JP2007068364A - Coil apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil apparatus in which a lead cover is not required and extraction resistance of a conductor for outer connection can be improved. <P>SOLUTION: The coil apparatus integrally has clamping parts W1, W2, V1 and V2 clamping a terminal substrate 50. Lead lines are inserted from a notch G on a side of the terminal substrate 50 and are bent on a rear side. A terminal side T of the lead lines is inserted into a conductor terminal hole H and is solder-connected to conductive patterns R (R'). A prescribed segment of a coil of an A phase is connected to terminal pins P1, P2 and P3 projected from the pin holes (h) and is soldered to the conductive patterns R (R'). A prescribed segment of a coil of a B phase is connected to terminal pins Q1, Q2 and Q3 projected from the pin holes (h) and is soldered to the conductive patterns R (R'). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coil device in a stepping motor or the like, and more particularly to improvement of a terminal block and a terminal board.

  Conventionally, there is a small stepping motor as disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-73409. As shown in FIGS. 5 and 6, a PM type (permanent magnet) in which a shaft 2 is press-fitted into a permanent magnet 1 or fixed with an adhesive. Shape) The inner rotor 3, the A phase coil bobbin 4a around which the winding wire (not shown) is wound, the B phase coil bobbin 4b around which the winding wire (not shown) is wound, and the pole claws (pole teeth) K are staggered. In this way, the inner part of the B-phase coil bobbin 4b so that the A-phase inner yoke 5a and the A-phase outer yoke 6a inserted from the opposite direction along the inner peripheral surface of the A-phase coil bobbin 4a and the pole claws (pole teeth) K are staggered. A B-phase inner yoke 5b and a B-phase outer yoke 6b inserted from opposite directions along the peripheral surface, a concave case 7 having a first bearing metal 7a, and a second bearing metal 8a. And a plate 8.

  A notch S is formed in the concave case 7. Insertion protrusions (not shown) are respectively formed at one of the flange portions of the A-phase inner yoke 5a and the B-phase inner yoke 5b, and the two insertion protrusions overlap with each other via the notch S. It protrudes slightly from the surface. A resin terminal board (not shown) is fitted in these insertion protrusions. The terminal pins (not shown) implanted in the terminal board are tangled with solder wires (not shown) drawn from the A-phase coil bobbin 4a and the B-phase coil bobbin 4b and soldered. A lead cover 9 that covers a terminal substrate (not shown) protrudes from the notch S. As shown in FIG. 7, the lead cover 9 has overhanging pieces 9 a and 9 a integrally on both sides, which are hooked on the inner peripheral surface near the notch S of the concave case 7.

Then, one end of the lead wire L is soldered to a terminal pin (not shown) of a terminal board (not shown), bent slightly, and drawn out through the lead wire insertion hole 9b. This is because the lead wire L is brought into contact with the hole edge of the lead wire insertion hole 9b, so that the tensile force of the lead wire L is relaxed and peeling from a terminal pin (not shown) on one terminal side is suppressed. Because.
JP-A-2005-73409

  Although the lead cover 9 serves to improve the pulling resistance of the lead wire L for external connection, the terminal board and the terminal pin, the contact portion between the protruding piece 9a of the lead cover 9 and the concave case 7 when the motor is started. In addition, vibration is generated at the contact portion between the lead cover 9 and the terminal board, and there is a problem that abnormal noise is generated.

  Therefore, in view of the above problems, an object of the present invention is to provide a coil device that does not require a lead cover and can improve the resistance to pulling out a lead wire for external connection.

  In order to solve the above-described problems, a coil device according to the present invention includes a first terminal block on which at least two first terminal pins are erected and a first latching portion located at both ends of the arrangement of one hook portion. The first coil bobbin integrally provided on the outer peripheral edge side, the second terminal block on which at least two terminal pins are erected, and the second latching portions located at both ends of the arrangement are integrally provided on the outer peripheral edge side of one of the flanges. A conductive pattern formed in a region including a pin hole and a conductor terminal hole, and the conductor wire is inserted from the side surface side and bent on the back surface side, and the terminal side is fitted into the conductor terminal hole to conduct the conductive A terminal board connected to the pattern, and the first coil bobbin and the second coil bobbin are overlapped with the first terminal block and the second terminal block aligned in the axial direction, and the terminal board has first and second terminal pins On each corresponding The terminal board is pushed between the first and second latching portions so as to be fitted into the pin holes, and both side edges of the terminal board are latched by the first and second latching portions, and wound around the first coil bobbin. Each of the predetermined first line segments is entangled with the corresponding first terminal pin and connected to the conductive pattern, and the second predetermined line segment wound around the second coil bobbin is associated with the corresponding first line segment. It is characterized in that it is connected to the conductive pattern by being entangled with two terminal pins.

