Abstract: A stepping motor according to the present invention used in a case containing oil includes a motor having a coil formed with a conductor wound around a bobbin and a cover member enclosing the coil, and a housing which houses the motor. The cover member serves to protect the coil from being directly subjected to molding pressure when the housing is injection-molded.

Abstract: An electromagnetic device includes an outer casing, a shaft rotatably supported by the outer casing, and a motor main body disposed inside the outer casing, the motor main body having a stator and a rotor, the stator having coils each constructed by winding a conducting wire onto a bobbin, the coils being embedded in an outer molding, and cores being disposed so as to cover the outer molding, and the rotor being secured to the shaft, wherein the conducting wire of the coils is constructed by coating onto a copper wire an electrically-insulating layer composed of denatured polyimide resin which is a material resistant to permeation by sulfur compounds.

Abstract: A stepping motor being a motor used in oil includes a coil formed with a conductor coated with an outer coating and wound around a bobbin, and coil terminals electrically connected to the conductor at ends thereof led out from the coil, the outer coating being removed from the conductor at the ends thereof. The coil terminals are coated with a protective film made of a material having low permeability to elemental sulfur and sulfur compounds. Therefore, coil terminals and ends of the conductor are prevented from erosion by sulfur and organic sulfur compounds, thereby reducing risk of disconnection in the coil terminals and the conductor.

Abstract: An electromagnetic device including an outer casing, a shaft rotatably supported by the outer casing, and a motor main body disposed inside the outer casing. The motor main body has a stator and a rotor. The stator has coils constructed by winding conducting wires onto conducting-wire spool portions of first and second bobbins. The coils are embedded in an outer molding, cores are disposed so as to cover the outer molding, and the rotor is secured to the shaft The coils are constituted by first phase and second phase excitation coils formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the first bobbin. Further, third phase and fourth phase excitation coils are formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the second bobbin.

Abstract: An electromotive device includes an outer casing, a shaft supported by the outer casing, a bobbin disposed inside the outer casing so as to be disposed around the shaft on a common axis with the shaft, and a coil embedded in an outer molding, the coil being constructed by winding a conducting wire onto the bobbin, the bobbin and the outer molding being composed of an epoxy resin, which is an electrically-insulating material resistant to permeation by sulfur compounds.

Abstract: An electromagnetic device including an outer casing, a shaft rotatably supported by the outer casing, and a motor main body disposed inside the outer casing. The motor main body has a stator and a rotor. The stator has coils constructed by winding conducting wires onto conducting-wire spool portions of first and second bobbins. The coils are embedded in an outer molding, cores are disposed so as to cover the outer molding, and the rotor is secured to the shaft The coils are constituted by first phase and second phase excitation coils formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the first bobbin. Further, third phase and fourth phase excitation coils are formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the second bobbin.

Abstract: An electromagnetic device including an outer casing, a shaft rotatably supported by the outer casing, and a motor main body disposed inside the outer casing. The motor main body has a stator and a rotor. The stator has coils constructed by winding conducting wires onto conducting-wire spool portions of first and second bobbins. The coils are embedded in an outer molding, cores are disposed so as to cover the outer molding, and the rotor is secured to the shaft. The coils are constituted by first phase and second phase excitation coils formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the first bobbin. Further, third phase and fourth phase excitation coils are formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the second bobbin.

Abstract: An automatic transmission includes a transmission case containing oil, a transmission structure housed in the transmission case, for varying the ratio of rotational speeds between a driving shaft connected to wheels and an engine shaft connected to an engine, a transmission control valve housed in the transmission case, for controlling the transmission structure, and a motor as a driving source for driving the transmission control valve. The motor includes a cover, a motor body having a coil disposed under the cover and formed with a wound conductor, a shaft rotated by an electrical current applied to the coil, and a converting structure for converting the rotational movement of the shaft into linear movement. The motor is fixed to the transmission case so that the motor body is disposed in air.

Abstract: A stepping motor according to the present invention used in a case containing oil includes a motor having a coil formed with a conductor wound around a bobbin and a cover member enclosing the coil, and a housing which houses the motor. The cover member serves to protect the coil from being directly subjected to molding pressure when the housing is injection-molded.

Abstract: An electromotive device includes an outer casing, a shaft supported by the outer casing, a bobbin disposed inside the outer casing so as to be disposed around the shaft on a common axis with the shaft, and a coil embedded in an outer molding, the coil being constructed by winding a conducting wire onto the bobbin, the bobbin and the outer molding being composed of an epoxy resin, which is an electrically-insulating material resistant to permeation by sulfur compounds.

Abstract: A stepping motor being a motor used in oil includes a coil formed with a conductor coated with an outer coating and wound around a bobbin, and coil terminals electrically connected to the conductor at ends thereof led out from the coil, the outer coating being removed from the conductor at the ends thereof. The coil terminals are coated with a protective film made of a material having low permeability to elemental sulfur and sulfur compounds. Therefore, coil terminals and ends of the conductor are prevented from erosion by sulfur and organic sulfur compounds, thereby reducing risk of disconnection in the coil terminals and the conductor.

