JP2008029076A - Rotor for rotating electric machine and rotating electric machine for dc - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly perform wiring treatment around a commutator by realizing size and weight reduction of a rotor for a rotating electric machine and the rotating electric machine for DC. <P>SOLUTION: In the rotor 5 of a DC series wound motor 1, a plurality of conductive contactors 8b are fixed at the commutator 8, edge portions of the respective contactors 8b on a core 7 side are formed at an electrode portion 25 to be projected and provided outward in a radial direction of a rotating shaft 6. A resin guide 10 is projected and provided outward in the radial direction of the rotating shaft 6 so as to be adjacent to the electrode portion 25. The top edge portion of the guide 10 adjacent to the electrode portion 25 is projected in a different direction. A wire for forming a coil wound around pole teeth 7a of the core 7 is wound around the other pole teeth 7a after being pulled out of one of the pole teeth 7a and wound around the guide 10 adjacent to the electrode portion 25. A gap portion in which the wire is not wound is formed between the electrode portion 25 and the guide 10, and an electrode bar for fusing is brought into contact with the electrode portion in the gap portion, thus completely performing fusing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical device for direct current such as a direct current motor for an engine starter, and a rotor for rotating electrical device used in a rotating electrical device for direct current.

  As a motor having a rotor as an armature, a DC series motor is widely used. Conventionally, in a rotor of a DC series motor used for an engine starter or the like, when a coil is formed by winding a wire around a magnetic pole tooth, a winding method in which a wire is wound over a plurality of magnetic pole teeth In recent years, concentrated winding has been used to improve efficiency by increasing the line product ratio of coils and to reduce the size and weight of motors (see, for example, Patent Document 1). .

  FIG. 10 shows a schematic cross-sectional view of a conventional DC series motor shown in Patent Document 1. As shown in FIG. This direct current direct-current motor 51 has a structure including a rotor 52 and a stator 53 provided around the rotor 52. The rotor 52 is disposed adjacent to and adjacent to a rotating shaft 54, a plurality of magnetic pole teeth 55 formed radially in the radial direction of the rotating shaft 54, and one end portion of the magnetic pole teeth 55 in the axial direction. A conductive wire 57 (see FIG. 11, not shown in FIG. 10) is wound around the magnetic pole teeth 55 to form a coil. The configuration around the commutator 56 in such a direct current motor is divided into a plurality of contact pieces 56a, 56a,... Along the axial direction of the rotating shaft 54, as shown in FIG. Electrode portions 56b project radially from the end of each contact piece 56a on the magnetic pole tooth 55 side in the radial direction of the rotating shaft 54, and the wires 57 drawn from the magnetic pole teeth 55 are placed on the electrode portion 56b. It is a wound mode (see, for example, Patent Document 2). After winding the wire 57 around the electrode portion 56b, the electrode rod 100 (see FIG. 12C) is pressed against the contact portion of the electrode portion 56b, and a high voltage current is applied while applying a downward force P ( This process is hereinafter referred to as “fusing”). Due to the fusing, the electrode portion 56b is deformed and the wire 57 is sandwiched between the contact piece 56a, and the contact portion between the electrode portion 56b and the wire 57 is peeled off by the conduction of the high-voltage current, and the commutator 56 and the coil Are electrically connected. Electric power supplied from a power source (not shown) is supplied from a brush (not shown in FIG. 11) to a wire 57 via a commutator 56, and an exciting current flows through the coil to generate a magnetic field, thereby generating a stator 53 side. The rotor 52 is rotated by the attractive / repulsive force with the magnet 58.

In the magnetic pole tooth 55, the wire 57 is wound by concentrated winding to form a coil. In the DC series motor 51 having such a configuration, it is possible to further reduce the size and weight of the DC series motor 51 by shortening the rotor 52 in the axial direction of the rotating shaft 54. .
JP 2006-184937 A Japanese Patent No. 2003-88064

