Patent application number | Description | Published |
20090108836 | Position Sensor - A position sensor comprises: a cosine coil and a sine coil as excitation coils which generate excitation signals; a detection coil which detects the excitation signal generated from the cosine coil and the sine coil; and a phase-difference detector serving as a converter that calculates a position of the detection coil based on the excitation signal detected by the detection coil. The cosine coil and the sine coil are plate-shaped conductors each including: a plurality of vertically bent segments which function as a coil; and connecting wire portions provided on both sides of the segments to connect the segments. | 04-30-2009 |
20100066347 | Position sensor - A resolver the resolver comprising an excitation coil for receiving an excitation signal formed by amplitude modulation of a high-frequency signal and a detection coil for outputting a detection signal. The resolver is arranged to detect a change in position of a rotor provided with the excitation coil or the detection coil based on the detection signal varying with the change in position of the rotor. The high-frequency signal is a digitized signal generated from a reference clock. | 03-18-2010 |
20100109491 | Motor structure with rotation detector - A casing of a motor with resolver includes a stator, a motor shaft rotatably supported by a bearing, a motor rotor integrally rotatable with the motor shaft, and a resolver for detecting a rotation angle of the motor rotor. The resolver includes a disc-shaped resolver stator held on the motor casing and having a surface on which a thin-film-shaped coil is formed, and a disc-shaped resolver rotor provided on an end face of the motor rotor and having a surface on which a thin-film-shaped coil is formed. Part of the motor casing holding the outer periphery of the resolver stator is formed as a shield portion cylindrically protruding along the outer periphery of the resolver rotor to the rotor. The motor casing and the shield portion are each made of a non-magnetic conductive material. | 05-06-2010 |
20100117631 | Resolver - A resolver comprises an excitation coil for receiving an excitation signal and a detection coil for outputting a detection signal. The detection sine wave is changeable according to an amount of displacement of a movable element provided in the excitation coil or the detection coil. The resolver detects the amount of displacement of the movable element based on the excitation signal and the detection signal. The detection coil is one coil formed of a first detection coil pattern and a second detection coil pattern connected in series or in parallel such that the second detection coil pattern is shifted in phase by a half cycle from the first detection coil pattern. | 05-13-2010 |
20100117632 | Resolver - A resolver includes a disc-shaped rotor provided with a detection coil pattern formed in flat shape and a stator formed in flat plate shape placed to concentrically fact the rotor in an axial direction and configured such that a planar first excitation coil pattern to which a cosine wave is supplied and a planar second excitation coil pattern to which a sine wave is supplied, the first and the second patterns being laminated. The first and second excitation coil patterns are placed to face the detection coil pattern. An insulation layer is formed with insulating coating material between the first and second excitation coil patterns. | 05-13-2010 |
20100244816 | Resolver - A resolver comprises a first coil layer and a second coil layer each formed on a flat plate and an insulating layer formed between the first coil layer and the second coil layer. A SIN signal excitation coil includes a SIN first coil formed in the first coil layer and a SIN second coil formed in the second coil layer. A COS signal excitation coil includes a COS first coil formed in the first coil layer and a COS second coil formed in the second coil layer. | 09-30-2010 |
20100315075 | Resolver of phase difference type - A phase difference type resolver is adapted such that a calculator calculates an angle from a phase difference at a detection-signal zero cross point, determines a velocity at the angle based on an angle calculated from a phase difference at a previous detection-signal zero cross point, calculates an estimated angle at a next detection-signal zero cross point based on the velocity, divides a difference between the estimated angle and the angle into predetermined minimum detection angles, and outputs a real-time signal based on the minimum detection angles in a range after the angle but before the estimated angle. | 12-16-2010 |
20110031850 | Structure of Rotation Detector-Equipped Motor and a Manufacturing Method Thereof - A motor is provided with a rotation detector including a detection rotor and a detection stator placed to face the detection rotor. The motor further includes a motor case and a motor shaft protruding out of the motor case. The detection rotor is fixed to an end of the motor shaft. The detection rotor includes a plate and a coil provided on the plate. The plate is fixed to the end of the motor shaft. Specifically, the motor shaft includes an opening in the end. The plate has a circular disc shape and a cylindrical portion protruding in the center from the back side. The cylindrical portion is press-fitted in the opening of the motor shaft to fix the plate to the end of the motor shaft. | 02-10-2011 |
