JPH0419982Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electric motor in which a coil is formed by laminating insulating sheets having conductor layers in a predetermined pattern.

[Technical background of the invention and its problems]

An example of this type of motor is an axial gap type brushless motor. This thing is
The armature coil is formed by laminating substrates having conductor layers in a predetermined pattern on a stator base, and a rotor is rotatably provided axially opposite the armature coil. Accordingly, the energization to each armature coil is switched and rotated. However, such a brushless motor has a problem in that it is likely to generate electromagnetic noise due to switching because the power supply to the armature coil is switched as described above.

Therefore, in order to prevent the generation of electromagnetic noise, it is possible to install a capacitor in parallel with the armature coil, but in this case, the capacitor lead wires are soldered to both ends of the armature coil. As a result, parts management and assembly work become more troublesome and manufacturing costs increase.

[Purpose of invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide an electric motor that can eliminate the need for an external capacitor and can be manufactured at low cost.

[Summary of the idea]

In this invention, a conductor layer for electrodes is provided on an insulating sheet on which a conductor layer for a coil is formed, and a capacitor is constructed by the conductor layers for electrodes facing each other via an insulating sheet or a dielectric sheet interposed between the insulating sheets. The capacitor is connected in series or in parallel with the coil.

[Example of idea]

A first embodiment in which the present invention is applied to an axial gap type brushless motor will be described below with reference to FIGS. 1 to 4. FIG. 1 shows an insulating sheet 1 laminated on a stator base (not shown). This insulating sheet 1 has an annular shape with a circular hole 1a in the center, and is simultaneously formed by, for example, printed wiring means or plating method. It has a conductor layer 2 for forming an armature coil and a conductor layer 3 for electrodes (in FIG. 1, the conductor layers 2 and 3 are shown with diagonal lines for clarity). The conductor layer 2 for forming the armature coil is composed of, for example, six coil conductor layers 2a to 2f, which together form a substantially spiral pattern, and are arranged at equal angular widths around the circular hole 1a. Layer 3 is insulation sheet 1
It is provided in an annular shape around the outer peripheral edge of each coil conductor layer 2a to 2f. The insulating sheet 1 on which the conductors 2 and 3 are formed in this manner is provided on the stator base in a four-layer stacked state as shown in FIG. In this laminated state, three capacitors 4 are formed between the electrode conductor layers 3 and 3 of each insulating sheet 1, using the insulating sheet 1 as a dielectric and facing each other with the insulating sheet interposed therebetween. That is, in FIG. 3, if each insulating sheet 1 is the insulating sheet of the first layer to the fourth layer from the top, the first layer is formed between the electrode conductor layers 3 and 3 of the first and second layer insulating sheets. A capacitor 4 using the insulating sheet of the second layer as a dielectric is formed, and a capacitor 4 using the insulating sheet of the second layer as a dielectric is formed between the electrode conductor layers 3 and 3 of the insulating sheet of the second and third layers. A capacitor 4 is formed between the electrode conductor layers 3 and 3 of the third and fourth layer insulating sheets, using the third layer insulating sheet as a dielectric.

A pair of coil conductor layers facing each other in the radial direction in one insulating sheet 1 are connected in series, and each coil conductor layer at the same position on each insulating sheet 1 is also connected in series to form the armature of each phase. A coil 5 is constructed, and the armature coils 5 of each phase are star-connected as shown in FIG. Further, the three capacitors 4 configured as described above are connected to a star-connected armature coil 5.
Each set of armature coils 5,
5 are connected in parallel. That is, FIG. 2 shows the connection relationship between the coil conductor layer and the capacitor 4. In the figure, the two-dot chain line A is a conductive wire for serially connecting the coil conductor layers located at the same position on each insulating sheet 1, and the broken line is B is a conductor wire for connecting in series a pair of coil conductor layers facing each other in the radial direction in the fourth layer insulating sheet 1, and solid line C is a conductor wire for starting the armature coil 5 of each phase in the first layer insulating sheet 1. A conductive wire for connection, a solid line D, is a conductive wire that connects the armature coil 5 of each phase and each electrode conductor layer 3 constituting the capacitor 4. In addition, conductor A
D to D may be formed on the back surface of the insulating sheet 1 by printed wiring means or plating method and connected to the coil conductor layer through through holes, or may be insulated from the coil conductor layer and the electrode conductor layer 3 on the surface of the insulating sheet 1. It can be constructed by known means, such as by printed wiring means or plating method, or by lead wires.