  However, in the inventions described in Patent Document 1 and Patent Document 2, when the rotor 52 is shortened in the axial direction of the rotating shaft 54, the wire 57 comes into contact with the electrode portions 56b other than the wound electrode portion 56b. (See arrows A1 and A2 in FIG. 11). If fusing is performed on the electrode portion 56b in this state, the covering of the wire 57 that is in contact with the electrode portion 56b (not wound) is peeled off, and the rectification by the commutator 56 is not performed correctly, so that the rotor 52 There is a problem that can interfere with the rotation of. Further, as shown in FIGS. 12A and 12B, the upper surface of the electrode portion 56b crosses the upper surface of the electrode portion 56b around which the wire 57 drawn in an oblique direction from the rotor 52 is wound. It is easy to happen. When fusing the electrode portion 56b in this state, as shown in FIG. 12C, the electrode portion 100 is pressed against the portion R where the upper surface of the electrode portion is covered by the wire 57. 56 is pressed. In this case, since no current is conducted to the electrode portion 56 and fusing is impossible, there is a problem that the wire 57 cannot be peeled off and the exciting current cannot be supplied to the coil of the rotor 52.

  The present invention has been made in view of such a problem. While realizing miniaturization and weight reduction by shortening the rotating shaft in the axial direction, wiring processing around the commutator is appropriately performed and fusing is performed. It is an object to provide a rotor for rotating electrical equipment and a rotating electrical apparatus for direct current that can be reliably performed.

  In order to solve such a problem, the invention according to claim 1 is characterized in that a rotating shaft and a plurality of magnetic pole teeth around which a conductive wire is wound are arranged radially on the rotating shaft, and A core in which a coil is formed by winding a wire; a commutator provided on the axis of the rotating shaft in the vicinity of the core; and a diameter of the rotating shaft positioned between the core and the commutator In a rotor for a DC motor, comprising a plurality of electrodes protruding in a direction and wound around the wire drawn out from the core to electrically connect the wire and the commutator, the core and the electrode An insulative guide for winding the wire together with the electrode part is provided between the part and the electrode part so as to protrude in the radial direction of the rotating shaft.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the guide has a proximal end portion close to the proximal end portion of the electrode portion and a distal end portion separated from the distal end portion of the electrode portion. It is characterized by that.

  According to a third aspect of the invention, in addition to the configuration of the first or second aspect, the DC motor is a starter motor for an internal combustion engine.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, in the coil, the wire is wound around the magnetic pole teeth by a concentrated winding method. To do.

  According to the first aspect of the present invention, there is provided an insulating guide for winding a wire together with the electrode portion between the core and the electrode portion, adjacent to the electrode portion, in the radial direction of the rotation shaft. By projecting, in the electrode part other than the electrode part around which the wire is wound, the wire adjacent to the electrode part comes into contact with the guide, and the electrode part other than the electrode part around which the wire is wound is The situation of contact is reliably prevented. A gap portion around which no wire is wound is formed between the electrode portion and the guide, and the fusing electrode rod can be brought into contact with the electrode portion in this gap portion. As a result, the wiring process around the commutator can be appropriately performed and the fusing can be reliably performed while realizing the reduction in size and weight by shortening the rotating shaft in the axial direction.

  According to the second aspect of the present invention, the guide is adjacent to the electrode portion and the electrode portion by having the proximal end portion close to the proximal end portion of the electrode portion and the distal end portion being separated from the distal end portion of the electrode portion. The guide is in a state of protruding from the proximal end portions close to each other in the direction in which the distal end portions are separated from each other. A large gap is formed between the electrode portion and the guide, and the fusing electrode rod can be brought into contact with the electrode portion in this gap. This makes it possible to perform fusing more reliably.

  According to the third aspect of the present invention, since the DC motor is a motor for a starter of an internal combustion engine, in the DC series-wound motor for a starter that is highly required to be reduced in size and weight, in the axial direction of the rotating shaft. It is possible to appropriately perform the wiring process around the commutator and reliably perform the fusing while realizing a reduction in size and weight by shortening the length of the commutator.

  According to the fourth aspect of the present invention, in the coil, the wire is wound around the magnetic pole teeth by the concentrated winding method, so that the wire drawn from the core contacts the electrode portion other than the electrode portion around which the wire is wound. In a winding-type rotor that is prone to occur, the wiring around the commutator is appropriately processed and the fusing is performed reliably while realizing a reduction in size and weight by shortening the rotation axis in the axial direction. Make it possible.

  Embodiments of the present invention will be described below.

  1 to 9 show an embodiment of the present invention.

