Importance

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Abstract

A machine for floor maintenance comprising an electric motor in which armature coils are included in a stator and permanent magnets are included in a rotor. The armature coils are disposed substantially radial to the axis of the stator with the axial extent of each coil lesser than the radial extent of each coil, and the permanent magnets of the rotor are disposed substantially radially to the axis of rotation of the rotor with the axial extent of each permanent magnet lesser than the radial extent of each permanent magnet. A three phase switching circuit excites the armature coils in impart rotation to the rotor. As a consequence thereof, the motor has a configuration conforming substantially to the pad or brush of the machine. The pad is attached to the rotor by a pad holder which is formed with a convex surface for engaging the pad. By virtue of this arrangement, increased force from the weight of the machine is applied to the area surrounding the axial opening of the pad with a lesser amount of force from the weight of the machine applied to the circumferential area of the pad.

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First Claim