Patent ID: 6302826
Filing Date: 2001-10-16
Classification: A63B,H02K

Abstract:
A direct drive system for an electric treadmill comprising:(a) a frame;(b) a fixing axle extending between opposed portions of said frame;(c) a pair of turning wheels coaxially coupled in angularly displaceable manner to said fixing axle, each said turning wheel having a substantially U-shaped sectional contour defining a recess and an inner rim wall surface extending thereabout,(d) a plurality of permanent magnets coupled to said inner rim wall surface for each said turning wheel,(e) a pair of fixing sockets coupled to said fixing axle to extend respectively into said recesses of said turning wheels;(f) a pair of stator cores coupled respectively to said fixing sockets, each said stator core being radially spaced from said permanent magnets of one said turning wheel, each said stator core having coil windings formed thereon;(g) a driving roller extending axially between said turning wheels for engaging one end portion of an endless running belt; and,(h) a current control unit coupled to each of said stator cores, said current control unit being operable to adjustably energize said stator cores for brushless motor coupling with said permanent magnets of said turning wheels responsive to AC power and user inputs;whereby said driving roller is selectively rotated about said fixing axle to drive the looped displacement of the endless running belt.