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| Number | Title | Issue Date |
| 8058834 | Control device for automatic transmission A control device for an automatic transmission includes a current detecting unit for detecting motor current. The current detecting unit has a counter for counting variation number of a rotational position signal output from a rotational position detecting unit for ... | 11/15/2011 |
| 7372548 | Levitated reticle-masking blade stage A method, apparatus, and system for controlling a reticle-masking blade in a photolithography system. A reticle-masking blade is supported with a reticle-masking blade carriage assembly. The reticle-masking blade carriage assembly is levitated at a position with res... | 05/13/2008 |
| 7359037 | Drive for reticle-masking blade stage A method, apparatus, and system for controlling a reticle-masking blade in a photolithography system. A reticle-masking blade is supported with a reticle-masking blade carriage assembly. The reticle-masking blade carriage assembly is levitated at a position with res... | 04/15/2008 |
| 7274166 | Apparatus and method for correcting position of mobile robot An apparatus and a method for correcting a position of a mobile robot includes a position notifying unit, installed at a predetermined position, that generates and transmits a signal indicative of the predetermined position. The mobile robot includes a position sign... | 09/25/2007 |
| 7265505 | Control apparatus for selectively driving plural stator windings of synchronous motor A control apparatus for a synchronous motor such as a switched reluctance motor, having a plurality of respectively separate stator windings, can operate the motor in either a normal mode or a low-torque mode by selectively supplying drive current to the stator wind... | 09/04/2007 |
| 7211977 | Pulse width modulation fan control In one embodiment, a fan control system includes a temperature-sensing device that is adapted to sense a temperature of a component and output a temperature feedback signal, and a pulse width modulation control circuit that is configured to receive the temperature f... | 05/01/2007 |
| 7127939 | Measuring method on an electric motor and measuring device for an electric motor for determining the fly height and/or axial play To provide a measuring method on an electric motor with a rotor and a stator for determining the fly height and/or axial play, the rotor being mounted, and in particular fluid-mounted, on the stator, with which method the axial position of the rotor in relation to t... | 10/31/2006 |
| 7129665 | Control apparatus for feed driving system A control apparatus for a machine that can be operated at high precision in a stable control state is provided by driving a movable body with control parameters suited to the mechanical state. A control parameter calculation circuit is provided to obtain control par... | 10/31/2006 |
| 7057369 | System and device for regulating the position of a drivable component and drive therefor A system for detecting the position of a component drivable by a control element drive, the system comprising: a position sensor housed in a position regulator housing, a movable motion representative to be driven by an actuating motion of the component, via which m... | 06/06/2006 |
| 6950175 | System, method, and apparatus for a magnetically levitated and driven reticle-masking blade stage mechanism A method, apparatus, and system for controlling a reticle-masking blade in a photolithography system. A reticle-masking blade is supported with a reticle-masking blade carriage assembly. The reticle-masking blade carriage assembly is levitated at a position with res... | 09/27/2005 |
| 6949844 | High-speed precision positioning apparatus A high-speed precision positioning apparatus has a stage supported by a platen. The stage is driven by a plurality of drive motors that are co-planar with the stage and arranged symmetrically around the stage. The drive motors apply drive forces directly to the stag... | 09/27/2005 |
| 6906789 | Magnetically levitated and driven reticle-masking blade stage mechanism having six degrees freedom of motion A method, apparatus, and system for controlling a reticle-masking blade in a photolithography system. A reticle-masking blade is supported with a reticle-masking blade carriage assembly. The reticle-masking blade carriage assembly is levitated at a position with res... | 06/14/2005 |
| 6859257 | Stage system A stage system includes a movable stage, a force applying mechanism for applying, by use of an electromagnet, a force to the stage in a direction of a magnetic flux generated by the electromagnet, a moving mechanism for moving the electromagnet in the direction, and... | 02/22/2005 |
