JP2006296023A - Commutator motor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a commutator motor secured by a securing means for preventing occurrence of failure or impact on the periphery, and to provide its manufacturing method. <P>SOLUTION: In the commutator motor, the metal terminal 4 of a ring varistor 1 is bonded to a commutator riser 17 while being aligned, the end-of-winding 18 of an armature coil 13 is wound around the metal terminal 4 and the commutator riser 17, and then the conductor of the end-of-winding 18 thus wound, the metal terminal 4 and the commutator riser 17 are integrated by welding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a commutator motor having a commutator having a commutator riser and a varistor for improving commutation characteristics, and a method of manufacturing the commutator motor.

  In a commutator motor, generally, an iron core is attached to a rotating shaft, a predetermined number of windings are wound around the iron core to form an amateur coil, and the commutator is attached to the rotating shaft. The commutator includes a commutator base in which a thin cylindrical body portion and a large-diameter disk portion of resin are continuously formed, and a commutator segment in which a commutator piece and a commutator riser are continuously formed. A commutator piece is provided on the side surface of the thin cylindrical body at equal intervals, and a commutator riser is provided so as to extend outward in the radial direction from the commutator piece.

The ring varistor is mounted by means of soldering one side surface of the ring varistor to the commutator piece for convenience of connection to the commutator piece provided for each amateur coil.
On the other hand, the winding terminal portion of the amateur coil is wound around a commutator riser and soldered.

  Since it is manufactured in this manner, the soldering process is performed twice in the process from the winding process to the commutator riser of the winding end portion of the armature coil to the soldering of the varistor to the commutator piece.

In addition to this, the winding end of the armature coil is fixed to the commutator riser by fusing, and the ring varistor is soldered to the commutator riser (see Patent Document 1 below),
Example of winding the winding terminal of an amateur coil around a commutator riser, placing a ring varistor in the vicinity thereof, and soldering the wound winding terminal, commutator riser and ring varistor together (the following patent) References 2 and 3),
Furthermore, an example (see Patent Document 4 below) in which the winding terminal portion of the armature coil is inserted into the notch portion of the commutator riser and the notch portion of the electrode of the ring varistor and the above three members are soldered can be seen. .

  FIG. 6 shows a conventional example of Patent Document 5 below. 6A is a cross-sectional view taken along line EE of FIG. 6B, and FIG. 6B is a bottom view of FIG. 6A.

In FIG. 6, a commutator segment 102 is provided on a base made of resin of the commutator 100, and a commutator riser 102a projects from the commutator segment 102 with a slit 102c continuously from the commutator piece 102b. Is formed. The ring varistor 101 is disposed on the commutator base, and an electrode 101a is provided with a slit 103c on a part of the ring varistor base 101b. At the time of fixing, the ring varistor 101 is disposed on the commutator 100, the slits 102c and 103c are aligned, the winding coil terminal portions are inserted into the slits 102c and 103c, and solder is poured into the slits 3 The person is fixed.
JP 2003-199298 A Japanese Patent Laid-Open No. 11-234970 JP 07-327345 A JP-A-56-88650 JP 55-23715 A

  In any of the above examples, a fusing unit or a soldering unit is used as the fixing unit. The fusing fixing means has a problem in terms of reliability because it is welded only by electric heating. Therefore, in most cases, in the case of the winding terminal portion, a method of sandwiching and crimping the winding terminal portion with the U-shaped portion is used together. If this construction method is to be adopted, a work space in which a pair of welding electrodes is inserted in the vicinity of the winding terminal portion of the commutator riser or the armature coil and the U-shaped portion of the commutator riser can be pressed with a workpiece is provided. I need it. In addition, since considerably high heat is generated in the commutator during energization heating, the insulating resin around the commutator is affected by compositional deformation and the like.

  For this reason, the fusing fixing means is not suitable for the commutator motor.

  On the other hand, in the case of the soldering means, the winding shape of the winding terminal portion wound around the commutator riser differs depending on the riser shape, the wire diameter, the number of windings, and the like. For this reason, the amount of solder for soldering them is not constant, it is difficult to control, and it is difficult to keep the connection area connected with solder small. In addition, during soldering, extra solder may adhere, voids may be easily formed and peeled off, the wetting characteristics may be uneven, and peeling may occur after soldering due to vibration. Cause failure in the motor case. Further, since flux and solder balls adhere to the soldering surface, an extra cleaning process occurs.

