13results about "Electromagnet circuit arrangements" patented technology

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 control device (1) for controlling an RMS value of an electrical load current (5) at a time-varying load (2), characterized in that the control device (1) is configured to provide a voltage pulse train (4) having a predetermined duty cycle (10) at the time-varying load (2) and in at least one pulse phase (8) of the voltage pulse train (4): - to detect a respective sample value (16) of the electrical load current at the time-varying load (2), wherein the control device (1) is configured to detect the sample value (16) of the electrical load current in a last tenth of the pulse phase (8) and / or during a falling signal edge of a pulse of the voltage pulse train (4), - to determine an actual RMS value (11) of the electrical load current assigned for the sample value (16) of the electrical load current by means of a dependency (17) stored in the control device (1).- to determine a difference value (25) between the actual RMS value (11) of the electrical load current and a target RMS value (6) of the electrical load current, - to determine an adapted duty cycle (26) of the voltage pulse train from the difference value (25) of the electrical load current according to a predetermined procedure, and - to provide an adapted voltage pulse train (27), having the adapted duty cycle (26), to the time-varying load (2).

An electropermanent magnet array is provided. The electropermanent magnet array includes one or more of a plurality of electropermanent magnets of common length, arranged in a parallel fashion, and a planar pole piece, coupled to the first ends of the plurality of electropermanent magnets. Each electropermanent magnet includes a first and a second end opposite the first end.

A circuit breaker includes a microcontroller, a voltage feedback circuit, and a power supply circuit electrically couplable to a power input, and including a switch and a solenoid. The power supply circuit is configured to activate the switch and electrically couple to the power input in response to a gate trigger signal, and to provide current to the one or more solenoids in response to a solenoid signal. The microcontroller is configured to issue, to the power supply circuit, the gate trigger signal for the power supply circuit to electrically couple at a first duty cycle, and the solenoid signal based on receiving a first indication from the voltage feedback circuit of a first voltage; receive, during the extension of the one or more solenoids, a second indication of a second voltage; and in response to the second indication, increase the first duty cycle to a second duty cycle.

The actuator device according to the present embodiment comprises: a holder; a reflective member disposed on the holder; a rigid mover coupled to the holder; a first magnet disposed on the rigid mover; a second magnet generating a repulsive force with the first magnet; and a first driving magnet for tilting the holder, wherein the first driving magnet comprises a first surface in a direction directing toward the reflective member, wherein the second magnet comprises a first surface in a direction directing toward the reflective member, wherein the first surface of the first driving magnet comprises a first region that is the most adjacent to the second magnet, and wherein a first region of the first driving magnet having a polarity different from that of the first surface of the second magnet.

A novel and useful solid-state degauss circuit for use with electromagnetic door locks. The door lock circuit is configured to provide a current to the electromagnetic coil load. A pulse width modulation (PWM) controller varies the frequency and / or duty cycle to a switch in series with the coil. An active, solid-state degauss circuit in line with the current flowing through the coil is provided. When triggered either in an uncontrolled or controlled manner, the active degauss circuit composed of a solid-state device, creates a short circuit across the coil after current reversal is achieved thereby degaussing.

A coil unit and an electric valve are disclosed. The coil unit (100) includes a control box (1). The control box (1) includes a first housing part (11) and a second housing part (12) that are fixedly connected. The second housing part (12) includes an insertion port part (122) and a first connection member (121). The insertion port part (122) has a second chamber (1221). The first connection member (121) has a first end part (1211) and a second end part (1212). A part of the first end part (1211) is located in the first chamber (13), and a part of the second end part (1212) is located in the second chamber (1221). The first end part (1211) is connected to be crimped to the electronic control board (3). The first connection member (121) can be electrically connected and / or signal-connected to the electronic control board (3). By arranging it in this way, the installation of the coil unit is simplified. Also, when it is necessary to replace the number of the first connection members (121), it is not necessary to re-develop the entire coil unit, the development cost of the coil unit can be reduced, and further, the development cost of the electric valve can be reduced.