| 6781337 | Multi-joint type industrial robot In an industrial robot having a plurality of arms, each arm is coupled with other elements, such as a mounting base, another arm, a robotic hand, and revolved by a motion of the revolvable joint. The revolvable joint has a rotary electric connecting structure such a... | 08/24/2004 |
| 6713981 | Pole position detector for motor A pole position detector correctly detects a pole position of a permanent magnet motor. Each magnetic sensor (27) provides an electric signal in response to leakage flux from a magnet rotor (17). A computation unit (2) detects a change in the ou... | 03/30/2004 |
| 6433503 | Synchronous motors and control circuits therefor Hall ICs 23u, 23v and 23w are provided to detect the magnetic fields of magnetic regions 8 of a rotor 9 and are offset in position by an electrical angle of 30° from central positions of a U-phase stator pole 1, V-phase stator pole 6 and W-phase stator p... | 08/13/2002 |
| 6114823 | Circuit and apparatus for sensing fluid flow A circuit and apparatus for magnetically sensing fluid flow through a conduit. The circuit includes a sensor and a sensor magnet for biasing the sensor in an on condition. A second magnet indicative of the relative position of a conduit valve substantiall... | 09/05/2000 |
| 6087796 | Method and apparatus for determining electric motor speed using vibration and flux A programmable apparatus is used to determine the running speed of an ac induction motor based on vibration and flux measurements. A first analysis is performed on at least one of the vibration and flux signals according to a first criterion to determine ... | 07/11/2000 |
| 5926001 | Canned motor bearing wear monitoring device A wear monitoring device for a motor employs pairs of coils on each end of a motor stator. The coils face the rotor and are sensitive to the gap between the rotor and the stator. Each pair of coils is interconnected in series to generate a differential ou... | 07/20/1999 |
| 5841255 | Flux detector system An ac machine monitor, particularly applicable to ac induction motors, provides information for ascertaining the health and condition of the motor. The monitor is self-contained, having its own internal power source, electronics, and sensor suite, and att... | 11/24/1998 |
| 5668456 | Servo motor encoder The invention provides a servo motor encoder in which signals are output via signal lines and output terminals which are used in common. Incremental signals A, B, and Z and servo motor magnetic pole position detection signals UE, VE, and WE are switched b... | 09/16/1997 |
| 5659230 | Brushless motor drive circuit A brushless motor drive circuit which can suppress switching pulses without using capacitors or other external components is provided. The brushless motor drive circuit has a hall element for generating two sinusoidal signals of opposite phase and a switc... | 08/19/1997 |
| 5545961 | Electric motor drive An electric motor drive having a first section and a second section offset with respect to the first section. A control arrangement and an evaluation arrangement are arranged in the first section, and an electric motor and a sensor arrangement are arrange... | 08/13/1996 |
| 5285142 | Wafer stage with reference surface An electromagnetic sub-stage and an electromagnetic monolithic stage coupled such that one follows the other having a single reference surface positioned therebetween. A sub-stage having linear motors for movement in the X-Y direction is mounted by a U br... | 02/08/1994 |
| 5150115 | Inductive type incremental angular position transducer and rotary motion encoder having once-around index pulse An inductive-type rotary encoder includes a stator having at least one conductive pattern on one side thereof, and a rotor having another conductive pattern on one side thereof which faces the at least one conductive pattern of the stator. The conductive ... | 09/22/1992 |
| 5055757 | Automatic toriod turns counter A toroid turns counter for a toroid with at least one winding with turns to be counted by electric counting device connected to said winding having a test winding with an opening for receiving the toroid, a movable contact arm for electrically closing the... | 10/08/1991 |
| 4952858 | Microlithographic apparatus This invention is directed to electro-magnetic alignment apparatus which includes a monolithic stage, a sub-stage, an isolated reference structure, force actuators interposed between the monolithic stage and the sub-stage for suspending and positioning th... | 08/28/1990 |
