JP2010258192A - Coil bobbin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide motor winding, which can be made small in coil external diameter and which can solve the problems of insulation defects. <P>SOLUTION: A coil bobbin includes: a bobbin body having a coil wound around an outer periphery of a core portion in a multilayer array, the bobbin body having the cylindrical core portion, a flange formed at an end of the core portion integrally with the core portion, and a terminal portion for processing a terminal of the coil; and a coil formed by arraying and winding a conductor around the core portion in an axial direction. Then, a start portion conductor as one end of the coil and an end portion conductor as the other end are fixed to the terminal respectively, and while the total number of winding layers of the coil is N layer (even), the number of turns of the outermost-layer N layer is less than M-2 in which M is the number of turns of other even-numbered layers, the number of turns of the second layer (N-1) counted from the outermost-layer N layer is less than L-1 in which L is the number of turns of other odd-numbered layers. The coil end portion conductor is arranged at a space portion formed of the flange and the coil formed by the winding, and is fixed to the terminal portion included in the flange. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a coil bobbin, and relates to a coil bobbin formed by winding a coil around a bobbin body.

  In recent years, the application of stepping motors has been expanded due to the ease of control, and further downsizing has been demanded along with the trend toward downsizing and higher performance of devices.

  For example, in a stepping motor comprising a fixed coil and an exciting stator on the outer periphery, a rotor, a pair of bearings and a bearing mounting plate for holding the coil at the center, the coil is wound around the outer periphery of the core by multi-layer aligned winding. A bobbin body comprising: a cylindrical core part; a flange formed integrally with the core part only at one end of the core part; and a terminal part for fixing the terminal of the coil; There is known a structure in which a coil in which the conducting wire is wound in an axial direction on the winding core, a starting end conducting wire that is one end of the coil, and a terminal conducting wire that is the other end are fixed to the terminal.

  Further, in this structure, the terminal conductor, which is the other end of the coil, is separated from the coil in the tangential direction and fixed to a predetermined terminal along the flange surface. Normally, the radial position where the outermost terminal wire of the outermost layer of the coil on the flange side where the terminal is located is tangentially separated from the coil is determined by the outermost diameter of the coil. The outer yoke provided outside the coil is provided with a notch for passing the conducting wire.

  FIG. 8 is a view showing a state of winding a conventional coil, and is a side sectional view showing the form of the coil when the winding width of the bobbin core portion 5a is insufficient. Moreover, FIG. 9 is a figure which shows a mode that the conventional coil is wound, Comprising: It is a sectional side view which shows the form of a coil when the winding width of the bobbin core part 5a is left.

  8 and 9, 1 is a winding shaft of the winding machine, 2 is an outer shaft portion, 3 is an inner shaft portion, 5a is a winding core portion, 5b is a flange, and 5c is A terminal part, 6 is a terminal pin, 7 is a coil, 8 is a conductor, 8a is a terminal part conductor, 15 is an outer yoke, and 15b is a notch.

  Winding disturbance during normal coil winding is due to variations in the length of the bobbin core 5a and the outer diameter of the winding conductor 8. If the winding width of the bobbin core part 5a is insufficient when the number of turns is determined, as shown in FIG. 8, when the terminal end conductor 8a of the winding comes to the next layer, it is provided outside the conductor 8 of the coil 7. The gap between the outer yoke 15 and the outer yoke 15 is reduced, and the inner diameter of the outer yoke interferes with the outer diameter of the coil, which may cause contact, insulation failure, and disconnection.

  When the winding width of the bobbin winding core portion 5a is excessive, as shown in FIG. 9, the terminal end conductor 8a which is the terminal portion of the conductor 8 is separated from the flange 5b where the terminal pin 6 is provided. Since the conductive wire 8a is separated from the coil 7 and directly connected to the terminal pin 6 of the predetermined terminal portion 5c, the conductive wire 8a is fixed to the terminal pin 6 of the predetermined terminal portion 5c without being along the flange 5b. May come into contact with the cutout portion 15b of the outer yoke 15 provided on the outer side of the wire, causing insulation failure and disconnection.

