ELECTRIC MOTOR FOR DOMESTIC SEWING MACHINES Russian patent published in 1997 - IPC

FIELD: electrical engineering; controlled drive motors of sewing machines. SUBSTANCE: motor 2 has stator 15 mounted in frame and rotor 5 installed on shaft placed in bearings 6, 7 in the form of bushes with spherical outer surfaces. Taper seats 8 are provided in frame to receive bearings 6, 7. Locating bore for shaft in at least one bearing is eccentric relative to its spherical and eccentricity is calculated by suing formula $$$, where h is eccentrically value; $$$ is maximum and minimum tolerance for size providing maximum deviation of rotor-to-stator gap from its rated value, mm; n is quantity of sizes. Frame 9 of motor 2 has ports 13 on side of spherical surfaces for turning bearings 6, 7 in seats 8. EFFECT: simplified and reliable adjustment of motor air gap, extended service life, and reduced cost due to provision for readjustment and restoration of gap and friction surfaces. 2 cl, 3 dwg