In general, apart from these fixing means, there is fixing means by arc welding. Fixing means by arc welding has been used for medium and large motors (see Patent Document 5).
In this example, while the winding terminal portion is pressed against the outer peripheral surface of the commutator piece with a holder, the welding head is brought close to the tip of the winding terminal portion to generate arc discharge, and both are melt-connected. Certainly, because of arc welding, there are no problems such as soldering and fusing, and the connection area can be reduced.

  However, in the case of the above arc welding, the vicinity of the welded portion of the commutator piece becomes high temperature, and at the same time, the influence of spark and contamination occur on the surface. For this reason, application of such arc welding means is difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a commutator motor fixed by a fixing means for preventing the occurrence of a failure and an influence on the surroundings, and a manufacturing method thereof.

The present invention employs the following solutions in order to achieve the above object.
(1) In a commutator motor, a metal terminal of a ring varistor is joined to a commutator riser so that the winding terminal portion of an armature coil is wound around the metal terminal and the commutator riser. The conductor of the winding terminal portion, the metal terminal, and the commutator riser are welded to form a unitary structure.
(2) In the commutator motor according to (1), the ring varistor is provided with surface electrodes at equal intervals according to the number of poles on one ring-shaped surface of a flat varistor base formed in a ring shape. The metal terminal is welded to the surface electrode.
(3) In the commutator motor according to (1) or (2), the metal terminal of the ring varistor has a long portion protruding radially outward from an outer periphery of the ring varistor, and the commutator The riser is characterized in that it has a configuration that aligns with the elongated portion.
(4) In the commutator motor described in the above (2) or (3), the metal terminal is formed in a T-shape including a base portion and the elongated portion in a flat plate shape, and the base portion is the surface of the ring varistor. It is welded to the electrode.
(5) In the commutator motor according to any one of (1) to (4), for winding a winding terminal portion of the armature coil around one or both of the metal terminal and the commutator riser. A notch or tapered wide portion is provided.
(6) In the commutator motor according to any one of the above (1) to (5), a welded body that can be welded according to claim 1 is selected from the joining portions of the metal terminal and the commutator riser. The ring varistor is provided at a position spaced radially outward from the outer periphery of the ring varistor.
(7) The commutator motor according to any one of (1) to (6), wherein the metal terminal and the commutator riser are arranged between adjacent amateur coils.
(8) In the method of manufacturing a commutator motor, a metal terminal of a ring varistor and a commutator riser are joined in a aligned state, a winding terminal portion of an amateur coil is wound around the metal terminal and the commutator riser, and the winding The wound winding terminal, the metal terminal, and the commutator riser are welded by welding means.
(9) In the method for manufacturing a commutator motor according to (8), the welding means is an arc welding means or a laser welding means.
(10) In the method of manufacturing a commutator motor according to (8) or (9), the wound winding terminal portion is removed before the welding.
(11) In the method of manufacturing a commutator motor according to any one of (8) to (10), the metal terminal is welded to a surface electrode of the ring varistor.
(12) In the method for manufacturing a commutator motor according to (10) or (11), the means for removing described in claim 8 is a combustion means.

Since the present invention employs the above solution, the following effects can be obtained.
Join the metal terminals of the ring varistor to the commutator riser and wind them together at the winding end of the armature coil, ie arc welding or laser welding the three of them, namely the commutator riser, the metal terminal and the winding end Since it is welded by welding or the like, it is possible to securely fix it integrally, and it is possible to eliminate a fixing structure that causes damage such as burnout of solder balls and insulation coating or vibrations.

  In the case where the coating of the wound winding end portion is burnt away due to the heat of welding, the insulation coating of the winding end portion is simultaneously performed with the welding of the commutator riser, the ring varistor, and the winding end portion in the welding process. Since it can be removed, the process is shortened, and no dust or the like is generated.

  In the case where the coating of the wound winding end portion is not burnt out even by the heat of welding, the burnout is burned away by other heating means or combustion means, thereby preventing generation of unnecessary dust. be able to.

  Since the welded portion of the commutator riser is separated from the commutator piece, it is possible to suppress or prevent contamination of the contact piece during arc welding, occurrence of thermal distortion of the commutator base, and the like.

  Since the arc current flows through the winding portions of the metal terminals of the commutator riser and the ring varistor, the other parts including the commutator piece are not affected by heat and current.

