JPH0644529B2 - Coil set - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coil set in which two coil bobbins wound with two wires are superposed, and is applied to a motor and other electromagnetic devices. is there.

(Prior Art) In a motor and other electromagnetic devices, a coil set formed by winding a coil around a coil bobbin is used. Among electromagnetic devices, permanent magnet type (PM type) stepping motors have
Two wires are formed as if they were one, that is, two wires are piled up at the same time and wound on a coil bobbin to form two coils, and then the winding start and winding end are taken out separately and each coil is controlled separately. There is a winding type called bifilar winding. FIG. 9 shows an example of the above-mentioned bifilar winding, in which the coil bobbin 30 has two coils formed by alternately winding the first wire 31 and the second wire 32. The two coils are labeled C in FIG.
As shown by a and Cb, they are connected in series, terminals are output from both ends, and terminals are also output from both connection points. In the case of a PM type stepping motor having a four-phase configuration, two coil sets formed as described above are used in a superposed manner.

(Problems to be Solved by the Invention) According to the conventional coil set in which two coil bobbins wound with two wires are superposed, it is necessary to independently wind each coil bobbin. In order to obtain one coil set consisting of one coil bobbin, two winding processes are required, and the winding work is troublesome. Further, the conventional method of winding two wires around one coil bobbin is bifilar winding, and the terminal treatment is complicated. In particular, the ends of the four wires for the two coil bobbins are eight, which is extremely troublesome because it requires a process such as winding and soldering each of these around the terminals one by one. Problems such as poor continuity were likely to occur. Furthermore, since two wires are used at the same time, it is difficult to automate the winding.

The present invention has been made in order to solve the above-mentioned conventional problems, and one coil bobbin has two wires per wire.
By forming a single coil and forming a total of four coils for one set of two coil bobbins in one continuous process, manufacturing is easy and inexpensive, and terminal treatment is also possible. It is an object of the present invention to provide a coil set that is easy to operate and is less likely to cause problems such as disconnection and poor continuity, and that facilitates automation of windings such as NC windings.

(Means for Solving the Problems) In the present invention, two coil bobbins each having three terminals are arranged and overlapped so that each of the three terminals is aligned, and the coil bobbin is centered. In the cross section including the axis, the coil is wound on the inner and outer layers in the same area, and the coil of the first layer among the coils wound on the two layers is two of the three terminals. The coil of the second layer is connected to the two terminals including the remaining one of the three terminals.

(Operation) Two coils are formed on one coil bobbin, and a total of four coils are formed on the two coil bobbins that are overlapped. Since the two coils in one coil bobbin are formed in two layers on the inner peripheral side and the outer peripheral side, they can be formed with one wire by the following procedure. First 1
The first wire is wound after connecting one wire to one of the three terminals and then corresponds to the end of the coil of the first layer of the wire and the start of the coil of the second layer. After connecting the portion to the other one terminal, the coil of the second layer is wound, and the portion corresponding to the end of the coil of the second layer of the wire is connected to the remaining one terminal. Then, in the same manner, use one wire for the other coil bobbin in the first layer and the second layer.
Layered coils can be formed. At this time, one wire wound around one coil bobbin can be continuously wound around the other coil bobbin, and the wire portion extending from one coil bobbin side to the other coil bobbin side may be cut later.

(Example) Hereinafter, an example of a coil assembly according to the present invention will be described with reference to the drawings.

