JPH0448130Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a DC control motor equipped with a control circuit component having an electronic circuit for distributing current to a stator drive coil.

[Prior Art] The above-mentioned conventional DC control motor has a structure as shown in, for example, Japanese Utility Model Application No. 59-18570 and FIG. 4. In the same figure, 1 is the rotation axis;
2 is a rotor magnet, 3 is a stator, 4 is a bearing, 5 is a bearing holder, and 15 is a substrate 17 on which an electronic circuit is formed with an insulating paper 16 in between, and a shield plate 18 made of an iron plate or the like, which are overlapped and caulked together. An electronic circuit formed on the substrate 17 of the control circuit component 15 distributes current to the drive coil that generates the maximum torque, and the drive magnetic flux generated thereby drives the rotor. 10 rotates together with the rotating shaft 1.

[Problems to be solved by the invention] In the conventional DC control motor described above, insulation between the substrate 17 and the shield plate 18 in the control circuit component 15 is achieved by sandwiching the insulating paper 16. There have been cases where the insulating paper 16 has been misaligned or forgotten to be inserted, resulting in poor insulation between the substrate 17 and the shield plate 18.

This invention was made in order to solve such conventional problems, and it is possible to obtain a DC control motor that has good insulation between the board and the shield plate in the control circuit component, and is virtually free from insulation defects. purpose.

[Means for Solving the Problems] The DC control motor according to this invention has a substrate that constitutes an electronic circuit that distributes current to the drive coil of the stator, and a circuit board that is superimposed on the patterned surface of this substrate and connected by caulking. a control circuit component consisting of a shield plate as an electrically conductive and strong structural member, and an insulating coating is formed on the shield plate of the control circuit component, except for the end surface portion, on the side mating with the substrate. However, on the patterned surface of the substrate, silk printing is applied to the portions corresponding to the shield plate where the insulating coating is not formed, and the warped portions of the shield plate due to manufacturing by die cutting etc. are made to overlap with the substrate. It is located on the opposite side of the mating surface.

[Function] In this invention, the entire area of the mating surface between the shield plate and the substrate can be insulated by the insulating coating of the shield plate and the silk-screen printing on the patterned surface of the substrate without the intervention of insulating paper, and Insulation is further improved because there are no curved parts on the surface mating with the substrate that are produced by mold cutting or the like of the shield plate.

[Embodiment] FIGS. 1, 2, and 3 show a DC control motor as an embodiment of the present invention, but as can be seen from the drawings, the control circuit component 6 is excluded. The other configurations are the same as the conventional example described above. Therefore, the same parts as in the conventional example are designated by the same reference numerals in the drawings, and the description thereof will be omitted. The DC control motor of this example is characterized by a substrate 7 constituting an electronic circuit 7A that distributes current to the driving coils of the stator 3, and a conductive substrate 7 that is overlaid and caulked to the patterned surface of this substrate 7. The control circuit component 6 is provided with a shield plate 8 as a certain strength structural member, and the shield plate 8 in the control circuit component 6 has an insulating coating 9 on the side that is mated to the substrate 7 except for the end surface. is formed, and on the patterned surface of the substrate 7, silk printing 11 is applied to the portion corresponding to the shield plate 8 where the insulating coating 9 is not formed, and the shield plate 8 is manufactured by die cutting, etc. This is because the accompanying return portion 12 is located on the opposite surface to the surface mating with the substrate 7. The substrate 7 and the shield plate 8 are caulked and integrated with an eyelet 13, and are fixed to the stator 3 with screws 14. Note that the insulating coating 9 is formed by subjecting the mating surface side of the shield plate 8 made of an iron plate to surface treatment.

Thus, in the DC control motor of this example, the control circuit component 6 configuring the electronic circuit 7A that distributes current to the drive coil is connected to the substrate 7 configuring the electronic circuit 7A. an insulating coating 9 formed on the shield plate 8;
The silk printing 11 applied to the patterned surface of the substrate 7 insulates the entire area of the mating surface between the shield plate 8 and the substrate 7 without intervening insulating paper, and also eliminates the damage caused by manufacturing by die-cutting the shield plate 8. Since the turned part 12 is directed to the opposite side of the mating surface so that the part 12 does not damage the silk printing 11 of the substrate 7,
The insulation between the substrate 7 and the shield plate 8 in the control circuit component 6 is good, no insulation failure occurs, and manufacturing is easy.

[Effects of the invention] As is clear from the above description of the embodiments, the DC control motor of the invention has a substrate that constitutes an electronic circuit that distributes current to the stator drive coil, and a pattern of this substrate. A control circuit component is provided with a shield plate as a conductive strength structural member overlaid on a surface and caulked together, and the shield plate in the control circuit component has an end surface portion on the surface mating with the substrate. An insulating film is formed on the patterned surface of the board, and silk printing is applied to the part corresponding to the shield plate where the insulating film is not formed. Since the bent part is located on the opposite side of the mating surface with the board, the entire area of the mating surface between the shield board and the board is covered with the insulating paper by the insulating coating of the shield plate and the silk printing on the patterned surface of the board. The shield plate can be placed in an insulating state without any intervention, and the insulation portion is not damaged because there are no warped parts on the surface mating with the substrate due to mold cutting of the shield plate or the like.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of a DC control motor as an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an enlarged sectional view showing the structure of the control circuit components, and FIG. FIG. 4 is a sectional view showing a conventional example. In the figure, 1 is a rotating shaft, 3 is a stator, 6 is a control circuit component, 7 is a substrate, 7A is an electronic circuit, 8 is a shield plate, 9 is an insulating coating, 11 is silk printing, and 12 is a return portion. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A control circuit configuration consisting of a substrate that constitutes an electronic circuit that distributes current to the stator drive coil, and a shield plate that is a conductive strength structural member that is overlapped and caulked to the patterned surface of this substrate. The shield plate of the control circuit component has an insulating coating formed on the side of the shield plate mating with the substrate except for the end face portion, and the patterned surface of the substrate has a portion where the insulating coating is not formed. A direct current control motor characterized in that a portion corresponding to the shield plate is silk-printed, and a bent portion of the shield plate produced by die-cutting or the like is located on the opposite surface of the mating surface with the substrate.