JPH0419957Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a flat multipolar coil suitable for small motors and actuators, which has a plurality of pole patterns made of metal conductors on both sides of an insulating substrate. [Prior Art] In recent years, there has been a demand for small and thin coils for small motors. In order to meet this requirement, flat multipolar coils such as printed coils are formed by etching, plating, or a combination of these processes, so-called printed wiring technology. An example of this flat multipolar coil is shown in FIG.
Figure 3 shows the surface of a flat multipolar coil.
A plurality of pole patterns 12 are formed on a circular insulating substrate 11 at equiangular intervals with respect to the center of the circle. Although not shown in the figure, pole patterns are formed on the back side of the insulating substrate 11 with the insulating substrate 11 in between so as to face each other and the pole patterns 12 are located at the center of each pole. It is electrically connected via the through hole 13. Further, all the coils formed with the insulating substrate 11 in between are connected in series between terminals 14 and 15, and are connected to the outside via these terminals 14 and 15. The pole pattern 12 and the pole pattern facing it with the insulating substrate 11 in between are the terminals 14
The coil is arranged in such a way that when a current is passed between The winding method has been selected. Two notches 16 for positioning the magnetic detection element are provided in a part of the outer periphery of the insulating substrate 11. Further, a terminal portion 17 protrudes from a part of the outer periphery of the insulating substrate 11, and terminals 14 and 15 are installed on the terminal portion 17. In such a flat multipolar coil having a conductor portion for positioning or holding the magnetic detection element, the conductor portion for positioning the magnetic detection element is formed by a solid conductor 18. [Problems to be solved by the invention] When the conventional flat multi-pole coil as described above is assembled into a motor and used, for example, the magnetic field that crosses the coil is generated by a magnet installed at a position facing the coil. However, as the coil or magnet moves, eddy currents are generated in the solid conductor portion, increasing the no-load current of the motor, and as a result, reducing the motor's function.
I had this problem. [Means and effects for solving the problem] The present invention solves the above problem by changing the dummy conductor portion from a solid shape to a stripe shape. The striped dummy conductor of the present invention is particularly applied to a dummy conductor portion within a range where the magnetic field intersects perpendicularly to the plane of the flat multipolar coil. In the present invention, the range in which the magnetic field intersects perpendicularly to the surface of the flat multipolar coil means that when the flat multipolar coil is assembled and used in a motor or actuator, the magnetic field generated by the magnet used in the motor or actuator is This refers to the area that intersects perpendicularly to the coil surface, and when the magnet or coil moves, it also includes the coil part that newly intersects perpendicularly to the magnetic field. Strictly speaking, when there is an air space between the coil and the opposing magnet, the area where the magnetic field does not intersect perpendicularly to the coil increases due to this air space, but here we will ignore the effect of this air space. shall be. The larger the area of the dummy conductor, the more likely eddy currents that cause functional deterioration of the motor or actuator are generated.
Therefore, from this point of view, it is most preferable to have no dummy conductor part at all, but on the other hand, the dummy conductor part needs to have a certain area or more in order to prevent uneven plating or etching of the surrounding coil conductor parts. . As a result of repeated studies in view of the above, the present invention was developed by making the dummy conductor part striped when assembling and using a flat multi-pole coil in a motor or actuator. It was determined that there was no decline. An example of the present invention is shown in FIG. Fig. 1 shows a flat multipolar coil in which the dummy conductor part for positioning the magnetic detection element is replaced with a striped dummy conductor 19 instead of the conventional solid conductor 18 shown in Fig. 3. be. In FIGS. 2A and 2B, three substrates each having a polar pattern 12 formed on an insulating substrate 11 are arranged with one end of the sheets overlapping each other so that each polar pattern is oriented in the same direction. A indicates the front surface and B indicates the side surface. The polar pattern 12 on each substrate has a rectangular spiral shape, and although it is not shown in the figure, the insulating substrate 1
A polar pattern is also formed on the back surface of the electrode 1 so as to face the polar pattern 12, and these polar patterns facing each other are electrically connected to each other via a through hole 13 at the upper center of the polar pattern. Second
When the flat multipolar coil shown in the figure is assembled into a motor or actuator and used, a magnet is placed opposite the flat multipolar coil, and a current is passed through the flat multipolar coil. At this time, the holding part 20 of the flat multipolar coil is a striped dummy conductor 19.
Otherwise, the generation of eddy currents cannot be suppressed. 1 and 2, it goes without saying that the striped dummy conductor of the present invention is also applied to the dummy conductor on the back surface of the insulating substrate 11. The term "stripe" as used in the present invention refers to two or more filaments, whether straight or curved, arranged at regular intervals in the same direction without intersecting each other. In FIGS. 1 and 2, conductor lines 21 connecting striped dummy conductors 19 arranged in the same direction without intersecting each other are necessary for manufacturing the striped dummy conductors by electroplating or the like. Even if it remains, as long as it does not create a loop with the striped dummy conductor, the effects of the present invention will not be impaired in any way. The direction in which the striped dummy conductor of the present invention is arranged is parallel to the direction in which the magnetic field generated by the magnet changes, taking into account the influence of eddy currents generated by adjacent stripes and the unevenness of eddy current generation. However, it is preferable because it suppresses the generation of eddy current. Furthermore, in order to sufficiently suppress the generation of eddy currents, the width of the striped dummy conductor of the present invention is preferably at most five times the width of the coil conductor, more preferably at most the width of the coil conductor. Furthermore, in order to prevent uneven plating or etching, the ratio of the conductor occupation rate Rs of the striped dummy conductor to the conductor occupation rate Rc of the coil conductor, Rs/Rc, is preferably 0.5 times or more, and the closer to 1.0, the more preferable it is. . Here, the conductor occupancy refers to the ratio of the conductor width to the pitch between the conductors. Note that the flat multipolar coil of the present invention, which is preferably provided with striped dummy lines, is not limited to the one shown in FIG. 1 or FIG.
In the figure, the substrates may be arranged on the same plane without overlapping each other at all. [Comparative Example] A plasticless motor with the following specifications was manufactured using a planar multipolar coil prepared by forming a pattern using an electrolytic plating method as an armature. As the multipolar coil, a striped dummy conductor in a manner similar to that shown in FIG. 1 was used on the outer periphery, and the conductor occupation ratio was changed. Table 1 shows the results of measuring loss torque by rotating a motor manufactured using each multipolar coil. As is clear from Table 1, when the conductor occupation ratio of the striped dummy conductor of the multipolar coil is 1 or less, a motor with low loss torque cannot be obtained, and the effect of reducing eddy current generation by the striped dummy conductor is recognized. On the other hand, in the range of less than 0.3 and more than 1, uneven plating of the coil conductor portion and poor formation of the striped dummy conductor wire occur, making it impossible to obtain a flat multipolar coil with excellent performance. The aforementioned loss torque reduction effect is equivalent to extending the life of AA batteries per motor by nearly 20%. Flat multipolar coil specifications Coil outer diameter 30mm Coil inner diameter 10mm Conductor wire width 0.17mm Conductor wire cross-sectional area 0.007mm Number of poles of ² coils 9 Number of coil turns 15/pole Motor specifications Magnet outer diameter 18mm Number of magnetized magnets 6 poles Gap magnetic flux density 5350 Gauss Coil/Magnet Empty 0.3mm Rotation speed 2500rpm

