conventional method described referring to Figs. 2 and 3, desired welding heat can be obtained. This results in improved fusing conditions since the insulating film on the lead wire 7 is easily destroyed, improving the electrical contact thereof with the terminal portion 4. Furthermore, by providing the narrow portion ll, the terminal portion 4 can be easily bent into a U-shape, and the physical contact between the lead wire 7 and the terminal portion 4 can be improved.
Moreover, the provision of the narrow portion ll, which facilitates the U-bending of the terminal portion 4, helps reduce the pushing force of the electrode onto the terminal portion 4, as described above, and also helps concentrate the welding heat to the narrow portion 1~, preventing local temperature rise. This can prevent the deformation of the insulating cylinder 8 or local overheating.
_~_ ,
Claims (4)
1. Commutator device for small electric motors comprising an insulating cylinder having an enlarged outer diameter portion, and commutator segments having circular-arc-shaped commutator portions and terminal portions standing upright from the commutator portions, the commutator portions being mounted in spaced relation to each other on the insulating cylinder such that the terminal portions are arranged in position on the enlarged diameter portion of the insulating cylinder and are bent at a corresponding local bending portion for holding thereat lead wires of armature windings, wherein each of the terminal portions has a corresponding local narrow portion at the local bending portion the cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is made smaller at such local bending portion than that of the remaining portions of such terminal portion, and the corresponding lead wire to be held thereat is held in position by bending the corresponding terminal portion at the local narrow portion thereof and by welding the lead wire to such terminal portion thereat by resistance welding under the pushing force of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
2. Device of claim 1, wherein the local narrow portion is formed by partially reducing the width of the terminal portion in the direction perpendicular to the longitudinal direction of the terminal portion.
3. Device of claim 1, wherein the local narrow portion is formed by partially reducing the thickness of the terminal portion.
4. Method of holding lead wires of armature windings to commutator segments mounted on an insulating cylinder of a commutator device for small electric motors, in which the insulating cylinder has an enlarged outer diameter portion and the commutator segments have circular-arc-shaped commutator portions and terminal portions standing upright from the commutator portions, and in which the commutator portions are mounted in spaced relation to each other on the insulating cylinder such that the terminal portions are arranged in position on the enlarged diameter portion of the insulating cylinder and are bent at a corres-ponding local bending portion for holding thereat such lead wires, which comprises:
providing each of the terminal portions with a corresponding local narrow portion at the local bending portion, the local cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is smaller at such local bending portion than that of the remainder of such terminal portion, placing the corresponding lead wire to be held by the corresponding terminal portion at the local narrow portion thereof, and bending the terminal portion at the bending portion thereof to hold such lead wire thereat and welding the lead wire to such terminal portion thereat by resistance welding under the pushing force. of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
providing each of the terminal portions with a corresponding local narrow portion at the local bending portion, the local cross-sectional area of which, in the direction perpendicular to the longitudinal direction of the corresponding terminal portion, is smaller at such local bending portion than that of the remainder of such terminal portion, placing the corresponding lead wire to be held by the corresponding terminal portion at the local narrow portion thereof, and bending the terminal portion at the bending portion thereof to hold such lead wire thereat and welding the lead wire to such terminal portion thereat by resistance welding under the pushing force. of a welding electrode while the corresponding terminal portion is maintained in its so-arranged position on the enlarged diameter portion of the insulating cylinder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP114086/81 | 1981-07-31 | ||
| JP1981114086U JPS5822861U (en) | 1981-07-31 | 1981-07-31 | Commutator device for small motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1173887A true CA1173887A (en) | 1984-09-04 |
Family
ID=14628727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000408560A Expired CA1173887A (en) | 1981-07-31 | 1982-07-30 | Commutator device for small electric motors |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS5822861U (en) |
