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View sample product designs including:
Wound Rotor Motor Rings
This picture shows three different designs of wound rotor rings. They are all made with stainless steel using 3/16" wall G10 tubing to insulate the rings from the hub. The ring set on the left is from a Westinghouse motor. The original design uses a buss strap which we convert to a stud design in many cases. This improves the insulation characteristics. We also use 3/16" wall G10 tubing on the studs.
This set of rings is for a GE 6000 hp wound rotor motor. The hub is manufactured in three sections to make installation easier. The rings are a split design as well, so they can be removed without disturbing any part of the motor other than the brush holders. With this design any one of the three rings can be removed without affecting the other rings or their connections.
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3600 RPM Steam Turbine Generator Field Rings
The field rings to the right are for an ABB 500 megawatt steam turbine generator. The original design required the shaft to be insulated in place, which involved building an oven around the shaft to bake the insulation. The next step was turning the insulation in place and then installing the rings. Our customer said this process normally took about 5 days compared to one day for our design.
The two rings to the left are the field rings for a Westinghouse steam turbine powered generator.
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Synchronous Motor Rings To the right is a Cutsforth Products designed collector ring (split ring and split hub), using thick wall insulation as the hub. The design eliminates the alignment difficulties inherent with OEM designs, can be completely installed on site and in much less time.
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Hydro Generator Split Rings The photos to the left are of a split ring design designed by Cutsforth Products. With split rings, the rotor does not have to be pulled to install new rings. The connection is achieved within the width of the ring even though the height of the ring above the hub insulation is only 1-1/4". In addition, the tapered joint assures that there is no gap.
The picture to the right is one ring of a set of two produced by Cutsforth Products, Inc. for a hydro generator. These rings were made out of stainless steel and were designed split so that they could be installed without dismantling the generator.
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Collector Ring Assemblies To the left is a ring assembly with the holders mounted in the cover. The brushes are released after the door is shut. The unit is completely sealed to keep contamination out. Below this picture is a collector assembly out of a dragline in Canada. It was rebuilt, replacing the rings, the insulation and the brush holders.
The collector ring assembly on the right supplies power to four three-phase motors at the end of four booms in a sewage treatment plant. The brush holder portion of the assembly is supported by two non-conducting rings. The complete assembly splits in half from top to bottom so that equipment doesn't need to be dismantled to install a new assembly.
This ring assembly is from an Ohio rail crane. The original design had the brush holders mounted to the truck body and the rings mounted to the rotating crane portion. This design allowed so much movement when lifting a load that brushes would pop out of the holder and short-out to the ring below. In our design the holder portion is supported by the ring portion so that they always stay in line.
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