JP2009077622A - Stepping motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stepping motor which can ensure a sufficiently large interval between a plurality of terminal pins provided on a terminal block. <P>SOLUTION: A plurality of terminal pins 21a-21d arranged on a terminal block 20 consist of first terminal pins 21a and 21c to which one winding terminals 10a and 11a of drive coils 10 and 11 are bound, and second terminal pins 21b and 21d to which the other winding terminals of drive coils 10 and 11 are bound wherein the first terminal pins 21a and 21c and the second terminal pins 21b and 21d are arranged on the terminal block 20 along the axial direction of a rotating shaft 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stepping motor, and more particularly to a stepping motor having a plurality of terminal pins with which winding ends of a coil are wound.

  Some conventional stepping motors are provided with a terminal block on the outer peripheral side thereof, and this terminal block is provided with a plurality of terminal pins on which coil winding terminals are wound. These terminal pins are arranged side by side in a direction orthogonal to the output shaft of the stepping motor (see Patent Document 1).

JP 2000-102204 A

  In the stepping motor shown in Patent Document 1, as the motor diameter decreases, the distance between the terminal pins naturally becomes narrower. However, if the size of the terminal block is reduced with the miniaturization of the stepping motor, the nozzle of the automatic coil device for winding the winding cannot pass between the terminal pins, and the coil is wound around the terminal pins. There is a problem that the line terminal cannot be automatically tied. Therefore, since the terminal block cannot be reduced in size, there is a risk that the stepping motor may be reduced in size.

  Further, when the distance between the terminal pins becomes narrow, there is a problem in that a land having a size required for solder application cannot be formed on a power supply substrate (flexible wiring substrate) connected to these terminal pins. .

  To solve such a problem, as shown in FIG. 8A, by arranging the terminal pins 101a to 101d in two rows orthogonal to the output axis X of the stepping motor 100, the terminal pins 101a to 101d are arranged. A desired interval can be secured. However, with such an arrangement, as shown in FIG. 8B, the power supply substrate 110 connected to the terminal pins 101a to 101d protrudes from the longitudinal direction of the motor main body (stator) 102 (see FIG. b), the problem is that the space required for mounting the stepping motor 100 becomes large.

  In view of the above problems, an object of the present invention is to provide a stepping motor capable of ensuring a sufficiently large interval between a plurality of terminal pins provided on a terminal block. Another object of the present invention is to provide a stepping motor in which the mounting space is not narrowed by the power supply substrate connected to the terminal pins.

  In order to solve the above problems, a stepping motor according to the present invention includes a rotor having a rotating shaft and a permanent magnet provided on the outer periphery of the rotating shaft, a stator having a stator core with pole teeth standing upright, and the pole teeth. In a stepping motor comprising a coil disposed on the outer periphery, a terminal block disposed on the outer peripheral side of the stator, and a plurality of terminal pins disposed on the terminal block, the plurality of terminal pins are one of the coils. The first terminal pin with which the winding terminal is entangled and the second terminal pin with which the other winding terminal of the coil is entangled, and the first terminal pin and the second terminal pin have the rotating shaft The gist of the invention is that the terminal block is arranged along the axial direction.

  According to the present invention, since the terminal pins are arranged along the axial direction of the rotation axis of the stepping motor, a sufficiently large interval can be secured between the first terminal pins and the second terminal pins. As a result, the nozzle of the automatic coil device for winding the coil winding terminal around the terminal pin cannot pass between the terminal pins, and the size necessary for solder application on the power supply substrate connected to the terminal pin. It is possible to prevent a problem that a space for forming the land cannot be secured.

  In this case, it is preferable that the first terminal pin and the second terminal pin are arranged at different positions in the direction orthogonal to the axial direction of the rotating shaft. If comprised in this way, the space | interval of a 1st terminal pin and a 2nd terminal pin can be enlarged further. The first terminal pin and the second terminal pin may be arranged at different positions so as to sandwich the axis of the rotary shaft in the direction perpendicular to the axial direction of the rotary shaft. This is preferable for increasing the distance between the terminal pin and the second terminal pin.

  The terminal block is formed with a first notch corresponding to the first terminal pin and a second notch corresponding to the second terminal pin at a peripheral portion thereof, and the first notch is formed. The notch and the second notch are each formed at a position adjacent to the corresponding terminal pin in a direction orthogonal to the axial direction of the rotating shaft of the terminal block, and one winding terminal of the coil Is pulled out from the first notch and entangled with the first terminal pin, and the other winding terminal of the coil is pulled out from the second notch and connected to the second terminal pin. It is more suitable if it is entangled. In other words, the wire that forms the coil can be wound around the terminal pin once it has been passed over the notch of the terminal block, so that it is easy to bind the terminal of the winding terminal to the terminal pin. Can be tightly bound to the terminal pin. In addition, since one and the other winding terminals do not cross each other, disconnection or short circuit of the winding terminals can be prevented.

