Abstract: Some electric hair cutting devices have a stationary blade, a reciprocating blade, and an oscillating motor. Oscillating motors include pivot motors and linear motors. Both motors have a stator, an armature and at least one spring. The armature drives a load such as the reciprocating blade. The armature, the spring and the load have a mechanical resonant frequency. An H-bridge is supplied with pulse width modulated (PWM) signals from a controller and converts direct current from a battery to alternating current having the frequency of the PWM signals. The controller measures the mechanical resonant frequency when power to the motor is turned off and the armature continues to oscillate due to stored energy. The controller adjusts the frequency of the PWM signals to the measured mechanical resonant frequency and stores it in a memory for use the next time the motor is turned on.

Abstract: A hair clipper has a fixed blade, a reciprocating blade and a vibratory motor. The vibratory motor has a reciprocating armature operatively connected to the reciprocating blade, an electromagnet and a spring. The armature and the electromagnet are separated by an air gap. The armature moves during operation, which causes the air gap to change as the armature reciprocates. The electromagnet has a wire wound around a metallic core to form a plurality of windings. The electromagnet has an inductance that varies as the armature reciprocates and the air gap changes. A first end of the wire is electrically connected to an alternating current power source, and a second end of the wire is electrically connected to a first lead of a capacitor. The capacitor has a second lead which is electrically connected to the alternating current power source.

Abstract: A hair clipper with inertial load compensation includes a housing having a first end and a second end opposite the first end, a bladeset mounted to the housing at the first end. The bladeset includes a stationary blade, a moving blade movable relative to the stationary blade along a cutting axis in first and second directions to produce a cutting action, a cam follower mounted to the moving blade, and a tensioner in contact with the cam follower and arranged to bias the cam follower into engagement with the moving blade. One or more compensation elements contact the cam follower and are arranged to bias the cam follower in a direction parallel to the cutting axis.

Abstract: A hair clipper is provided, including a stator with a plurality of laminations, a bobbin located in operational relation to the stator and having a coil of wire wound around the bobbin, an armature being configured for driving a hair clipper moving blade at one end, and having at least one magnet at an opposite end, the armature having a pivot point, and the motor being configured for operation between 2.5 and 4.2 Volts.

Abstract: A pivot motor for a hair clipper is provided, including a stator with a plurality of laminations, a bobbin located in operational relation to the stator and having a coil of wire wound around the bobbin, an armature being configured for driving a hair clipper moving blade at one end, and having at least one magnet at an opposite end, the armature having a pivot point, and the motor being configured for operation between 2.5 and 4.2 Volts.

Abstract: A pivot motor for a hair clipper is provided, including a stator with a plurality of laminations, a bobbin located in operational relation to the stator and having a coil of wire wound around the bobbin, an armature being configured for driving a hair clipper moving blade at one end, and having at least one magnet at an opposite end, the armature having a pivot point, and the motor being configured for operation between 2.5 and 4.