JPS61218350A - Flat armature - Google Patents

Abstract

PURPOSE:To uniform positions related between armature windings and commutator segments, by providing key-shaped projections at the necks of the commutators, and by fitting positioning plates having key grooves, on one face of flat armature windings. CONSTITUTION:A plurality of flat armature windings 1-1-1-n are arranged in the shape of a circular flat sheet with the center of a rotor shaft, and on the one face, winding positioning plates 5 are fitted. A central hole 5-1 and a key-groove 5-2 are arranged to be formed on the central section of the winding positioning plate 5. A neck section 2a is provided for a commutator 2, and on the neck, a key-shaped projection 2c meeting the key-groove 5-2 is formed. As the result, after the armature windings 1-1-1-n are connected to each segment of the commutators 2 and when the whole unit is molded, a key- groove 5c is engaged with a key-shaped projection 2c, and so positional shift is not generated.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a flat armature, in particular a plurality of flat armature windings spaced apart from each other in the circumferential direction on one plane centered on the rotor axis. The present invention relates to a flat armature which is arranged together with a commutator and is integrally fixed to the rotor shaft.

(Conventional wave) Figures 1(a) and 1(b) show a conventional flat armature with part of the resin removed. Figure 1 (aL
(h) 1-1.1-2.1-3. ,,.

1-n is a plurality of flat armature windings, 2 is a commutator connected to these windings, 3 is a rotor shaft to which this commutator 2 is fixed, 4
is a resin that fixes all of these together.

To manufacture such a flat armature, first, as shown in FIG. 2, armature windings 1-1.1-2.1-3. ,,,
One side of l-n is successively overlapped with the adjacent windings, arranged in a substantially circular flat plate shape with the rotor shaft 3 at the center, and the spaces between the respective windings are temporarily fixed with an adhesive to maintain the circular shape. Next, each terminal 1c of the armature winding is connected to the segments of the commutator 2 in sequence according to a certain rule to form a wire assembly of the armature winding,
This completed wire assembly is placed in the space in the mold 10 shown in FIGS. 3(a) and 3(b), and resin is injected into the space in the mold and solidified to form a flat winding, a commutator, and a rotor. A flat armature is obtained by integrally fixing the shaft and the shaft.

In Figures 3(a) and (b), 11 is the upper mold, I2
1 is a lower mold, 13 is a resin injection hole, 14 is a cavity provided in the lower mold into which the armature is placed, 15 is a pin that connects the upper mold and the lower mold,
16 is a center pin that supports the center of the commutator, 17 is a pin that determines the position of the commutator, and 18 is a winding alignment mark provided on the edge of the lower die 12.

In the completed wire assembly shown in Figures 2(a) and (b), the armature winding and commutator 2 are connected only through the terminal IC of the armature winding, and their relative positions are uncertain. be.

However, in a flat armature, the mechanical angular position of the commutator segment to which the coil side of one armature winding and the terminal of this armature winding are connected is fixed. is a necessary requirement.

In other words, the armature winding connected to the segment of the commutator that is in contact with the brush and is supplied with power by the brush must always be in the neutral line of the field magnetic pole in order to obtain a good commutation state. If the position deviates from the neutral line, a short circuit current will flow due to the electromotive force generated in the armature winding connected between the multiple commutator segments that the brush straddles and contacts, causing a short-circuit current between the brush and the commutator. Sparks are generated, causing the electric motor to heat up and reduce its efficiency. Therefore, it is common practice to move the brush position a little to adjust the brush to the neutral line and fix it, but it is structurally impossible to take a large movement angle for this adjustment. Therefore, it becomes necessary to maintain a constant positional relationship between the armature winding and the corresponding commutator segment.