| 4677381 | Flux-gate sensor electrical drive method and circuit An electrical drive dircuit for a flux-gate magnetic sensor used in a digital compass for a vehicle provides signals for application to the primary of a flux-gate sensor to assure the core is saturated at a predetermined time during each cycle of the driv... | 06/30/1987 |
| 4600883 | Apparatus and method for determining the range and bearing in a plane of an object characterized by an electric or magnetic dipole Orthogonal components of electromagnetic field perturbations due to objects characterized by electric or magnetic dipoles are measured along orthogonal axes in a plane. The components are proportional with (3 cos2 θ-1) and (3 cos θ sin θ), w... | 07/15/1986 |
| 4409529 | Prosthesis A prosthesis comprising: (a) a gripping member; (b) an operating lever mounted to pivot about a pivot axis and operatively connected to the gripping member; (c) a power unit including an electric motor, and a drive shaft rotatable by said electric motor; (d) m... | 10/11/1983 |
| 4321519 | Magnetic field detection device for electronic timepiece An electronic timepiece of the type having a frequency dividing circuit, and a drive circuit for driving a motor having a rotor, a stator and a driving coil, is provided with a magnetic field detection device comprised of a low impedance closed loop inclu... | 03/23/1982 |
| 4321520 | Electronic timepiece An electronic timepiece includes a stepping motor having a stator, a drive coil and a rotor which is driven in one of at least two different states. The state of the driving motor is changed in response to a change in the load of the motor or in response ... | 03/23/1982 |
| 4321521 | Detection device of electronic timepiece An electronic timepiece has a stepping motor comprised of a stator, rotor and driving coil. A wave shaping circuit produces normal driving pulses and correction driving pulses having a longer pulse width than the normal driving pulses. A rotor rotation de... | 03/23/1982 |
| 4232451 | Detector for sensing the angular position of a rotatable magnet A detector to detect angular positions of a rotatable magnet, i.e., a magnetic compass, having one or more flux-sensitive components, namely Hall-elements. The detector includes a substantially flat and circular carrying body to be mounted on the top or b... | 11/11/1980 |
| 4112755 | "Strapdown" induction compass transmitter with means to compensate for heading errors during turns and during dives and climbs due to the vertical component of the Earth's magnetic field and due to two cycle error The invention relates to an apparatus for compensating a "strapdown" induction compass transmitter to eliminate heading errors during turns, and during climbing and diving maneuvers which are due to the vertical component of the Earth's magnetic field as ... | 09/12/1978 |
| 4059064 | Marine auto pilot A marine auto pilot employing a compass with a Hall-effect sensing element in conjunction with a magnetic circuit designed to provide a high intensity magnetic field; electrical circuitry designed to produce high servo-loop gain at frequencies lower than ... | 11/22/1977 |
| 3988658 | Electromagnetic drive assembly for rotary bodies using a magnetically mounted rotor An electromagnetic drive for rotary bodies including a stationary member having at least two coils and a revolving member arranged for rotation with respect thereto. The coils are supplied with a current signal for causing rotation of the revolving member... | 10/26/1976 |
| 3982165 | Apparatus for digitizing and plotting An apparatus capable of digitizing or plotting coordinate locations and lines utilizes an automatically controlled carriage that is translated over the supporting surface of a digitizing and plotting table and a free cursor for identifying specific coordi... | 09/21/1976 |
| 3952681 | Automatic steering system for vessels with a wireless remote control and course change capability An automatic steering system for vessels, operational in a manual mode to select a desired heading, and in an automatic mode to maintain the selected heading. In the manual mode, a magnetic compass incorporated in a servo loop is maintained at a null posi... | 04/27/1976 |
| 3946691 | Autopilot employing improved hall-effect direction sensor An improved marine compass employs a Hall-effect device which provides an output signal related to the relative rotation of the compass card therein. When the Hall-effect device is mounted on a course dial whose position with respect to the compass' lubbe... | 03/30/1976 |
