42results about "Magnetic field change switches" patented technology

A magnetically-triggered proximity switch includes a cylindrical switch body and a bias member non-movably secured within the switch body. The proximity switch also includes first and second normally-closed contacts and first and second normally-open contacts. The proximity switch further includes a spherical contact magnet disposed within the switch body, with the contact magnet being movable relative to the bias member from a first switch position and a second switch position. In the first switch position, an attraction to the bias member maintains the contact magnet in contact with the first and second normally-closed contacts, thereby completing a circuit between the first and second normally-closed contacts. In the second switch position, an attraction to a movable target external to the switch body moves the contact magnet into contact with the first and second normally-open contacts, thereby completing a circuit between the first and second normally-open contacts.

A magnetically-triggered proximity switch includes a cylindrical switch body and a first magnet non-movably secured within the switch body. The proximity switch also includes a pivoting cross arm. A second magnet may be movably disposed within the switch body, and the second magnet may be rigidly connected to the cross arm. When a magnetic target is not located within a specified range of the second magnet, the first magnet attracts the second magnet, thereby pivoting the cross arm into a first switch position and closing a first circuit. However, when the magnetic target is located within the specified range, the magnetic attraction between the target and the second magnet is greater than between the second magnet and the first magnet. The second magnet is displaced towards the target away from the first magnet, thereby pivoting the cross arm into a second switch position.

Exemplary embodiments are directed to a bistable magnetic actuator for a medium voltage circuit breaker arrangement, including at least one electrical coil for switching a ferromagnetic armature between a first limit position and a second limit position effected by an electromagnetic field, at least one permanent magnet for holding the armature in one of the two limit positions corresponding to an open and a closed electrical switching position respectively of the mechanically connected circuit breaker. The armature includes an upper plunger resting on a ferromagnetic core element of the one electrical coil for static holding the armature in the first limit position, which is attached to a plunger rod extending through the ferromagnetic core element and through the permanent magnet for mechanically coupling the actuator to the circuit breaker arrangement.

A switch device is provided. A movable contact positioned in a sealed case is moved together with a movable contact spring provided with an armature by a magnetic shunt body which is moved outside the sealed case. Because the movement of the magnetic shunt body is based on the change of the magnetically attracting force of a magnet with respect to the armature through a pair of yokes. The movable contact spring is provided with a bent portion which is bent in spaced-apart relation to the armature, the bent portion being provided between a fulcrum portion at a time when the movable contact spring moves and a portion where the armature is provided. The switch device moves the fixed contact and the moveable contact separated from the external substance involving into the shell of the fixed contact and moveable contact, which can quickly complete the contact of the two points and improve the switch performance and reduce the sliding contact of the relevant accessories causing the powder; the powder is not good for the contact of the fixed contact and moveable contact.

Magnetic attractive force of a magnet exerted on a movable contact in a sealing case through yokes changes as a result of movement of a magnetic shunt element induced by movement of a movable element located outside the sealing case. As a result, the movable contact can be brought into or out of contact with a stationary contact without involvement of entry of the movable element into the sealing case.

A quick-disconnect connector assembly includes a housing having a bore that extends up to but not through a first end of the housing. The connector assembly also includes a proximity switch disposed within the bore, and the proximity switch includes a switch body, a first contact member, and a second contact member. A portion of each of the first and second contact members extends from the switch body towards a second end of the housing. In a first switch position, a contact of a displaceable switching assembly is in contact with the first contact member, and in a second switch position, the contact is in contact with the second contact member. The connector assembly also includes an external connection assembly including a first pin that is electrically coupled to the first contact member and a second pin that is electrically coupled to the second contact member.

A contactless rotary pull switch includes a switch knob assembly rotatable about an axis to a plurality of rotational positions and actuatable to at least one pull position, with the switch knob assembly including a knob element and a rotational shaft fixedly coupled thereto. A rotational magnet is coupled to the rotational shaft so as to rotate therewith, and at least one pull magnet is positioned separately from the rotational magnet. A rotational sensor senses a magnetic field generated by the rotational magnet to identify a rotational position of the switch knob assembly and at least one pull sensor senses a magnetic field generated by the pull magnet(s) to identify a pull position of the switch knob assembly. A rotatable arm member selectively enables / inhibits sensing of the magnetic field generated by the pull magnet(s) by the at pull sensor(s), to identify distinct pull positions of the switch knob assembly.