In the conventional flat armature, Fig. 3 (a), (b)
) As shown in FIG. 2 (
The completed wire assembly shown in a) and (b) is mounted with the commutator 2 facing down, and the commutator positioning pin 1 provided on the lower mold I2 is attached.
7 is fitted into the hole 2b provided on the end face of the commutator 2. As a result, the relative position between the commutator 2 and the lower die 12 is determined. Next, insert the armature winding 1 temporarily fixed in a circular shape into the cavity 14, and align the coil side of one armature winding with the positioning mark 18 provided on the edge of the lower mold 12. , align the upper mold 11 with the lower mold 12 using the pin 15 as a guide -F
When the mold and the lower mold are tightened and resin is injected through the injection hole 13 and solidified, the flat armature shown in FIG. 1 is completed.

However, the conventional manufacturing method described above requires a high degree of skill and careful work to align the positions of the armature windings and the commutator segments, and the completed flat electric machine A serious drawback was that the relative positions of the commutator segments on the child armature windings varied widely.

In other words, when the wire assembly is completed in which the flat armature winding and commutator segments temporarily fixed in a circle are connected as shown in Fig. 2, the armature winding and commutator are connected by the terminal wire of the armature winding. However, the mechanical positional relationship between them is unstable.

When installing this completed wire assembly into the mold shown in FIG. 3, the relationship between the commutator and the lower mold is established by first fitting the hole 2b provided on the end face of the commutator into the pin 17 provided on the lower mold. Although the position is determined constant, there is a positioning mark 18 provided on the lower mold at the position of one of the armature windings temporarily fixed in a circular shape.
Align the upper mold 11 with the lower mold 1 using the pin 15.
2, the armature winding in the cavity 14 is floating in the cavity, and neither the upper mold nor the lower mold can restrict its movement in the rotational direction within the plane, and the electric motor Although the child winding has a certain range in the direction of rotation,
It is in a state where it can move freely, and when melted resin is injected from the injection hole 13 in this state, the flat winding part moves due to the pressure of the inflowing resin, and it deviates from the position initially aligned with the alignment mark 18. As a result, the resin solidifies in the deviated position and the flat armature is completed, resulting in variations in the relative positions of the flat armature windings and the corresponding commutator segments.

(Object of the Invention) An object of the present invention is to obtain a flat armature winding which eliminates the drawbacks of the prior art as described above.

(Structure of the Invention) The flat armature of the present invention includes a plurality of flat armature windings arranged in a circular plate shape around the rotor axis and offset from each other in the circumferential direction, and a plurality of flat armature windings arranged in the circular flat plate shape as described above. A center hole fixed to a side surface of the center portion of the armature winding, a winding positioning plate composed of a thin insulating plate having a keyway, a commutator having a segment connecting terminals of the armature winding, and the winding The positioning plate is characterized by comprising a neck of a commutator mounted so that a key-shaped protrusion provided on the outside matches a keyway provided in a center hole of the winding positioning plate.

(Embodiments of the Invention) Examples of the flat armature of the present invention will be described below with reference to the drawings.

In the flat armature of the present invention, a winding positioning plate 5 is used.

Figure 4 (a), (b) and Figure 5 (a), (h)
1 shows details of a winding positioning plate 5 and a commutator 2 for keeping the relative position between the flat armature winding and the corresponding commutator segment 1- constant. In the figure, 5-1 is a center hole provided in the winding positioning plate 5, 5-2 is a keyway provided in the center hole 5-1, and 5-3 is an intermediate groove provided spaced apart from each other in the circumferential direction. , this positioning plate 5 is manufactured by punching out a thin insulating plate, and its outer diameter corresponds to the inner edge of the armature winding temporarily fixed in the shape of a circular flat plate. The inner diameter of the center hole 5-1 is smaller than the inner diameter of a magnet (not shown), and the inner diameter of the center hole 5-1 is approximately equal to the outer diameter of the neck 2a of the commutator 2 inserted therein. The size is large enough to fit the provided key-shaped projection 2c.

