251results about "Electromagnet circuit arrangements" patented technology

A driving method of a transcranial magnetic stimulation 3D coil device is disclosed, which includes: determining first and second signal peaks corresponding to a specified rotating magnetic field direction, in which the first and second signal peaks respectively correspond to first and second coils in multiple coils; providing a first pulse current having the first signal peak to the first coil, in which the first pulse current signal stimulates the first coil to provide a first magnetic field; providing a second pulse current signal having a second signal peak to the second coil, in which the second pulse current signal stimulates the second coil to provide a second magnetic field, in which the first magnetic field and the second magnetic field form a rotating magnetic field having the specified rotating magnetic field direction.

A control unit (1) with integrated energy conditioning and integrated energy management for controlling an electrically operated and / or controlled actuator (2) is proposed, comprising: a controller unit (4) for generating a control signal for the actuator (2); a connection (AC) for connecting the control unit (1) to an external electrical power supply providing a mains voltage (VAC0); a circuit arrangement (8) for conditioning, rectifying, and converting the mains voltage (VAC0) into a first DC link voltage (VCC1), wherein the level of the first DC link voltage (VCC1) is independent of the level of the mains voltage (VAC0);at least one electrical intermediate storage device (7) for the first DC link voltage (VCC1) to buffer a necessary power for maintaining at least one further voltage derived from the first DC link voltage (VCC2, VCC3) to supply the controller unit (4) in the event of failure of the external electrical power supply and for transferring the actuator (2) into a safe state, for example in the event of failure of the external electrical power supply.

A circuit includes an amplifier having a first input, a reference input, and an output. A pulse width modulator (PWM) controller has an input coupled to the output of the amplifier. A first switch has a control terminal coupled to an output of the PWM controller. A second switch has a second terminal coupled to the second terminal of the first switch, and has a control terminal coupled to the output of the PWM controller. An input of a current sensor is coupled to the second terminal of the first switch and is coupled to a second terminal of the second switch. An output of the current sensor is coupled to the first input of the amplifier. A duty cycle monitoring and reference signal adjustment circuit has an input coupled to the output of the PWM controller and has an output coupled to the reference input of the amplifier.

Electromechanical lock and method are disclosed. The lock includes: a movable permanent magnet to move between a first position and a second position; a stationary permanent semi-hard magnet; and an electrically powered magnetization coil positioned adjacent to the stationary permanent semi-hard magnet to switch a polarity of the stationary permanent semi-hard magnet between a first magnetization configuration and a second magnetization configuration. The first magnetization configuration of the stationary permanent semi-hard magnet moves the movable permanent magnet to the first position. The second magnetization configuration of the stationary permanent semi-hard magnet moves the movable permanent magnet to the second position. A magnetic axis of the movable permanent magnet is side by side with a magnetic axis of the stationary permanent semi-hard magnet.

A permanent electromagnetic holder 1 is provided with: a first magnet 3 that has a relatively small coercive force; a ring-shaped second magnet 4 that is a rare-earth magnet having a relatively large coercive force; and a coil 5 for magnetizing the first magnet through energization thereof. The first magnet 3 is configured such that the magnetic pole surfaces of different magnetic poles are oriented in the thrust direction of an axial center α, the second magnet 4 is configured such that the magnetic pole surfaces of different magnetic poles are oriented in the thrust direction of an axial center α, and the second magnet 4 is disposed outside the first magnet in the radial direction of the axial center α. The first magnet 3, the second magnet 4, and the coil 5 are arranged so as to overlap in the radial direction of the axial center α, and an operation of switching an adsorption ON / OFF state is carried out by switching the magnetizing direction of the first magnet 3 through energization of the coil 5 when the adsorption ON / OFF state is switched.

A solenoid system and method can include: providing an energizing voltage to a coil of a solenoid; providing an AC signal superimposed onto the energizing voltage; detecting current through the coil including an AC current amplitude induced by the AC signal and including a DC offset current amplitude; determining the AC current amplitude is a low AC current amplitude based on an armature within the solenoid being in a retracted position or determining the AC current amplitude is a high AC current amplitude based on the armature being in an extended position with the control logic, and where the AC current amplitude is determined utilizing the AC signal for synchronous demodulation; and determining a temperature fault based on the DC offset current amplitude falling below a DC offset current amplitude threshold.