  In such a configuration, since the coil device integrally includes a latching portion for latching the terminal board, the lead cover is not necessary, and the problem of abnormal noise generation can be solved and the number of parts can be reduced. Cost reduction can be realized. In addition, since the terminal board is latched by the latching portion of the terminal block of the coil bobbin, it is possible to improve the pull-out resistance of the conducting wire and the terminal board. Furthermore, since the terminal pin that ties the predetermined line segment of the wire is away from the conductive pattern that connects the terminal of the conductive wire, the terminal pin can be prevented from coming off.

  Note that the terminal pin can be a heat-resistant resin that is integrally formed with the terminal block, as long as a predetermined part of the wire is tangled, and the tangled part is connected to the conductive pattern by soldering, etc., reducing the number of parts Can be achieved.

  In the case of four terminal pins, the coil device can be used in a bipolar two-phase stepping motor, but a unipolar two-phase stepping motor requires six terminal pins. Therefore, the first terminal block has a first terminal pin for common planting between the two first terminal pins, and the second terminal block is for common planting between the two second terminal pins. It is desirable to have a second terminal pin. In the case of such six terminal pins, the conductive pattern including the pin hole into which the first common terminal pin is inserted and the conductive pattern including the pin hole into which the second common terminal pin is inserted into one common conductive pattern. It is desirable that

  According to the present invention, a lead cover is not required, the problem of abnormal noise generation can be solved, and cost reduction can be realized by reducing the number of parts. In addition, it is possible to improve the lead-out resistance of the lead wire for external connection.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 is a perspective view showing a stepping motor according to an embodiment of the present invention, FIG. 2 is a plan view of the stepping motor, FIG. 3 is a perspective view showing a coil device built in the stepping motor, and FIG. It is a disassembled perspective view which shows one of a coil bobbin and a yoke.

  As shown in FIGS. 1 and 2, the stepping motor of this example includes a concave case 7 having a notch S, a cover plate 8 having a bearing metal 8a, and latching portions W1, W2, and V1 protruding from the notch S. , V2 and the terminal board 50 that covers the notch S and whose side edges are latched by the latching portions W1, W2, V1, and V2. Reference numeral 40 denotes a spur gear that transmits the power of the motor to the outside.

  A coil device 20 shown in FIG. 3 is accommodated in the concave case 7. The coil device 20 has a stacked structure in which an A-phase coil device 21 and a B-phase coil device 22 are connected. As shown in FIG. 4, the A-phase coil device 21 includes a resin-made A-phase coil bobbin 14 a around which a winding wire (not shown) is wound and an A-phase coil bobbin 14 a so that pole claws (pole teeth) K are staggered. An A-phase inner yoke 15a and an A-phase outer yoke (not shown) are inserted along the inner peripheral surface from the opposite direction. Further, as shown in FIG. 4, the B-phase coil device 22 has a resin-made B-phase coil bobbin 14b around which a winding wire (not shown) is wound and a B-phase coil bobbin 14b so that pole claws (pole teeth) K are staggered. A B-phase inner yoke 15b and a B-phase outer yoke 16b inserted from the opposite direction along the inner peripheral surface.

  The A-phase coil bobbin 14a and the B-phase coil bobbin 14b are of the same type, and a terminal block M (N) is integrally formed on the outer peripheral side of the flange portion 17a (17b), and a terminal pin is formed on the terminal block M (N). P1 to P3 (Q1 to Q3) are planted. Locking portions W1, W2 (V1, V2) having hooks are integrally formed at both ends of the terminal block M (N). In the state where the A-phase coil device 21 and the B-phase coil device 22 are stacked, the terminal block M of the A-phase coil bobbin 14a and the terminal block N of the B-phase coil bobbin 14b are aligned in the axial direction, and the terminal pins P1 to P1 of the A-phase coil bobbin 14a are aligned. P3 and terminal pins Q1 to Q3 of the B-phase coil bobbin 14b are parallel to the axial direction, and the locking portions W1 and W2 of the A-phase coil bobbin 14a and the locking portions V1 and V2 of the B-phase coil bobbin 14b are also aligned in the axial direction. Arrangement.

  A plurality of conductive patterns R are formed in a region including the pin hole h and the conductor terminal hole H on the front side of the terminal substrate 50. A region including a pin hole h into which the central terminal pin P2 is inserted and a pin hole h into which the terminal pin Q2 is inserted is a common conductive pattern R ′. Then, each lead wire (not shown) is inserted through the notch G on the side surface side of the terminal substrate 50 and bent on the back surface side thereof, and the terminal side T of the lead wire is fitted into the conductor terminal hole H so as to be conductive pattern R. (R ') is connected by soldering.