Switch apparatus (54), designed to detect relative movement between first and second members (60, 62), includes a switch assembly (48) comprising a switch unit (20), a biasing element (50), and an operating member (52). The unit (20) has a conductive housing (22) with first, second, and third electrical pin contacts (36-40) and a shiftable body (46). The body (46) is magnetically correlated with both the element (50) and operating member (52). When the members (60, 62) are close, the operating member (52) maintains the shiftable body (46) in one switch position, whereas when the members (60, 62) are separated, the biasing element (50) magnetically moves body (46) to another switch position, thereby detecting the relative movement).

The invention relates to a control switch, especially to a magnetic fluid switch with copper nano particles and a distributed combination method. The switch is characterized in that a magnetic fluid state is changed by controlling a magnetic field direction so as to realize closing, disconnection or selection of a circuit. According to the magnetic fluid, copper nano particles are mixed with temperature-sensing insulating magnetic fluid and a retention agent is also added to keep a uniform mixing state. On the basis of the principle, a distributed structure of a magnetic fluid switch is designed; and rapid combination can be realized according to different practical demands. In addition, the invention also includes a specific structure of a magnetic fluid switch and a distributed combination method thereof. Compared with the prior art, the magnetic fluid has good performances of heat radiation, sealing, and easy aging prevention. The magnetic fluid switch enables the original switch operation mode to be changed and a novel switch material and a novel combination method are invented. On the basis of the distributed structure, the modularized design combination can be realized rapidly; and multi-channel selection and capacity expansion of the switch terminal are realized.

The invention provides for magnetic resonance imaging system (600) comprising a superconducting magnet (100) with a first current lead (108) and a second current lead (110) for connecting to a current ramping system (624). The magnet further comprises a vacuum vessel (104) penetrated by the first current lead and the second current lead. The magnet further comprises a magnet circuit (106) within the vacuum vessel. The magnet circuit has a first magnet circuit connection (132) and a second magnet circuit connection (134). The magnet further comprises a first switch (120) between the first magnet connection and the first current lead and a second switch (122) between the second magnet connection and the second current lead. The magnet further comprises a first current shunt (128) connected across the first switch and a second current shunt (130) connected across the second switch. The magnet further comprises a first rigid coil loop (124) operable to actuate the first switch. The first rigid coil loop forms a portion of the first electrical connection. The magnet further comprises a second rigid coil loop (126) operable to actuate the second switch. The second rigid coil loop forms a portion of the second electrical connection.

A movable contact positioned in a sealed case is moved together with a movable contact spring provided with an armature by a magnetic shunt body which is moved outside the sealed case. The movement of the movable contact (movement of the movable contact spring) due to the movement of the magnetic shunt body is based on the change of the magnetically attracting force of a magnet with respect to the armature through a pair of yokes. The movable contact spring is provided with a bent portion which is bent in spaced-apart relation to the armature, the bent portion being provided between a fulcrum portion at a time when the movable contact spring moves and a portion where the armature is provided.

A low energy magnet actuator allows magnetic fields to be turned on and off using a small amount of energy. The magnetic actuator according to the invention generally includes a base suitable for the support of a plurality of magnets. An actuatable shield is positioned in relation to the plurality of magnets so that it effectively blocks the magnetic field when it is positioned over at least one of the magnets. The magnetic fields of the plurality of magnets interact in a manner that allows low energy actuation of the shield.

Switch apparatus (54), designed to detect relative movement between first and second members (60, 62), includes a switch assembly (48) comprising a switch unit (20), a biasing element (50), and an operating member (52). The unit (20) has a conductive housing (22) with first, second, and third electrical pin contacts (36-40) and a shiftable body (46). The body (46) is magnetically correlated with both the element (50) and operating member (52). When the members (60, 62) are close, the operating member (52) maintains the shiftable body (46) in one switch position, whereas when the members (60, 62) are separated, the biasing element (50) magnetically moves body (46) to another switch position, thereby detecting the relative movement).