Rotor of an asynchronous machine with retaining element
AssigneeSiemens Aktiengesellschaft
InventorVolker Dölz
Life of this patent
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Abstract
A squirrel-cage rotor of an asynchronous machine, in particular a die-cast rotor, includes a rotatable shaft, a laminated core being rotation-locked on the shaft and having grooves and opposing end faces. A squirrel-cage winding has rotor rods disposed in the grooves and a cage ring disposed on each of the end faces and electrically connecting the rotor rods. A pair of retaining elements is disposed on the shaft, wherein each retaining element extends in a radial direction in form of a disk or a spoke and has in an axial direction a wall and/or an axially extending finger. The wall overlaps on a radial periphery in the axial direction both the cage ring and a predefined axial section of the rotor rods that terminate in the cage ring, without increasing an external diameter of the laminated core.
Claims12
A squirrel-cage rotor of an asynchronous machine, comprising:
- a shaft rotatable about an axis;
- a laminated core being rotation-locked on the shaft and having grooves arranged in the laminated core and opposing end faces, wherein the laminated core has an outside diameter and axially extending end sections of the laminated core proximate to the end faces have an outside diameter that is smaller than the outside diameter of the laminated core;
- a squirrel-cage winding having rotor rods disposed in the grooves and a cage ring disposed on each of the end faces in one-to-one correspondence and electrically connecting the rotor rods;
- and
- a pair of retaining elements disposed on the shaft, wherein each end face of the laminated core has one of the retaining elements, each retaining element extending in a radial direction in form of a disk or a spoke and having at least one of an axially extending cylindrical wall and an axially extending finger extending from on an outer peripheral end section of the respective disk or spoke, wherein the axially extending cylindrical wall or the axially extending finger overlaps at each end section in the axial direction both the cage ring and a respective predefined axial section of the rotor rods that terminate in the cage ring, as well as the axially extending end sections of the laminated core, without increasing the outside diameter of the laminated core.
An asynchronous machine, comprising a squirrel-cage rotor, said squirrel-cage rotor comprising:
- a shaft rotatable about an axis;
- a laminated core being rotation-locked on the shaft and having grooves arranged in the laminated core and opposing end faces;
- a squirrel-cage winding having rotor rods disposed in the grooves and a cage ring disposed on each of the end faces in one-to-one correspondence and electrically connecting the rotor rods;
- and
- a shaft rotatable about an axis;
- a laminated core being rotation-locked on the shaft and having grooves arranged in the laminated core and opposing end faces, wherein the laminated core has an outside diameter and axially extending end sections of the laminated core proximate to the end faces have an outside diameter that is smaller than the outside diameter of the laminated core;
- a squirrel-cage winding having rotor rods disposed in the grooves and a cage ring disposed on each of the end faces in one-to-one correspondence and electrically connecting the rotor rods;
- and
- a pair of retaining elements disposed on the shaft, wherein each end face of the laminated core has one of the retaining elements, each retaining element extending in a radial direction in form of a disk or a spoke and having at least one of an axially extending cylindrical wall and an axially extending finger extending from on an outer peripheral end section of the disk or spoke, wherein the axially extending cylindrical wall or the axially extending finger overlaps at each end section in the axial direction both the cage ring and a respective predefined axial section of the rotor rods that terminate in the cage ring, as well as the axially extending end sections of the laminated core, without increasing the outside diameter of the laminated core.
A method for manufacturing a squirrel-cage rotor of an asynchronous machine, comprising:
- stacking or in-die stacking of a laminated core of the squirrel-cage rotor;
- positioning a squirrel-cage winding in the laminated core;
- connecting the laminated core of the squirrel-cage rotor to a shaft in a rotatably fixed manner;
- removing material at two end faces of the laminated core at a corresponding radial periphery of the laminated core wherein the laminated core has an outside diameter and axially extending end sections of the laminated core proximate to the end faces have an outside diameter that is smaller than the outside diameter of the laminated core;
- and
- connecting a retaining element to the shaft in a rotatably fixed manner such that at least one of a wall and a finger extends axially over the cage ring and the part of the laminated core and the radial periphery from which the material was removed, without increasing an outside diameter of the laminated core.
Dependencies are inferred from the claim text.