458results about "Electromagnet circuit arrangements" patented technology

Methods for treating a patient using time varying magnetic field are described. The treatment methods combine various approaches for aesthetic treatment. The methods are focused on enhancing a visual appearance of the patient.

A method and circuit for controlling current through an inductive load such as an electromagnetic valve of a vehicle anti-lock braking system includes first and second driver stages, controlled by PWM (pulse width modulation) signals, for providing, respectively, an actuation path for valve current in an “on” phase and a recirculation path for valve current in an “off” phase. A peak value of current flowing in the actuation path at the end of an “on” phase is compared with a peak value of current flowing in the recirculation path at the start of the “off” phase in order to detect any malfunction of the circuit. An embodiment of the invention has the advantage of being able to detect any malfunction at very low and very high PWM duty cycles.

Embodiments provide a lens driving unit including a base, a housing supported so as to be movable relative to the base, a magnet located on the housing, a pattern coil part including a pattern coil that is located opposite the magnet, the pattern coil part being located on the base, and a sensor part mounted to the pattern coil part for sensing a position or movement of the housing, and the pattern coil part includes a first layer and a second layer stacked on the first layer, the sensor part being mounted underneath the first layer, and the pattern coil being formed on the second layer. Thereby, manufacturing costs may be reduced owing to a reduction in the number of elements, processes, and process management points.

A sensor arrangement for measuring a rotor position of an electric motor, in particular of a motor vehicle control device, wherein the sensor arrangement is constructed as a sensor arrangement operating without contact, which includes at least one permanent magnet and at least one magnetic field sensor, wherein the permanent magnet has at least one depression in at least one top surface facing the magnetic field sensor. A magnetization device for magnetizing a permanent magnet of the sensor arrangement is also disclosed. The use of the sensor arrangement in a motor vehicle control device of a braking system of a motor vehicle is also disclosed.

The invention relates to a functional component, a method for controlling a functional component and a terminal, belonging to the field of mobile devices. The functional module includes a magnetic moving structure and a functional module. The magnetic moving structure includes a fixed part, a moving part and a magnetic part. The moving part is used for moving along a specified trajectory on the fixed part, and is connected with the functional module. The magnetic part includes a first magnet arranged on the fixed part and a second magnet arranged on the moving part, wherein one of the first magnet and the second magnet is an electromagnet, and the other is a magnet. According to the invention, the moving part to which the functional module is fixed is enabled to move along a specified trajectory on the fixed part through the magnetic part consisting of an electromagnet and a magnet, and thus, can drive the functional module to move. The problem in the related technology that it may bedifficult for the functional module to move normally after long-time use is solved. In the invention, the functional module can still move normally after long-time use.

The invention discloses an inductive magnetic-electric biochemical reaction system. The inductive magnetic-electric biochemical reaction system comprises a reaction unit, a primary coil, a secondary coil, a rotating magnetic field unit and a control unit, wherein the reaction unit comprises a reaction cavity which comprises a reactant container, and the reaction cavity is arranged in a rotatable radial magnetic field; the primary coil is wound on one side of a closed iron core and is connected with the control unit; the secondary coil is wound on the other side of the closed iron core, the secondary coil comprises an insulated pipeline (such as a glass spring) which can be used for flowing of a reaction solution which is used as a conductor, and the two ends of the insulated pipeline are communicated with the reactant container; the rotating magnetic field unit is used for generating the rotatable radial magnetic field; and the control unit is at least used for adjusting excitation voltage and signal types applied to the primary coil. The application fields of the biochemical reaction system comprise auxiliary acid hydrolysis and enzyme hydrolysis of natural polymer raw materials, auxiliary extraction of modified or natural products, as well as induction and affection to biochemical reaction.

In the dither current power supply control method, in order to prevent occurrence of a difference between the target average current and the detected average current, which is caused when a medium current (I0) between a dither large current (I2) and a dither small current (I1) and a waveform average (Ia) of the dither current are different from each other depending on a response time difference (a−b) between a rise time (b) and a fall time (a) of the dither current, negative feedback control is carried out by using a command medium current corresponding to the target average current corrected by a correction parameter based on experimentally measured data, thereby suppressing occurrence of a transient fluctuation error by the negative feedback control, so that a highly precise and stable load current is acquired.

The invention provides a random-direction dynamic vector uniform magnetic field generating device and a control system, and relates to the technical fields of magnetic field generation and control andrelated magnetism testing engineering. The device comprises three groups of orthogonally-placed Helmholtz coils, a non-magnetic structural component and a three-channel current source. The three groups of Helmholtz coils are respectively wound around the X-axis, Y-axis and Z-axis of a space coordinate system, wherein the X-axis, the Y-axis, and the Z-axis are taken as the axes. Each Helmholtz coil comprises two enamelled copper coils which are coaxially wound clockwise in series, wherein the axial spacing of the two enamelled copper coils of the same group is the same as the radius of the enamelled copper coils. A uniform magnetic field in any direction and with adjustable size and variable timing sequence can be generated in the space near the geometric center of the device, thereby effectively solving a problem of the urgent need for uniformity, time-varying, directionality and high precision of the magnetic field.