Some embodiments provide an irrigation controller comprising: a signal generator configured to receive a DC voltage and comprising sets of switching elements, wherein one set of the sets of switching elements corresponds to a common line output of the irrigation controller and remaining sets of switching elements correspond to station outputs of the irrigation controller, wherein each set of switching elements is configured to generate an output alternating waveform signal; and a control circuit configured to: output sets of control signals to the sets of switching elements, each set of control signals drives a respective set of switching elements to control characteristics of a respective output alternating waveform signal to be generated by the respective set of switching elements; and control an application of the output alternating waveform signals to a respective common line output connector and respective station output connectors.

This patent document provides optical shutter devices based on electromagnetically activated shutters using a printed circuit board (“PCB”) structure to provide a coil that generates a magnetic field to move a permanent magnet in and out of an optical aperture integrated as part of the PCB structure to open and close the passage of light through the optical aperture.

A magnetic actuator having an actuator element, a coil for actuating the actuator element, and a circuit for energizing the coil, the circuit having a supply voltage input to which a supply voltage for energizing the coil is applicable, and the circuit being configured to provide a clocked energization of the coil in a holding current reduction phase and to adapt a duty cycle of the clocked energization as a function of the supply voltage.

The present invention relates to the field of motor control, and discloses a controller for charging and demagnetizing an electric permanent magnetic chuck for a manipulator, comprising a switching power supply module, a rectifier filter module, a main control module, a drive module, an IGBT module, an output circuit, a protection control module, a Hall sensor, and an external control module; the rectifier filter module, the switching power supply module, the main control module, the drive module, and the IGBT module are connected in sequence, the main control module is connected to the Hall sensor through the protection control module, the main control module is also connected to the external control module, and the IGBT module is connected to the electric permanent magnetic chuck for a manipulator through the output circuit. The present invention can monitor the change of output voltage or current in real time and adjust it to achieve the change of the magnetic force of the chuck to control the electric permanent magnetic chuck for a manipulator by changing the circuit control form, so that the output magnetic force of the electric permanent magnetic chuck is stable and reliable, and is used to solve the problem that the controller cannot monitor the change of the magnetic force of the chuck and the conversion speed in real time.

Example embodiments are directed a magnetic field generation device including an array of electromagnets including a plurality of electromagnets, and a current controller configured to generate a plurality of current waveforms and to apply each current waveform to a respective one of the plurality of electromagnets. The current controller is further configured to control a pulse duty cycle of each of the plurality of current waveforms. The magnetic field generation device also includes a magnetic field controller configured to calculate each of the plurality of current waveforms to be provided to the respective one of the plurality of electromagnets to generate a desired magnetic field distribution. The plurality of electromagnets include a central electromagnet, and peripheral electromagnets having symmetry in an azimuth direction and arranged about the central electromagnet. Each electromagnet includes a magnetic core and a coil, and a yoke magnetically couples the electromagnets to each other.

To prevent liquid sloshing caused by switching a coil to be energized in a transport device. A transport device that transports an object to be transported provided with a magnetic body, the transport device includes: a plurality of coils configured to generate a thrust for transporting the object to be transported; a coil drive unit configured to apply a pulsed voltage to each of the plurality of coils; and a calculation unit. When switching a coil to be energized, the calculation unit determines a width of the pulsed voltage such that a speed or an acceleration of the object to be transported is stabilized based on a position of the object to be transported and a time at which the object to be transported passes through the position or a current flowing through an energized coil in a predetermined period before switching the coil to be energized, and outputs the determined width to the coil drive unit.

The present disclosure provides a control circuit and a control method of a bistable permanent magnet mechanism. The control circuit includes five switches, a diode and a control unit for controlling the five switches to be turned on and turned off. The control circuit enables the positive and the negative of the current passing through the coil to be adjustable at any time and avoids load breaking, without a complicated design of a driving circuit, thereby reducing the cost. It can also realize PWM control, adapt to a larger current range and different bistable permanent magnet mechanisms, and has a wide range of application scenarios.