  Reference numeral 1 in FIG. 1 denotes a direct current motor 1 as a direct current rotating electrical apparatus of the present invention. The direct current motor 1 is used for a starter of an engine such as a snowmobile, and is built in the snowmobile or the like together with an in-vehicle battery (not shown).

  As shown in FIG. 1, the direct current motor 1 is mounted in a stator 4 including a cylindrical yoke 2 and four arc-shaped cross-section magnets 3 joined to the inner surface of the yoke. And a rotor (rotor for rotating electrical equipment) 5. As the magnet 3, a ferrite magnetic material forming a normal magnet or a magnet made of a high energy neodymium magnet is used.

  On both sides of the yoke 2, a front cover 11 that covers the front in the axial direction (left side in FIG. 1) of the rotary shaft 6 and a rear cover 12 that covers the rear in the axial direction (right side in FIG. 1) of the rotary shaft 6 are mounted. A motor case 13 is formed together with the yoke 2. Bolt insertion holes 26a and 26b are formed in the front cover 11 and bolt insertion holes 27a and 27b are formed in the rear cover 12, respectively. Bolts 28a and 27a are bolts 28a, and bolt insertion holes 26b and 27b are bolts. 28b is inserted and the front cover 11 and the rear cover 12 are fastened.

  As shown in FIG. 2, the rotor 5 includes a core 7 mounted on the rotating shaft 6 so as to face the magnet 3, and a commutator 8 mounted on the end of the rotating shaft 6 adjacent to the core 7. Consists of.

  As shown in FIG. 3, the core 7 has a plurality of (in the present embodiment, six) magnetic pole teeth 7 a radially projecting from a plurality of substantially T-shaped (or slightly projecting sides). A large number of thin steel plate materials having the above shapes are laminated, and a conductive wire 9 (see FIG. 8, not shown in FIG. 3) is wound around each magnetic pole tooth 7a to form a coil. . The wire 9 wound around the magnetic pole teeth 7a is usually a thin wire having a diameter of 0.9 mm or less. When a neodymium magnet is used as the magnet 3, a thick wire having a diameter of approximately 1 mm or more is used to flow a current corresponding to the energy. A wire may be used.

  Between adjacent magnetic pole teeth 7a, 7a, a slot 16 is formed as a space for winding the wire.

  The rotating shaft 6 of the rotor 5 is rotatably held by the front cover 11 and the rear cover 12 via bearings 14 respectively. As shown in FIG. 1, the rear cover 12 is provided with a positive terminal 15 for supplying positive power from an in-vehicle battery (not shown). As shown in FIG. 4, the positive terminal 15 is connected to the positive brushes 22 a and 22 b that are in sliding contact with the commutator 8, and the negative brushes 23 a and 23 b that are in sliding contact with the negative electrode (ground side) commutator 8 are Are connected to ground (not shown) via cables or negative terminals 24a, 24b.

  As shown in FIG. 1, an oil seal 17 for preventing oil from entering the motor case 13 from the engine side and an O-ring 18 for sealing the engine mounting portion are mounted on the front cover 11.

  As shown in FIG. 4, a disc-shaped brush holder 21 is fixed in the rear cover 12 that covers the commutator 8 at the end of the rotating shaft 6. Two positive brushes 22a and 22b and two negative (grounding) brushes 23a and 23b are fixed at four positions of 90 radial angles on the brush holder 21 so as to face each other. The positive brushes 22a and 22b and the negative brushes 23a and 23b are urged toward the inner commutator 8 by an elastic member (not shown). The positive brushes 22a and 22b are connected to the positive terminal 15, and the negative brushes 23a and 23b are connected to negative (ground) terminals 24a and 24b.

  As shown in FIGS. 5 and 6, the commutator 8 has a substantially cylindrical overall shape, and the outer peripheral surface of the substantially cylindrical commutator main body 8a has a number corresponding to the magnetic pole teeth 7a (this embodiment). 12 plate-like contact pieces 8b are fixed along the axial direction of the commutator body 8a.

  The commutator body 8a is made of an insulating thermosetting resin material. In the present embodiment, the resin is formed of a phenol resin that is less susceptible to deterioration in strength, mechanical strength, electrical insulation, and the like at high temperatures, and that can suppress deterioration of physical properties for a long period of time even at high temperatures. The inner diameter of the commutator body 8 a is formed to be substantially the same as the outer diameter of the rotating shaft 6.