  In this case, it is preferable that the first cutout portion and the second cutout portion are tapered from the peripheral portion of the terminal block toward the terminal pin side. Thereby, it becomes easy to hook the electric wire which forms a coil on a notch part. In addition, since the tapered shape of the notch is formed toward the terminal pin side, it leads to improvement in workability of tangling to the terminal pin of the winding terminal and prevention of disconnection of the winding terminal.

  Further, the first terminal pin and the second terminal pin are arranged at different positions so as to sandwich the axis of the rotary shaft in a direction perpendicular to the axial direction of the rotary shaft, and are provided on the terminal block. The first notch and the second notch are notched in opposite directions in the circumferential direction of the stator at positions corresponding to the first terminal pin and the second terminal pin. One winding terminal of the coil and the other winding terminal of the coil are drawn out from opposite directions with respect to the circumferential direction of the stator with respect to the first terminal pin and the second terminal pin. It is preferable to configure as described above. Thereby, when each winding terminal is entangled with a terminal pin, it does not contact and cross each other, and it is possible to prevent disconnection of the winding terminal and short circuit due to contact.

  The first terminal pin is positioned on the output side of the second terminal pin, and the first terminal pin and the second terminal pin have first pin connection holes at positions corresponding to the first terminal pin and the second terminal pin, respectively. And a power supply board in which a second pin connection hole is formed, and the distance between the output-side end face of the power supply board and the first pin connection hole in the axial direction of the rotating shaft and the reaction of the power supply board The distance between the output side end face and the second pin connection hole is determined by the distance between the output side end face of the stator and the first terminal pin and the distance between the counter output side end face of the stator and the second terminal pin, respectively. Small is preferable. By adopting such a configuration, the power supply board attached to the stepping motor does not protrude from the stator (motor body part), and it can be prevented that the space required for the attachment of the stepping motor becomes large. This leads to downsizing of the equipment to which the stepping motor is attached.

  The stator core is formed with a terminal block holding portion for holding the terminal block. The terminal block holding portion extends from the outer peripheral end of the stator in the axial direction of the rotating shaft and contacts the end surface of the terminal block. It is preferable. This prevents an inadvertent inclination of the terminal block, in particular, the inclination of the terminal block in the rotation axis direction and the inclination in the stator radial direction, and facilitates processing for placing and connecting the power supply board to the terminal block. .

  The stator includes two stator sets, the first terminal pins and the second terminal pins arranged in one stator set, and the first terminal pins arranged in the other stator set and the The second terminal pins are preferably arranged on the terminal block along the axial direction of the rotating shaft. Thereby, even if it is a stepping motor which has a two-phase stator, the space | interval between each terminal pin is fully securable.

  In this case, the first terminal pin and the second terminal pin arranged in the one stator set, and the first terminal pin and the second terminal pin arranged in the other stator set are It is preferable that they are arranged at different positions in the direction orthogonal to the axial direction of the rotating shaft. Specifically, the first terminal pin and the second terminal pin of each of the two sets of stators sandwich the axis of the rotation shaft in a direction perpendicular to the axis direction of the rotation shaft. It is preferable that they are arranged at different positions. By adopting such a configuration, in the stepping motor having a two-phase stator, the distance between the first terminal pin and the second terminal pin can be further increased.

  The terminal block is formed of a first terminal block disposed in the one stator set and a second terminal block disposed in the other stator set, and the first terminal block and The second terminal block is preferably formed separately. By adopting such a configuration, even when another member such as a coil bobbin is arranged on the outer periphery of the pole tooth on the inner periphery of the coil, the terminal pin can be arranged along the axial direction of the rotation axis of the stepping motor. it can. In addition, the assembly of the stepping motor is facilitated, leading to a reduction in manufacturing cost.

  According to the stepping motor according to the present invention, since the plurality of terminal pins are arranged along the axial direction of the rotation shaft of the stepping motor, a sufficient interval between the terminal pins can be ensured. In addition, since the power supply board can be formed in a size that does not protrude from the motor case, it is possible to prevent a space required for the arrangement of the motor from being increased by the power supply board.

  Hereinafter, a stepping motor according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional side view for explaining the outline of the stepping motor according to the first embodiment of the present invention, FIG. 2 is a top view of the stepping motor, and FIG. 3 is a state where a flexible wiring board to be described later is attached. It is a top view of the stepping motor for carrying out.

  As shown in FIG. 1, a stepping motor 1 includes a rotor 4 having a rotating shaft 2 and a rotor magnet (permanent magnet) 3 fixed to the rotating shaft 2, and a stator disposed opposite to the rotor magnet 3 via a gap. 5 is provided.

  The rotating shaft 2 is rotatably supported by the first bearing 6 and the second bearing 7. The rotor magnet 3 is composed of a substantially cylindrical permanent magnet.

  The stator 5 has a two-phase structure including a first stator set 8 and a second stator set 9 that is arranged so as to overlap the first stator set 8 in the axial direction.

  The first and second stator sets 8 and 9 are respectively composed of inner stator cores 12 and 14 and outer stator cores 13 and 15 sandwiching the drive coils 10 and 11 between the inner stator cores 12 and 14. The stepping motor of the present embodiment is a bobbinless type stepping motor that does not use a coil bobbin, and the drive coils 10 and 11 use air-core coils.

