JP2011200093A - Motor with dc brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with a DC brush that provides a good workability in short-circuiting segments of the same potential of a commutator and connecting a varistor to the commutator.SOLUTION: The motor with a DC brush includes an armature core 11 having a plurality of salient poles 12, a coil wound around the salient poles 12, the commutator 20 connected to the coil, a brush that is brought into sliding contact with the commutator 20 to supply a current, the varistor 15 having electrodes to be connected to the commutator 20, and a permanent magnet disposed facing the salient poles 12. The motor with a DC brush is equipped with a printed board 16 whereon a printed pattern for short-circuiting the segments of the same potential of the commutator 20 and a printed pattern for connecting the electrodes of the varistor 15 to the commutator 20 are printed.

Description

  The present invention relates to a motor with a DC brush.

  Conventionally, in a DC brush motor, a coil wound around an armature core is connected to a commutator, and current is supplied to the commutator via a brush to rotate the motor.

  Patent Document 1 discloses a motor with a three-phase brush, and discloses a configuration in which segments of commutators having the same potential are short-circuited by a connecting line.

  In Patent Document 2, the commutator segments are connected to each other on the printed circuit board at one axial end of the armature core, and the varistor (spark erasing element) is connected to the other axial end of the armature core. Is disclosed.

JP 2009-183114 A JP 58-108950 A

  In the invention described in Patent Document 1 described above, the segments having the same potential of the commutator are short-circuited by the connection lines, and thus there is a problem that workability is poor. Further, since a spark discharge is generated by a high counter electromotive voltage generated by the intermittent connection between the brush and the commutator piece, it is desirable to absorb the spark discharge by the varistor. Is not disclosed at all.

  Further, in the invention described in Patent Document 2, it is difficult to mount the printed circuit board and the varistor simultaneously, such as short-circuiting the segments of the same potential of the commutator by the printed circuit board and connecting the varistor (spark erasing element) to the commutator. Therefore, it is disclosed that the printed circuit board and the varistor are arranged on opposite sides of the armature core. However, when the printed circuit board and the varistor are arranged at different positions as described above, workability is naturally deteriorated.

  The present invention has been made in order to solve such a conventional problem, and can perform short-circuit between segments of the same potential of the commutator and connection of the varistor to the commutator with good workability. An object is to provide a motor with a DC brush.

  In order to achieve the above object, the present invention provides an armature core having a plurality of salient poles, a coil wound around the salient poles, a commutator connected to the coils, and a current in sliding contact with the commutator. In a DC brush motor having a varistor having an electrode connected to the commutator and a permanent magnet disposed opposite to the salient pole, the same potential segments of the commutator are short-circuited. A printed circuit board on which a printed pattern for connecting a printed pattern and an electrode of the varistor to the commutator is printed is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the motor with a DC brush which can perform the short circuit of the segments of the same electric potential of a commutator and the connection to the commutator of a varistor with sufficient workability | operativity can be provided.

It is a disassembled perspective view which shows the structure of the armature of the motor with DC brush which concerns on one embodiment of this invention. It is a sectional side view of the armature 10 shown in FIG. It is a top view of the armature core 11 shown in FIG. It is a figure which shows the insulator 13 shown in FIG. 1, (a) is a perspective view, (b) is a top view. FIG. 2 is a plan view of the printed circuit board 16 shown in FIG. 1, (a) is a diagram showing a lower surface in FIG. 1, and (b) is a diagram showing an upper surface in FIG. 1. It is a figure which shows the ring varistor 15 shown in FIG. 1, (a) is a top view which shows the lower surface in FIG. 1, (b) is VIB-VIB sectional drawing of (a). It is a disassembled perspective view which shows the structure of the armature of the motor with DC brush which concerns on the 2nd Embodiment of this invention. FIG. 8 is a plan view of the printed board 116 shown in FIG. 7, (a) is a view showing the lower surface in FIG. 7, and (b) is a view showing the upper surface in FIG. 7. It is a disassembled perspective view which shows the structure of the armature of the motor with DC brush which concerns on the 3rd Embodiment of this invention. FIG. 10 is a plan view of the printed circuit board 216 shown in FIG. 9, (a) is a view showing the lower surface in FIG. 9, and (b) is a view showing the upper surface in FIG. 9.