[Table] Frequent
2. Many products are made of solid dummy approximations [Effects] The flat multipolar coil of the present invention has a striped conductor for the dummy conductor part, so when it is assembled and used in a motor or actuator, there is almost no eddy current generation, and the motor and actuator function deterioration can be suppressed.

[Brief explanation of drawings]

Figure 1 is a surface view of a circular flat multipolar coil in which the striped dummy conductor of the present invention is applied to the conductor part for positioning a magnetic detection element, and Figure 2A.
and B are surface and side views of a flat multipolar coil in which the striped dummy conductor of the present invention is applied to a conductor portion for holding a magnetic detection element, and FIG. 3 is a conductor portion for positioning a magnetic detection element. is a surface view of a circular flat multipolar coil which is a conventional solid conductor. 11... Insulating substrate, 12... Pole pattern, 13
...Through hole, 14, 15...Terminal, 16...
... Notch for positioning the magnetic detection element, 17 ... Terminal section, 18 ... Solid dummy conductor, 19 ... Striped dummy conductor, 20 ... Holding section, 21 ...
stripe connecting line.

Claims (1)

[Scope of utility model registration request] In the flat multipolar coil in which a plurality of pole patterns made of metal conductors are provided on both sides of an insulating substrate, the above-mentioned flat multipolar coil in which the plurality of pole pattern surfaces and the magnetic field intersect perpendicularly and where no pole pattern is provided. A plurality of striped dummy conductors are placed on the board surface parallel to the direction in which the magnetic field generated by the magnet changes without intersecting each other, and the conductor occupancy rate (Rs) of the striped dummy conductors and the occupancy of the coil conductor are Rate (Rc)
A flat multipolar coil provided with dummy conductor patterns arranged at a ratio (Rs/Rc) of 0.5 or more and 1 or less.