  On the inner peripheral side of the drive coils 10, 11, a plurality of pole teeth 12 a, 14 a formed on each of the inner stator cores 12, 14 and a plurality of pole teeth 13 a, 15 a formed on each of the outer stator cores 13, 15, respectively. Are arranged so as to interleave each other. Therefore, in the present embodiment, the annular drive coil 10 is disposed on the outer periphery of each pole tooth 12a, 13a in the inner stator core 12 and the outer stator core 13 of the first stator set 8, and similarly the second stator set. An annular drive coil 11 is disposed on the outer periphery of each of the pole teeth 14 a and 15 a in the inner stator core 14 and the outer stator core 15.

  In the inner stator cores 12 and 14 of the first and second stator sets 8 and 9 described above, a plurality of pole teeth 12a and 14a are respectively formed upright in an annular shape from the inner peripheral edge at substantially equal intervals. Similarly, a plurality of pole teeth 13a and 15a are formed on the outer stator cores 13 and 15 in an annular shape at substantially equal intervals from the inner periphery. In the present embodiment, the outer peripheral edges of the outer stator cores 13 and 15 are erected so as to cover the outer periphery of the drive coils 10 and 11 and function as motor cases, respectively. In the following description, the first motor case 16 and the second motor case 17 are portions formed by bending from the outer peripheral edges of the outer stator cores 13 and 15 so as to cover the outer periphery of the drive coils 10 and 11. The first motor case 16 and the second motor case 17 are each formed in a cylindrical shape by drawing.

  A mounting plate 18 used when the stepping motor 1 is mounted on a device is fixed to the outer stator core 13 of the first stator set 8, and the rotating shaft 2 can freely rotate on the output side. A first bearing 6 is fixed as a radial bearing to be supported on the shaft. Further, a side plate 19 is fixed to the outer stator core 15 of the second stator assembly 9, and a second bearing 7 as a radial bearing for rotatably supporting the rotary shaft 2 on the opposite side to the side plate 19 is fixed to the side plate 19. Has been. Then, one end side of the rotating shaft 2 of the rotor 4 protrudes outward (output side) from the outer stator core 13 of the first stator set 8 and serves as an output shaft for rotational driving.

  In addition, flanges 12b and 14b are provided on the base end side of the pole teeth 12a and 14a of the inner stator cores 12 and 14 so as to spread toward the outer peripheral side. The flange portions 12b and 14b are provided with holding portions 12d and 14d for fixing a terminal block 20 described later, that is, a second holding portion (positioning portion).

  On the outer peripheral side of the stator 5 having such a configuration, a terminal block 20 is provided with a plurality of terminal pins 21a to 21d with which the winding terminals 10a and 10b drawn from the drive coils 10 and 11 are entangled. Is provided.

  In the stepping motor 1 according to the present embodiment, the rotor magnet 3 is rotated by a magnetic interaction between the stator 5 and the rotor magnet 3 by applying a predetermined current to the drive coils 10 and 11 of the stator 5. As a result, the rotating shaft 2 integral therewith rotates.

  On the other hand, as shown in FIG. 2, four notches 20 a to 20 d are formed on the periphery of the terminal block 20. Further, four terminal pins 21a to 21d are attached to the terminal block 20, and a fitting hole 20f is formed at the center. The terminal block 20 is fixed to the stator 5 by fitting the terminal block holding portions 12d and 14d of the inner stator cores 12 and 14 into the fitting holes 20f.

  The terminal pins 21 a to 21 d are terminals for supplying power to the drive coils 10 and 11. The terminal pins 21a to 21d are integrally provided by insert molding when the terminal block 20 made of an insulating member is resin-molded.

  Among the terminal pins 21a to 21d arranged in this way, the winding terminals 10a and 10b drawn from the drive coil 10 are entangled with the terminal pins 21a and 21b on the first stator set 8 side. In addition, winding terminals 11a and 11b drawn from the drive coil 11 are entangled with the terminal pins 21c and 21d on the second stator assembly 9 side. Here, in the present embodiment, the terminal pins 21a and 21c (one of the first stator set 8 and the second stator set 9 in FIG. The left terminal pin) is referred to as the first terminal pin, and the terminal pins 21b and 21d (in FIG. 2, the first stator set 8 and the second stator set 9 on the right side) are wound with the other winding terminals 10b and 11b. Terminal pin) is referred to as a second terminal pin.

