3792 results about "Excitation coil" patented technology

An image forming apparatus includes an image carrier, a developing unit, a transfer unit, and a fixer to fix an image formed on a sheet and includes a rotary heat generator including a heat generation layer, a pressure member to form a nip with the rotary heat generator to sandwich the sheet therebetween, an excitation coil disposed facing the rotary heat generator, to inductively heat the heat generation layer, a demagnetization coil disposed facing the heat generation layer, to generate magnetic flux that partly counteracts magnetic flux generated by the excitation coil and a fixer controller to control activation of the excitation coil as well as the demagnetization coil before a second image formation job after completion of a first image formation job in which an image is formed on a sheet of recording media whose width is smaller than a maximum sheet width usable in the fixer.

A fixing device includes an excitation coil, a heat-generating layer, a magnetic shunt layer, and a degaussing member. The excitation coil generates a magnetic flux. The heat-generating layer generates heat using the magnetic flux generated by the excitation coil. The magnetic shunt layer transmits heat generated by the heat-generating layer. The degaussing member sandwiches the magnetic shunt layer together with the excitation coil, and selectively performs degaussing by generating a repelling magnetic flux for canceling the magnetic flux generated by the excitation coil so as to activate a self-temperature-control function. The degaussing member selectively refrains from degaussing so as to deactivate the self-temperature-control function.

A system for generating a magnetic field for excitation of a leadless marker assembly. The system of at least one embodiment includes a source generator that generates a plurality of alternating electrical signals each having an independently adjustable phase. A plurality of excitation coils are configured to simultaneously receive a respective one of the alternating electrical signals at a selected phase to generate a magnetic field. The phase of the alternating electrical signal for each excitation coil is independently adjustable relative to the phase of the alternating electrical signal for the other excitation coils so as to adjust the magnetic field from the respective coil. The magnetic fields from the excitation coils combine to form a spatially adjustable excitation field for excitation of the remote leadless marker assembly.

A fixing device includes an excitation coil, a heat-generating layer, a magnetic shunt layer, and a degaussing member. The excitation coil generates a magnetic flux. The heat-generating layer generates heat using the magnetic flux generated by the excitation coil. The magnetic shunt layer transmits heat generated by the heat-generating layer. The degaussing member sandwiches the magnetic shunt layer together with the excitation coil, and selectively performs degaussing by generating a repelling magnetic flux for canceling the magnetic flux generated by the excitation coil so as to activate a self-temperature-control function. The degaussing member selectively refrains from degaussing so as to deactivate the self-temperature-control function.

The present invention relates to a method and to a device for adapting the alternating current generated by a generator (1) and the alternating voltage generated by a generator (1) to a grid (8), whereby the generator (1) has at least one excitation coil (2). The power fed into the grid (8) can be flexibly adapted while entailing low switching losses in that a static frequency converter (9) is employed for the adaptation between the generator (1) and the grid (8), and in that, in order to control the power fed into the grid (8), means (3) are provided with which, on the one hand, the strength of the excitation field generated by the at least one excitation coil (2) is regulated and, on the other hand, the phase angle between the frequency converter voltage and the generator or grid voltage is appropriately controlled.

The solenoid is capable of generating great thrust and having broad-ranging thrust characteristics. The solenoid of the present invention comprises: a guide pipe formed into a cylindrical shape and provided inside of an excitation coil; a movable element having a small diameter section and a large diameter section; a first yoke part covering one end face of the excitation coil, the first yoke part having a first facing surface, which faces an outer circumferential face of the small diameter section of the movable element, and a second facing surface, which faces one end face of the small diameter section; and a second yoke part covering the other end face of the excitation coil, the second yoke part having a third facing surface, which faces an outer circumferential face of the large diameter section of the movable element, and a fourth facing surface, which faces one end face of the large diameter section.

The present invention provides an object sensor configured such that excitation coils (13c and 13d) and a detection coil (12) are separately disposed, and the detection is performed in accordance with the balance between the excitation coils (13c and 13d) in a pair, a residual variation amount after the impedance due to a DC resistance part and the like has been offset and removed is obtained at high sensitivity with excellent linearity while using a small core body (11), regardless of the impedance including a DC resistance part. Additionally, the object sensor to be used as an inlet sensor is located in an appropriate position on a more upstream side than the read / write position in an insertion direction of the IC card. A contact terminal portion of the IC card is sensed whereby to detect the validity of the card inserted into the apparatus from a card insertion slot. Thereby, steady detection operations can be implemented for the presence or absence of the IC card, notwithstanding environmental temperature variations.The invention further provides an IC card reader configured such that a plurality of inlet sensors for detecting the type of an inserted card is provided in appropriate positions more upstream than the read / write position in a card insertion direction, wherein when an unusable card or the like is inserted, a control operation of closing shutter means can be performed, thereby enabling illegal action with the card to be prevented.

A machine includes a shaft adapted to rotate about a longitudinal axis and formed of a magnetic material and a rotor assembly rotationally engaged with the shaft The rotor assembly includes a pair of rotor disks comprising a magnetic material, each of the rotor disks having a number of magnetic poles, the magnetic poles being spaced apart circumferentially. The rotor disks are coupled to the shaft for rotation about the shaft and generation of a rotating permeance wave. The machine further includes a stator assembly that includes a magnetic core stator disposed between the rotor disks, a number of armature windings supported on the magnetic core stator, and a stationary superconducting field coil disposed between the magnetic core stator and the shaft. The stationary superconducting field coil is configured as a stationary magneto-motive force (MMF) source for the rotating permeance wave produced by the rotor assembly to produce a rotating magnetic field.

This electromagnetic switching device comprises an electromagnetic device 1 in which a movable core 15 comes into contact with or separates from a fixed core 14 in response to energization of an excitation coil 11 wound around a coil bobbin 10 a contact device 2 with a fixed contact 21 and a movable contact which comes into contact with or separates from the fixed contact in conjunction with a movement of the movable core 15 of the electromagnetic device, and a boxy case 3 configured to house the electromagnetic device and the contact device. The coil bobbin 10 has a flange 10a at its end in an axis direction of the coil bobbin, and the case 3 has, on its inner surface, a recess 31 into which a periphery of the flange 10a of the coil bobbin is fitted, and a cushioning member 32 for absorbing an impact which is transmitted from the electromagnetic device to the case is disposed in the recess, and the flange of the coil bobbin is supported by the recess through the cushioning member whereby the electromagnetic device is supported in the case.

A system for sensing stress in a ferromagnetic material is provided. The system includes at least one magnetic flux device configured to induce a conditioning magnetic flux in the ferromagnetic material. The system also includes a sensor positioned proximate to the ferromagnetic material. The sensor includes a core, at least one excitation coil configured to induce a second magnetic flux in the ferromagnetic material, and at least one detector configured to detect changes in the second magnetic flux.

An electric motor, power tool using the electric motor, and method of making the electric motor includes making a stator by separately forming pole pieces, return path pieces and field coils. The field coils are placed over necks of the pole path pieces and the return path pieces are affixed to the pole pieces. An armature having an outside diameter of at least 0.625 the outside diameter of the stator is placed in the stator. In an aspect, the field coils are formed so that they extend beyond pole tips of the pole pieces.