Further, although not shown, the stator base is provided with a bearing sleeve located within the circular hole 1a of the insulating sheet 1, and a field magnet provided on the rotor is installed in this bearing sleeve to create a gap in the axial direction of the armature coil 5. It is located in the same location.

In the above configuration, energization to the armature coil 5 of each phase is switched depending on the rotational position of the rotor detected by a rotational position detection element (not shown). However, since a capacitor 4 configured between the electrode conductor layers 3 and 3 is connected in parallel to the armature coil 5 as a two-phase set, the generation of surge voltage due to switching of the armature coil 5 can be suppressed. Therefore, the generation of electromagnetic noise can be prevented. Since the capacitor 4 is naturally formed by laminating the insulating sheets 1, there is no need to connect the capacitor as a separate component by soldering, etc., which simplifies component management and assembly work, and reduces manufacturing costs. can be reduced,
It can also contribute to the automation of assembly. Moreover, lead wires etc. can be omitted or shortened compared to the case where an external capacitor is attached to the armature coil.
Since the capacitor 4 can be provided closer to the armature coil 4, which is a source of electromagnetic noise, it is extremely effective in suppressing electronic noise.

In this embodiment, the dielectric of the capacitor 4 is made up of only the insulating sheet 1;
A dielectric sheet may be provided between them, and the insulating sheet 1 and the dielectric sheet may be used as the dielectric layer of the capacitor 4. In order to change the capacitance of the capacitor 4, if only the insulating sheet 1 is used as the dielectric of the capacitor 4 as in this embodiment, the material of the insulating sheet 1 should be selected to have an appropriate dielectric constant. If a separate dielectric sheet is provided, the capacitance of the capacitor 4 can be changed by the dielectric sheet.

Next, a second embodiment in which the present invention is applied to a capacitor run type induction motor will be described with reference to FIGS. 5 to 11. First, in FIG. 5 showing the overall configuration, 6 is a stator base that also serves as a yoke, and a bearing tube 7 is erected in the center of this stator base.
A first insulating sheet 8 and a second insulating sheet 9 are laminated on the stator base 6. A conductor layer 11 for forming an auxiliary coil 10 is formed on the first insulating sheet 8, and as shown in FIG. The coil conductor layer 11a has a substantially spiral pattern. Further, on the outer periphery of the first insulating sheet 8, a first electrode conductor layer 12 (shown with diagonal lines in FIG. 7) surrounds the conductor layer 11 for configuring the auxiliary coil 10. It is formed. On the other hand, a conductor layer 14 for forming the main coil 13 is formed on the second insulating sheet 9 . As shown in FIG. 8, this conductor layer 14 also consists of four coil conductor layers 14a arranged at equal angular intervals in the circumferential direction and forming a substantially spiral pattern, each coil conductor layer 14a having a first Therefore, the auxiliary coil 10 of the first insulating sheet 8 and the main coil 13 of the second insulating sheet 9 are shifted by 90 degrees in electrical angle. It is arranged as follows. 15 is the second insulating sheet 9
This is the second electrode conductor layer (shown with diagonal lines in FIG. 8) formed on the outer periphery of the main coil 1.
The first electrode conductor layer 1 of the first insulating sheet 8 is provided so as to surround the conductor layer 14 for three configurations.
It is facing 2. Therefore, in the laminated state of both sheets 8 and 9, as shown in FIG.
A capacitor 16 is constructed which faces each other with the insulating sheet 9 as a dielectric. This capacitor 16 is connected in series to the auxiliary coil 10 and connected to the AC power supply 17 together with the main coil 13 as shown in FIG. Acts as.