  Here, as is apparent from FIG. 2, the terminal pins 21 a to 21 d are provided along the axial direction (X axis) of the rotating shaft 2. In particular, in the present embodiment, the terminal pins 21 a and 21 d located outside the respective stator sets 8 and 9 are arranged outside the center position in the axial direction of the respective stator sets 8 and 9. Specifically, one terminal pin 21a, 21d in each stator set 8, 9 is located closer to the proximal end side of the pole teeth 13a, 15a of the outer stator cores 13, 15 than the flanges 12b, 14b of the inner stator cores 12, 14. The other terminal pins 21b and 21c are provided closer to the flanges 12b and 14b of the inner stator cores 12 and 14 than the flanges of the outer stator cores 13 and 15, respectively. Yes. That is, the terminal pins 21a to 21d are not arranged in an overlapping manner in the Y axis direction (left and right direction on the paper surface). Therefore, compared with the case where the terminal pins are provided along the direction orthogonal to the axis of the rotating shaft 2 (Y-axis), it is possible to secure a large arrangement space, and therefore, the interval between the terminal pins 21a to 21d is increased. It becomes possible to enlarge.

  Furthermore, the terminal pins 21a to 21d move up and down approximately the same (centering up and down in FIG. 2) about the X axis that is the axis of the rotating shaft 2, that is, so as to be separated in the up and down direction. Is provided. If arranged in this manner, the terminal pins 21a to 21d are arranged at diagonal positions with respect to the quadrangle, and therefore, compared with the case where the terminal pins 21a to 21d are arranged on a straight line, the terminal pins 21a to 21d are connected to each other. Can be further increased.

  Further, the winding terminals 10a, 10b, 11a, and 11b are wound around the terminal pins 21a to 21d by using the notches 20a to 20d described above. In the present embodiment, among the cutout portions 20a to 20d, 20a and 20c are referred to as first cutout portions, and 20b and 20d are referred to as second cutout portions.

  As can be seen from FIG. 2, one winding terminal 10a of the drive coil 10 is entangled with the terminal pin 21a after the electric wire of the drive coil 10 is once hooked on the notch 20a. The other winding terminal 10b of the drive coil 10 is entangled with the terminal pin 21b after the electric wire of the drive coil 10 is once hooked on the notch 20b. Similarly, the winding terminal 11a of the drive coil 11 is hooked on the notch 20c, and the winding terminal 11b is hooked on the notch 20d, and then is wound on the terminal pins 21c and 21d, respectively.

  That is, the winding terminals 10a, 10b, 11a, and 11b entangled with the terminal pins 21a to 21d are notched portions (formed along the Y-axis direction) formed at the closest positions of the terminal pins 21a to 21d. In the circumferential direction of the stator 5 (first and second motor cases 16, 17) from the notches 20 a to 20 d, they are drawn out in the reverse direction (upward or downward in the Y-axis direction) and entangled. .

  Thus, by forming the notches 20a to 20d in the positions adjacent to the terminal pins 21a to 21d erected on the terminal block, the drive coils 10 and 11 are temporarily provided in these notches 20a to 20d. The winding terminals 10a, 10b, 11a, and 11b can be tied to the terminal pins 21a to 21d after the electric wire is hooked. That is, since one of the corresponding notches 20a to 20d can be used for each of the terminal pins 21a to 21d, the terminal pins 21a to 21a of the winding terminals 10a, 10b, 11a, and 11b are used. The binding process to 21d becomes easy. In addition to this, the winding terminals 10a, 10b, 11a, 11b are drawn out from the notches 20a-20d formed at the nearest positions of the terminal pins 21a-21d, and are thus entangled. The disconnection and the short circuit due to the contact of 10b, 11a, and 11b can be prevented, and the winding terminals 10a, 10b, 11a, and 11b can be tightly bound by the terminal pins 21a to 21d.

  Further, as is apparent from FIG. 2, the notches 20a to 20d are tapered from the peripheral portions (inlet portions 201a to 201d) of the terminal block 20 toward the corresponding terminal pins 21a to 21d (tips). Parts 202a to 202d).

  Thus, since the notch parts 20a-20d have the opening part 201a-201d opened largely, the electric wire of the drive coils 10 and 11 can be easily hooked on the notch parts 20a-20d.

  Moreover, since the notches 20a to 20d have a tapered shape in which the tip portions 202a to 202d are formed, the wires of the drive coils 10 and 11 are temporarily hooked on the notches 20a to 20d. The terminals 10a, 10b, 11a, and 11b can be easily tied to the terminal pins 21a to 21d, and the winding terminals 10a, 10b, 11a, and 11b can be tightly tied with the terminal pins 21a to 21d. .

  Further, as shown in FIG. 3, a flexible wiring board (power feeding board) 50 on which a predetermined circuit is constructed is connected to the terminal pins 21a to 21d for driving control of the stepping motor 1 (FIG. 3). The flexible wiring board 50 is indicated by a dotted line in FIG. In the flexible wiring board 50, pin connection holes 51a to 51d are formed in a positional relationship corresponding to the respective terminal pins 21a to 21d, and the terminal pins 21a to 21d and the flexible wiring board are provided around the pin connection holes 51a to 51d. Lands L for electrically connecting 50 are formed. That is, the terminal pins 21a to 21d are inserted into the pin connection holes 51a to 51d and soldered, whereby the flexible wiring board 50 is connected to the terminal pins 21a to 21d. In the present embodiment, the pin connection holes 51a and 51c through which the first terminal pins 21a and 21c are inserted are referred to as first pin connection holes, and the pin connection through which the second terminal pins 21b and 21d are connected. The holes 51b and 51d are referred to as second pin connection holes.