  Japanese Patent Laid-Open No. 2004-133561 absorbs variations in the wire diameter and bobbin size of a coil lead wire to enable multilayer aligned winding.

  In Patent Document 2, a lead-out groove formed with an inclined surface that guides a starting portion of a coil conductor is provided in a bobbin collar to prevent winding disturbance at the beginning of winding.

JP 2008-294120 A JP 2003-86434 A

  FIG. 10 is a diagram illustrating an angle formed by the crossover portion and the parallel lines of the terminal pins. Usually, the position where the terminal conductor 8a is separated from the coil 7 in the tangential direction as the position where the terminal conductor 8a on the outermost layer of the coil 7 on the flange 5b side where the terminal 5c is located is tangentially smaller in the radial direction is smaller. The angle formed by the connecting wire portion between the lead wire and the terminal pin 6 and the parallel wire of the terminal pin 6 is reduced, the inner diameter of the outer yoke 15 provided outside the coil 7 can be reduced, and the wire passage The notch 15b for the purpose can be reduced in the circumferential direction. Therefore, it is desirable that the position where the outermost terminal conductor 8a of the coil 7 on the flange 5b side with the terminal portion 5c is separated from the coil 7 in the tangential direction is reduced in the radial direction.

  Further, in the case as shown in FIG. 9 where the winding width of the bobbin winding core portion 5a is excessive, the notch portion 15b can be moved in the axial direction by placing the terminal end conductor 8a in the space 7c of the coil 7 close to the flange 5b. It can be shortened, reducing the possibility of entering dust and improving the dustproof effect. However, there is a problem that the current winding method cannot be downsized.

  Further, conventionally, since the end of the conductor does not come to a predetermined position due to slight winding disturbance, a gap taking into account winding disturbance has been set to prevent insulation failure.

  Even the inventions described in Patent Document 1 and Patent Document 2 still have similar problems.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a motor winding capable of reducing the outer diameter of the coil and solving the problem of poor insulation.

  FIG. 7A shows a form of a conventional aligned winding coil 7. Moreover, FIG.7 (b) shows the form of the aligned winding coil of this invention, and FIG.7 (c) shows the form of the termination | terminus part conducting wire of the aligned winding coil of a semi-invention.

  In order to solve the above-mentioned problem, the present invention is configured such that the total number of winding layers of the coil 7 is N layers (N is an even number) and the number of turns of the outermost layer N layer 7a is that of other even layers as shown in FIG. The number of turns M is less than M-2, the number of turns of the second layer (N-1 layer) 7b from the outermost layer N is less than L-1 with respect to the number of turns L of the other odd layers, and the flange 5b And a space 7c formed by the coil 7 formed by winding in the axial direction outside the winding core portion 5a by the bobbin holding stopper 4 of the winding machine, and as shown in FIG. The partial conductor 8a is disposed in the space 7c and is fixed to the terminal pin 6 provided in the terminal portion 5c of the bobbin main body 5 (see FIG. 1).

  Reference numeral 1 denotes a winding shaft of the winding machine. The winding shaft 1 is inserted into the outer shaft portion 3 so that the flange 5b of the bobbin main body 5 is brought into contact with the side surface of the outer shaft portion 2. At this time, the bobbin main body 5 is scattered on the inner shaft portion 3 of the winding machine, the bobbin main body 5 is fixed by the bobbin holding stopper 4, and the conducting wire 8 is wound.

  ADVANTAGE OF THE INVENTION According to this invention, the motor winding which can make a coil outer diameter small and can eliminate the problem of insulation failure can be provided. In addition, since the outer diameter of the coil 7 is reduced, the inner diameter of the outer yoke 15 outside the coil 7 can be reduced, leading to a reduction in the size of the outer yoke 15.

  That is, according to the present invention, by accommodating the coil terminal end conductor 8a in the space 7c, space saving can be achieved and the outer diameter of the coil can be reduced.

  Further, according to the present invention, by accommodating the coil terminal portion conducting wire 8a in the space 7c, the distance between the outer diameter of the coil and the outer outer yoke 15 can be secured, which is advantageous in insulation, and there is a problem of poor insulation. Can be eliminated.

