Improved starting arrangement for single-phase induction motors


997,433. Control of A.C. motors; electromagnetic relays. LICENTIA PATENTVERWALTUNGS-G.m.b.H. Nov. 24, 1961, No. 42143/61. Headings H2B and H2J. A starting arrangement for a single phase induction motor having a main winding Ha and an auxiliary starting winding Hi comprises a series circuit formed by the winding Hi, a capacitor KB and a relay coil R and connected in parallel with the winding Ha, a second capacitor KA and contacts RK in series therewith being arranged in parallel with the capacitor KB and coil R. The contacts RK open when a predetermined minimum value of current passes through the coil R. The relay comprises a two-part housing 5 and L-shaped stationary contacts 6, 7 bridged by a moving contact 9, the contacts opening when a coil 8 is energized. Contact pressure is exerted by the weight of an armature 10 through a compression spring 11, the armature sliding along a sleeve 12 held on a centre pin 13. The ratio between the current values at which the contacts are opened and closed can be set by adjusting the position of a ferromagnetic core carried on the pin 13. When coil 8 is energized and armature 10 is initially attracted contact 9 is held in the closed position, while spring 11 expands, until the top of the armature hits a flange at the upper end of sleeve 12. The contact 9 is then lifted off the contacts 6, 7 by a flange at the lower end of the sleeve 12.




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Cited By (3)

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    CN-100414832-CAugust 27, 2008巴西船用压缩机有限公司用于单相感应电动机的起动装置和起动方法
    US-7471058-B2December 30, 2008Empresa Brasileira De Compressores S.A.Starting device and starting method for a single-phase induction motor
    WO-2005034330-A1April 14, 2005Empresa Brasileira De Compressores S.A. - EmbracoStarting device and starting method for a single-phase induction motor