Electromotive variable-speed and control drive particularly for use in industrial sewing machines

An electromotive variable-speed and control device particularly for use in industrial sewing machines comprising:

• a motor capable of continuous drive and having a motor shaft, a flywheel having a clutch surface and connected to said motor shaft, and a clutch-brake unit for selectively connecting said motor shaft to a drive shaft, said clutch-brake unit comprising a clutch-brake disk which is connected to said drive shaft non-rotatably with respect thereto, said clutch-brake unit also comprising non-rotatable brake bearing bracket having a brake surface, said clutch-brake disk being brought into friction engagement optionally with said brake surface of said brake bearing bracket or optionally with said clutch surface of said flywheel, said motor having a stator frame and an outer shell confining a cooling region surrounding said stator frame, said flywheel, when rotating, forming a fan sucking cooling air, cooling channels confined by cooling ribs being provided at said stator frame and said fan being in the form of an axial-radial blower having a suction region extending close to said clutch surface, said suction region comprising an annular recess in said flywheel and including radial channels leading out from said recess, ribs on said flywheel and an air conductor ring attached to said ribs, said radial channels being confined by said ribs on said flywheel and by said air conductor ring, and said air conductor ring being rotatable with said flywheel.