A magnetic body holding device includes: a first pole piece having a first interaction surface and a second interaction surface; a second pole piece having a third interaction surface and a fourth interaction surface; a first stationary magnet disposed to be adjacent to the first interaction surface and the third interaction surface; a second stationary magnet disposed to be adjacent to the second interaction surface and the fourth interaction surface; a rotary magnet rotatably disposed between the first stationary magnet and the second stationary magnet; a first coil disposed between the first stationary magnet and the rotary magnet and wound around at least one of the first pole piece and the second pole piece; and a second coil disposed between the second stationary magnet and the rotary magnet and wound around at least one of the first pole piece and the second pole piece.

A switchable permanent magnetic unit is disclosed. The unit comprises: a housing, first and second permanent magnets, and a conductive coil. The first magnet is mounted within the housing and the second magnet is rotatable between first and second positions and mounted within the housing in a stacked relationship with the first magnet. The unit generates a first level of magnetic flux at a workpiece contact interface when the second magnet is in the first position and a second level of magnetic flux at the interface when the second magnet is in the second position, the second level being greater than the first level. The conductive coil is arranged about the second magnet and generates a magnetic field. A component of the conductive coil's magnetic field is directed from S to N along the second magnet's N-S pole pair when the second magnet is in the first position.

When at least one of a value a detected output current to a magnet and a magnet load defined by the following formula is equal to or larger than a threshold value predetermined for the value of the detected output current or a threshold value predetermined for the magnet load, a controller constituting a control device outputs, to a control circuit, a command to decrease voltage applied to the magnet from next attracting operation. Magnet load=excitation ratio×I×V . . . ; wherein excitation ratio: excitation time/(excitation time+non-excitation time); I: value of the output current; V: voltage applied to a lifting magnet.

An electromagnetic apparatus includes a non-magnetic body structure above a substrate. The electromagnetic apparatus further includes at least one isolation structure including a dielectric material on a portion of the body structure and a magnetic structure having two separate portions, one on each side of the isolation structure. A first magnetic structure portion is on a first sidewall of the isolation structure on an upper surface and on a first sidewall of the body structure and a second magnetic structure portion is on an opposite second sidewall of the isolation structure onto an upper surface and on to a second sidewall of the body structure. The electromagnetic apparatus further includes an electromagnet on a side opposite to the isolation structure. The electromagnet is coupled with the magnetic structure and is a source of the magnetic flux lines when energized.

A locking knife holder uses either mechanical or electronic locking systems to secure the knives into the holder. The electronic locking system includes the implementation of one or more electromagnets into the holder. The user can then selectively lock or unlock the knives in the holder by activating or deactivating, respectively the electromagnet. In other implementations, the mechanical locking system can use magnetic keys to unlock the mechanical locking system.

This disclosure details tie-down systems for securing cargo within vehicle cargo spaces. An exemplary tie-down system may include a vehicle-mounted magnetic assembly and a tie-down that may be magnetically connected to the magnetic assembly for securing cargo within the cargo space. A magnet of the magnetic assembly may be energized to hold the tie-down and cargo in place within the cargo space or de-energized to release the tie-down and the cargo relative to the cargo space.

A device, apparatus, and method for semiconductor transfer are provided. A transfer substrate is controlled to be moved to be above the target substrate. An infrared emitting portion emits infrared signals to position a semiconductor on a target substrate. After a second magnetic portion picks up the semiconductor from the target substrate, a controller outputs a first control current to a first electromagnetic portion to cause the first electromagnetic portion to generate an electromagnetic force, to control the second magnetic portion to adjust a position of the picked-up semiconductor relative to the welding position on the target substrate, where adjusting the position of the picked up semiconductor includes horizontal adjustment.

An electrically operated fluid flow valve arrangement (50) includes an electrically powered magnetic field generator (42), a valve body (44) defining a valve chamber (7), an inlet port (5), an outlet port (20) and a valve member (18) located in the chamber (7). The valve member (18) is movable between closed and open conditions relative to one of the ports (5, 20). The valve member (18) includes a permanent magnet (9). The arrangement (50) includes a switchable pole 46 formed of a ferromagnetic material. In use, in a first latched condition, the valve member (18) is retained by the switchable pole (46) in one of the closed or open conditions and, in a second latched condition, in the other of the closed or open conditions, the valve member (18) being moved from one latched condition to the other by operation of the generator (42).

A magnetic platform which is adaptable for receiving trays of different sizes and types includes a base and a plurality of first magnets. The first magnets are fixed and held to the base by magnetic attraction. The positions of the first magnets on the base can be changed to accommodate different trays.

An object is to provide a lifting-magnet attachment magnetic pole unit, a lifting magnet, a steel material conveying method, and a steel plate manufacturing method with which only one or a desired pieces of steel materials can be held. The present invention is a lifting-magnet attachment magnetic pole unit for a lifting magnet used to lift and convey a steel material with magnetic force. The lifting-magnet attachment magnetic pole unit includes a first split magnetic pole that is in contact with an iron core of the lifting magnet and has a branched structure, and a second split magnetic pole that is in contact with a yoke of the lifting magnet and has a branched structure. The first and second split magnetic poles are alternately arranged.