SK124594A3 - Collecting ring or commutator of motor with ring anchor - Google Patents

Abstract

Wollastonite (CaSiO3) with a structure in the form of needles is added as a filler to the phenol resin moulding compound for the supporting body of the sliprings and of the commutator laminates in order to produce an asbestos-free slipring arrangement and commutator arrangement.

Description

The invention relates to an annular motor or an anchor motor. a commutator motor according to the general concept of claim 1; to whom ·? ' The torque motor is known e.g. from EP-A1-0 482 235.

BACKGROUND OF THE INVENTION

Slip rings, resp. slats, with ring anchor motor a stator brushed commutator motor for powering the rotor are held at the outer periphery of the support body, mounted radially inside the rotor shaft, which generally consists of a pressed mass, in particular a pressed mass of phenolic resin, and to which it is attached as a tensioning material fillers. It is known to be more admixture than asbestos fibers, which are characterized by high thermal stability, mechanical strength, good bonding ability and high filling density, but because of their low biocompatibility they are undesirable, even prohibited by lawmakers.

On the full or. Partial replacement of asbestos was attempted to use glass fiber fillers, respectively. however, due to their low elasticity, their non-existent water regime, their low resistance to welding temperatures, as well as their poor bonding capacity to the other pressing meat, respectively. to the copper segments of the slip ring; slats and because of their large expansion coefficient did not lead to the desired success.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a substitute filler for asbestos which, with good tolerability, meets the asbestos-exhibited hitherto asbestos-specific, advantageous material properties and is also applicable to annular anchor motors and / or motors. commutator motors, manufactured as mass products on a mass scale.

The solution to this task is successful with the ring anchor motor, or. a cornutator motor of the kind initially mentioned by admixing the molded composition with wollastonite, preferably structured in the form of needles, in a proportion of about 7% to 70% of the total filler content (100%). The needle length / thickness ratio of the needle-to-plastic ratio of the filler is preferably between 30: 1 and 35: 1.

The increasing proportion of filler is preferably built by the appropriate addition of glass fibers and / or glass beads.

Wollastonite is calcium silicate (CaSiO-) and belongs to

J group v. naturally occurring silicates with a chain structure, the direction of chain tetrs.édrov- / SiO _and / corresponds to cut through later-stretching of the needle-like / olastonitových particles. The crystallographic property of wollastonite results in a high mechanical strength, whereby the tensile strength and the modulus of elasticity lie significantly higher than for a phenolic resin molding composition. Surprisingly, it has been found that the wollsstonite filler is already compared with fillers already in the form of glass fibers, respectively. glass beads, can provide not only high thermal stability and high fill density, but also high specific thermal conductivity and good welding temperature resistance with high thermal stability when welding a commutator hook, as well as low contraction and low expansion coefficient at low expansion coefficient .

The above-mentioned advantageous specific properties are associated with high biocompatibility due to the rapid degradability of fibers penetrated into the human lungs within 3 to 15 days compared to a time interval of about 100 days for glass fibers, respectively. 40,000 to 60,000 days for asbestos materials used so far.

By preferably treating the surface of the wollastonite particles with a protective layer by silane (especially epoxy, amino and methacrylsilanes), it is possible in particular to improve the bonding ability between the resin matrix of the phenolic resin molded mass intended for the support body and the filler.

Claims (6)

PATENT CLAIMS 1. Ring anchor motor, resp. a commutator motor with a filler containing a molded mass of a slip ring, respectively. a molded mass of the collector, in particular a molded mass of phenolic resin, as a support for the slip ring surface, or the like; a lamellar surface, abraded with contacts, characterized in a / ollastonite filler having a proportion of about 7% -70% of the total filler. 2. Motor with ring anchor, resp. A commutator motor according to claim 1, characterized in that it is in the form of needles in ollastonite filler. 3. Ring anchor motor, resp. A commutator motor according to claim 2, characterized by a wollastonite filler length / thickness (L / H) ratio of needles in the form of needles in the range of 3C: 1 to 35: 1. 4. Motor with ring anchor, resp. A commutator motor according to any one of claims 1-4, characterized by an ollastonite filler, a pre-treated sizing. 5. Ring anchor motor, resp. The commutator motor according to claim 4, characterized by a silanizing protective layer of a Wollasionite filler. 6. Motor with ring anchor, resp. The commutator motor according to one of claims 1-5, characterized by a further filler in the form of glass fibers and / or glass beads.