The disc-type rotor is a constructive alternative to the classical machine. Its advantage consists in the given construction room for generating torque being used more extensively and thus enabling an increase in torque. This point can be of great interest when equipping high-class vehicles with starter-generators, as these vehicles are almost exclusively fitted with automatic transmission. The clutch is non-existent and as a result its construction space can be used as magnetically active, torque-increasing space. In comparison to the classical machine a further advantage is to be seen in the smaller inertia moment and yet same power output. In the given example the inertia moment is approximately 30 % smaller which has advantages in dynamic closed-loop control. The main disadvantage is found in the effect of Maxwell's tensile stresses. In contrast to the classical machine design, the resulting axial forces do not self-compensate in disc-type rotors. They have to be neutralized by a special construction. It is insignificant if the disc-type rotor is designed as an asynchronous machine or permanentmagnetic synchronous machine. The resulting axial force is considerable as underlined by the sample calculation with the usual main measurements (outer diameter Da = 305 mm; inner diameter di = 182 mm) and the induction amplitude Bmax (1 Vs/m2). In fact, it reaches an average value of Faxial = 9358 N. The line of action of this axial force attempts to reduce the rather small air gap even further. There is an increased danger of grazing between rotor and stator if sufficient constructional measures are not taken. The conclusion to be drawn from this contribution is that the disc-type rotor design is not to be used for the first generation of starter-generators, rather would only be considered for the second generation of starter-generators at the earliest.


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    Title :

    Integrated asynchronous starter-generator in disc-rotor design?


    Contributors:


    Publication date :

    2003


    Size :

    11 Seiten, 10 Bilder, 10 Quellen



    Type of media :

    Article/Chapter (Book)


    Type of material :

    Print


    Language :

    English




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