Solenoid

About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.

Pulse width modulation control for valves

Abstract: A control circuit for a fluid controller such as a solenoid driven valve. A pulse output system operating at a fixed or variable frequency, with pulse width varying as a function of error signal. An integrator for integrating the error signal and providing an input to a threshold trigger circuit, and a multivibrator for periodically grounding the integrator output.

Electronic lock in cylinder of standard lock

Abstract: An electronic security system includes an electronic lock mechanism and an electronic key, each of which is provided with a microprocessor controller and a memory storing data including an ID code and encryption key codes. The lock microprocessor may either change ID codes stored in its memory or encrypt a seed number to be used for determining access to the lock. The key can only be used to access the lock either once or for a limited number of successive times, and must thereafter be reprogammed by a host computer to be loaded with either the proper ID code or the appropriate encryption key code for that lock. An electornic lock security system preferably includes an electronic lock including a hollow cylinder, an opening into the cylinder, a bolt movable through the opening between an extended position and a retracted position, a cam member within the cylinder, the cam member contacting the bolt to move the bolt to an unlocked position, a solenoid within the hollow cylinder, the solenoid being engageable with the cam member, an electronic lock circuit within the hollow cylinder, a plug connected to the solenoid for rotating the solenoid, the plug having a keyway for insertion of key means for rotating the plug. In addition, the system also includes a key means insertable within the keyway and having electronic means for communicating with the electronic lock circuit to operate the lock. The solenoid is a novel torque transmitting solenoid that can also be used in a variety of other environments.

Solenoid operated electric strike

Abstract: An electric strike with a pivotally mounted catch which is locked by a pivotally mounted detent engageable with a pivotally mounted detent arm controlled by the catch, movement of the detent being controlled by an electrically energizable solenoid and moveable core assembly which has a portion of the core extending outwardly of the solenoid, the core being pivotally interconnected with the detent and said portion of the core moving inwardly of the solenoid upon energization of the latter The detent arm may be omitted and the detent may, in such case, engage a pin carried by the catch

D.C. Electromagnetic actuator

Abstract: An actuator driven by D.C. power suitable for use in actuating automobile door locking device. The actuator has a yoke apparatus defining a space, two annular solenoid coils supported and received by the yoke apparatus and adapted to be energized simultaneously such that poles of the same polarity appear at the adjacent ends of the coils, and moving means reciprocatably disposed in the space of the yoke apparatus. The moving means includes an axially magnetized permanent magnet carried by a shaft and a pair of magnetic members attached to both axial ends of the permanent magnet.

System for control of an electromagnetic actuator

Abstract: A system for controlling the force and/or motion of an electromagnetic actuator (L1). The actuator (L1) could be a solenoid, relay, or levitating device. The drive (T1) to the coil (L1) can be linear or switching, voltage or current and the sensors (S1) measuring the system can be as simple as just a current sensor monitoring the coil current or a flux sensor. Continuous control of position can be achieved allowing magnetic levitation or the soft landing of the moving element.