A hair cutter with an energy storage device is provided. The energy storage device is connected to the motor through a circuit that powers the motor to oscillate a translating blade over a stationary blade. When the hair cutter is operating the energy storage device is discharged. When the energy storage device is completely discharged, the hair cutter is recharged, for example, by connecting the hair cutter to a power outlet. The electrical circuit connects the energy storage device to a voltage and/or current input to charge the energy storage device. In various specific embodiments, the energy storage device is a hybrid capacitor that includes characteristics of a supercapacitor and a lithium-ion battery.

An electric razor is provided with a linear actuator having a stator which includes an electromagnet and also having a moving element which includes a permanent magnet. The electric razor is also provided with an amplitude control unit and a control/output unit, which detect the amplitude and speed of the moving element on the basis of an induced voltage occurring in the winding of the stator as the moving element reciprocates, compare the detected speed and a formerly detected speed, and, according to the difference representing the result of the comparison, change a method for controlling the moving element.

The present invention relates to the field of small electrical appliances such as battery powered electrical appliances for personal hygiene, in particular to a hair removal device such as an electric shaver or epilator as well as an electric toothbrush. The small electrical appliance comprises an electric load, wherein the electric load heats up during operation; a measuring circuitry for measuring an electrical parameter of the electric load; a temperature sensor arranged spatially separated from the electric load; and control circuitry adapted to protect the electric load from overheating by controlling the electric load based on the electrical parameter of the electric load and an output of the temperature sensor.

The linear moto includes a bracket, two elastic support modules, a driving assembly, and a motion assembly suspended above the driving assembly. The driving assembly is mounted on the bracket and configured to drive the motion assembly to reciprocate in a predetermined direction. The motion assembly has two ends in the predetermined direction, two elastic support modules are configured to connect the two ends to the bracket, respectively. Each of the two elastic support modules includes a plate spring sheet, an adapter assembly, and a first connection member, the plate spring sheet has a first connection end and a second connection end, the first connection end is fixedly connected to the motion assembly, the first connection member extends through and connects to the second connection end and the adapter assembly, the plate spring sheet is fixedly connected to the bracket via the adapter assembly.

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.

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.

A linear actuator or motor for oscillating a blade is provided. The linear actuator replaces an eccentric drive and yoke, resulting in a linear powered drive to oscillate the blade linearly. This operation facilitates the formation of a smaller and/or lighter hair clipper. The linear actuator uses alternating current to oscillate a permanent against a biasing force produced by a set of springs. The permanent magnet is located opposite a stator with an electromagnetic coil that generates an electromagnetic force to oscillate the permanent magnet.

The present disclosure provides an electric shaver, including a handle, and a driving device and a hair cutting unit; the driving device includes a motor housing, and a base, a mover component, a stator component, an elastic suspension component, and an elastic support that are disposed in the motor housing; the stator component is fixedly arranged on the base; an end of the elastic suspension component is fixedly connected to the base, and the other end is fixedly connected to the mover component; the base is suspended and connected to the motor housing through the elastic support; the stator component drives the mover component to move reciprocally in a predetermined direction; the mover component is connected to the hair cutting unit; the handle includes a bracket body and a vibration damping device; the vibration damping device includes a vibration damping oscillator and a cushioning mechanism.

A hair cutting device includes an installation frame including electromagnet installation and magnet group installation parts, an electromagnet is disposed horizontally in the electromagnet installation part, a magnet group is disposed in the magnet group installation part, and the magnet group is positioned opposite to a magnet pole of the electromagnet. When alternating current is flowed through the electromagnet, a magnetic induction action between the electromagnet and the magnet group causes the magnet group to reciprocate along a direction perpendicular to a central axis of the electromagnet. By arranging the electromagnet horizontally and placing the magnet group on a side of the electromagnet, a horizontal space can be fully utilized, which significantly reduces a height of the linear actuating device and a length of products with the linear actuating device, thereby coordinating a proportion of the product in length and horizontal directions, and enhancing the beauty of the products' appearance.

A linear actuator includes: at least one electromagnet arranged horizontally and magnet groups disposed at two sides of the electromagnet separately. Each electromagnet includes two magnetic poles, and the two magnetic poles are arranged at two ends of the electromagnet along an axial direction thereof. Each magnet group is opposite to the magnetic poles on sides of the electromagnet correspondingly, each magnet group includes at least two magnets, a side of a part of the magnets facing the electromagnet is S pole, and a side of another part of the magnets facing the electromagnet is N pole. After energizing the electromagnet, the magnet groups are driven to reciprocate along a direction perpendicular to a central axis of the electromagnet through magnetic induction action between the electromagnet and the magnet groups. A volume of the linear actuator can be reduced by the above structure.