Abstract: An alternating current motor may include a rotor configured to rotate about a longitudinal axis, the rotor comprising a diametrically magnetized permanent magnet. Furthermore, the alternating current motor may include stationary coils having a magnetic axis substantially perpendicular to the rotor's longitudinal axis, the stationary coils adapted to the rotor's outer periphery and being substantially coaxial with the rotor's longitudinal axis. In addition, the alternating current motor may include a stator adapted to the stationary coils' outer periphery and being substantially coaxial with the rotor's longitudinal axis, wherein the diametrically magnetized permanent magnet is configured to cause the rotor's oscillation angle to vary no more than 30% between the rotor's oscillation angle at a beginning value of a frequency range of an alternating current in the stationary coil and the rotor's oscillation angle at an ending value of the frequency range of the alternating current in the stationary coil.

Abstract: An apparatus for personal hygiene, in particular for oral hygiene which includes a reservoir removably fitted on a casing for containing a liquid supply, and, furthermore, structure is provided for receiving a dispenser of a hygienic, cosmetic or therapeutic product, in particular a dentifrice solution, for addition to the liquid in the reservoir. For facilitating bucco-dental hygiene, the apparatus also includes a hydraulic pump within the casing connected by a flexible tubing to a handpiece having any particular type of spray head. The reservoir is adapted to supply liquid to the pump and, at the same time, is designed to receive the dentifrice solution from the dispenser. The dispenser structure can be independently formed and mounted on the apparatus casing or can be incorporated into the reservoir structure. The apparatus is also designed to serve as a cleaning device for dentures, and in this connection, the dispenser would contain a cleaning fluid for dispensing into the reservoir.