AT502570B1 - GRINDING-FREE, MECHANICAL MULTIPLEX SWITCH (COMMUTATOR) FOR ELECTRICAL MACHINES - Google Patents

Description

2 AT 502 570 B1

Gleitreibungsfreier, mechanical multiplex switch for electrical machines and devices

The invention relates to a continuation of the friction friction-free multiplex switch according to patent AT 501 305 B1. The design there has the disadvantage that it is only suitable for electric motors with external rotor. In many cases, however, it is constructively advantageous that internal rotor made of permanent magnets are used and the stationary field magnets are arranged outside of the rotor.

As already stated in the parent patent AT 501 305 B1, there are already solutions which replace sliding contacts on commutators by rolling contacts in order to prevent abrasion between the moving parts:

The arrangement in DE 102 23 361 C1 z. B. makes electrical contact to each other by rolling two rigid cylindrical surfaces, but with the disadvantage that the desired contact surface degenerates to a (nearly) one-dimensional geometry, and thereby large streams can not be transmitted efficiently.

This disadvantage is avoided in the patents US 5501604 A and US 5829986 A in that an arrangement such as a planetary gear consisting of sun, the planet and ring gear, in which the electrically conductive connection between the sun and ring gear is made by the planet, as electrically conductive and flexible bands are executed. Due to the resilience of the bands, a larger contact surface is present at the contact points than in the case of rigid geometries, as in DE 102 23 361 C1.

However, the arrangement described in the parent patent AT 501 305 B1 dispenses with the production of electrical rolling contact between a stationary and a rotating system by means of a planetary gear stage (as in the patents US 5501504 A and US 5829986 A), but has the advantage of being eccentric to the Commutator cylinder arranged contact band and caused by the only slightly larger diameter of the band compared to the diameter of the commutator a much lower deformation of this band at the contact point. In particular, this applies to the contact of the planetary moving belt to the sun gear of said US patents, but also for the contact between the ring gear and the planetary moving belt. This fact makes the arrangement to be described here more durable (when using comparable materials for the tape). At the same time it is much simpler in construction. For electric motors / generators, the rotors without power supply, because permanent magnets are used, the o. A. Dispensing with the electrical connection between stationary and rotating system no disadvantage. The electrical connection between two stationary tracks by the rolling and eccentric belt is sufficient for the functioning of the electric machine.

The arrangement described here is based on claims 1 to 3 of the parent patent AT 501 305 B1, with the difference that the commutator surface is not the (outer) lateral surface of a cylinder on which the electrically conductive strips (4, FIG , 2), but the cylindrical inner side of a hollow cylinder (3, Fig. 1, 2) on which the four electrically conductive and mutually insulated tracks (5, 6, 7, 8, Fig. 1) are applied.

Accordingly, the bands (4, Fig. 1, 2) in the mechanically unloaded state, a cylindrical ring with a smaller diameter than the Kommutatorinnenzylinder.

Consequently, it applies here that the bands (4, FIG. 1, 2) are deformed by bending on entering the area of the pressure rollers in such a way that they adapt to the larger diameter of the commutator inner cylinder compared to their unloaded diameter and engage there.

Claims (1)

3 AT 502 570 B1 gen. To claim: Sliding friction or friction friction mechanical multiplex switch for electrical machines and devices with two fixed, cylindrical, parallel and electrically conductive tracks (5, 6), which are arranged electrically isolated from each other, wherein at least one of the tracks at least at two points of its circumference transversely to the web is galvanically interrupted, both webs are electrically connected by an electrically conductive and self-contained band (4) or a band-like construction that rests along part of the web circumference, and the tape (4) or the tape-like construction is pressed against the webs by a pressure unit (9) rotating concentrically with the webs (5, 6) with one, two or more rollers (11) and by the rotation of the pressure unit on the webbing Rolls webs, and the area in which the tape (4) during one revolution of the pressure unit (9 ) rests on the Kommutatorbahnen (5, 6), is defined by the geometry of the pressure unit (9), according to claims 1 to 3 of patent AT 501 305 B1, characterized in that the cylindrical tracks on which the band (4) Consequently, the inner surface of a hollow cylinder is such that the band or band-like construction has a smaller circumference than the hollow cylindrical sheaths of the webs (5, 6) and that the pressure unit (9) thereby lies within the webs (5, 6). For this purpose 2 sheets of drawings