  Hereinafter, a DC brush motor according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a structure of an armature of a DC brush motor according to an embodiment of the present invention.

  FIG. 2 is a side sectional view of the armature shown in FIG.

  As shown in FIGS. 1 and 2, the armature 10 of this embodiment covers an armature core 11 from above and below an insulator 13, and further has a cylindrical insulating resin 21 and a rectifier provided on the outer periphery thereof. It has the commutator 20 which consists of the piece 22, and has the ring varistor 15 and the printed circuit board 16, and these are penetrated by the shaft 14 which is a rotating shaft. In the case where the armature 10 is a rotor, a permanent magnet disposed facing the rotor, a brush for supplying an electric current from the outside, and a bearing for fixing the rotor are generally used. Since the configuration is the same as that of a brushed DC motor, description and drawings are omitted. Also, the coil wound around the salient pole of the armature core 11 is not shown in FIGS.

  FIG. 3 is a plan view of the armature core 11 shown in FIG.

  FIG. 4 is a view showing the insulator 13 shown in FIG. 1, (a) is a perspective view, and (b) is a plan view.

  The armature core 11 is formed by punching a silicon steel plate into a planar shape shown in FIG. In this embodiment, the armature core 11 has twelve salient poles 12. Each of the 12 salient poles 12 has arm portions 12a extending radially outward from the center. The shaft 14 is passed through the central hole of the armature core 11 and fixed at a predetermined position.

  As shown in FIGS. 1 and 2, one insulator 13 is provided on each of the upper side and the lower side of the armature core 11. FIG. 4 shows one insulator 13, but the other insulator 13 has the same shape.

  The insulator 13 is made of an insulator, for example, resin, and has an arm portion 13b that covers the arm portion 12a of the salient pole 12 from both sides and the upper surface. The arm portion 13b of the other insulator 13 covers the arm portion 12a of the salient pole 12 from both sides and the lower surface. By doing so, the arm portion 12 a of the salient pole 12 is completely covered by the arm portion 13 b of the upper and lower insulators 13.

  A pedestal portion 13a is provided at the center of the insulator 13, and a through hole 13c is provided at the center of the pedestal portion 13a.

  In the present embodiment, the number of salient poles 12 is twelve, but the present invention is not limited to this.

  The commutator 20 includes twelve commutator pieces 22 corresponding to the salient poles 12 of the armature core 11, and each commutator piece 22 has a terminal 23 projecting radially outward and an axial direction. It has a riser 24 projecting downward and a fixing piece 25 projecting radially inward, and a commutator piece 22 with respect to an insulating resin 21 that is substantially cylindrical and resin-molded with a hole in the center. The fixing piece 25 is fixed. The shaft 14 is passed through the center of the commutator 20, and the lower surface of the insulating resin 21 is abutted against and fixed to the upper surface of the pedestal portion 13a of the insulator 13 (see FIG. 2).

  A coil (not shown) of the armature 10 is wound around the respective salient poles 12 of the armature core 11 by first winding the end of a magnet wire (not shown) around a predetermined riser 24 of the commutator 20. The coil is wound from above the arm portion 13b of the insulator 13 and wound around a predetermined riser 24 to form a coil.

  5 is a plan view of the printed circuit board 16 shown in FIG. 1, (a) is a view showing the lower surface in FIG. 1, and (b) is a view showing the upper surface in FIG. 1.

  The printed circuit board 16 formed in an annular shape has a wiring pattern (print pattern) formed on both sides, and a predetermined one of twelve commutator pieces 22 is provided on one side (the side shown in FIG. 5B). The wiring patterns 201, 202 and 203 are formed in the circumferential direction to be short-circuited so that the commutator pieces have the same potential (predetermined segments of the commutator have the same potential), and the other surface (FIG. 5A). 12), 12 wiring patterns 191 extending radially so as to connect the electrode 15b (see FIG. 6) of the ring varistor 15 and the commutator piece 22 are formed.

  5A, twelve land portions 161 are provided on the outer side in the circumferential direction of the printed board 16, and twelve land portions 181 are provided on the inner side in the circumferential direction. The land portions 161 and the land portions 181 are respectively provided. Are electrically connected by a wiring pattern 191.