Abstract: An automatic transmission includes a transmission case containing oil, a transmission structure housed in the transmission case, for varying the ratio of rotational speeds between a driving shaft connected to wheels and an engine shaft connected to an engine, a transmission control valve housed in the transmission case, for controlling the transmission structure, and a motor as a driving source for driving the transmission control valve. The motor includes a cover, a motor body having a coil disposed under the cover and formed with a wound conductor, a shaft rotated by an electrical current applied to the coil, and a converting structure for converting the rotational movement of the shaft into linear movement. The motor is fixed to the transmission case so that the motor body is disposed in air.

Abstract: An electromagnetic device includes an outer casing, a shaft rotatably supported by the outer casing, and a motor main body disposed inside the outer casing, the motor main body having a stator and a rotor, the stator having coils constructed by winding conducting wires onto conducting-wire spool portions of first and second bobbins, the coils being embedded in an outer molding, and cores being disposed so as to cover the outer molding, and the rotor being secured to the shaft, the coils being constituted by first phase and second phase excitation coils formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the first bobbin, and third phase and fourth phase excitation coils formed by winding two of the conducting wires into unifilar windings on the conducting-wire spool portion of the second bobbin.

Abstract: An electromagnetic device includes an outer casing, a shaft rotatably supported by the outer casing, and a motor main body disposed inside the outer casing, the motor main body having a stator and a rotor, the stator having coils each constructed by winding a conducting wire onto a bobbin, the coils being embedded in an outer molding, and cores being disposed so as to cover the outer molding, and the rotor being secured to the shaft, wherein the conducting wire of the coils is constructed by coating onto a copper wire an electrically-insulating layer composed of denatured polyimide resin which is a material resistant to permeation by sulfur compounds.

Abstract: The present invention provides a compact duty-driven solenoid valve which inhibits occurrence of impact sound upon driving and prevents occurrence of adherence at low temperatures. In this duty-driven solenoid valve, a plunger is arranged in a center hole of a bobbin having a coil wound thereon, and a guide made of a magnetic material is arranged on one end side of the bobbin, opposite to the plunger. A spring is provided so as to impart a force to move the plunger toward the guide, and further, a valve assembly for switching over a channel for a control fluid is arranged opposite to the plunger with the guide in between. A rod for transmitting a moving force of the plunger to the valve assembly is arranged so as to be inserted through the guide and to reach the valve assembly. The positional relationship between the rod and the valve assembly is configured to maintain a prescribed gap between the plunger and the guide during feeding of current to the coil.

Abstract: A three way electromagnetic valve has a plunger provided with a small-diameter section, the diameter of which is smaller than the diameter of a plunger seat, so as to increase the sectional area of a fluid passage running between an output port and a discharge port. The inner wall surface of a ball holding section is provided with ball guides for guiding a ball. The diameter of the ball holding section is made larger than the diameter of the ball in order to secure the flow rate of a fluid in the ball holding section.

Abstract: A strain detector to be attached to the shafts of devices such as engines, motors, electromagnetic clutches. First and second magnetic layers are disposed on the driven shaft so as to change permeability with a mechanical strain in the shaft. First and second detecting coils are wound around the first and second magnetic layers so as to be in a noncontact state therewith. Detecting means detects outputs of the detecting coils corresponding to the change in permeability. Furthermore, the driven shaft includes a heat conductive means with conductivity which is high enough to allow a temperature of each of said magnetic layers to be uniform. The outputs of the first and second detecting coils are detected in synchronism with both positive and negative drive timings of the AC drive circuit for applying an AC voltage to each of the detecting coils and smoothed and amplified thereafter, thereby allowing two strain detection outputs to be produced.

Abstract: A strain detector includes a passive member for receiving an external force, magnetostrictive layers formed on a surface of passive member and made of a magnetic material containing nickel and at least one kind of metal sulfide produced from reaction of a metal more reactive with sulfur than nickel with sulfur as an impurity, and a detection coil provided close to an exterior of magnetostrictive layers and used for detecting variations of permeability caused by strain of the magnetostrictive layers in response to the external force.

Abstract: The present invention relates to an angle detection sensor including: a magnetoresistive element in which a bias magnet is laminated on a magnetic pattern resistance layer of a thin film ferromagnetic material, and a permanent magnet fixed to a rotation shaft which rotates about the center of the magnetoresistive element. In particular, when a rotation angle of the permanent magnet is large, a ratio of a first magnetic force of said permanent magnet to a second magnetic force of said bias magnet is set to be smaller than 1, and, when the rotation angle of the permanent magnet is small, the ratio of the first magnetic force of the permanent magnet to the second magnetic force of the bias magnet is set to be larger than 1.

Abstract: A rear-wheel steering angle detecting apparatus according to the present invention includes an absolute value type rotary encoder (13) operatively connected with a rear-wheel steering mechanism for detecting the steering angle of the rear wheels of a vehicle, and a controller for finely dividing the output of the rotary encoder by the output of a pulse generator (12) for fine division of the rear-wheel steering angle. By finely dividing the rear-wheel steering angle, as detected by the rotary encoder, by the number of pulses generated by the pulse generator, which is used for speed detection, the rear-wheel steering angle is detected with a high degree of resolution.