The present invention relates to a system and method to control an electric door lock based on a current pulse generator and a switched mode current source with load-dependent output which allows to reduce the size of the installation and the energy needed for the opening / closing of the door and offers the possibility of implementing a rechargeable battery as back up. To do so, the system and method generates 2 sequential current signals after receiving a trigger, wherein one of the signals is a current peak signal with short time duration and the other one a lower but longer in time current signal.

A method, comprising: applying a magnetic field to a magnetizable substrate sheet, the magnetizable substrate sheet comprising a first rotatable element, the magnetic field rotating the first rotatable element as to convert the magnetizable substate sheet to a second configuration in which second configuration the first rotatable element magnetically affixes to a second element of the magnetizable substrate sheet. A component, comprising: a plurality of articulable segments arranged circumferentially so as to define a first collapsable frustum and a second collapsable frustrum, the first collapsable frustum and the second collapsable frustum extending away from their respective bases and converging toward one another, the first collapsable and second collapsable frustum converging at a plane and the component defining therein an opening at the plane, the component configured such that the first and second collapsable frustrum are collapsable toward one another so as to attain one or more stable collapse states.

The claimed invention relates to a linear actuator comprising one or more coils configured to generate a first magnetic field, and a plunger comprising a magnet. The plunger is acted upon by the first magnetic field and is configured to produce a second magnetic field. The second magnetic field is a non-uniform magnetic field. The claimed invention also relates to a method of operating a linear actuator.

A system in a vehicle includes a panel configured cover a portion of the vehicle through which a port extends and one or more electro permanent magnets arranged on the portion of the vehicle. The system also includes a controller to magnetize the one or more electro permanent magnets based on applying a current of a first polarity to the one or more electro permanent magnets such that the one or more electro permanent magnets on the portion of the vehicle couple to the panel, the panel being metal, or to one or more permanent magnets on a surface of the panel to lock the panel when the panel is in the closed position.

A magnetic field generation module is disclosed. The magnetic field generation module comprises: a main core; at least two auxiliary cores positioned in the vicinity of and around the main core; auxiliary coils wound on respective auxiliary cores; and a power source unit for applying a current to the auxiliary coils.

Provided is an external magnetization system using multiple solenoid modules with a Halbach array. The external magnetization system comprises a support frame; a magnetization device including multiple solenoid modules arranged in a predetermined direction by a Halbach array along the support frame, and generating a plurality of magnetic lines in a predetermined direction for cross-sectional magnetization of a prestressed (PS) steel in a prestressed concrete (PC) member; a detection device measuring changes in a magnetic flux density associated with the plurality of magnetic lines; and A control device controlling the magnetization device in conjunction with the detection device.

Provided is a control device controlling an electromagnetic actuator that drives an operation device, supported in an elastically vibratable manner by an elastic support part, in one direction of a vibration direction of the operation device to vibrate. The control device includes a circuit that applies a main driving signal to a coil of the electromagnetic actuator to start vibration of the operation device in response to a touch operation on the operation device, then applies a sub-driving signal to the coil to adjust an attenuation period of the vibration. The sub-driving signal has a variable voltage varying with an offset voltage, as a center value, offset from a zero voltage, and a waveform that indicates a variation in the variable voltage is a sine function curve or a cosine function curve. The circuit applies the sub-driving signal while changing the offset voltage for each cycle.

The magnetic coupling device may include a movable pole piece that may be retractable along a first direction and may be locked in position.

To provide an apparatus and a method for attracting ferrous objects with a programmable permanent electromagnet array.SOLUTION: A permanent electromagnet array 300 includes one or more of a plurality of parallel-arranged permanent electromagnets 140A, 140B having a common length and a planar pole piece 234 coupled to a first end of the plurality of permanent electromagnets, each of which includes a first end and a second end opposite the first end.SELECTED DRAWING: Figure 3A

A method for a power system is disclosed. The method includes receiving signals, activating switches to pass a current from a power source to an apparatus. The method also includes deactivating switches and bypassing the power source. The power source may be a photovoltaic power source. The signals may be power line communication (PLC) signals.