  Further, the printed circuit board 16 penetrates through the circuit board, and 12 through holes that electrically connect a predetermined wiring pattern among the wiring patterns 201, 202, and 203 on one surface and the wiring pattern 191 on the other surface. A hole 171 is provided. As shown in FIG. 5B, the through hole A, the through hole D, the through hole G, and the through hole J are connected by the wiring pattern 203, and the through hole B, the through hole E, the through hole H, and the through hole K are connected to each other. Are connected by the wiring pattern 202, and the through hole C, the through hole F, the through hole I, and the through hole L are connected by the wiring pattern 201.

  6A and 6B are views showing the ring varistor 15 shown in FIG. 1, wherein FIG. 6A is a plan view showing a lower surface in FIG. 1, and FIG. 6B is a sectional view taken along the line VIB-VIB in FIG.

  The ring varistor 15 has a varistor element 15a made of ceramic or the like formed in a ring shape, and has an electrode 15b only on one side thereof. Twelve electrodes 15b, which are the same number as the commutator pieces 22, are provided substantially evenly in the circumferential direction of the varistor element 15a.

  In the present embodiment, as shown in FIG. 1, the surface of the ring varistor 15 provided with the electrode 15b is the lower surface, and the other surface of the printed board 16 (the surface shown in FIG. 5A) is the lower surface. Each of the 12 electrodes 15b and each of the 12 outer lands 161 are aligned in the circumferential direction, and each is electrically connected by soldering over the thickness of the varistor element 15a. A ring varistor 15 is mounted on 16.

  Further, after winding the coil around the electric core 11, the printed board 16 on which the ring varistor 15 is mounted is passed through the shaft 14, and each of the twelve inner lands 181 of the printed board 16 and the radially outer side of the commutator 20 are passed. Each of the twelve terminals 23 projecting to each other is aligned in the circumferential direction, and each of them is electrically connected and fixed by soldering.

  Hereinafter, another embodiment of the present invention will be described.

  FIG. 7 is an exploded perspective view showing the structure of the armature of the DC brush motor according to the second embodiment of the present invention.

  In addition, in the armature 100 of this embodiment, since the structure around the armature core 111 is the same as that of the armature core 11 shown in FIG. 1, the detailed description will be given below using the same reference numerals as those in FIG. Omitted. Further, the structure of the ring varistor 115 is also the same as that of the ring varistor 15 shown in FIG. 6, and therefore, the same reference numerals as those in FIG.

  As shown in FIG. 7, the armature 100 of this embodiment covers the insulator 13 from above and below the armature core 111, and further has a cylindrical insulating resin 121 and a commutator piece 122 provided on the outer periphery thereof. And a ring varistor 115 and a printed circuit board 116, which are configured to penetrate through a shaft 14 which is a rotating shaft. In the case where the armature 100 is a rotor, a permanent magnet disposed facing the rotor, a brush for supplying an electric current from the outside, and a bearing for fixing the rotor are generally used. Since the configuration is the same as that of a brushed DC motor, description and drawings are omitted. Also, the coil wound around the salient pole of the armature core 111 is not shown in FIG.

  The commutator 120 includes twelve commutator pieces 122 corresponding to the salient poles 12 of the armature core 111, and each commutator piece 122 has a terminal 123 projecting radially outward and a radial direction. It has a fixed piece projecting inward (not shown because it is the same as the fixed piece 25 in FIG. 2), and it has a substantially cylindrical shape with a hole in the center and is resin-molded against the insulating resin 121 The fixed piece of the commutator piece 122 is fixed.

  8 is a plan view of the printed board 116 shown in FIG. 7, (a) is a view showing the lower surface in FIG. 7, and (b) is a view showing the upper surface in FIG. 7.

  The printed circuit board 116 formed in an annular shape has a wiring pattern (print pattern) formed on both sides, and a predetermined one of twelve commutator pieces 122 is provided on one side (the side shown in FIG. 8B). Form a circumferential wiring pattern that short-circuits so that the commutator pieces have the same potential (predetermined segments of the commutator have the same potential) on the other surface (the surface shown in FIG. 8A). Form 12 wiring patterns 1191 extending radially so as to connect the electrode 15 b of the ring varistor 115 and the commutator piece 122.

