Synopsis
GoMPAR i TlVE STUDY CF VkRIABL xGP l.ED GOITRCL. T:her-o has TD een for a number of years and imperative deriand for variable speed motors for the direct drivinf of r.iachinery. It is the general opinion thit the great bulk of r-achinery in the future is to be driven by electric motors rather than belt drivers. Th.ere are a uiiraber of important conditions that are essential and which r;.ust be met in order that variable speed notora j--.hall cone into general use. A nong thesw nay be rr.er.tioned: nonspai-king -u TiCier excessive loads; large range of speeds: speed to be constant at all loads where adjusted to any desired speed: compactness: simple mechanical construction; reversibility: lightest possible weight; and hiigh efficiency under average loads. The different methods by wliich variable speed of motors is obtained arc as follows:- Rheostat in th.e annative ciicuit. Rlieostat in the field circiiit. Gom.bination of 1st, and nd. hulti vo11a ge system. 5th. Variations of air gap, or variation of magnetic re: luctance in tlxe field circuit, th. inte- -rolc i.iethod. by inti Oducing a variable resistance in the armature cii-cuit, thus controlling the voltage impressed on the armature terminals, a variation in sneed from zero to a maximium may be obtained. JB ut this is a very vasteful method, ar.
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