20110109304 | ROTATION ANGLE SENSOR - A rotation angle sensor comprises: a resolver stator including an excitation coil for receiving an excitation signal and a detection coil (a sine wave coil and a cosine wave coil) for outputting a detection signal; and a resolver rotor rotatably placed to face the stator. The resolver stator is formed on a stator flat plate. The resolver rotor is made of a flat-shaped rotor flat plate. The stator flat plate and the rotor flat plate are placed in parallel to face each other. The rotor flat plate is formed with a cutout. | 05-12-2011 |
20120274185 | MOTOR ROTOR AND MOTOR - A motor with rotation detector includes a rotary shaft, a core part placed around the shaft and provided with axially extending through holes, permanent magnets individually mounted in the through holes, a pair of end plates provided at both ends of the core part to close openings of the through holes, and a motor stator including a coil. The end plates are made of a non-magnetic substance. One of the end plates is provided, on its outer surface in an axial direction, with recesses and protrusions for angle detection alternately arranged in a circumferential direction. A sensor stator with an excitation coil to which a high frequency signal is inputted is located to face the recesses and protrusions of the outer surface of the end plate. | 11-01-2012 |
20140020664 | CONTROL APPARATUS FOR ENGINE - An engine includes an injector, an ignition plug, a supercharger, an electronic throttle device, and an EGR apparatus. An EGR passage has an inlet connected to an exhaust passage downstream of a turbine and an outlet connected to the intake passage upstream from a compressor. A fresh-air introduction passage is arranged to introduce fresh air to a surge tank downstream from the electronic throttle device and a fresh-air control valve is provided to regulate a fresh air amount. When an ECU determines that the engine is under deceleration and under fuel supply, the ECU closes the electronic throttle device to a predetermined opening degree to scavenge EGR gas flowing from the EGR passage and remaining in the intake passage, opens a fresh-air control valve to a predetermined opening degree, and causes the ignition plug to retard an ignition timing. | 01-23-2014 |
20140137844 | EXHAUST GAS RECIRCULATION APPARATUS FOR AN ENGINE - An EGR apparatus for an engine includes an EGR passage, an EGR valve, an accelerator sensor, and an ECU. The ECU compares a change amount (accelerator operating speed) per unit of time of an accelerator opening degree to a predetermined first determination value. When it is determined that a request for deceleration operation or acceleration operation is made to an engine, the ECU issues a fully closing command to the EGR valve. When it is determined that the deceleration or acceleration operation request is continued, the ECU continues to issue the fully closing command. When the deceleration or acceleration operation request is removed and the accelerator opening degree is larger or smaller than a predetermined second determination value, the ECU releases the fully closing command. | 05-22-2014 |
20150075162 | EXHAUST GAS RECIRCULATION APPARATUS OF ENGINE WITH SUPERCHARGER - In an engine provided with a supercharger and a low pressure loop EGR apparatus, an ECU controls an EGR valve to fully close when a detected operating condition is a predetermined operating condition. An outlet of an EGR passage is located at a higher position than an inlet in a vertical direction to allow condensed water to flow downward from downstream to upstream of the EGR valve and flow downward through the EGR passage to an exhaust passage. When the EGR valve has to be controlled to fully close, the ECU forcibly opens the EGR valve when a predetermined discharge condition is established to discharge the condensed water from a downstream side of the EGR valve. | 03-19-2015 |
20150082790 | LOW-PRESSURE-LOOP EXHAUST RECIRCULATION APPARATUS OF ENGINE - A low-pressure-loop EGR apparatus of an engine includes an EGR passage to allow part of exhaust gas discharged from a combustion chamber to return as EGR gas to the combustion chamber, and an EGR valve to regulate a flow of EGR gas in the EGR passage. This passage has an inlet connected to an exhaust passage downstream of a turbine and an outlet connected to an intake passage upstream of a compressor. In the intake passage, an intake bypass passage is provided to connect an upstream portion and a downstream part from the compressor. An ABV is provided in the passage. To remove EGR gas remaining in the ABV, one end of a residual gas removal passage is connected to the intake passage downstream of a throttle valve and the other end of the same passage is connected to the ABV. | 03-26-2015 |