  Embodiments of the present invention will be described in detail with reference to the drawings.

  The commutator motor of this invention is demonstrated in order of a manufacturing process.

  FIG. 1 is a configuration diagram of a ring varistor of the present invention. FIG. 1A is a perspective view of a ring varistor provided with a metal terminal, FIG. 1B is an explanatory view of another metal terminal, and FIG. 1C is a view showing another example of attachment of the metal terminal.

The ring varistor 1 has surface electrodes 3 provided at equal intervals on one of the upper and lower ring-shaped surfaces of a flat varistor base 2 formed in a ring shape, and metal terminals 4 are welded to the surface electrodes 3 with a laser or the like. It is.
The number of surface electrodes 3 and metal terminals 4 is provided according to the number of poles of the motor. The embodiment will be described using a three-pole example. The surface electrode 3 is provided at three equal intervals on the ring-shaped surface and is separated by a gap.

  The metal terminal 4 is formed of a metal such as copper or iron, has a flat plate shape, and is configured as a T-shaped plate body including a base portion 5 having a wide width (circumferential direction of the varistor) and a long portion 6 having a small width. The The shape of the metal terminal 4 is not limited to the T-shape, and any shape may be adopted as long as it has a long portion 6 aligned with the commutator riser 17 and a portion that can be fixed to the surface electrode 3. The base 5 may have any shape that can be fixed to the surface electrode 3 of the ring varistor 1 by welding means such as laser welding. The long portion 6 protrudes radially outward from the outer periphery of the ring varistor 1. The long portion 6 may be in a shape that can be aligned with the commutator riser 17 and wind the winding terminal portion together. The metal terminal 4 has such a strength that the ring varistor 1 can be positioned and held on the commutator riser 17 when the shaft 12 is rotated or stopped.

  The shape of the metal terminal 4 can take other shapes as shown in FIG.

  The example on the right side of FIG. 1B is an example in which a wedge-shaped or groove-shaped cutout portion 8 is provided in the vicinity of the tip of the long portion 6, and is wound when the winding terminal portion 18 is wound. The structure of the notch part 8 which the winding terminal part 18 latches the winding terminal part 18 is shown so that the winding terminal part 18 may slide in the length direction of the long part 6, and may not remove | deviate from a front-end | tip. In addition, since the width is reduced by providing the notch 8, even if heat is generated at the tip of the metal terminal 4 during arc welding, it is difficult for heat to be transmitted. The terminal shape of FIG. 1B can also be applied to the commutator riser 17.

  The example on the left side of FIG. 1B is an example in which tapered wide portions (right triangle-shaped portions) 9 are provided on both ends of the long portion 6, and when the winding terminal portion 18 is wound, The structure of the taper-shaped wide part 9 which locks the coil | winding terminal part 18 is shown so that the wound coil | winding terminal part 18 may slide in the length direction of the elongate part 6, and may not remove | deviate from a front-end | tip.

  In FIG. 1 (c), the side electrodes 7 are provided at equal intervals on the outer side surface of the varistor base 2, and the base portion 5a of the metal terminal 4a is welded to the side electrode 7 by welding means such as laser welding, from the outer side surface of the base portion 5a. The long body 6a is projected at a right angle and radially outward. By doing so, the lower surface of the long portion 6a and the bottom surface of the varistor base 2 become a continuous surface. Therefore, when the metal terminal 4a is joined to the commutator riser 17 described later, the lower surface of the varistor base 2 is connected to the commutator base. 21 can be joined to the large-diameter disk portion 20 without any gap, and the play of the ring varistor 1 can be suppressed.

  FIG. 2 is a perspective view of the amateur (rotor) of the present invention.

  FIG. 2 shows an example of three poles. The amateur core 11 is formed by stacking a necessary number of punched three-pole magnetic plates. The shaft 12 is inserted into the center hole of the armature core 11, and a winding is wound around the armature core 11 to form the armature coil 13. Temporarily fix the winding terminal.

  Because the amateur coil 13 needs to remove the insulation coating from the wound winding end, the insulation coating is (1) “one that burns away with heat during welding such as arc welding or laser welding” (2) “Which remains with the heat at the time of welding, but when another heating means is used, it becomes burned and disappears.”