  In this embodiment, since the terminal pins 21a-21d are provided along the axial direction (X-axis) of the rotating shaft 2, as described above, the terminal pins 21a-21d are centered on the X-axis. Since they are provided so as to alternately rise and fall in the X-axis direction (referred to as an upward direction and a downward direction in FIG. 2), the distance between the terminal pins 21a to 21d can be increased. . Therefore, the land L having a size necessary for soldering can be formed on the flexible wiring board 50. Furthermore, when winding terminal 10a, 10b, 11a, 11b is wound around terminal pin 21a-21d by an automatic coil apparatus, the malfunction that the nozzle cannot pass between terminal pins can also be prevented.

  Further, as shown in FIG. 3, the distance Da between the first terminal pin 21 a (and 21 c) and the output side end surface of the stator 5 is the distance between the first pin connection hole 51 a (and 51 c) and the flexible wiring board 50. It is designed to be larger than the distance da with the output side end face. The distance Db between the second terminal pin 21b (and 21d) and the counter output side end face of the stator 5 is the distance between the second pin connection hole 51b (and 51d) and the counter output side end face of the flexible wiring board 50. It is designed to be larger than db.

  By arranging the first terminal pins 21 a and 21 c and the second terminal pins 21 b and 21 d in such a positional relationship with respect to the stator 5, the flexible printed circuit board 50 is arranged in the axial direction of the rotating shaft 2 of the stator 5. There is no more protrusion. This prevents the flexible wiring board 50 from increasing the mounting space of the stepping motor 1 and leads to downsizing of the device to which the stepping motor 1 is attached. Note that the flexible wiring board 50 preferably does not protrude from the Y-axis direction in FIG. 3 (does not protrude from the top of the stator 5). In this case, the mounting space for the stepping motor 1 can be further reduced. .

  Further, since the terminal pins 21a to 21d are provided so as to alternately move up and down (referred to as an upward direction and a downward direction in FIG. 2) in the X-axis direction, the respective terminal pins 21a in the Y-axis direction. It is possible to reduce the width of ˜21d. Therefore, when the longitudinal direction of the flexible wiring board 50 is the X-axis direction in FIG. 3, the board may be arranged so that the board does not protrude from the Y-axis direction.

  Next, a stepping motor according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a sectional side view schematically showing the stepping motor, and FIG. 5 is a top view of the stepping motor (in a state where the flexible wiring board 50 is not connected). The same components as those in the embodiment shown in FIGS. 1 to 3 described above are denoted by the same reference numerals, and different points will be mainly described.

  As shown in FIG. 4, the stepping motor 1 a includes a rotor 4 including a rotating shaft 2 and a rotor magnet (permanent magnet) 3 fixed to the rotating shaft 2, as in the first embodiment. And a stator 5 disposed to face each other via a gap.

  On the outer peripheral side of the stator 5 having such a configuration, a terminal block 20 is provided with a plurality of terminal pins 21a to 21d with which the winding terminals 10a and 10b drawn from the drive coils 10 and 11 are entangled. Is provided.

  Similarly to the first embodiment, terminal pins 21 a to 21 d are provided on the terminal block 20 along the axial direction (X axis) of the rotary shaft 2. By arranging the terminal pins 21a to 21d in this way, it is possible to increase the interval between the terminal pins 21a to 21d.

  Similarly to the first embodiment, the terminal pins 21a to 21d are provided so as to alternately move up and down (referred to as an upward direction and a downward direction in FIG. 5) about the X axis in the X axis direction. The distance between the terminal pins 21a to 21d can be further increased.

  As members for supporting the terminal block 20, terminal block holding portions 30 and 31 for fixing the terminal block 20 are provided on the flange portions 12 b and 14 b of the inner stator cores 12 and 14 constituting the stator 5.

  In the present embodiment, the terminal block holding portion 30 formed on the flange portion 12b of the inner stator core 12 is bent and extended from the flange portion 12b in the axial direction of the rotary shaft 2 so that the bottom surface 20e of the terminal block 20 is formed. A first holding portion 12c to be supported and a second holding portion 12d that extends from the flange portion 12b in the direction intersecting the axial direction and fits into the fitting hole 20f of the terminal block 20 are formed.

  Similarly, the terminal block holding portion 31 of the inner stator core 14 is fitted with the first holding portion 14c which stands upright from the flange portion 14b and supports the bottom surface 20e of the terminal block 20, and the terminal block 20 which also stands upright from the flange portion 14b. A second holding portion 14d that fits into the hole 20f is formed.