Bi-stable permanent magnet actuation is a technique employed to move and magnetically hold an armature in electromechanical devices including some valves, wherein, permanent magnets are employed in a manner that places their magnetic field in a bi-stable state to allow a control coil to divert the permanent magnet's magnetic field in one of two directions within the surrounding magnetic material. Control is established using an actuation system comprising, a power source to deliver the desired level of energy, a voltage conditioner such as a DC/DC converter matched to the power source and electromechanical device, an energy storage device such as a capacitor, an output circuit such as an H-Bridge switching circuit, and a control circuit for controlling delivery of short duration current pulses from the energy storage device through the output circuit to the electromechanical device's control coil. Thus, an energy efficient bi-stable permanent magnet actuation system is produced.

An audio speaker including a bobbin-less voice coil having epoxy-bound winding layers is disclosed. More particularly, a voice coil may include a first winding layer and a second winding layer coaxially arranged about a central axis. The winding layers may include respective wire turns coiled about the central axis in a longitudinal direction. The winding layers may be bound by an epoxy matrix. For example, the epoxy matrix may be disposed radially between the first winding layer and the second winding layer to bond first wire turns to second wire turns, and to bond the winding layers to a speaker diaphragm.

The present invention concerns an electromagnetic actuator for a haptic display. The actuator comprises: a) a first, movable permanent magnetic element, the first magnetic element comprising a first latching layer facing side, a second latching layer facing side substantially opposite to the first latching layer facing side, and at least one lateral face between the first latching layer facing side and the second latching layer facing side; b) a shielding element for shielding laterally the first magnetic element to confine a magnetic field generated by the first magnetic element; c) a first actuation inductor facing the first latching layer facing side for actuating the first magnetic element and arranged to displace the first magnetic element from a first latching position to a second latching position, or vice versa; d) a first latching layer facing the first latching layer facing side and arranged to attract the first magnetic element for obtaining the first latching position; and e) a second latching layer facing the second latching layer facing side and arranged to attract the first magnetic element for obtaining the second latching position, different from the first latching position.

A head covering garment is configured to administer electromagnetic therapy to treat a cancerous tumor within a brain. The head covering garment includes a crown, which contains within its walls at least two magnetic coils (also referred to herein as solenoid coils). Each solenoid coil is energized, when in therapeutic operation, with a distinct time-domain signal. The time-domain signal consists of a series of summed sinusoidal waves from a power supply. The coils are oriented within the wall of the solenoid assembly such that for any two coils a first magnetic coil and a second magnetic coil are oriented relative to each other so as to be nonparallel. The purpose of having two distinct coils is to focus resultant magnetic fields such that at a tumor site within the brain encloses to form a local maximum formed by superposition within the cancerous tumor.

According to one aspect of the present invention, there is provided an imaging lens including: an image shake correcting action unit provided movably in a direction perpendicular to an optical axis of the lens; a stationary unit for supporting the image shake correcting action unit; a permanent magnet provided on one of the image shake correcting action unit and the stationary unit and a coil provided on an other; a drive circuit for moving the image shake correcting action unit relative to the stationary unit; a mount section for being connected to an imaging unit; and a conductive member which is nonmagnetically conductive and disposed between the coil and the mount section so as to include a facing surface facing a surface formed by a winding wire of the coil and having a larger area than a surface formed by an inner periphery of the coil.

A method for controlling a controllable acoustic valve of a hearing device. The valve includes a moveable valve element adapted to be positioned in one of at least two essentially stable states. The moveable valve element is configured to be maintained in each of the essentially stable states by a retention force. A neutral point with essentially cancelling retention forces exists between the least two essentially stable states. The method includes providing a first drive signal to the controllable acoustic valve to overcome a retention force of a first essentially stable state in order to initiate movement of the moveable valve element from the first essentially stable state to a second essentially stable state. The provided first drive signal is capable of bringing the moveable valve element from the first essentially stable state and beyond a neutral point between the first and second essentially stable states.

A magnetic substance holding device includes: a first pole piece assembly including a first N-pole piece, a first S-pole piece, and a first permanent magnet; a second pole piece assembly including a second N-pole piece, a second S-pole piece, and a second permanent magnet; at least one first coil; at least one second coil; and a control device controlling current applied to the first coil and the second coil so as to control magnetic fluxes passing through the first coil and the second coil, thereby allowing the first pole piece assembly and the second pole piece assembly to switch between the first arrangement and the second arrangement, to control magnetic fluxes passing through the holding faces of the first pole piece assembly and the second pole piece assembly.

A video probe is disclosed herein that includes an elongated probe including an articulating portion, and a controller functionally coupled with the elongated probe. The articulating portion may include at least two interconnected links and each link may include opposing electromagnetic coils disposed within the link. The controller may be configured to stimulate the opposing electromagnetic coils to attract/repulse corresponding opposing electromagnetic coils of an adjoining link thereby causing the link to pivot about the axis of the single-axis joint.

A switching valve has a cylinder, an end port, a side wall port, a sliding core, a poppet seal, a biasing member, and a sliding core internal channel. The cylinder guides the sliding core in a slidable manner, and has a valve seat. The poppet seal guided in a slidable manner in a sliding core inner space is biased toward a seal engagement protrusion by the biasing member. The poppet seal can be seated on the valve seat by a biasing force given by the biasing member to close a channel for controlled fluid, and can be separated from the valve seat to open the channel for the controlled fluid.