  As for the insulation coating that does not burn due to heat during welding such as arc welding or laser welding in (1) above, a magnet wire having a heat resistant temperature of about 120 ° C., for example, conforming to JISC3211 “polyurethane copper wire” A UEW polyurethane copper wire having a heat resistant temperature of E type 120 ° C. is used. In this UEW polyurethane copper wire, an insulating varnish mainly composed of a polyurethane resin obtained by crosslinking a polyurethane with an isocyanate is baked on a conductor.

  In addition, although the insulating coating remains burned by heat at the time of welding such as arc welding or laser welding in (2) above, the heat resistant temperature is approximately A magnet wire of about 150 ° C., for example, a PEW polyester copper wire having a heat resistance temperature of F type 155 ° C. in accordance with JISC3210 “polyester copper wire” is used. In this PEW polyester copper coin, an insulating varnish mainly composed of a polyester resin obtained by polycondensation of terephthalic acid and a polyhydric alcohol is baked on a conductor.

  For the magnet wire, it is necessary to make sure that there is no residue left over from the insulation coating, so the outline is generally selected based on the coating material and the heat-resistant temperature. Since there are many other materials for the insulating coating, etc., they can be selected and used from those other than the above examples.

As for the commutator, a commutator 15 is prepared by arranging three commutator segments 14 at the same interval on the circumference and molding them integrally with resin, and the shaft 12 is used as a central through hole of the commutator 15. The commutator piece 16 and the commutator riser 17 are positioned with respect to the armature coil 13 by insertion.
The commutator 15 includes a commutator base 21 and a commutator segment 14.

The commutator base 21 is continuously provided with a small-diameter cylindrical body portion 19 and a large-diameter disc portion 20. The commutator segment 14 continuously forms a commutator piece 16 and a commutator riser 17. The commutator pieces 16 are provided on the side surfaces of the small-diameter cylindrical body portion 19 at equal intervals, and the commutator risers 17 are provided so as to be bent at right angles to the commutator pieces 16 and extend outward in the radial direction.
The commutator riser 17 is disposed as far away from the armature coils 13 on both sides as the arm of the winding machine (not shown) can work.

  The commutator riser 17 and the metal terminal 4 preferably have a long shape extending linearly so that the winding terminal portion 18 can be wound and the following welding head can be brought close to each other with high accuracy.

  2 is inserted into the center opening of the ring varistor 1 with the surface of the metal terminal 4 of the ring varistor 1 in FIG. 1 facing down. As shown in FIG. 3, it is placed on the large-diameter disk portion 20 of the commutator base 21.

  FIG. 3 is an explanatory view showing a state in which the metal terminal 4 and the commutator riser 17 are wound around the winding terminal 18 of the present invention.

  FIG. 4 is a view for explaining a welding state by arc welding or laser welding according to the present invention.

  In the first step, the commutator riser 17 and the metal terminal 4 are aligned (aligned).

  Next, the metal terminal 4 and the commutator riser 17 are wound together at the winding terminal portion 18 of the amateur coil. The winding region is a region where welding such as arc welding or laser welding is performed. However, the welding area to be integrally welded may be a part of the winding area. The number of windings may be such that the wound state can be maintained until the end of welding. Moreover, the metal terminal 4 can be made into the notch part 8 or the taper-shaped wide part 9 of the metal terminal 4 shown in the said FIG.1 (b) as another example. Finally, the conductors of the winding terminal 18, the metal terminal 4, and the commutator riser 17 are welded together.

  The next step is the welding process. Depending on the conditions, (3) the case where a magnet wire is used in which the insulation coating of the magnet wire forming the winding terminal is burnt away by heat during welding, and (4) the winding terminal is formed. The case where the insulating coating of the magnet wire is not burned by the heat during welding and burns away by another heating means or burning means will be described separately.

  First, when the magnet wire is the above (3), in the previous step, these three members in the state where the metal terminal 4 and the commutator riser 17 are already wound together by the winding terminal 18 are simultaneously used in the winding region. Weld by arc welding or laser welding. At that time, the insulation coating of the winding terminal 18 is burned away by the heat of arc welding or laser welding. As a result of welding, the conductors of the metal terminal 4, the commutator riser 17, and the winding terminal 18 are melted to form a welded body 22. At that time, the coating of the winding terminal 18 is burned away by the heat of arc welding or laser welding.