In certain embodiments, a method of controlling a solenoid including an armature and a coil includes initiating, by a control system in electrical communication with the coil, movement of the armature by applying a first commanded electrical current to the coil. The method also includes, after the initiating, generating, by the control system, current fluctuations to vary a rate of change of current through the coil. The method also includes estimating, by the control system, a position of the armature based on the rate of change of current through the coil.

An apparatus includes a power converter to convert incoming alternating current (AC) mains power into a direct current (DC) voltage. A linear AC pump of the apparatus has an arm that reciprocates linearly back and forth to move a pair of diaphragms to pressurize air that is output from the linear AC pump. The apparatus also includes a DC motor driver having an H-bridge that receives the DC voltage from the power converter as an input and that generates a square wave as an output that is coupled to the linear AC pump to drive the arm back and forth. The pressurized air from the linear AC pump is used to inflate one or more bladders of an air mattress, for example.

Disclosed are a solenoid actuator and a multi-stage solenoid actuator for transmitting a constant force. The solenoid actuator includes a tubular solenoid, a power unit capable of applying current to the solenoid, and a magnetic pair member having two magnetic members providing magnetic fields formed such that respective first poles thereof face each other and respective second poles thereof different from the first poles are located at both distal ends, and extending through the tub of the solenoid. The multi-stage solenoid actuator includes a solenoid assembly where at least two tubular solenoids are regularly aligned such that inner spaces of the tubes of the solenoids are arranged in series, a power unit capable of individually applying current to each solenoid of the solenoid assembly, at least one magnetic pair moveable unit having two magnetic members providing magnetic fields formed such that respective first poles thereof face each other and respective second poles thereof different from the first poles are located at both distal ends, and extending through the tub of the solenoid assembly, and a controller for determining and controlling a solenoid to receive the current from the power unit depending on a position of the magnetic pair moveable unit.

A method of operating a solenoid valve can include applying power to a coil of the solenoid valve, interrupting power to the coil upon a first increase in power consumption of the coil, detecting a first on-time when power is applied to the coil, re-applying power to the coil upon a first condition becoming satisfied, interrupting power to the coil upon a second increase in power consumption of the coil, detecting a second on-time when power is re-applied to the coil, comparing the first on-time with the second on-time, and detecting when an armature of the solenoid valve has physically shifted based at least in part on the comparing. Detecting when the armature of the solenoid valve has physically shifted can include determining that the second on-time is greater than the first on-time.

In an apparatus for zeroing a magnetic field in a zeroing region in an external surrounding magnetic field, a plurality of separate magnetic field generating elements 102 are arranged at respective separate locations surrounding the zeroing region to generate respective zeroing magnetic fields extending into the zeroing region. A plurality of magnetic field sensing elements 103 are arranged at respective separate locations within the zeroing region to sense respective values ​​of the magnetic field in the zeroing region. A feedback control unit 150 controls the value of the respective zeroing magnetic field generated by each of the plurality of magnetic field generating elements by driving the magnetic field generating elements with respective currents that reduce the value of the magnetic field detected by each magnetic field sensing element to a value not exceeding a preset threshold corresponding to a preset zeroing of the magnetic field in the zeroing region in response to the value of the magnetic field sensed by the plurality of magnetic field sensing elements.

This disclosure provides a vibration actuator for use with wearable electronic devices. The vibration actuator includes a ferrite material plate positioned between two magnetic material plates, and a conductive coil positioned around the ferrite material plate and electrically insulated. These three material plates and the coil are housed in a shell that protects and structurally supports the components of the vibration actuator, so that no adhesive or any other intervening material is required between the ferrite material plate and the two magnetic material plates. In response to a control voltage applied to the conductive coil that generates an electromagnetic field, a desired electromechanical response is induced in at least one of the material plates, such as a vibration pattern over a predetermined duration at a predetermined frequency, beat, and / or intensity.