That is, FIG. 9 shows the coil conductor layer and capacitor 16.
In the figure, the two-dot chain line E indicates the connection relationship between each coil conductor layer 11 of the first insulating sheet 8.
A is a conducting wire for connecting the coil conductor layers 14a of the second insulating sheet 9 in series to form the auxiliary coil 10, a broken line F is a conducting wire for forming the main coil 13 by connecting the coil conductor layers 14a of the second insulating sheet 9 in series, and a solid line G is the auxiliary wire. The solid line H is a conducting wire that connects one end of the coil 10 to one end of the AC power source 17, and the solid line H is a conducting wire that connects the other end of the auxiliary coil 10 to one electrode conductor layer 12 of the capacitor 16.
is a conductive wire for connecting one end of the main coil 13 to one end of the AC power source 17, and a broken line K and a solid line L are connecting the other end of the main coil 13 and the other electrode conductor layer 15 of the capacitor 16 to the other end of the AC power source 17. This is a conductor for connection.

18 is a rotor, which includes a boss portion 18a into which a rotating shaft 19 is press-fitted, a plurality of secondary conductor portions 18b extending in the radial direction from this boss portion 18a, and an outer peripheral end of each secondary conductor portion 18b. It consists of a connecting annular end ring 18c. Rotating shaft 1 of rotor 18
9 is rotatably supported by the bearing cylinder 7 of the stator base 6, and the secondary conductor portion 18b is the second insulating sheet 9.
are opposed to each other in the axial direction with a gap in between.

According to the above configuration, since the phase splitting capacitor, which is generally externally attached, can be integrated into the stator side, the entire motor including the phase splitting capacitor can be downsized, and the work of assembling the phase splitting capacitor can be reduced. This can be made unnecessary and assembly costs can be reduced.

12 and 13 show a modification in which the present invention is applied to a capacitor run type induction motor, and the difference from the second embodiment is that the first insulating sheet 8 and the second insulating sheet The point is that three sets of 9 are stacked one on top of the other. In this way, the capacitance of the capacitor 16 can be made sufficiently large.

In each of the embodiments and modifications described above, the present invention is applied to a so-called axial gap type electric motor, but the present invention is not limited thereto, and can of course be applied to a radial gap type electric motor.

[Effect of idea]

As described above, the present invention provides a conductor layer for electrodes on an insulating sheet on which a conductor layer for coils is formed,
A capacitor is formed by the electrode conductor layers facing each other via the insulating sheet or the dielectric sheet sandwiched between the insulating sheets, and this capacitor is connected in series or parallel with the coil. This has the effect that an external capacitor can be made unnecessary and manufacturing costs can be reduced.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a plan view of an insulating sheet, and FIG. 2 is a diagram for explaining the connection relationship between a coil conductor layer and an electrode conductor layer. , FIG. 3 is a partially enlarged sectional view taken along the - line in FIG. 1 to show the laminated state of the insulating sheets, FIG. 4 is an electric circuit diagram, and FIG.
11 shows a second embodiment of the present invention, FIG. 5 is an overall vertical sectional view, FIG. 6 is a partially enlarged sectional view showing the laminated state of insulating sheets, and FIGS. 7 and 8 are FIG. 9 is a plan view of the first and second insulating sheets, respectively.
The figure is a diagram for explaining the connection relationship between the coil conductor layer and the electrode conductor layer, FIG. 10 is a perspective view of the rotor,
FIG. 11 is an electric circuit diagram, and FIGS. 12 and 13 are views corresponding to FIGS. 5 and 6 showing modifications of the second embodiment. In the drawing, 1 is an insulating sheet, 2 is a conductor layer for coil formation, 3 is a conductor layer for electrodes, 4 is a capacitor, and 5
is an armature coil (coil), 8 and 9 are first and second insulating sheets, 10 is an auxiliary coil, 1
1 and 14 are conductor layers for forming a coil, 12 and 1
5 is a conductor layer for the first and second electrodes, 13 is a main coil, and 16 is a capacitor.

Claims (1)

[Scope of utility model registration request] A coil is formed by laminating insulating sheets having conductor layers in a predetermined pattern, and the insulating sheet is provided with an electrode conductor layer, and the insulating sheet or a dielectric sheet interposed between the insulating sheets is An electric motor characterized in that a capacitor is formed by electrode conductor layers facing each other, and the capacitor is connected in series or parallel to the coil.