| AU (1) | AU554957B2 (en) |
| BE (1) | BE893973A (en) |
| BR (1) | BR8204488A (en) |
| CA (1) | CA1173887A (en) |
| DE (1) | DE3228039A1 (en) |
| ES (1) | ES266738Y (en) |
| FR (1) | FR2510827A1 (en) |
| GB (1) | GB2105527B (en) |
| HK (1) | HK86386A (en) |
| IT (2) | IT1190937B (en) |
| MX (1) | MX153350A (en) |
| NL (1) | NL186986C (en) |
| PH (1) | PH21299A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107574U (en) * | 1982-12-29 | 1984-07-19 | マブチモ−タ−株式会社 | Commutator device for small motors |
| JPH0347028Y2 (en) * | 1985-05-31 | 1991-10-04 | ||
| JPS63120562U (en) * | 1987-01-28 | 1988-08-04 | ||
| GB2203292B (en) * | 1987-03-27 | 1992-01-08 | Johnson Electric Ind Mfg | Commutator |
| US5063279A (en) * | 1989-09-25 | 1991-11-05 | Axis Usa, Inc. | Methods and apparatus for fusing armature and stator wires |
| US5552572A (en) * | 1989-11-30 | 1996-09-03 | Axis Usa, Inc. | Methods and apparatus for identifying hooks of electric motors |
| US5241486A (en) * | 1989-11-30 | 1993-08-31 | Axis U.S.A., Inc. | Methods and apparatus for marking and identifying hooks of electric motors |
| US5122975A (en) * | 1989-11-30 | 1992-06-16 | Axis Usa, Inc. | Methods and apparatus for marking and identifying hooks of electric motors |
| DE4031015C2 (en) * | 1990-10-01 | 1994-07-28 | Licentia Gmbh | Hook collector |
| EP0542451B1 (en) * | 1991-11-12 | 1995-10-04 | Johnson Electric S.A. | An assembled commutator |
| FR2731850B1 (en) * | 1995-03-15 | 1997-04-18 | Valeo Equip Electr Moteur | ARMATURE OF A ROTATING ELECTRIC MACHINE PROVIDED WITH AN IMPROVED MANIFOLD AND STARTER COMPRISING SUCH AN ARMATURE |
| JP6147999B2 (en) * | 2012-12-03 | 2017-06-14 | 東芝ライフスタイル株式会社 | Commutator motor |
| JP2014147166A (en) * | 2013-01-28 | 2014-08-14 | Denso Corp | Manufacturing method for motor |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1525967A (en) * | 1924-08-02 | 1925-02-10 | United Electrical Mfg Company | Commutator connection |
| US3486056A (en) * | 1967-03-09 | 1969-12-23 | Eastman Kodak Co | Commutator |
| DE2034502A1 (en) * | 1970-07-11 | 1972-01-27 | Bosch Gmbh Robert | Commutator for electrical machines |
| GB1325801A (en) * | 1972-03-24 | 1973-08-08 | Franklin Freeman London Ltd | Commutators for rotating electrical machinery |
| DE7309667U (en) * | 1973-03-14 | 1976-04-08 | Robert Bosch Gmbh, 7000 Stuttgart | Drum-shaped commutator for rotating electrical machines |
| SE381137B (en) * | 1973-04-06 | 1975-11-24 | Electrolux Ab | COMMUTER FOR ELECTRICAL MACHINES AND THE WAY TO MANUFACTURE SUCH A COMMUTER |
| US4034152A (en) * | 1973-06-18 | 1977-07-05 | Warner Allan S | Termination system for fusing aluminum-type lead wires |
| US3983431A (en) * | 1974-12-23 | 1976-09-28 | General Motors Corporation | Low voltage aluminum commutators |
| US4074159A (en) * | 1976-04-16 | 1978-02-14 | Robison Russell O | Dynamo-electric machine |
| US4051323A (en) * | 1976-10-14 | 1977-09-27 | Thomas & Betts Corporation | Connector for coupling a ground conductor to the shield of a shielded conductor |
| JPS54135609U (en) * | 1978-03-15 | 1979-09-20 |
-
1981
- 1981-07-31 JP JP1981114086U patent/JPS5822861U/en active Granted
-
1982
- 1982-07-21 PH PH27603A patent/PH21299A/en unknown
- 1982-07-27 DE DE19823228039 patent/DE3228039A1/en active Granted
- 1982-07-28 GB GB08221810A patent/GB2105527B/en not_active Expired
- 1982-07-29 BE BE0/208703A patent/BE893973A/en not_active IP Right Cessation
- 1982-07-29 MX MX82193814A patent/MX153350A/en unknown
- 1982-07-30 IT IT8222688A patent/IT1190937B/en active
- 1982-07-30 ES ES1982266738U patent/ES266738Y/en not_active Expired
- 1982-07-30 FR FR8213407A patent/FR2510827A1/en active Granted
- 1982-07-30 AU AU86637/82A patent/AU554957B2/en not_active Expired
- 1982-07-30 NL NLAANVRAGE8203063,A patent/NL186986C/en not_active IP Right Cessation
- 1982-07-30 BR BR8204488A patent/BR8204488A/en not_active IP Right Cessation
- 1982-07-30 CA CA000408560A patent/CA1173887A/en not_active Expired
- 1982-07-30 IT IT8222623U patent/IT8222623V0/en unknown
-
1986
- 1986-11-13 HK HK863/86A patent/HK86386A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IT8222688A0 (en) | 1982-07-30 |
| AU554957B2 (en) | 1986-09-11 |
| PH21299A (en) | 1987-09-28 |
| ES266738Y (en) | 1983-08-16 |
| GB2105527A (en) | 1983-03-23 |
| JPS5822861U (en) | 1983-02-12 |
| NL186986B (en) | 1990-11-16 |
| BE893973A (en) | 1982-11-16 |
| NL186986C (en) | 1991-04-16 |
| IT8222623V0 (en) | 1982-07-30 |
| BR8204488A (en) | 1983-07-26 |
| NL8203063A (en) | 1983-02-16 |
| DE3228039A1 (en) | 1983-02-17 |
| JPS6213420Y2 (en) | 1987-04-07 |
| HK86386A (en) | 1986-11-21 |
| IT8222688A1 (en) | 1984-01-30 |
| MX153350A (en) | 1986-10-01 |
| ES266738U (en) | 1983-02-16 |
| FR2510827A1 (en) | 1983-02-04 |
| GB2105527B (en) | 1985-05-30 |
| IT1190937B (en) | 1988-02-24 |
| FR2510827B1 (en) | 1985-03-15 |
| AU8663782A (en) | 1983-02-03 |
| DE3228039C2 (en) | 1988-08-11 |
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