Squirrel cage rotor
AssigneeWieland-Werke AG
InventorsGerhard Thumm, Volker Voggeser, Michael Wolf, Christoph Kästle, Michael Lieble
Life of this patent
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Abstract
A squirrel cage rotor, is made up of a shaft, a rotor laminated core with rotor bars which are arranged in the interior, and short-circuiting rings with clearances through which the bar ends of the rotor bars extend out of the rotor laminated core. The rotor bars, on their surface, at least partially have an electrical insulation layer, wherein the electrical insulation layer is cohesively connected only to the surface of the rotor bars. The squirrel cage rotor is intended, in particular, for use in an asynchronous machine.
Claims13
A squirrel cage rotor for an asynchronous machine, the squirrel cage rotor comprising:
- a shaft;
- a rotor laminated core having an interior;
- rotor bars arranged in the interior of the rotor laminated core, each rotor bar having a pair of bar ends;
- and
- short-circuiting rings with clearances through which the bar ends of the respective rotor bars extend out of the interior of the rotor laminated core;
- wherein the rotor bars each have an outer surface area including a radially outer surface area portion and a radially inner surface area portion, and the radially outer surface area portions or the radially inner surface area portions, or both of the radially outer surface area portions and the radially inner surface area portions, of the rotor bars have an electrical insulation layer disposed thereon and cohesively connected thereto such that part of the outer surface area of each of the rotor bars disposed within the interior of the rotor laminated core and radially between the radially outer surface area portion and the radially inner surface area portion of each of the rotor bars is free of the electrical insulating layer, the electrical insulating layer being disposed to prevent contact between the rotor bars and the rotor laminated core as a result of rotational forces occurring during operation of the asynchronous machine.
A squirrel cage rotor for an asynchronous machine, said squirrel cage rotor comprising:
- an elongated shaft defining a longitudinal axis;
- a laminated rotor core disposed on and extending axially along said shaft;
- a pair of short-circuiting rings disposed at respective opposite axial sides of said rotor core;
- a plurality of rotor bars extending through an interior of said rotor core and through said short-circuiting rings, each said rotor bar having spaced-apart opposite ends which extend outwardly through the respective short-circuiting rings, each said rotor bar having an outer surface area having a radially outer surface area portion and a radially inner surface area portion;
- and
- an electrically-insulating layer disposed on at least one of said radially outer surface area portion or said radially inner surface area portion, and part of said outer surface area of each of said rotor bars disposed between said radially outer surface area portion and said radially inner surface area portion and within said interior of said rotor core is free of said electrically-insulating layer.
Dependencies are inferred from the claim text.