Abstract A rotor construction for a dynamoelectric machine is provided with the usual arrangement of longitudinally extending slots within which to receive the conductor bars of a distributed winding. Retainer bars making a dovetail connection with the outer ends of the rotor slots serve to secure the slot conductors in place, and end portions of these retainer bars extend beyond the rotor slots so as to overlie the end turn portions of the winding. In order to hold these portions of the retainer bars in place over the end turn portions of the winding a double layer helical wire winding is applied. The layers are wound from a single length of wire, which is of rectangular cross section and preferably made of a material which has high tensile strength and is also conductive such as bronze, and the opposite ends of the wire are anchored to the end heads of adjacent retainer bars. The wire is also soldered to the retainer bars so as to establish a short circuit ring interconnecting all of the retainer bars, also conductive, which thereby establishes a cage similar to that used in asynchronous motors.
In a rotor construction for a dynamoelectric machine the combination comprising a cylindrical rotor provided with a peripheral array of longitudinally extending slots in the outer surface thereof, a distributed winding for said rotor including conductor bars having longitudinally extending conductor portions disposed in said slots and end turn portions extending beyond said slots and which extend in a circumferential direction, retainer bars located in said rotor slots above the conductor bars for retaining the conductor bars in the slots, and retainer bars extendinG longitudinally to provide end portions which overlie said end turns on said winding and which terminate in end heads each including a trapezoidal configured portion engaged in a complementary configured slot in the rotor and a rectangular configured portion disposed above the surface of the rotor, a double layer helical wire winding applied on said end portions of said retainer bars for retaining said end turn portions of said conductor bars in place, said double layer helical winding being wound from one continuous length of wire having a rectangular cross section, the terminal ends of said wire being received in corresponding grooves in the end heads of adjacent end portions of said retainer bars, and plate members slidable into place between the undersurface of said rectangular configured portions of said end heads and the rotor surface to engage said terminal ends of said wire and secure them in place within said grooves.
Claim 2
Dependent Claim
236 words
In a rotor construction for a dynamoelectric machine the combination comprising a cylindrical rotor provided with a peripheral array of longitudinally extending slots in the outer surface thereof, a distributed winding for said rotor including conductor bars having longitudinally extending conductor portions disposed in said slots and end turn portions extending beyond said slots and which extend in a circumferential direction, retainer bars located in said rotor slots above the conductor bars for retaining the conductor bars in the slots, and retainer bars extendinG longitudinally to provide end portions which overlie said end turns on said winding and which terminate in end heads each including a trapezoidal configured portion engaged in a complementary configured slot in the rotor and a rectangular configured portion disposed above the surface of the rotor, a double layer helical wire winding applied on said end portions of said retainer bars for retaining said end turn portions of said conductor bars in place, said double layer helical winding being wound from one continuous length of wire having a rectangular cross section, the terminal ends of said wire being received in corresponding grooves in the end heads of adjacent end portions of said retainer bars, and plate members slidable into place between the undersurface of said rectangular configured portions of said end heads and the rotor surface to engage said terminal ends of said wire and secure them in place within said grooves.