  The printed circuit board 116 has twelve arm portions 116a projecting radially outward in the radial direction, and each of the wiring patterns 1191 is formed on the arm portion 116a.

  Further, twelve land portions 1181 are provided in the circumferential direction inside the printed board 116 in the radial direction, and each wiring pattern 1191 is connected to each land portion 1181.

  The connection structure between the wiring patterns 1201, 1202, and 1203 and the wiring pattern 1191 by the through holes 1171 of the printed board 116 is the same as the through holes 171 of the printed board 16 shown in FIG. Omitted.

  In the present embodiment, as shown in FIG. 7, the surface on which the electrode 15b of the ring varistor 115 is provided is the lower surface, and the other surface of the printed board 116 (the surface shown in FIG. 8A) is the lower surface. Each of the 12 electrodes 15b and each of the wiring patterns 1191 on the 12 arm portions 116a are aligned in the circumferential direction, and each is electrically connected by soldering over the thickness of the varistor element 15a. Then, the ring varistor 115 is mounted on the printed board 116.

  Also, each land portion 1181 of the printed board 116 on which the ring varistor 115 is mounted and each terminal 123 of the commutator 120 are soldered. The assembly of the ring varistor 115, the commutator 120, and the printed board 116 is passed through the shaft 14, and the lower surface of the insulating resin 121 is abutted against the upper surface of the pedestal portion 13a of the insulator 13 and fixed.

  The coil (not shown) of the armature 100 starts winding with the end of a magnet wire (not shown) first being wound around the wiring pattern 1191 on a predetermined arm portion 116 a of the printed circuit board 116, and the respective protrusions of the armature core 111. A coil is formed by winding from above the arm portion 13 b of the insulator 13 that is placed on the pole 12, and winding it around a predetermined wiring pattern 1191.

  Hereinafter, still another embodiment of the present invention will be described.

  FIG. 9 is an exploded perspective view showing the structure of the armature of the DC brush motor according to the third embodiment of the present invention.

  In addition, in the armature 200 of this embodiment, since the structure around the armature core 211 is the same as that of the armature core 11 shown in FIG. 1, the detailed description will be given below using the same reference numerals as those in FIG. Omitted. Since the structure of the ring varistor 215 is the same as that of the ring varistor 15 shown in FIG. 6, the detailed description will be omitted below using the same reference numerals as those in FIG.

  As shown in FIG. 9, the armature 200 of this embodiment covers the insulator 13 from above and below the armature core 211, and further has a cylindrical insulating resin 221 and a commutator piece 222 provided on the outer periphery thereof. And a ring varistor 215 and a printed circuit board 216, which are configured to penetrate through a shaft 14 which is a rotating shaft. When the armature 200 is a rotor, a permanent magnet disposed facing the rotor, a brush for supplying an electric current from the outside, and a bearing for fixing the rotor are generally used. Since the configuration is the same as that of a brushed DC motor, description and drawings are omitted. Also, the coil wound around the salient pole of the armature core 211 is not shown in FIG.

  The commutator 220 includes twelve commutator pieces 222 corresponding to the salient poles 12 of the armature core 211, and each commutator piece 222 has a terminal 223 projecting radially outward and a radial direction. It has a fixing piece protruding inward (not shown because it is similar to the fixing piece 25 in FIG. 2), and has a substantially cylindrical shape with a hole in the center and is resin-molded against the insulating resin 221 The fixed piece of the commutator piece 222 is fixed.

  10 is a plan view of the printed circuit board 216 shown in FIG. 9, (a) is a view showing the lower surface in FIG. 9, and (b) is a view showing the upper surface in FIG. 9.

  The printed circuit board 216 formed in an annular shape has wiring patterns (printed patterns) formed on both sides, and a predetermined one of twelve commutator pieces 222 is provided on one side (the side shown in FIG. 10B). Form a circumferential wiring pattern that short-circuits so that the commutator pieces have the same potential (predetermined segments of the commutator have the same potential), and on the other surface (the surface shown in FIG. 10A) Form 12 wiring patterns 2191 extending radially so as to connect the electrode 15 b of the ring varistor 215 and the commutator piece 222.