  The contact piece 8b is made of a material (for example, copper or brass) that is conductive and easy to process, and that is not easily worn by sliding contact with other members. As shown in FIG. 6, a fixing piece 8c having a substantially L-shaped cross section protrudes from the back side of the contact piece 8b (the side facing the commutator main body 8a), and this fixing piece 8c is the commutator main body. The contact piece 8b is fixed to the commutator body 8a by being embedded in the inside of 8a. There is a gap between the contact pieces 8b, and the contact pieces 8b are electrically insulated from each other. Positive electrode brushes 22 a and 22 b and negative electrode brushes 23 a and 23 b (see FIG. 4) are in sliding contact with the outer peripheral side of the commutator 8.

  From one end of the contact piece 8b, a conductive plate material forming the contact piece 8b is extended to form the electrode part 25. As shown in FIGS. 5 and 6, the electrode portions 25 are formed in the same number as the contact pieces 8 b (12 in this embodiment), and are bent from the base end portion outward in the radial direction of the commutator main body portion 8 a. . This bending angle is an acute angle when viewed from the side of the commutator body 8a (see angle α ° in FIG. 6). As a result, the assembly of the electrode portions 25 has a shape that expands radially when viewed from the axial direction of the commutator body portion 8a (see FIG. 5), and each electrode portion 25 is a contact piece 8b when viewed from the side. It is inclined and extended to the other end side (right side in FIG. 6).

  A resin guide 10 projects from one end of the commutator body 8a. As shown in FIGS. 5 and 6, each guide 10 is adjacent to the contact piece 8b, and the same number (12 in this embodiment) as the contact pieces 8b protrudes radially outward of the commutator body 8a. It is installed. The protruding direction is a substantially vertical direction when viewed from the axial direction of the commutator body 8 (see angle β ° in FIG. 6). As a result, the assembly of the guides 10 has a shape that expands radially when viewed from the axial direction of the commutator body 8a (see FIG. 5). As will be described later, the wire 9 is wound around the guide 10 together with the adjacent electrode portion 25.

  When the commutator 8 is formed, the commutator 8 is mounted in the vicinity of the core 7 with the commutator body 8 a inserted through the rotating shaft 6. That is, in the rotor 5, the axial direction of the commutator body 8 matches the axial direction of the rotary shaft 6.

  In the direct current direct-winding motor 1 of the present embodiment, the coil formed on each magnetic pole tooth 7a is formed by winding a wire around the magnetic pole tooth 7a in a concentrated winding manner. FIG. 7 is a schematic diagram showing an example of a winding method of the wire 9 forming a coil in the rotor 5 of the direct current motor 1 of the present embodiment. Hereinafter, the winding method of the wire 9 will be described with reference to FIG.

In FIG. 7, the magnetic pole teeth 7 a _{01 to} 7 a ₀₆ and the electrode portions 25 _{01 to} 25 are used to distinguish the six magnetic pole teeth 7, the twelve electrode portions 25, and the twelve guides 10 of the rotor 5. ₁₂ , guides 10 ₀₁ to 10 ₁₂ . Hereinafter, when it is necessary to distinguish in the text, they are described as magnetic pole teeth 7a _{01 to} 7a ₀₆ , electrode portions 25 _{01 to} 25 ₁₂ , and guides 10 ₀₁ to 10 ₁₂ .