The form of the coil bobbin 10 of this invention is shown. 1 is a perspective view showing an embodiment of a coil bobbin 10 according to the present invention. FIG. 3 is a perspective view showing a claw pole type PM (permanent magnet) stepping motor 11 using a coil bobbin 10 in which a coil 7 is wound around the bobbin main body 5 shown in FIG. 2. It is sectional drawing of the stepping motor 11 shown in FIG. It is a perspective view which decomposes | disassembles and shows the stepping motor 11 shown in FIG. Coil bobbin with flanges at both ends (A) shows the form of the conventional aligned winding coil. (B) shows the form of the aligned winding coil of the present invention. (C) shows the form of the terminal conductor of the aligned winding coil of the semi-invention. The form of a coil in case the winding width of the conventional bobbin winding core part 5a is insufficient is shown. The form of the coil when the winding width of the conventional bobbin winding core part 5a is left is shown. The angle formed by the crossover portion and the parallel line of the terminal pin is shown. FIG. 3 is a perspective view showing the bobbin 10 according to the present invention from another angle of FIG. 2.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration of a coil bobbin 10 of the present invention.

  In the following description, the same reference numerals are assigned to the same components as those in FIGS. 8 and 9 described above. That is, in FIG. 1, 5b is a flange, 5c is a terminal portion, 6 is a terminal pin, 7 is a coil, 7c is a space formed by the flange 5b and the coil 7, and 8 is a conductor. 8a is a terminal conductor, 15 is an outer yoke, and 15b is a notch.

  FIG. 1 is a cross-sectional view of a flange 5b side of a coil bobbin 10 formed by winding a coil 7 around a bobbin body 5 on the terminal portion 5c side. The outer yoke 15 is omitted in some drawings.

  FIG. 2 is a perspective view showing an embodiment of the coil bobbin 10 according to the present invention.

  The bobbin main body 5 is formed of a nonmagnetic synthetic resin (for example, liquid crystal polymer), and a flange 5b is formed on only one end of a cylindrical core 5a by integral molding with the core 5a. A flange is not provided at the other end of 5a. A terminal portion 5c is formed integrally with the flange 5b, and a plurality (two, 6a, 6b in this embodiment) of terminal pins 6 are implanted in the terminal portion 5c.

  7, 8, and 9, reference numeral 1 denotes a winding shaft of the winding machine. The winding shaft 1 includes an outer shaft portion 2 and an inner shaft portion 3 inserted inside the outer shaft portion 2. 4 is a stopper for holding the bobbin of the winding machine.

  At the time of winding, the bobbin main body 5 is inserted into the inner shaft portion 3 of the winding shaft 1 of the winding machine, and the flange 5 b of the bobbin main body 5 is brought into contact with the side surface of the outer shaft portion 2. At this time, the bobbin main body 5 is structured to be fitted to the inner shaft portion 3 of the winding machine.

  Then, the bobbin presser stopper 4 is moved, and the flange 5b and the bobbin presser stopper 4 are adjusted and arranged at a predetermined distance.

  FIG. 3 is a perspective view showing a claw pole type PM (permanent magnet) stepping motor 11 using a coil bobbin 10 in which a coil 7 is wound around the bobbin main body 5 shown in FIG.

  FIG. 4 is a sectional view of the stepping motor 11 of FIG.

  FIG. 5 is an exploded perspective view of the stepping motor 11 shown in FIG.

  The stepping motor 11 includes a stator portion 12 and a rotor portion 13, and the stator portion 12 is configured by fixing two stator subassemblies 14 in a back-to-back manner to form a two-phase stator.

  The rotor part 13 is rotatably arranged on the inner periphery of the stator part 12, and the rotor part 13 is composed of a shaft 17 and a rotor magnet 18 (for example, a rare earth bonded magnet). Multi-pole magnetized in the direction. The shaft 17 and the rotor magnet 18 are fixed by an adhesive, and the shaft 17 is rotatably supported by a bearing 21 attached to the front plate 19 and a bearing 21 attached to the rear plate 20.