  Each of the second holding portions 12d and 14d is formed at a substantially central position of the stator 5, and the first holding portions 12c and 14c are formed on the inner stator core 12 so as to correspond to the positions of the terminal pins 21a to 21d. The tip end of the first holding portion 12c in the axial direction is extended to the same position as the terminal pin 21b in the axial direction, and also in the circumferential direction of the stator 5 (up and down (Y axis) direction in FIG. 5). It is preferable to support the position outside the position of the terminal pin 21b. The first holding portion 14c formed on the inner stator core 14 is also extended to the same position as the terminal pin 21c in the axial direction in the opposite direction to the first holding portion 12c, and with respect to the circumferential direction of the stator 5 However, it is preferable to support the outer position from the position of the terminal pin 21c.

  As shown in FIG. 4, the inner stator core 12 and the inner stator core 14 are arranged so as to overlap in the axial direction so that the second holding portion 12d of the inner stator core 12 and the second holding portion 14d of the inner stator core 14 are just overlapped with each other. Yes. The terminal block 20 is fixed to the terminal block holding portions 30 and 31 by fitting the second holding portions 12d and 14d in the overlapped state into the fitting holes 20f of the terminal block 20. .

  The bottom surface 20 e of the terminal block 20 is supported by the first holding portion 12 c provided in the terminal block holding portion 30 of the inner stator core 12 and the first holding portion 14 c provided in the terminal block holding portion 31 of the inner stator core 14. Is done.

  As described above, the second holding portions 12d and 14d are fitted into the fitting holes 20f of the terminal block 20, and the terminal blocks 20 are formed by the first holding portions 12c and 14c formed upright from the flange portions 12b and 14b. Since the bottom surface 20e is supported, the terminal block 20 is prevented from inadvertently inclining in the axial direction and the vertical direction of the axis. As a result, it becomes easy to place the flexible wiring board on the terminal block 20 and connect the circuit pattern of the flexible wiring board 50 to the terminal pins 21a to 24d.

  Next, a stepping motor according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a cross-sectional side view schematically showing the stepping motor, and FIG. 7 is a top view thereof (a state where a flexible wiring board is not connected). In addition, about the same structure as 1st embodiment mentioned above, the same code | symbol is attached | subjected and it demonstrates centering on a different point.

  As shown in FIG. 6, the stepping motor 1 b includes a rotor 4 and a rotor magnet 3 each having a rotating shaft 2 and a rotor magnet (permanent magnet) 3 fixed to the rotating shaft 2, as in the first embodiment. And a stator 5 disposed to face each other via a gap.

  In the present embodiment, the drive coils 10 and 11 housed in the stator 5 (the first stator set 8 and the second stator set 9) are wound and housed around the first coil bobbin 101 and the second coil bobbin 102, respectively. ing.

  The coil bobbins 101 and 102 include cylinder portions 101a and 102a around which the drive coils 10 and 11 are wound, and flange portions 101b and 102b, respectively. The first terminal block 201 and the second terminal block 202 are integrally formed by bending and extending from the flange portions 101b and 102b in the axial direction of the rotary shaft 2.

  Here, the first terminal block 201 and the second terminal block 202 are bent in directions away from the coil bobbins 101 and 102, respectively. When the first terminal block 201 and the second terminal block 202 are formed so as to be adjacent to the coil bobbins 101 and 102, the first terminal block 201 and the second terminal block 202 cover the cylindrical portions 101a and 102a. This is because when the winding is wound around the coil bobbins 101 and 102, the first terminal block 201 and the second terminal block 202 become an obstacle.

  When the coil bobbins 101 and 102 formed in this way are arranged back to back, as shown in FIG. 7, the first terminal block 201 and the second terminal block 202 are engaged, and the terminal block 20 is formed. Similarly to the first and second embodiments, terminal pins 21 a to 21 d are provided on the terminal block 20 along the axial direction (X axis) of the rotary shaft 2. Thereby, it becomes possible to enlarge the space | interval of each terminal pin 21a-21d.

  Similarly to the second embodiment described above, the terminal pins 21a to 21d are alternately moved up and down (referred to as an upward direction and a downward direction in FIG. 7) in the X-axis direction around the X-axis. The distance between the terminal pins 21a to 21d can be further increased.

  According to the stepping motor 1 b having such a configuration, the terminal block 20 is connected to the first terminal block 201 formed on the first coil bobbin 101 and the second terminal block 202 formed on the second coil bobbin 102. Since it is divided and each is formed as a separate body, the assembly of the stepping motor is facilitated. Further, since the first terminal block 201 and the second terminal block 202 are formed integrally with the coil bobbins 101 and 102, respectively, it is not necessary to attach the terminal block 20 as a separate member, and the manufacturing cost of the stepping motor is reduced. It can be greatly reduced.

  Thus, according to the stepping motor 1 (1a, 1b) according to the present embodiment, the terminal pins 21a to 21d are arranged along the axial direction of the rotating shaft 2 of the stepping motor 1 (1a, 1b). A sufficiently large interval can be secured between the terminal pins. Thereby, the trouble that the nozzle of the automatic coil device for winding the winding terminals 10a, 11a of the drive coils 10, 11 around the terminal pins 21a-21d cannot pass between the terminal pins 21a-21d, and the terminal pins 21a- It is possible to prevent a problem that a space for forming a land L having a size necessary for solder application cannot be secured on the flexible wiring board 50 connected to 21d.

