JPH03143253A - Rotor - Google Patents

Abstract

PURPOSE:To fix a printed board firmly by putting a printed board, where a conductor face is made out the outside, upon the end face of iron core, and winding the iron core and the printed board in a coil. CONSTITUTION:An iron core 2 is fixed to a shaft 1, and the through hole 18 of a printed board 3 is press-fit on the shaft so as to put the printed board 3 upon the end faces 8 and 12 of the iron core 2, and a commutator 4 is fixed at the specified position of the shaft 1. And a coil 5 is wound on the salient pole 7 of the iron core 2 and the projecting piece 9 of the printed board 3, and a capacitor 6 is inserted in the space between the coils 5, and the lead wires 16 and 17 of the capacitor 6 are soldered to the conductor face 10 of the printed board 3 and a terminal 11. The printed board 3, where the conductor face 10 is made, is put upon the end faces 8 and 12 of the iron core 2, and the iron core 2 and the printed board 3 are wounded in a coil 5, whereby the printed board 3 is fixed firmly. Hereby, the fixing work becomes simple and also insulation breakdown of the iron core can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor having a commutator and a capacitor for noise prevention.

[Conventional technology]

Conventional examples are shown in FIGS. 4 to 6. That is, this rotor has a shaft 50, an iron core 52 that is fixed to the shaft 50 and has a plurality of salient pole portions 51 protruding in the radial direction, and a core 52 that is fixed to the shaft 50 and corresponds to the salient pole portions 51. It has a commutator 54 provided with a terminal 53, a coil 55 connected to the terminal 53 and wound around the salient pole part 51,
2, and a noise prevention capacitor 57 connected between the shorting ring 56 and the terminal 53 and housed between the coils 55 of the salient pole portion 51. It is something.

The capacitor 57 is assembled by following the recess 58 and cut-and-raised piece 59 of the shorting ring 56, and then fixing one lead wire 60 of the capacitor 57 to the shorting ring 56 by welding or soldering. After inserting the capacitor 57 of the block between the coils 55 wound around the iron core 52, connect the other lead wire 61 of the capacitor 57 to the commutator 54.
It is soldered to each terminal 53 of.

Further, the fixation of the shorting ring 56 to the iron core 52 is maintained by press-fitting the cut and raised pieces 59 of the shorting ring 56 into the inner surface of the slot group 62 of the iron core 52.

Further, as another means of fixing the shorting ring 56, the shorting ring 56 can be bonded to one side of the iron core 52, or the capacitor 57 can be fixed.
For example, the coil 55 is bonded to the coil 55.

[Problem to be solved by the invention]

However, this rotor has the disadvantage that when the cut and raised pieces 59 are press-fitted, the insulating film of the iron core 52 is torn and insulation is no longer maintained. In addition, the fixing of the shorting ring 56 is unstable and the shorting ring 56 tends to float, which is not good in terms of balance.

On the other hand, if the shorting ring 56 or the capacitor 57 is fixed with adhesive, the adhesive may bulge out and hit the stator, causing malfunctions in rotor rotation, or the adhesive may adhere to the commutator 54, causing electrical connections between the brushes. is affected.

Furthermore, it takes a long time to dry the adhesive, resulting in poor workability and causing secondary accidents. Furthermore, the amount of adhesive also impairs the rotational balance of the rotor.

Therefore, an object of the present invention is to provide a rotor that can securely fix a capacitor without using an adhesive, prevent breakdown of the insulation of the iron core, and reduce unbalance of rotation. .

[Means to solve the problem]

The rotor of the present invention has a shaft, an iron core fixed to the shaft and having a plurality of salient pole portions protruding in the radial direction, and a central portion overlapped with an end surface in the axial direction of the iron core, and a central portion thereof. a printed circuit board having a shape consisting of a protruding piece extending radially from and overlapping with the end face of the salient pole part and having a conductive surface formed on the outer surface, and provided with a terminal fixed to the shaft and corresponding to the salient pole part. a commutator connected to the terminal and wound around the salient pole portion and the protruding piece, the conductive surface of the tip portion of the protruding piece exposed from the coil and the terminal; A noise prevention capacitor is connected between the coils of the salient pole portion and housed between the coils of the salient pole portion.

[Effect]

According to the configuration of the present invention, a current is supplied to the coil through the commutator, and a magnetic field appears at the salient pole portion of the iron core, so that a rotational force is generated between the coil and the stator, and the rotor becomes rotatable.

The commutator also slides over the brushes and the spark voltage when the current is switched is absorbed by the capacitor.

In this case, a printed circuit board with a conductive surface formed on the outer surface was placed on the end surface of the iron core, and the printed circuit board was also wrapped with a coil, so
Since the printed circuit board can be firmly fixed, there is no need to attach and fix the shorting ring as in the conventional example, which simplifies fixing and prevents the insulation of the iron core from being destroyed. Further, since it has a substantially star-like shape consisting of a central portion and a protruding piece, rotational unbalance is reduced. Furthermore, since no adhesive is required compared to the conventional example, a rotor with high precision can be provided without any negative effects such as the fear of secondary disasters caused by using an adhesive.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3. That is, this rotor has a shaft 1, an iron core 2,
It has a printed circuit board 3, a commutator 4, a coil 5, and a capacitor 6 for noise prevention.