First, regarding the example of the coil bobbin used in the present invention,
A description will be given with reference to FIGS. Coil bobbin 10
Is a cylindrical part 12 for winding a coil and collar parts 11, 11 at both ends thereof.
And a terminal mounting portion 13 in which three terminals 14 are embedded is integrally formed on the outer side of the one collar portion 11. The terminal mounting portion 13 is formed in a rectangular parallelepiped shape, and one side surface of the terminal mounting portion 13 is integrally formed so as to be offset along a radial line passing through the center of the arc of the bobbin 10. The above-mentioned three terminals 14 have a constant distance X therebetween. Also, from the side surface of the terminal mounting portion 13 located on the above radial line, the terminal 14 closest to this side surface
When the interval up to is x, the relationship is x = (1/2) X. The thickness Y of the terminal mounting portion 13 is substantially the same as the thickness of two cores described later. Two such coil bobbins 10 are used, and two coil bobbins 10 are superposed in an abdominal shape with two cores sandwiched therebetween. In the flange portion 11 on both sides of the coil bobbin 10 on which the terminal mounting portion 13 is integrally formed, a pin 16 used for overlapping the two coil bobbins 10 and the other coil bobbin 10 are provided.
Is formed with a hole 20 into which the pin 16 is fitted, and a protrusion 15 that determines the relative positional relationship between the coil bobbin 10 and the core is formed.
An abutting portion 29 is formed on the side opposite to 13 with the same protrusion amount as the thickness Y of the terminal mounting portion 13. This contact portion 29 is brought into contact with the collar portion of the other bobbin to be overlapped,
This is to secure the space required for interposing the two cores between the two bobbins. On the outer surface of the other flange portion 11 of the bobbin 10, a pin 17 for positioning with respect to the case or the like of the motor to which the coil set is attached is provided in a protruding manner.

4 to 6 show an embodiment of a coil set according to the present invention using the coil bobbin 10 described above. 4 to 6, one coil set is two coil bobbins of the same form.
The coils 10 and 10 are laid on top of each other, and two cores 18 are sandwiched between the two coil bobbins 10 and 10 for superposition. The positioning of the core 18 with respect to the bobbin 10 is performed by fitting the pin 15 of the bobbin 10 into the hole of the core 18. Also, two bobbins 1
Pins 16 of one bobbin 10 are holes 20 of the other bobbin 10
, And the pins 16 are integrally joined by being melted and solidified by means such as ultrasonic welding.
By polymerizing the two bobbins 10, 10 in abdominal shape,
Both terminal mounting portions 13 and 13 are arranged on the left and right with a radial line passing through the center of the arc of the bobbins 10 and 10 as a boundary, and a total of six terminals 14 are arranged in a straight line. . For each of the above six terminals 14, as shown in FIG.
The symbol DEF is attached. A plurality of pole teeth 19 are formed by bending on the two cores 18.
The pole teeth 19 of are arranged along the inner peripheral surface of the cylindrical portion 12 of the bobbin 10. Each coil bobbin 10,10 has two coils 21 and 22 wound inward and outward in the same cross-sectional area.

The following method can be used as a method of winding coils in two layers on each of the two coil bobbins 10, 10.

A wire is wound around the terminal indicated by A in FIG.

The above wire is wound around the cylindrical portion 12 of one coil bobbin 10 as many times as necessary to form the coil 21 of the first layer.

Wind the wire around terminal B.

The above wire is further wound around the coil 21 of the first layer a necessary number of times to form the coil 22 of the second layer.

Wind the wire around terminal C.

The same wire as the above wire is further wound around the terminal D of the other coil bobbin 10.

The wire is wound around the other coil bobbin 10 a required number of times to form the first layer coil in the other coil bobbin 10.
Form 21.

Wind the wire around terminal E.

The coil 21 of the first layer in the other coil bobbin 10
Then, the above wire is further wound a necessary number of times to form the coil 22 of the second layer.

The wire and the terminal F are wound around and cut.

The wire between the terminals C and D is cut.

The coil is wound in two layers on each of the coil bobbins 10 and 10 through the above procedure. And one coil bobbin
Both ends of the coil 21 of the first layer of the two-layer coil of 10 are connected to two terminals A and B of the three terminals of one coil bobbin 10, and both ends of the coil 22 of the second layer are connected. Is connected to two terminals C and B including the remaining one of the three terminals of the coil bobbin 10, and both ends of the coil 21 of the first layer in the other coil bobbin 10 are connected to the other coil bobbin 10 2 of the three terminals in the coil bobbin 10 are connected to two terminals D and E of the three terminals, and both ends of the coil 22 of the second layer are the two terminals F including the remaining one of the three terminals of the coil bobbin 10. , E will be connected. Therefore, the two coils in each coil bobbin 10,10 are connected in series as shown in FIG. 8, both ends of which are connected to terminals, and the connection points of the two coils are also connected to terminals. It has become. Since there are two sets of coils having such a configuration, they can be used, for example, as a set of four-phase PM type stepping motor coils.