  In this case, the first terminal pin 21a (21c) and the second terminal pin 21b (21d) are arranged in the X-axis direction in a direction (Y-axis direction) orthogonal to the axial direction (X-axis direction) of the rotary shaft 2. It is provided so as to alternately move up and down (referred to as an upward direction and a downward direction in FIG. 2). Further, the terminal pins 21a to 21d are not arranged so as to overlap in the Y-axis direction. Therefore, it is possible to secure a larger distance between the first terminal pin 21a (21c) and the second terminal pin 21b (21d).

  The first terminal pins 21a and 21c are located on the output side of the second terminal pins 21b and 21d, and the first terminal pins 21a and 21c and the second terminal pins 21b and 21d include The flexible wiring board 50 in which the first pin connection holes 51a and 51c and the second pin connection holes 51b and 51d are formed is attached to the corresponding positions. The distance between the output side end face of the flexible wiring board 50 and the first pin connection holes 51 a and 51 c in the axial direction of the rotary shaft 2 is the distance between the first terminal pins 21 a and 21 c and the output side end face of the stator 5. Designed to be smaller. In addition, the distance between the non-output side end face of the flexible wiring board 50 and the second pin connection holes 51 b and 51 d is designed to be smaller than the distance between the second terminal pins 21 b and 21 d and the counter output side end face of the stator 5. Has been. With this configuration, the flexible wiring board 50 attached to the stepping motor 1 (1a, 1b) does not protrude from the stator 5, and the flexible wiring board requires the stepping motor 1 (1a, 1b). It is possible to prevent an increase in the mounting space, which leads to downsizing of the device to which the stepping motor 1 (1a, 1b) is mounted.

  Further, according to the stepping motor 1a shown in FIGS. 4 and 5, the inner stator cores 12 and 14 are formed with terminal block holding portions 30 and 31 for holding the terminal block 20, and the terminal block holding portions 30 and 31 are formed. Among these, the 1st holding | maintenance parts 12c and 14c are comprised so that it may extend in the axial direction of the rotating shaft 2 from the outer peripheral end part of the stator 5, and may support the bottom face 20e of the terminal block 20. Thereby, the inadvertent inclination of the terminal block 20 is prevented, and it becomes easy to perform the process of mounting and connecting the flexible wiring board 50 to the terminal block 20.

  Moreover, even if the stator 5 is the stepping motor 1 (1a, 1b) composed of the two-phase stators of the first stator set 8 and the second stator set 9 as in the present embodiment, the respective stator sets 8, 9 Since the first terminal pins 21a and 21c and the second terminal pins 21b and 21d arranged on the terminal block 20 are arranged along the axial direction of the rotating shaft 2, the distance between the terminal pins 21a to 21d is determined. A sufficient interval can be secured. In particular, as in the present embodiment, if the terminal pins 21a and 21d located outside the stator sets 8 and 9 are arranged so as to be outside the center position in the axial direction of the stator sets 8 and 9, respectively. A sufficient distance between the terminal pins 21a to 21d can be ensured.

  Further, in the present embodiment, the first terminal pin 21a and the second terminal pin 21b arranged in the first stator set 8, and the first terminal pin 21c and the second terminal pin arranged in the second stator set 9 are used. The terminal pins 21d are at different positions in the direction (Y-axis direction) orthogonal to the axial direction (X-axis direction) of the rotating shaft 2, specifically, substantially vertically spaced about the axial direction of the rotating shaft 2. It is arrange | positioned in the position spaced apart. By adopting such a configuration, in the stepping motor 1 (1a, 1b) having a two-phase stator, it is possible to ensure a larger distance between the terminal pins 21a to 21d.

  Further, according to the stepping motor 1b already described, the terminal block 20 is disposed on the first terminal block 201 disposed on the first stator set 8 (coil bobbin 101) and the second stator set 9 (coil bobbin 102). The second terminal block 202 and the first terminal block 201 and the second terminal block 202 are formed separately. With such a configuration, the stepping motor 1b can be easily assembled, and the manufacturing cost can be greatly reduced.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in various aspects. For example, although the above-described stepping motors 1, 1a, and 1b all have a two-phase structure, the present invention can be applied to a single-phase structure or a structure having three or more phases.

1 is a cross-sectional side view of a stepping motor according to a first embodiment of the present invention. FIG. 2 is a top view of the stepping motor according to the first embodiment shown in FIG. 1 (a state where a flexible wiring board is not connected). FIG. 2 is a top view of the stepping motor according to the first embodiment shown in FIG. 1 (a state where a flexible wiring board is connected). It is a section side view of the stepping motor concerning a second embodiment of the present invention. FIG. 6 is a top view of the stepping motor according to the second embodiment shown in FIG. 4 (a state where a flexible wiring board is not connected). It is a cross-sectional side view of the stepping motor which concerns on 3rd embodiment of this invention. FIG. 7 is a top view of the stepping motor according to the second embodiment shown in FIG. 6 (a state where a flexible wiring board is not connected). FIG. 8A is a top view for explaining the arrangement of terminal pins in a conventional stepping motor, and FIG. 8B is a top view showing a state in which a flexible wiring board is connected to the stepping motor. is there.