The shaft 1 is an ordinary round bar.

The iron core 2 is fixed to the shaft 1 and has a plurality of salient pole portions 7 protruding in the radial direction. This iron core 2 is an example of a laminated iron core.

The printed circuit board 3 has a shape consisting of a central portion 13 that overlaps the end surface 8 of the iron core 2 in the axial direction, and protruding pieces 9 that extend radially from the central portion 13 and overlap the end surface 12 of the salient pole portion 7. A conductive surface 10 is formed. In the embodiment, the outer shape of the printed circuit board 3 is made the same as the end surface 8 of the iron core 2. The conductive surface 10 is made of copper foil. In addition, in order to maintain the insulation between the conductor surface 10 and the coil 5 more reliably, the insulating film 1
4 is coated on the surface of the conductor surface 10. (8 is the central part 1
This is a through hole of the shaft 1 formed in 3, and is made slightly smaller than the outer diameter of the shaft 1 so that it can be press-fitted and fixed.

The commutator 4 has a terminal 1 fixed to the shaft 1 and corresponding to the salient pole part 7.
1 is provided. 15 is a segment integrated with the terminal 11;
I9 is a base that holds the terminals 11 and segments 15.

The coil 5 is connected to the terminal 11 and wound around the salient pole portion 7 and the protruding piece 9.

The capacitor 6 is connected between the conductor surface 10 of the tip of the protruding piece 9 exposed from the coil 5 and the terminal 11 to form the salient pole part 7.
It is stored between the coils 5 of .

16 and 17 are lead wires. The outer shape of the capacitor 6 is substantially fixed in the space between the coils 5 by the slot 2a between the coil 5 and the salient pole portion 7 of the iron core 2.

To assemble this rotor, the iron core 2 is fixed to the shaft 1, the through hole 18 of the printed circuit board 3 is press-fitted into the shaft 1, and the end surface 8 of the iron core 2 is press-fitted into the shaft 1.
The printed circuit board 3 is stacked on the coil 12, the commutator 4 is fixed at a predetermined position on the axis l, the coil 5 is wound around the salient pole part 7 of the iron core 2 and the protruding piece 9 of the printed circuit board 3, and the capacitor 6 is mounted on the coil 5. Insert the lead wire 16.1 of the capacitor 6 into the space between
7 is soldered to the conductor surface 10 and terminal 11 of the printed circuit board 3.

In this rotor, current is supplied to the coil 5 through the commutator 4 from a brush (not shown) in contact with the commutator 4, and the iron core 2
Since a magnetic field appears in the salient pole part 7 of the stator (not shown)
A rotational force is generated between the two and the rotor becomes rotatable. The commutator 4 also slides on brushes (not shown) and the spark voltage when the current is switched is absorbed by the capacitor 6.

According to this embodiment, the printed circuit board 3 having the conductor surface 10 formed on the outer surface is overlapped with the end surfaces 8 and 12 of the iron core 2, and the printed circuit board 3 is also wrapped with the coil 5, so that the printed circuit board 3 can be firmly fixed. This eliminates the need for mounting and fixing the short-circuit ring as in the conventional example, which simplifies fixing, and prevents the insulation of the iron core 2 from being destroyed. Further, since it has a substantially star-like shape consisting of the central portion 13 and the protruding piece 9, rotational imbalance is reduced. Furthermore, since no adhesive is required compared to the conventional example, there are no adverse effects such as the fear of secondary disasters caused by using an adhesive (a highly accurate rotor can be provided).

〔Effect of the invention〕

According to the rotor of this invention, a printed circuit board with a conductor surface formed on the outer surface is stacked on the end face of the iron core, and the printed circuit board is also wrapped with a coil, so that the printed circuit board can be firmly fixed, unlike the conventional example. When installing the short-circuit ring, there is no need to fix it, which simplifies fixing and does not destroy the insulation of the iron core. Further, since it has a substantially star-like shape consisting of a central portion and a protruding piece, rotational unbalance is reduced. Furthermore, since no adhesive is required compared to the conventional example, there is an effect that a highly accurate rotor can be provided without any adverse effects such as the fear of secondary disasters caused by using an adhesive.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a front view seen from the axial direction, and Fig. 4 is an exploded perspective view of a conventional example with the shorting ring removed. FIG. 5 is a front view seen from the axial direction, and FIG. 6 is a sectional view. 1... Shaft, 2... Iron core, 3... Printed circuit board, 4
... Commutator, 5... Coil, 6... Capacitor,
7...Salient pole part, 8.12...End face, 9...Protruding piece, 10...Conductor surface, 11...Terminal, 13...Central part JP-A-3-143253 (4) ~ decrease

Claims (1)

[Claims] The iron core has a shaft, is fixed to the shaft and has a plurality of salient pole parts protruding in the radial direction, and has a central part superimposed on the end face in the axial direction of the core, and a central part extending radially from the central part. The commutator has a printed circuit board having a shape consisting of a protruding piece overlapping the end face of the salient pole part and a conductive surface formed on the outer surface, and is fixed to the shaft and provided with a terminal corresponding to the salient pole part. , a coil connected to the terminal and wound around the salient pole portion and the protrusion piece, and connected between the conductor surface of the tip portion of the protrusion piece exposed from the coil and the terminal. A rotor having a noise prevention capacitor housed between the coils of the salient pole portion.