In forming the coil, first, extend the one electrode portion 25 ₀₁ from the one magnetic pole teeth 7a ₀₁ to the wire 9 serving as a winding start winding to rotate the wire 9 on the magnetic pole teeth 7a _01. Next, the electrode portion _{25 02} next to the winding start of the electrode portions _{25 01} of the magnetic pole teeth _{7a 01} pull the wires 9, and after wound adjacent guide _{10 02} wound, next to the one magnetic pole teeth _{7a 01} in the magnetic pole teeth _{7a 06} extend wire 9, spirally wound wires 9 on the magnetic pole teeth _{7a 06.} Next, after the wire 9 is pulled out from the magnetic pole tooth 7a ₀₆ and wound around the electrode portion 25 ₀₉ and the adjacent guide 10 ₀₉ , the wire 9 is extended to the magnetic pole tooth 7a ₀₅ adjacent to the one magnetic pole tooth 7a _06. The wire 9 is wound around the magnetic pole teeth 7a ₀₅ . The above procedure, i.e., after turning one and adjacent guide _{1001 to 1012} wound pole teeth _{7a n (1 ≦ n ≦ 12} ) from pulling out the wire 9 electrode portion _{25 01-25 12,} the wire magnetic pole teeth _{7a n-1} is the 9 next to the magnetic pole teeth 7a _n (or magnetic pole teeth _{7a n + 1)} wound in further magnetic pole teeth _{7a n-1} (or the magnetic pole teeth _{7a n + 1)} separate electrode wire 9 drawn out from After winding around one of the parts 25 _{01 to} 25 ₁₂ and the adjacent guides 10 ₀₁ to 10 ₁₂ , winding them around the magnetic pole teeth 7a _n-2 (or the magnetic pole teeth 7a _{n + 2} ), and repeating the procedure Will form. Then, the end of winding of the wire 9 is connected to the beginning of winding in one electrode portion ₂₅₀₁ to form a state where there is no coil end. In the schematic diagram of FIG. 7, the wire 9 extending from the electrode portion 25 to the magnetic pole tooth 7a is wound around the magnetic pole tooth 7a only once and drawn out to the other electrode portion 25. 7a may be wound a plurality of times and drawn to the other electrode portion 25.

FIG. 8 shows an enlarged view of an aspect around the electrode portion 25, the guide 10, and the magnetic pole teeth 7 a as a result of winding the wire 9 around the magnetic pole teeth 7 a, the electrode portion 25, and the guide 10. As shown in the figure, the wire 9 drawn out from one magnetic pole tooth 7a is wound around one electrode portion 25 and a guide 10 adjacent to the electrode portion 25 and then adjacent to one magnetic pole tooth 7a. Are wound around the magnetic pole teeth 7a. Here, between the core 7 and the electrode portion 25, an insulating guide for winding the wire 9 together with the electrode portion is provided so as to protrude in the radial direction of the rotating shaft 6, adjacent to the electrode portion 25. Thus, even if the wire 9 comes close to the electrode part 25 other than the electrode part 25 around which the wire 9 is wound, the wire 9 comes into contact with the guide 10 (arrows A ′ ₁ and A in FIG. 8). 'See ₂ places), and the situation where the wire 9 is wound around the electrode part 25 other than the electrode part 25 wound is reliably prevented. And since the guide 10 is insulative, even if fusing is performed on the electrode portion 25, the guide 10 contacts the electrode portion 25 other than the electrode portion 25 around which the wire 9 is wound, and the wire 9 The coating is not peeled off, and therefore it is possible to prevent the electrode portion 25 other than the wound electrode portion 25 and the wire 9 from being electrically connected.

  The projecting direction of the guide 10 is substantially vertical when viewed from the axial direction of the commutator body 8 (see angle β ° in FIG. 6), and the bending angle of the electrode 25 with respect to the contact piece 8b is the commutator body. It is an acute angle when viewed from the side of 8a (see angle α ° in FIG. 6). That is, the guide 10 has a shape in which the proximal end portion is close to the proximal end portion of the electrode portion 25 and the distal end portion is separated from the distal end portion of the electrode portion 25. That is, the electrode portion 25 and the guide 10 adjacent to the electrode portion 25 are in a state of protruding from the proximal end portions close to each other in the direction in which the distal end portions are separated from each other. Therefore, as shown in FIGS. 9A and 9B, a gap portion S where the wire 9 is not wound is formed between the electrode portion 25 and the guide 10 adjacent to the electrode portion 25.

Since the electrode rod 100 can be reliably brought into contact with the upper surface of the electrode portion 25 in the gap portion S, the electrode rod 100 is pressed with the electrode portion 25 in contact with the electrode portion 25 as shown in FIG. In addition, it is possible to reliably perform fusing on the electrode portion 25. Thus, in the portion in contact with the electrode portion 25 Strip the wire 9, the wire 9 and an electrode 25 01 _to the electrode portions 25 ₁₂ as ready conduction current is reliably exciting current to the coil of the rotor 5 Can supply.

  As described above, in the present embodiment, the rotor 5 and the direct-current motor 1 provided with the rotor 5 are reduced in size and weight, and wiring processing around the commutator 5 is appropriately performed and Zing can be performed reliably.