Explanation of symbols

1, 1a, 1b Stepping motor 2 Rotating shaft 4 Rotor 5 Stator 8 First stator set 9 Second stator set 10, 11 Drive coil (air-core coil)
10a, 10b, 11a, 11b Winding terminals 12, 14 Inner stator cores 13, 15 Outer stator cores 12a-15a Polar teeth 20 Terminal block 201 First terminal block 202 Second terminal blocks 20a-20d Notched portions 21a-21d Terminals Pins 30 and 31 Terminal block holding portion 50 Flexible wiring boards 51a to 51d Pin connection holes

Claims (12)

A rotor having a rotating shaft and a permanent magnet provided on the outer periphery of the rotating shaft, a stator having a stator core with pole teeth standing upright, a drive coil disposed on the outer periphery of the pole teeth, and an outer peripheral side of the stator In a stepping motor comprising a terminal block arranged and a plurality of terminal pins arranged on the terminal block,
The plurality of terminal pins include a first terminal pin with which one winding terminal of the coil is entangled and a second terminal pin with which the other winding terminal of the coil is entangled, and the first terminal The stepping motor according to claim 1, wherein the pin and the second terminal pin are arranged on the terminal block along an axial direction of the rotating shaft.   2. The stepping motor according to claim 1, wherein the first terminal pin and the second terminal pin are arranged at different positions in a direction orthogonal to the axial direction of the rotating shaft.   The first terminal pin and the second terminal pin are arranged at different positions so as to sandwich the axis of the rotary shaft in a direction perpendicular to the axial direction of the rotary shaft. Item 5. A stepping motor according to Item 2.   The terminal block has a first cutout portion corresponding to the first terminal pin and a second cutout portion corresponding to the second terminal pin formed at a peripheral portion thereof. Each of the notch and the second notch is formed at a position adjacent to the corresponding terminal pin in a direction orthogonal to the axial direction of the rotating shaft of the terminal block, and one winding terminal of the coil is Pulled out from the first notch and entangled with the first terminal pin, and the other winding terminal of the coil is pulled out from the second notch and entangled with the second terminal pin. The stepping motor according to claim 1, wherein the stepping motor is provided.   5. The stepping motor according to claim 4, wherein the first cutout portion and the second cutout portion are tapered from the peripheral portion of the terminal block toward the terminal pin side.   The first terminal pin and the second terminal pin are arranged at different positions so as to sandwich the axis of the rotating shaft in the direction orthogonal to the axial direction of the rotating shaft, and provided on the terminal block The first notch and the second notch are notched in opposite directions in the circumferential direction of the stator at positions corresponding to the first terminal pin and the second terminal pin, One winding terminal of the coil and the other winding terminal of the coil are drawn out in the opposite direction with respect to the circumferential direction of the stator and entangled with the first terminal pin and the second terminal pin. The stepping motor according to claim 4, wherein the stepping motor is provided.   The first terminal pin is positioned on the output side of the second terminal pin, and the first terminal pin and the second terminal pin have a first pin connection hole and a second pin at positions corresponding to the first terminal pin and the second terminal pin, respectively. A power supply board in which two pin connection holes are formed is attached, and the distance between the output side end face of the power supply board and the first pin connection hole in the axial direction of the rotation shaft and the opposite output side of the power supply board The distance between the end face and the second pin connection hole is smaller than the distance between the output side end face of the stator and the first terminal pin and the distance between the counter output side end face of the stator and the second terminal pin, respectively. The stepping motor according to any one of claims 1 to 6, wherein:   The stator core is formed with a terminal block holding portion for holding the terminal block. The terminal block holding portion extends from the outer peripheral end of the stator in the axial direction of the rotating shaft and contacts the bottom surface of the terminal block. The stepping motor according to any one of claims 1 to 7, wherein an inclination of the base in the axial direction is prevented.   The stator includes two stator sets, the first terminal pins and the second terminal pins arranged in one stator set, and the first terminal pins and the second arranged in the other stator set. 9. The stepping motor according to claim 1, wherein the terminal pins are arranged on the terminal block along an axial direction of the rotation shaft.   The first terminal pin and the second terminal pin arranged in the one stator set, and the first terminal pin and the second terminal pin arranged in the other stator set are arranged on the rotating shaft. The stepping motor according to claim 9, wherein the stepping motors are arranged at different positions in a direction orthogonal to the axial direction.   The first terminal pin and the second terminal pin of each of the two sets of stators are arranged at different positions so as to sandwich the axis of the rotary shaft in the direction orthogonal to the axial direction of the rotary shaft. The stepping motor according to claim 10, wherein the stepping motor is provided.   The terminal block is formed of a first terminal block disposed in the one stator set and a second terminal block disposed in the other stator set, and the first terminal block and the second terminal block. The stepping motor according to claim 9, wherein the terminal block is formed separately.

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