Toyo Denso Kabushiki Kaisha

Ebara Corporation

Toyo Denso Co., Ltd.

Toyo Dense Co., Ltd.

Toshiya Yoshida

Shoji Kishi

Toshimitsu Barada

Takayuki Otani

Toshikazu Murata

Hiroaki Iwata

Toshimitsu Ebara Corporation Barada

A magnetic sensor unit capable of accurately detecting a change of a magnetic field by a magnetic sensor and accurately positioning each magnet with respect to a yoke includes a yoke fixed to a rotor relatively displaced with respect to a base plate, two magnets fixed to the yoke and disposed apart from each other in a relative displacement direction of the rotor, and a magnetic sensor fixed to the base plate and detecting a change of a magnetic field formed by the two magnets. The yoke has a convex portion protruding between the two magnets. The convex portion includes abutting portions on which the two magnets abut.

Magnetic sensor unit for accurately detecting change of magnetic field

An accelerator position sensor according to the present invention is held inside a throttle grip of a vehicle rotationally operated by a driver. The accelerator position sensor includes: a magnet extended along a rotation axis of the throttle grip and configured to rotate in conjunction with the throttle grip; a magnetic detection unit arranged so as to face a predetermined face of the magnet; and a magnetic body arranged so as to face another face that is different from the predetermined face of the magnet. On the predetermined face and the other face of the magnet, respectively, mutually different numbers of magnetic poles are magnetized along a rotation direction of the magnet.

Accelerator position sensor

A position sensor of the present invention includes: a magnet that moves together with a moving body; a magnetic sensor that detects a magnetic flux generated by the magnet; and a detector that detects an anomaly of the magnetic sensor based on a detection value detected by the magnetic sensor. The magnetic sensor is set so as to detect the detection value taking a value on a locus preset in accordance with a position of the moving body, and the locus is set so that a change rate of the detection value corresponding to change of the position of the moving body differs for each of a plurality of sections set within a movement range of the moving body. The detector detects the anomaly of the magnetic sensor based on a relation between the detection value and a comparison value that is a value corresponding to the locus.

Position sensor and position detection method

A grip, a magnet, and a substrateare included. The grip is rotatable between positions where a throttle is fully closed and a position where the throttle is fully open with a rotating shaft as a center. The magnetrotates integrally with the grip. The substrateincludes a plurality of Hall elementsand, and is fixed to face the magnet. The plurality of Hall elementsandare disposed in such a way that magnetic flux densities different from each other are respectively applied to the plurality of Hall elementsandwhen an external magnetic field acts in a state where the grip is located in the position where the throttle is fully closed.

Throttle device

Provided is a throttle grip device that can stably generate an operation feeling and achieves downsizing itself. A throttle grip device includes a throttle grip attached to a handlebar, an accelerator position sensor, and a return spring. The accelerator position sensor and the return spring are accommodated inside the handlebar so as to be arranged tandemly along a straight line. The accelerator position sensor includes a cylindrical inner rotor in which a plurality of magnetic poles is magnetized along a circumferential direction, a magnetic material-made outer case configured to accommodate the inner rotor, and a sensor IC disposed facing a sensor side end of the inner rotor and offset from a central axis of the inner rotor. The inner rotor rotates in conjunction with the throttle grip.

Throttle grip device using magnet

A rotation angle detection sensor includes a magnet body subjected to magnetization in an in-plane direction, a first Hall element and a second Hall element separated from each other and arranged offset to one of spaces divided by an imaginary plane including a rotation axis, and a third Hall element located in a position away from a straight line passing through the first Hall element and the second Hall element. A storage section stores a rotation angle that is related to electric signals having a phase difference therebetween, among electric signals of the first Hall element, the second Hall element, and the third Hall element. A detection section detects the electric signals of the first Hall element, the second Hall element, and the third Hall element and obtains from the storage section the rotation angle that is related to the detected electric signals.

Apparatus for dynamically sensing a rotation angle of a rotary body

A magnetic rotation detection apparatus which is capable of suppressing occurrence of assembly failure of components. A gear position sensoris provided with a sensor unitincluding a Hall element, a magnet shaftincluding a magnet, a casehousing the sensor unitand the magnet shaft, and an inner O-ringsealing a gap between the sensor unitand the case. The caseincludes a metal bearingto support the magnet shaft, and the magnet shaftincludes a molded portionto fix the magnet. A thrust plateis arranged between the molded portionand a base plate(circuit board) of the sensor unit, and a spring mechanismis arranged to bias the molded portionto the thrust plate. A minute gap is present between the metal bearingand the magnet shaft

Magnetic rotation detection apparatus

Handle switch

An energy-saving magnetic bearing device with no bias current for making the relation between the excitation current and the magnetic force of the electromagnet linear is provided. In a magnetic bearing device for supporting a rotorserving as the magnetic piece in a levitating state allowing free rotation at a specified position by the magnetic force of a pair of electromagnets, the electromagnetsare constituted to interpose the rotorand face each other. A driveris a PWM (pulse width modulation) type driver for controlling the excitation current in the electromagnetsby modulating the pulse width of a voltage driven at a specified carrier frequency fc, and includes a resonator means for electrically resonating at a frequency equal to the carrier frequency fc. When an excitation current flows in either one of the pair of opposing electromagnets, then the other magnet is regulated so that the DC component in the electromagnet excitation current is zero, and a voltage is applied via the resonator means to the electromagnet whose DC component in the excitation current is discharged to zero.

Magnetic bearing device and method

A magnetic bearing apparatus supports a rotating object using magnetic levitation by a magnetic force of electromagnets. The magnetic bearing apparatus includes a PWM driver configured to supply exciting currents to the electromagnets, a driver power source configured to drive the PWM driver, and a displacement error signal removing section configured to extract a displacement error signal of the displacement information from a current flowing through the driver power source and to remove the displacement error signal from the displacement information.

Growing community of inventors

Saitama, Japan

Toshiya Yoshida