  Since this example is a unipolar type two-phase stepping motor, six terminal pins P1 to P3 (Q1 to Q3) are required, but both ends of the winding (not shown) of the A phase coil bobbin 14a are respectively The first terminal pins P1 and P3 protruding from the pin hole h are tangled to the respective conductive patterns R, and the central line segment is tangled to the first common terminal pin P2 protruding from the pin hole h. Soldered to the common conductive pattern R ′. Also, both ends of the winding (not shown) of the B-phase coil bobbin 14b are tangled with the second terminal pins Q1 and Q3 protruding from the respective pin holes h and soldered to the respective conductive patterns R. The second common terminal pin Q2 protruding from the pin hole h is tangled to the common conductive pattern R ′ and soldered.

  As described above, since the coil bobbins 14a and 14b are integrally provided with the latching portions W1, W2, V1, and V2 for latching the terminal substrate 50, the lead cover becomes unnecessary and the problem of abnormal noise generation can be solved. . In addition, a lead wire (not shown) is inserted through the notch G on the side surface side of the terminal substrate 50 and bent on the back surface side, and the terminal side T of the lead wire is fitted into the conductor terminal hole H so that the conductive pattern R (R ′ ), Even if a tensile force is applied to the lead wire (not shown), the terminal board 50 is pulled, but the terminal board 50 is latched by the latching portions W1, W2, V1, and V2. Therefore, the lead-out resistance of the lead wire (not shown) and the terminal board 50 can be improved. Furthermore, since the terminal pins P1 to P3 (Q1 to Q3) that tie the wire (not shown) are separated from the portion connecting the terminal side T of the lead wire, the terminal pins P1 to P3 (Q1 to Q3) Can be prevented from coming off.

  The terminal pins P1 to P3 (Q1 to Q3) are connected to a predetermined line segment (not shown), and the tangled portion and the conductive pattern R (R ') are connected by soldering or the like. P1 to P3 (Q1 to Q3) may be a heat-resistant resin integrally formed with the terminal block M (N), and the number of parts can be reduced.

1 is a perspective view showing a stepping motor according to an embodiment of the present invention. It is a top view of the stepping motor. It is a perspective view which shows the coil apparatus incorporated in the stepping motor. It is a disassembled perspective view which shows one of the coil bobbin and the yoke in the same coil apparatus. It is a disassembled perspective view which shows the conventional stepping motor. It is a perspective view which shows the stepping motor. It is a perspective view which shows the lead cover incidental to the stepping motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Permanent magnet 2 ... Shaft 3 ... PM type (permanent magnet type) inner rotor 4a, 14a ... A phase coil bobbin 4b, 14b ... B phase coil bobbin 5a, 15a ... A phase inner yoke 5b, 15b ... B phase inner yoke 6a ... A phase outer yoke 6b, 16b ... B phase outer yoke 7 ... concave case 8 ... cover plate 7a, 8a ... bearing metal 9 ... lead cover 9a ... projecting piece 9b ... lead wire insertion holes 17a, 17b ... flange 20 ... coil Device 21 ... A phase coil device 22 ... B phase coil device 40 ... Spur gear 50 ... Terminal substrate K ... Pole claw (pole tooth)
M, N: Terminal blocks P1-P3, Q1-Q3 ... Terminal pins G, S ... Notches h ... Pin holes H ... Conductor terminal holes R ... Conductive patterns R '... Common conductive patterns T ... Terminal sides W1, W2, V1, V2 ... Hook

Claims (4)

A first terminal bobbin in which at least two first terminal pins are erected, and a first coil bobbin integrally having a first latching portion located at both ends of the arrangement on the outer peripheral side of one of the flanges, and at least two Including a second terminal block on which the terminal pin stands and a second coil bobbin integrally having a second latching portion located at both ends of the array on the outer peripheral side of one flange portion, a pin hole and a conductor terminal hole A conductive pattern formed in the region has a terminal board that is inserted from the side surface side and bent on the back surface side, the terminal side of which is connected to the conductive pattern by fitting into the conductive terminal hole, and the first coil bobbin and the first The two coil bobbins are overlapped with the first terminal block and the second terminal block aligned in the axial direction, and the first and second hooks are arranged so that the first and second terminal pins are inserted into the corresponding pin holes, respectively. Push between stops Then, both side edges of the terminal board are latched by the first and second latching portions, and a predetermined line segment of the first winding wire wound around the first coil bobbin is bound to the corresponding first terminal pin. The second conductive wire is connected to the conductive pattern by connecting a predetermined line segment of the second winding wire wound around the second coil bobbin to the corresponding second terminal pin. Coil device. 2. The first terminal block according to claim 1, wherein the first terminal block includes a first terminal pin for common planting between the two first terminal pins, and the second terminal block includes two second terminal pins. A coil device having a second terminal pin for common planted therebetween. 3. The common conductive pattern according to claim 2, wherein the conductive pattern including the pin hole into which the first common terminal pin is inserted and the conductive pattern including the pin hole into which the second terminal pin for common is inserted. The coil apparatus characterized by becoming. A stepping motor comprising the coil device as defined in any one of claims 1 to 3.