  In particular, in the direct-current-winding motor 1 of the present embodiment, the wire 9 is a concentrated winding method, and after the wire 9 drawn out from one magnetic pole tooth 7a is wound around the electrode portion 25, one magnetic pole tooth is obtained. The wire 9 drawn out from the core 7 is in contact with the electrode portions 25 other than the electrode portion 25 to be wound by being wound around the other magnetic pole teeth 7a adjacent to or close to the 7a. In the winding method and winding mode in which a situation is likely to occur, the rotor 5 is shortened in the axial direction of the rotating shaft 6, and the rotor 5 and the direct-current motor 1 itself are reduced in size and weight. In addition, it is possible to reliably perform fusing.

  Further, the direct-current-winding motor 1 of the present embodiment is used for a starter of a snowmobile engine, so that the rotor 5 is shortened in the axial direction of the rotary shaft 6 in a motor that is highly required to be small and light. This makes it possible to reduce the size and weight of the rotor 5 and the direct current direct-winding motor 1 itself and to perform the fusing reliably.

  In the above embodiment, the DC series motor 1 is a motor for a starter of a snowmobile, but is not limited to this, and is a direct current motor other than that for a starter of an internal combustion engine other than a snowmobile or a starter of an internal combustion engine. It can also be applied to a winding motor.

  Moreover, in the said embodiment, although the rotary electric equipment for DC which concerns on this invention was used as the direct-current-winding motor 1, it is not limited to this, The DC motor of the other winding system which provided the commutator in the rotor It can also be applied to.

  It goes without saying that the above embodiment is an exemplification, and does not mean that the present invention is limited to the above embodiment.

It is sectional drawing which shows the direct current | flow series motor which concerns on embodiment of this invention. It is a side view of the rotor in a direct current direct-current motor same as the above. FIG. 2 is a cross-sectional view taken along line AA with the rear cover removed in FIG. 1. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a front view of the commutator in a rotor same as the above. It is CC sectional view taken on the line of FIG. It is a schematic diagram which shows the winding method of the wire in a rotor same as the above. It is an enlarged view of the electrode part periphery in the state which wound the wire around the rotor same as the above. (A) An enlarged cross-sectional view of the periphery of the electrode portion in a state where the wire is wound in the direct current direct-current motor, (B) A front view of the periphery of the electrode portion, (C) Fusing the electrode portion with an electrode rod It is an expanded sectional view around the electrode part at the time. It is sectional drawing which shows the conventional direct current direct-winding motor. It is an enlarged view of an electrode part periphery in the state which wound the wire around the rotor in the direct current direct-winding motor. (A) An enlarged cross-sectional view of the periphery of the electrode portion in a state where a wire is wound in the direct current direct-winding motor, (B) A front view of the periphery of the electrode portion, (C) An electrode when the electrode portion is pressed with an electrode rod It is an expanded sectional view of a part periphery.

Explanation of symbols

1, 51 ... DC series motor (DC rotating electrical equipment)
4, 53 ... Stator 5, 52 ... Rotor (rotor for rotating electrical equipment)
6,54 ... rotating shaft 7 ... core _{7a, 7a 01 ~7a 06, 55} ··· magnetic pole teeth 8,56 ... commutator 9,57 ... wire 10, 10 _{01-10 12} - ..Guide 25, 25 _{01 to} 25 ₁₂ ... Electrode part

Claims (4)

A rotating shaft and a plurality of magnetic pole teeth around which a conductive wire is wound are arranged radially on the rotating shaft, and a coil is formed by winding the wire around the magnetic pole teeth, and close to the core And a commutator provided on the shaft of the rotating shaft, and a plurality of the wires that are positioned between the core and the commutator and project in the radial direction of the rotating shaft and drawn from the core are wound. In a DC motor rotor comprising an electrode portion for electrically connecting the wire and the commutator,
Between the core and the electrode part, an insulating guide for winding the wire together with the electrode part is provided adjacent to the electrode part so as to project in the radial direction of the rotating shaft. DC motor rotor characterized by   The guide has a proximal end portion close to the proximal end portion of the electrode portion and a distal end portion separated from the distal end portion of the electrode portion.   The DC motor rotor according to claim 1, wherein the DC motor is a starter motor for an internal combustion engine.   4. The DC motor rotor according to claim 1, wherein in the coil, the wire is wound around the magnetic pole teeth by a concentrated winding method. 5.

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