According to the embodiment of the present invention described above, instead of winding the coils on the two coil bobbins as independent steps,
Two coils per bobbin and one coil bobbin can be continuously wound with one wire, so the winding process can be simplified and the winding can be automated easily. Therefore, it is possible to provide an inexpensive coil set that is easy to manufacture. Also, 3 for each coil bobbin
A total of six terminals are arranged in a straight line, and the coil of the first layer in each coil bobbin is two of the three terminals, and the coil of the second layer is the remaining one of the three terminals. The first layer and the second layer are connected because they are connected to two books including books.
A terminal treatment step for connecting the ends of each coil to the terminals can be provided as an intermediate step of forming the coil of the layer, which simplifies the terminal treatment and eliminates problems such as disconnection and poor continuity to create a high quality coil set. Can be provided.

In the above-mentioned embodiment, as a coupling means of the two coil bobbins, the core is interposed, and the pins of one bobbin and the holes of the other bobbin are fitted and ultrasonically welded. According to this joining means, it is possible to easily form the two bobbins at a low cost without the need for an insert die having a complicated shape required for the method of inserting the core to form the coil bobbin. However, the use of ultrasonic welding as described above to form the two bobbins is not essential to the present invention, and the insert molding or other appropriate means may be used if necessary.

Next, one application example of the coil set according to the present invention will be described with reference to FIG. FIG. 7 shows an example in which the coil set according to the present invention is applied to a PM type stepping motor having a four-layer structure. In FIG. 7, reference numeral 10 is a coil bobbin,
14 is a terminal, 18 is a core, 21 is a first layer coil, and 22 is a second layer coil. The coil bobbins 10 are overlapped in a two-layered manner as in the above-described embodiment, and the coil bobbins 10 and 10 have a first layer coil 21 and a second layer coil 22, respectively. The above-mentioned pole teeth formed by bending each of the two cores 18 are arranged at regular intervals along the inner peripheral surface of each bobbin 10, 10. Between the pole teeth of each core 18, pole teeth formed by bending are inserted in the other cores 24, 24 arranged outside the coil bobbins 10, 10. The pole teeth of one core 18 and the pole teeth of the other core 24 are alternately arranged in a zigzag pattern at predetermined intervals. The coil set is positioned and mounted in a predetermined posture by fitting the above-mentioned positioning protrusion 17 formed on the bobbin 10 into the positioning hole of the motor case.

In the cylindrical space surrounded by the pole teeth of each of the cores 18 and 24, a rotor having a rotor magnet 27 integrated with a rotating shaft 26 is rotatably supported. Rotor magnet
27 has N poles and S poles alternately at relatively small intervals in the circumferential direction, and each of the coil bobbins 10 and 10 has a total of 4 poles each.
By controlling energization of each coil through the six terminals 14, the rotor is rotationally driven according to a known operation principle. Rotational force of the rotor is transmitted to the output shaft 28 via an appropriate transmission mechanism.
Be transmitted to.

As described above, if the coil set according to the present invention is used as the coil set of the stepping motor, the stepping motor can be configured extremely easily.

In addition, a collar is provided in the center of one bobbin in the axial direction to make a winding space on both sides in the axial direction of the bobbin, and a winding is made in each winding space to make one coil set. A coil in which four coils are superposed in the axial direction by superposing in the axial direction is known. That described in JP-A-59-63972 is that. Comparing the magnetomotive force (ampere turn) between the conventional example described in this publication and the present invention under the same conditions such as the inner and outer diameters of the coil bobbin and the cross-sectional area around which each coil is wound. Then, the magnetomotive force of the coil wound on the inner layer in the present invention is the strongest. (However, inside and outside 2
Since the cross-sectional areas of the two layers are the same, there is no extreme difference in torque balance. ) Therefore, when the coil set according to the present invention and the above conventional coil set are incorporated into a stepping motor and various characteristics are compared, the stepping motor incorporating the coil set according to the present invention has a pull-out torque of the inner coil, That is, the load applied to the rotor of the motor is sequentially increased, the torque when the rotor is finally stopped is large, and the maximum continuous response frequency characteristic, that is, the responsiveness of the rotor to the drive pulse becomes excellent. As described above, although the rotation torque is increased by the excitation of the inner coil and the rotation torque is reduced by the outer coil of the present invention, the rotor is rotated by the inertia caused by the excitation and rotation of the coil when driving the stepping motor. The inertial force is influenced by the one with the larger rotation torque, and the rotation torque becomes larger.

