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Copper Rotor Construction
TWMC high-speed synchronous machines feature a time tested and proven rotor construction design. For high torque transmission throughout its variable speed range, the rugged construction of these premium rotors are without equal.
The rotor construction starts with a high strength alloy steel shaft forging that is precision machined, ground and finished to our exact tolerances. Next the rotor spider is constructed from massive steel laminations and machined to mate with the shaft to form the rotor core assembly. Dovetail slots are then milled into the spider to accept the dovetailed pole pieces that are secured in place by tapered keys. Dovetail pole construction (pictured below) ensures a secure attachment to the shaft and spider.
Rotor poles are stacked from thin laminations bolted together to form the pole pieces. Field coils are edge-bent and strap wound, then insulated with a custom-designed thermosetting turn insulation system before being installed onto the rotor poles. Coils are staggered to allow for efficient heat transfer and are solidly braced at the final assembly stage.
Amortisseur windings use copper/copper alloy damper bars and segments. A shaped copper interconnect between adjacent poles alleviates thermal stresses which occur during starting. |
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