  When the magnet wire is (4) above, the metal terminal 4 and the commutator riser 17 have already been wound together at the winding terminal 18 in the previous step. The covering of the terminal portion 18 is removed by incineration or heating with a combustion means or heating means such as a burner, and then the conductor from which the insulating covering of the winding terminal portion 18 is removed and the commutator riser wound by the conductor The three members 17 and the metal terminal 4 are arc welded or laser welded in the winding region as shown in FIG.

The above welding process will be described with an example of arc welding.
a) When the winding terminal 18 is arc-welded to the metal terminal 4 and the commutator riser 17 while being covered with the insulating coating:
In the welding process, the welding electrode of the welding apparatus (not shown) rises and contacts the lower surface of the commutator riser 17. The welding head (not shown) approaches from obliquely upward to the vicinity of the tip of the metal terminal 4. The tip of the welding head is exposed from the center of the gas nozzle. The tip of the welding head is surrounded by an inert gas ejected from the gas nozzle. Arc discharge is performed in this state, and the metal terminal 4 and the commutator riser 17 are instantaneously melted. The melted metal terminal 4 and commutator riser 17 wraps the winding terminal portion 18 in a substantially spherical shape without burning the insulation coating, and melts and bonds together to form a welded body 22.
b) When the insulation coating of the winding terminal 18 is removed by burning in the previous process:
In the welding process, the welding electrode of the welding apparatus (not shown) rises and contacts the lower surface of the commutator riser 17. The welding head (not shown) approaches from obliquely upward to the vicinity of the tip of the metal terminal 4. The tip of the welding head is exposed from the center of the gas nozzle. The tip of the welding head is surrounded by an inert gas ejected from the gas nozzle. Arc discharge is performed in this state, and the metal terminal 4 and the commutator riser 17 are instantaneously melted. The melted metal terminal 4 and commutator riser 17 are wound to wrap the winding terminal portion 18 from which the insulation coating has been removed in a substantially spherical shape, and are integrally fused to form a welded body 22.

The arc welding means used as described above can melt and bond the minute regions of the metal terminal 4 and the commutator riser 17 by adjusting the generated arc energy. The minute area can be made smaller and narrower than soldering or fusing. In addition, since the arc welding means is small in equipment and has few parts, it is suitable for work in a narrow work area and suitable for manufacturing a small and high-density motor.
Since the welded portion is in the vicinity of the metal terminal 4 and the tip of the commutator riser 17, the arc current flows in the vicinity of the metal terminal 4 and the tip of the commutator riser 17, and does not flow through the commutator piece 16, so the current is rectified by the arc current. The surface of the child piece 16 is not damaged or denatured by the arc, and the atmospheric gas is not burned and contaminated by the arc discharge.

  Further, since there is a varistor between the welded portion and the commutator piece 16, contaminants generated at the welded portion do not adhere to the surface of the commutator piece 16.

  Further, since the welded portion and the commutator piece 16 are separated from each other, heat at the time of arc welding generated at the welded portion such as the metal terminal 4 is hardly transmitted to the commutator piece 16. For this reason, the resin of the commutator base 21 does not melt, and the position of the commutator piece 16 is maintained correctly.

  As described above, the example of arc welding has been described, but laser welding can be performed in the same manner.

  Next, a commutator motor using an amateur manufactured as described above will be described.

  FIG. 5 is a cross-sectional view of a main part of the commutator motor of the present invention.

  FIG. 5A is a cross-sectional view taken along line AA in the cross-sectional view of FIG. 5B with the substantially left half centered on the rotation axis, and the substantially right half is centered on the rotation axis. It is sectional drawing cut | disconnected by the BB line in FIG.

  5B is a cross-sectional view taken along the line CC in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line DD in FIG. 5A.

  In FIG. 5A, the shaft 12 is pivotally supported on a metal bearing 23 a fixed at the left end to the recess of the frame 30, and the right end is supported at a metal bearing 23 b fixed to the recess of the bracket 31. A shaft 12 portion between both bearings is provided with a washer 34, an armature core 11 provided with an insulator (insulating paper) 24 in the throttle, a commutator base 21, and an oil drain 38 from the left end toward the right side. . The commutator base 21 is provided with a commutator segment 14, and the ring varistor 1 is placed on the commutator riser 17 of the commutator segment 14, and the metal terminal 4 and the commutator riser 17 of the ring varistor 1 are wound around them. The rotating winding terminal 18 is arc welded. A field magnet 39 is disposed on the frame 30 so as to face the amateur core 11. Further, the frame 30 is provided with a magnet pressing spring 40 for pressing the magnet 39 as shown in FIG.

