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Asynchronous machine
| Details |
Inventors: Vlemmings, Johannes; Roth, Karl-Juergen;
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Examiner: Schuberg; Darren
Assistant Examiner: Mohandesi; Iraj A.
Attorney, Agent or Firm: Striker; Michael J.
A synchronous machine (10), in particular, for a starter-generator of an internal combustion engine, includes a stator, a rotor (22) having a rotor shaft (24), a stack of sheets (28), and squirrel cage (30) non-rotatably connected with the rotor shaft (24) and the stack of sheets (28). The squirrel cage (30) has a short circuit ring (36) on its opposite front ends, which is secured to an annular reinforcement element (40, 42). The reinforcement elements (40, 42) do not overlap adjacent, outer circumferential surfaces of the squirrel cage (32) or the short circuit rings (36). |
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DETAILED DESCRIPTION In contrast, the asynchronous machine of the present invention offers the advantage that with the both reinforcement elements opening to an air gap, a magnetic inference for the stray field on the front ends of the rotor can be avoided, so that the reinforcement elements can be manufactured from cost-effective, magnetic steel that is easier to machine, but which nevertheless enables sufficient protection against centrifugal force-related deformation of the short circuit rings.
Stability analyses surprisingly have provided that the highest material demands occur on the inner diameter of the short circuit rings, which concurs with the observed forms of damage with warping or bending out of the short circuit rings beginning at the inner diameter.
In order to prevent plastic deformation of the short circuit rings on these points of the highest material demand, according to the analyses of the present invention, it suffices that the reinforcement elements are mounted only in the area of the face surfaces of the short circuit rings and serve purely as axially supports of the short circuit rings.
In a preferred form of the present invention, it is provided that the reinforcement elements are flush on their outer circumference with adjacent, outer circumferential surfaces of the short circuit rings, while they can overlie on their inner circumference adjacent, inner circumferential surfaces of the short circuit rings, so that the entire face surface of the short circuit rings and in particular, the area of the highest material demand, is supported by the respective reinforcement element, without interfering with insertion of the rotor in the housing through the outer circumference of the front reinforcement ring.
According to a further preferred embodiment of the invention, the short circuit rings or squirrel cage are braced between the reinforcement elements, in which at least one of the reinforcement elements is pressed in the axial direction against the adjacent short circuit ring, so that also with high speeds, it cannot be pressed away in the event the yielding point of the copper in the short circuit ring should be exceeded in the area of the solder points
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