A magnetic stimulation device, method of operating the magnetic stimulation device and methods of use are described. The magnetic stimulation device reaches high repetition rates and / or high values of magnetic flux density. The magnetic stimulation device provides various treatments at the same time and a plurality of treatment effects are achieved.

To prevent liquid sloshing caused by switching a coil to be energized in a transport device. A transport device that transports an object to be transported provided with a magnetic body, the transport device includes: a plurality of coils configured to generate a thrust for transporting the object to be transported; a coil drive unit configured to apply a pulsed voltage to each of the plurality of coils; and a calculation unit. When switching a coil to be energized, the calculation unit determines a width of the pulsed voltage such that a speed or an acceleration of the object to be transported is stabilized based on a position of the object to be transported and a time at which the object to be transported passes through the position or a current flowing through an energized coil in a predetermined period before switching the coil to be energized, and outputs the determined width to the coil drive unit.

Provided is a control device controlling an electromagnetic actuator that drives an operation device, supported in an elastically vibratable manner by an elastic support part, in one direction of a vibration direction of the operation device to vibrate. The control device includes a circuit that applies a main driving signal to a coil of the electromagnetic actuator to start vibration of the operation device in response to a touch operation on the operation device, then applies a sub-driving signal to the coil to adjust an attenuation period of the vibration. The sub-driving signal has a variable voltage varying with an offset voltage, as a center value, offset from a zero voltage, and a waveform that indicates a variation in the variable voltage is a sine function curve or a cosine function curve. The circuit applies the sub-driving signal while changing the offset voltage for each cycle.

The present invention provides a method and a corresponding device for controlling a micro-nanorobot cluster, which adopts a driving method based on a rotating gradient magnetic field to drive a micro-nanorobot cluster with magnetic components as a carrier for precise drug or cell delivery. The present invention uses a plurality of electromagnetic coils driven by a programmable timing electrical signal, which can generate an equivalent centripetal force pointing to the target position in the working space area, thereby attracting the micro-cluster to converge from different directions to the target position including the diseased tissue. By changing the current input of the electromagnetic coil, the coordinates of the target position can be adjusted.

Method of poling a ferroelectric medium applies a first contact surface of a first electrical contact to a first side surface section, the first contact surface smaller than the first side surface section, and applies a second contact surface of a second electrical contact to a second side surface, the second contact surface covering at least the second side surface section, and applies an electrical voltage between the first and second electrical contacts. Relative movement between the first contact surface and the ferroelectric medium in two mutually perpendicular directions sweeps the first contact surface over the first side surface section and a measure of a current flowing between the first electrical contact and the second electrical contact through the ferroelectric medium is detected and the electrical voltage controlled so that a deviation of the current from a nominal poling current is minimised. The second electrical contact is an ionic conductor.

To provide an improved method for operating a multi-frequency metal detector and an improved multi-frequency metal detector to be operated according to this method.SOLUTION: A metal detector (1) comprises: a drive coil (L61) for producing an electromagnetic field in a product; at least one detection coil (L62, L63) arranged to detect fluctuations in the magnetic field caused by metallic particles present in the product; and a multifrequency transmitter unit (10) comprising a converter (4) with a plurality of drive switches (S41, S42; S43, S44). The plurality of drive switches (S41, S42; S43, S44) is driven by a drive controller (2) according to operating instructions such that the drive switches (S41, S42; S43, S44) alternately conduct a drive current (iD) through the drive coil (L61) so that the generated electromagnetic field exhibits two or more different frequency components (fD1, fD2).SELECTED DRAWING: Figure 1a

An apparatus comprising a signal transformer coupled to a power line and a signal transmission, reception, or detection circuit. A sensor is configured to be responsive to the power line current or magnetic flux generated in a ferrite core of the signal transformer. When the sensor indicates that the flux generated by the power line current mat cause an attenuation of the signal strength, a second circuit generates a current through a flux cancelling winding that cancels at least some of the flux generated by the power line current.