  A PTC (Positive temperature coefficient of resister) 41 for preventing overcurrent is attached to the bracket 31. A socket terminal 42b is provided on one side surface of the PTC 41, and a brush holding spring 44b supporting the carbon brush 43b is connected to the other side surface. As shown in FIG. 5C, on the upper side of the shaft 12, a brush holding spring 44a supporting the carbon brush 43a and a socket terminal 42a connected thereto are provided in the same manner as the lower side.

  In this way, the configuration around the commutator (metal terminal 4, commutator riser 17, winding terminal portion 18) is configured by being fixed or integrated using arc welding means or laser welding means. The configuration of the solder ball is such that it may come off and cause a failure, or the insulation coating will not burn out, will not affect the surroundings, and will cause a failure. And can be stored in a narrow space.

It is a block diagram of the ring varistor of this invention. It is a perspective view of the amateur (rotor) of the present invention. It is explanatory drawing which shows the state which wound the metal terminal and the commutator riser in the coil | winding terminal part of this invention. It is a figure explaining the arc welding or laser welding state of this invention. It is principal part sectional drawing of the commutator motor of this invention. The example of the following following patent document 5 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Ring varistor 2 Varistor base | substrate 3 Surface electrode 4, 4a, 4b, 4c Metal terminal 5, 5a Base part 6 Long part 7 Side electrode 8 Notch part 9 Wide part 10 Amateur 11 Amateur core 12 Shaft 13 Amateur coil 14 Rectification Sub-segment 15 Commutator 16 Commutator piece 17 Commutator riser 18 Winding terminal portion 19 Small-diameter cylindrical portion 20 Large-diameter disc portion 21 Commutator base 22 Welded body 23a, 23b Metal bearing 24 Insulator 30 Frame 31 Bracket 34 Washer 38 Oil drain 39 Magnet 40 Magnet presser spring 41 PTC
42a, 42b Socket terminal 43a, 43b Carbon brush 44a 44b Brush holding spring 50 Laser welded part

Claims (12)

The metal terminal of the ring varistor is joined to the commutator riser in a state of alignment, and the winding terminal portion of the amateur coil is wound around the metal terminal and the commutator riser, and the conductor of the wound winding terminal portion is wound around The commutator motor, wherein the metal terminal and the commutator riser are welded to form a single body. In the ring varistor, surface electrodes are provided at equal intervals according to the number of poles on one ring-shaped surface of a flat plate-shaped varistor substrate, and the metal terminals are welded to the surface electrodes. The commutator motor according to claim 1. The metal terminal of the ring varistor has a long portion protruding radially outward from an outer periphery of the ring varistor, and the commutator riser has a configuration aligned with the long portion. Item 3. The commutator motor according to item 1 or 2. 4. The metal terminal according to claim 2, wherein the metal terminal has a flat plate shape and is formed in a T-shape including a base portion and the elongated portion, and the base portion is welded to the surface electrode of the ring varistor. Commutator motor. 5. A notch or a tapered wide portion for winding a winding terminal portion of the armature coil is provided on one or both of the metal terminal and the commutator riser. A commutator motor according to claim 1. The welded body that can be welded according to claim 1 is provided at a position spaced radially outward from the outer periphery of the ring varistor in a joint portion between the metal terminal and the commutator riser. Item 6. The commutator motor according to any one of Items 1 to 5. The commutator motor according to any one of claims 1 to 6, wherein the metal terminal and the commutator riser are disposed between adjacent armature coils. The metal terminal of the ring varistor and the commutator riser are joined in alignment, the winding terminal portion of the amateur coil is wound around the metal terminal and the commutator riser, the wound winding terminal portion and the metal terminal A method of manufacturing a commutator motor, comprising welding the commutator riser by welding means. 9. The method of manufacturing a commutator motor according to claim 8, wherein the welding means is an arc welding means or a laser welding means. 10. The method of manufacturing a commutator motor according to claim 8, wherein the wound end of the winding is removed before the welding. 11. 11. The method of manufacturing a commutator motor according to claim 8, wherein the metal terminal is welded to a surface electrode of the ring varistor. The method for manufacturing a commutator motor according to claim 10 or 11, wherein the removing means according to claim 8 is a combustion means.

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