  10A, twelve protruding electrodes 2161 are provided on the outer side in the circumferential direction of the printed circuit board 216, and twelve land portions 2181 are provided on the inner side in the circumferential direction. The protruding electrodes 2161 and the land portions 2181 are respectively provided. Are electrically connected by a wiring pattern 2191. The protruding electrode 2161 protrudes outside the outer periphery of the printed board 216.

  The connection structure between the wiring patterns 2201, 2202, 2203 and the wiring pattern 2191 by the through holes 2171 of the printed board 216 is the same as the through holes 171 of the printed board 16 shown in FIG. Omitted.

  In the present embodiment, as shown in FIG. 9, the surface of the ring varistor 215 provided with the electrode 15b is the lower surface, and the other surface of the printed board 216 (the surface shown in FIG. 10A) is the lower surface. Each of the twelve electrodes 15b and each of the twelve protruding electrodes 2161 are aligned in the circumferential direction, and each is electrically connected by soldering over the thickness of the varistor element 15a. A ring varistor 215 is mounted on

  Also, each land portion 2181 of the printed circuit board 216 on which the ring varistor 215 is mounted is connected to each terminal 223 of the commutator 220 by soldering. The assembly of the ring varistor 215, commutator 220, and printed board 216 is passed through the shaft 14, and the lower surface of the insulating resin 221 is abutted against the upper surface of the pedestal portion 13a of the insulator 13 and fixed.

  The coil (not shown) of the armature 200 starts to wind by winding the end of a magnet wire (not shown) around a predetermined protruding electrode 2161 of the printed circuit board 216, and covers each of the salient poles 12 of the armature core 211. The coil is wound from above the arm portion 13b of the insulator 13 and is wound around a predetermined protruding electrode 2161.

  According to the present invention, it is possible to eliminate the short-circuit line that is necessary in the invention described in Patent Document 1, and the assembly work time of the rotor can be omitted by using the printed circuit board.

  Further, according to the present invention, a ring varistor for preventing spark discharge can be easily mounted on a printed board.

  The preferred embodiments of the present invention have been described above. However, the embodiments are not limited to the above, and various modifications and combinations can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Armature 11 Armature core 12 Salient pole 12a Arm part 13 Insulator 13a Base part 13b Arm part 13c Through-hole 14 Shaft 15 Ring varistor 15a Varistor element 15b Electrode 16 Printed circuit board 20 Commutator 21 Insulating resin 22 Commutator piece 23 Terminal 24 Riser 25 fixed piece

Claims (6)

An armature core having a plurality of salient poles, a coil wound around the salient poles, a commutator connected to the coils, a brush slidably contacting the commutator and supplying a current, and connected to the commutator In a DC brush motor having a varistor having an electrode and a permanent magnet arranged to face the salient pole,
A DC brush motor, comprising: a printed circuit board on which a printed pattern for short-circuiting the same potential segments of the commutator and a printed pattern for connecting an electrode of the varistor to the commutator are printed. On one surface of the printed circuit board, a printed pattern that short-circuits the same potential segments of the commutator is printed,
The motor with a DC brush according to claim 1, wherein a printed pattern for connecting an electrode of the varistor to the commutator is printed on the other surface of the printed board. The printed circuit board has a through hole for electrically connecting the printed pattern on the one surface and the printed pattern on the other surface;
The commutator terminal is connected to the printed pattern on the other side of the printed circuit board, and the printed pattern on the other side is electrically connected to the printed pattern on the one side through the through hole. The motor with a DC brush according to claim 2, wherein a short circuit is performed between segments of the same potential of the commutator.   4. The motor with a DC brush according to claim 1, wherein the printed circuit board has an arm portion that protrudes radially outward. 5. The printed circuit board is
4. The method according to claim 1, further comprising a protruding electrode connected to a printed pattern connecting the electrode of the varistor to the commutator and protruding outward from an outer periphery of the printed circuit board. 5. The motor with a DC brush as described.   6. The motor with a DC brush according to claim 1, wherein the commutator is a cylindrical commutator.

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