  The stator subassembly 14 includes a cup-shaped outer yoke 15, an inner yoke 16, and a coil bobbin 10 in which a coil 7 is wound around the bobbin main body 5.

  The outer yoke 15 is made of a soft magnetic material, and has a plurality of comb-like pole teeth 15a on the inner periphery thereof, and a notch 15b for projecting the terminal portion 5c of the bobbin 5 is formed on a part of the outer periphery. ing.

  The inner yoke 16 is made of the same soft magnetic material as that of the outer yoke 15, and has a plurality of comb-shaped pole teeth 16a on the inner peripheral edge thereof. The pole teeth 15a and the pole teeth 16a are alternately meshed so as to have a phase difference of 180 degrees in electrical angle, and are opposed to the rotor magnet 18 through a predetermined gap.

  Further, the two stator subassemblies 14 are adjusted to positions where they have an electrical angle phase difference of 90 degrees.

  The bobbin main body 5 has a configuration in which a flange 5b is formed only at one end of the core 5a.

  Of course, the coil bobbin 10 used in the present invention is not limited to the structure of the stepping motor shown in FIG. 3, and the bobbin body 5 may have both end flanges.

  Here, an embodiment of the coil bobbin according to the present invention will be described in detail with reference to FIG. 1, FIG. 7 (b) and FIG. 7 (c).

  By the winding of the present embodiment, the total number of winding layers of the coil 7 is set to N layers (N is an even number), the number of turns of the outermost layer N layer 7a is less than M-2 with respect to the number M of turns of the other even layers, The number of turns of the second layer (N-1 layer) 7b from the outermost layer N is less than L-1 with respect to the number of turns L of the other odd layers and is wound by the flange 5b and the stopper 4 for holding the bobbin of the winding machine. Since the terminal end conductor 8a is disposed in the space 7c formed by the coil 7 formed by winding in the axial direction outside the core 5a, the outer side is at least radially smaller than the N layer which is the outermost layer of the coil 7. In this case, the smaller the position in which the terminal conductor 8a is separated from the coil 7 in the tangential direction in the radial direction, the conductor between the terminal pins 6 from the position in which the terminal conductor 8a is separated from the coil 7 in the tangential direction. The angle between the crossover and the parallel line of the terminal pin 6 is Since fence, it is possible to reduce the notch portion 15b for miniaturization of the outer diameter of the outer yoke 15 provided on the outside of the coil 7 can be, and termination conductor 8a passes in the circumferential direction.

  The total number of coil winding layers is an even number. The start end conductor 8b, which is the beginning of coil winding, is wound around the start end conductor fixing terminal pin 6b provided on the flange 5b of the bobbin body 5, and then wound. Since the terminal end conductor 8a of the conductor 8 is returned and fixed to the terminal end conductor fixing terminal pin 6a provided on the flange 5b, the outermost layer is an even layer.

  Further, even in the case of FIG. 9 where the winding width of the bobbin winding core portion 5a is insufficient, the notch portion 15b can be moved in the axial direction by placing the terminal end conductor 8a in the space 7c of the coil 7 close to the flange 5b. It can be shortened and the dustproof effect is improved.

  The bobbin body 5 removed from the winding machine is soldered by immersing the terminal pin 6 with the conductor 8 entangled in the molten solder bath.

  As an example of the present invention, the winding procedure will be described with reference to FIGS. 2, 7B and 7C, taking the case where the total number of winding layers (N) is four as an example.

  1) The starting end conducting wire 8b, which is the beginning of winding, is fixed to the starting end conducting wire fixing terminal pin 6b by tangling.

  2) Winding is started from the position of the core part 7d on the flange 5b side so that the conductor 8 is along the flange 5b.

  3) Wind the first layer (N-3) with L turns and pitch P.

  4) Fold back the bobbin holding stopper 4 side.

  5) Wind the second layer (N-2) with M turns and pitch P.

  6) Provide a gap of 1P when turning back at the flange 5b (7e is not wound).