Therefore, when the coil set according to the present invention is applied to a stepping motor, the total pull-out torque characteristic and the maximum continuous response frequency characteristic become better than the conventional coil bobbin when the inertial force due to the excitation and rotation of each coil is totaled. .

(Effects of the Invention) According to the present invention, instead of winding coils on two coil bobbins as an independent process, two coils per bobbin by one wire, and two coil bobbins Since it can be wound continuously, the winding process can be simplified, the winding can be easily automated, and an inexpensive and easy coil set can be provided. In addition, three terminals for each coil bobbin, six terminals in total, are arranged in a straight line, and the coil of the first layer in each coil bobbin is two of the above three terminals, and the coil of the second layer is the above three terminals. Since two terminals including the remaining one of the terminals are connected, a terminal treatment step of connecting each coil end portion to the terminal may be performed as an intermediate step of forming the coils of the first layer and the second layer. This makes it possible to provide a high-quality coil set by simplifying the terminal treatment and eliminating problems such as disconnection and poor continuity.

As an example of a conventionally known coil set, winding spaces are formed on both sides in the axial direction of one bobbin, and a winding is applied to each winding space to form one coil set. There is one in which four coils are polymerized in the axial direction by polymerizing in the direction. Comparing the magnetomotive force between the conventional example and the present invention under the same conditions, the magnetomotive force of the coil wound around the inner layer in the present invention is the strongest. (However, since the inner and outer layers have the same cross-sectional area, this is not an extreme difference in torque balance.)
Therefore, when the coil set according to the present invention and the above conventional coil set are incorporated in a stepping motor and various characteristics are compared, the coil set according to the present invention has a larger pullout torque and is excellent in the maximum continuous response frequency characteristic. ing. As described above, although the rotation torque is increased by the excitation of the inner coil and the rotation torque is reduced by the outer coil of the present invention, the rotor is rotated by the inertia caused by the excitation and rotation of the coil when driving the stepping motor. The inertial force is influenced by the one with the larger rotation torque, and the rotation torque becomes larger.

Therefore, when the coil set according to the present invention is applied to a stepping motor, the total pull-out torque characteristic and the maximum continuous response frequency characteristic become better than the conventional coil bobbin when the inertial force due to the excitation and rotation of each coil is totaled. .

[Brief description of drawings]

FIG. 1 is a front view showing an example of a coil bobbin that can be used in the present invention, FIG. 2 is a plan view of the same as above, FIG. 3 is a partially sectional side view of the same, and FIG. FIG. 5 is a front view showing an embodiment of such a coil set, FIG. 5 is a plan view of the same as above, FIG. 6 is a partial sectional side view of the same, and FIG. 7 is a longitudinal section showing an example of a stepping motor to which the coil set according to the present invention is applied. Fig. 8 is a circuit diagram showing an example of connection of a coil set, and Fig. 9 is a partial cross-sectional side view schematically showing an example of a conventional coil set. 10 …… Coil bobbin, 14 …… Terminal, 21 …… First layer coil, 22 …… Second layer coil.

Claims (1)

[Claims] 1. In a coil set in which two coil bobbins each having three terminals are superposed, and a coil is wound around each of these two coil bobbins, the two coil bobbins have three terminals each. In a cross section including the central axis of the coil set, which are arranged in a straight line and superposed,
The coil is wound on the inner layer and the outer layer in the same area,
Of the coils wound in the two layers, the coil in the first layer includes two of the three terminals, and the coil in the second layer includes the remaining one of the three terminals. A coil set characterized by being connected to a book.