The flat armature according to the present invention is shown in FIGS. 6(a) and (b).
As shown in the figure, the armature winding 1- is wound in an annular flat shape which is arranged in a circular plate shape and temporarily fixed so as to be offset from each other in the circumferential direction.
1. 1-2. 1-3. , , , 1-n has a winding positioning plate 5 shown in FIGS. 4(a) and 4(b) on the side surface of the center thereof, and the key groove 5-2 provided in the center hole is a flat winding with one position. Fix it so that it matches the position on one side of the line.

As described above, according to the present invention, the position of the keyway 5-2 of the winding positioning plate 5 and the position of one side of the flat armature winding are set in a constant relationship, so that the distance between each product There is very little variation.

The neck 2a of the commutator 2 is located in the center hole 5-1 of the winding positioning plate 5 of the flat winding in the temporarily fixed state shown in FIGS. It is inserted so as to match the keyway 5-2 of the positioning plate. As a result, the plurality of flat armature windings and the corresponding commutator segments are maintained in a constant relationship and engaged. In this state, when the terminals 1c of the plurality of flat armature windings are connected to the corresponding commutator segments, MlIIIA is completed as shown in FIG. 7(a).

The armature shown in Figures 7(a) to (c) with completed wire assembly is
It has many advantages over the conventional assembled wire assembly product numbers shown in Part 2 (a) and (b). That is, FIGS. 7(a) to (C
) shows a completed wire assembly according to the present invention, which includes a winding positioning plate 5 fixed to the center of the flat armature winding and a neck 2 of the commutator 2.
a are engaged through the center hole 5-1 and the keyway 5-2, so the mechanical relationship between the commutator 2 and the flat plate winding is restricted in the center direction and rotation direction. Always in a constant relationship without moving.

As shown in Figures 2(a) and (b), the windings and commutator are connected only by the terminal wires of the windings, and the mechanical relationship between them is unstable. It is obvious that it is much easier to handle than complete wire products.

Further, according to the present invention, it is easy to keep the relative position between the armature winding and the corresponding commutator segment always constant, and there is a great advantage that products with little variation can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are a partially sectional plan view and side view of a conventional flat armature, and Figures 2 (a) and (
b) is a plan view and a front view of a completed m-wire assembly consisting of an armature winding and a commutator, and Figures 3 (a) and (b) are cross-sectional views showing a mold and a completed wire assembly, and a plane of the lower mold. Figure 4(a)
. (b) is a plan view and a longitudinal sectional front view of the winding positioning plate used in the present invention, FIGS. 5(a) and (h) are a front view and a bottom view of the commutator, and FIG. 6(a) , (h) is a front view and a bottom view of the armature winding of the present invention, and FIGS. 7(a) to (
C) is a front view, a bottom view, and a perspective view of the armature in a completed wire assembly state, respectively. 1.1-1.1-2.1 3. ,,, ], -n... Armature winding, 1c... Terminal, 2... Commutator, 3...
Rotor shaft, 4... Resin, 5... Positioning plate, 5-1
... Center hole, 5-2 ... Keyway, 5-3 ... Intermediate groove, 10 ... Mold, 11 ... Upper mold, 12 ... Lower mold, 13 ... Injection hole , 14... Cavity, 15... Pin, I6... Center pin, 17... Pin, 18... Positioning mark, 2a... Neck, 2b... Hole, 2c
...Key-like projection. Agent Patent Attorney Makoto Sawaki - +1 area (0) Spear 1m (b) To p! 71-4 country (Q) +50 (G) +60 (
G) C 160(b)

Claims (1)

[Claims] A plurality of flat armature windings arranged circumferentially offset from each other in a circular flat plate shape around the rotor axis, and a central hole fixed to a side surface of the center of the armature winding arranged in a circular flat plate shape. a winding positioning plate composed of an insulating thin plate having a keyway; a commutator having segments connecting terminals of the armature winding; and a key-shaped protrusion provided on the outside of the winding positioning plate; A flat armature comprising a commutator neck fitted so as to fit into a keyway provided in a center hole of a winding positioning plate.