  7) The third layer (N-1) 7e is wound at L-1 number of turns and pitch P from the point advanced by 1P without winding.

  8) Turn the bobbin back at the stopper 4 side for holding the bobbin.

  9) The fourth layer (N) is wound with M-2 turns and pitch P.

  10) At least the outermost layer falls into 7c by the space formed by winding the flange portion 5b and M-2 at the winding pitch 2P, and the second layer from the outermost layer by L-1 winding. Wind it.

  11) The terminal conductor 8b is fixed to the terminal conductor 6a by fixing the terminal conductor 8b along the flange 5b.

  The conducting wire 8 used in the present embodiment is a self-bonding wire that is fused by heating, and is heated with a hot air heater or the like to fuse the conducting wires 8 together. Of course, the conductive wires 8 may be fused together.

  FIG. 6 is a cross-sectional view of a coil bobbin 23 that is another embodiment of the present invention and includes flanges 5b on both sides of the core 5a of the bobbin body 22. As shown in FIG. In this case, the conducting wire 8 may not be a self-bonding wire.

  The present invention can also be applied to the case where flanges 5b are provided on both sides of the core 5a as shown in FIG.

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

  FIG. 11 is a perspective view showing the bobbin body 5 according to the present invention from another angle of FIG.

  In the present embodiment, the groove 22 is provided on the side surface from the terminal portion 5c of the bobbin main body 5 to the flange 5b, and the lead wire 8b that is the winding start end is entangled with the start end lead wire fixing terminal pin 6b. Is fitted into the groove 22 and guided to the core 5a. Furthermore, it winds and the coil 7 is formed in the core part 5a. When the groove 22 is provided as in this embodiment, the lead wire is guided in the groove 22 so that it does not protrude at the beginning of winding of the conducting wire 8, preventing turbulence and more reliable alignment. Winding can be achieved, and the terminal conductor 8a can be brought closer to the flange 5b.

DESCRIPTION OF SYMBOLS 1 Winding shaft 2 Outer shaft part 3 Inner shaft part 4 Bobbin press stopper 5 Bobbin main body 5a Winding core part 5b Flange 5c Terminal part 6 Terminal pin 6a Terminal part lead fixing terminal pin 6b Start part lead fixing terminal pin 7 Coil 7a Outermost layer N layer 7b N-1 layer 7c Space formed by L-1 and M-2 7d First layer winding start position 7e Third layer winding start position 8 Conductor 8a Termination conductor 8b Start end conductor 10 Coil bobbin 11 Stepping motor 12 Stator portion 13 Rotor portion 14 Stator assembly 15 Outer yoke 15a Pole teeth 15b Notch portion 16 Inner yoke 16a Pole teeth 17 Shaft 18 Rotor magnet 19 Front plate 20 Rear plate 21 Bearing 22 Groove

Claims (5)

A bobbin main body that winds a coil around the outer periphery of the core by multilayer aligned winding, a cylindrical core, a flange formed integrally with the core at the end of the core, A bobbin body having a terminal portion for processing the end of the coil;
A coil in which a conductive wire is aligned and wound in the axial direction on the winding core;
With
A starting end conductor that is one end of the coil and a terminal conductor that is the other end are fixed to the terminals, respectively.
The total number of winding layers of the coil is N layers (even number), and the number of turns of the outermost layer N layer is less than M-2 with respect to the number M of turns of other even layers, and the second layer (N− The number of turns of 1) is less than L-1 with respect to the number of turns L of the other odd layers,
The coil bobbin characterized in that the coil terminal portion conducting wire is disposed in a space portion formed by the flange and a coil formed by the winding, and is fixed to a terminal portion provided in the flange. The coil bobbin according to claim 1, wherein the flange is formed integrally with the core part at both ends of the core part.   The coil bobbin according to claim 1 or 2, wherein the coil bobbin is used in a stepping motor.   The coil bobbin according to any one of claims 1 to 3, wherein the conducting wire is a self-bonding wire.   The coil bobbin according to any one of claims 1 to 4, wherein a groove for guiding the conducting wire is provided on a side surface of the bobbin main body from the terminal portion to the flange.