JPS6359510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact device for a commutator of a rotating electrical machine, such as a motor, in which at least one rotating member extending through 360 degrees is provided and the commutator is arranged rotatably,
Furthermore, at least one crimping device is provided, which is fixedly arranged and projects at least partially into the rotating member, the force acting on the rotating member of the crimping device being substantially or completely connected to the commutator. Concerning forms suitable for areas that come into contact with.

Such a device is described in U.S. Patent No.
It is known from the specification of No. 341726 and the specification of JP-A-16003/1983. Such known contact devices have the disadvantage that they only work with small motors, require a very high force or power to operate the contact device, and are also expensive. There is.

The object of the invention is to provide a contact device which is simple in construction and does not require a very high power output, and which is suitable for all purposes.

In order to solve this problem, the present invention has a configuration in which the crimping device has at least two parts, these parts exert a force on the rotating member, and furthermore, the force action of the crimping device is mostly , or entirely between at least two parts which are spaced apart from each other in the circumferential direction of the rotating member and which surround an angular range of the rotating member. I did it like that.

The invention will be explained below with reference to the exemplary embodiments shown.

A finger-shaped structure that is generally rigid.
The crimping device 4, for example made of metal, is fixed by means of screws 5, 6 at a suitable location, for example to a brush holding plate (not shown), and is attached to a substantially rigid spherical end of the brush holding plate (see FIG. 1). 3
Three finger-shaped projections 1, 2, and 3 are crimped onto a rotating member 7 (rotary brush) made of spring steel. This maintains the endless rotating member 7 and also achieves a certain contact surface with the commutator 8. Advantageously, the rotating device comprises a ring 9 fixed to the commutator 8 and a disc 10 arranged laterally of the commutator, between which the rotating member rolls. A guide for the element 7 is used, which dampens vibrations.

When the commutator 8 is rotated in the direction of the arrow, the rotating member is carried along, the rotating member being held in this case by the finger-like projections 1, 2, 3, and the current flowing through the stationary rotating member. commutator 8 via the screws 5, 6 as current connections, the finger-like projections 1, 2, 3 of the fixed crimping device 4 and the rotary member 7.
flows into the individual commutator segments. The commutator strips are connected to the windings of the motor, and as is well known, the commutator strips are insulated from each other, so that switching between connecting and cutting off the current depends on the contact between the rotating member 7 and the commutator strips. It is done by twisting.

The crimping device 4 can, for example, omit the finger-shaped protrusion 1 disposed on the outside of the rotary member, or can have three or more finger-like protrusions.The rotary part 7 is rigid. In this case, the crimping device 4 is configured to be easily bent.

In the case of commutator pieces of normal shape, the crimping device 4
A relatively large force will be exerted on the rotary member 7, i.e. the rotary member will be deformed and the desired overlap will therefore not be obtained. Therefore, the edges of the commutator segments do not extend in the axial direction between the commutator segments as indicated by the dashed-dotted lines in FIGS. It extends at an angle to the axial direction of the commutator (see FIG. 3). Furthermore, an advantageous embodiment of the commutator bar 11 is shown in FIG. The commutator piece 11' shown in FIG.
That is, it has an axially extending section. Therefore, at the beginning and end of the current switching process,
A large contact surface between the rotating member and the commutator piece is obtained. This allows the current to be connected or interrupted quickly and precisely.

Commutators are also used to eliminate residual voltages caused by cutting off current to the windings, and this is done by connecting and shooting two adjacent commutator bars. In order to produce such a shot, if the commutator pieces are arranged so as to be intertwined with each other as shown in FIGS. 3 and 4 so that two commutator pieces overlap when viewed in the radial direction of the commutator 8, the rotating member 7 can contact two commutator bars at the same time. In particular, as in the embodiment shown in FIG. 4, the longer the axially extending edges of the commutator pieces, the more
The contact surface between the rotating member and the commutator bar is large at the beginning and end of the contact process, so that the current can be interrupted or connected quickly and precisely.

It is advantageous to equip the rotating member 7 with a friction ring, which rolls on the commutator with increased friction. FIG. 5 shows that the rotary member 7 has a toothed edge, so that the ring 9 in this case is a toothed ring and the perforated discs 10 are each a gearwheel with at least one tooth. be.
That is, the teeth of the rotary member, which are preferably serrated,
It engages guides 9, 10 of the rotating member, preferably made of plastic. This achieves a slip-free drive of the rotary member. Reference numeral 12 is a solid shaft.

[Brief explanation of the drawing]

1 is a cross-sectional view of a contact device according to the invention, FIG. 2 is a plan view, FIGS. 3 and 4 are side views showing different embodiments of a commutator according to the invention, and FIG.
6 and 6 are schematic diagrams showing different embodiments of the contact device. 1, 2, 3...Finger-shaped protrusion part, 4...
Crimping device, 5, 6...screw, 7...rotating member, 8
... Commutator, 9 ... Ring, 10 ... Disc, 11
... Commutator piece, 12 ... Solid shaft.

Claims (1)

[Claims] 1. A contact device for a commutator of a rotating electric machine, comprising at least one rotating member extending through 360 degrees, and in which the commutator is rotatably arranged. and further provided with at least one crimping device which is fixedly arranged and projects at least partially into the rotating member, the force acting on the rotating member of the crimping device being substantially or completely In the version intended for contact with the commutator, the crimping device 4 has at least two parts 1, 2, 3 which exert a force on the rotating member 7, and It is provided that the force action of the crimping device 4 takes place essentially or completely between at least two parts 2, 3, which parts are spaced apart from each other when viewed in the circumferential direction of the rotary member 7. A contact device for a commutator of a rotating electrical machine, characterized in that it has a rotary member 7 and encloses the angular range of the rotary member 7. 2. Commutation according to claim 1, in which guides 9, 10 for the rotating member 7 are provided, which guides rotate together with the commutator 8 and are connected to the angular range of the rotating member 7. Contact device for children. 3. Contact device for a commutator according to claim 1 or 2, in which the crimping device 4 engages with the inner and outer sides of the rotary member 7 by means of parts 1 to 3 of the crimping device. . 4 The crimping device 4 is formed in a finger shape,
4. A contact device for a commutator according to claim 1, wherein the force acting on the rotary member 7 is effected by finger-shaped projections 1-3. 5. Claims 1 to 4, in which the force acting on the rotary member 7 by at least two projecting portions 1 to 3 takes place essentially or completely in the half of the rotary member 7 that is in contact with the commutator 8. A contact device for a commutator according to any one of the preceding clauses. 6. Two mutually insulated commutator pieces 11, 11' located in parallel are overlapped over a larger angular range of the commutator circumferential surface than between the commutator pieces, and the commutator pieces 11' are Any one of claims 1 to 5, which extends substantially perpendicularly to the circumferential direction of the commutator 8 at least at the starting end and the terminal end when viewed in the circumferential direction of the commutator 8.
Contact device for the commutator described in Section 1.