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| Number | Title | Issue Date |
| 7164969 | Apparatus and method for patient rounding with a remote controlled robot A method for remotely monitoring a patient. The method includes generating and transmitting input commands to the robot from a remote station. The remote station may include a personal computer that is operated by a doctor. The input commands can move the robot so t... | 01/16/2007 |
| 7138780 | Process for the control of the position of workpiece and tool with a robot in a production machine The invention relates to a process for the control of the position of workpiece and tool with a robot in a production machine. The objective of the invention is to reduce non-productive secondary processing time during the processing or measuring of a workpiece with... | 11/21/2006 |
| 7082010 | Method and apparatus for reducing seek acoustics in a disk drive using feedback during large current transitions A method and apparatus for reducing seek acoustics in a disk drive using feedback during large current transitions is provided. A desired transition profile, which uses feedback, is followed in order to smoothen transitions of a commanded current profile that is sup... | 07/25/2006 |
| 6936987 | Method for controlling an electric motor driving a body in translation The invention concerns a method for controlling an electric motor driving a body in translation between an initial position and a final position determined by a stop, by powering the motor with reduced voltage in the final position approach phase. The motor has a to... | 08/30/2005 |
| 6563283 | Motor control device Where high control precision is required in contour control or the like, mode B for a short PWM period is selected to assure a high control precision. Where high torque is required in fast feed, high acceleration or deceleration, mode A for long PWM perio... | 05/13/2003 |
| 6333615 | Synchronization control device for servo motors Position droops produced in main and auxiliary servo motors when main and auxiliary spindles are coupled to each other through a workpiece are obtained by adders, respectively, a difference between those position droops is obtained by a comparator before ... | 12/25/2001 |
| 6316900 | Single shaft type table feed device A single shaft type table feed device comprises a movable body and an auxiliary movable body 34. The movable body is supported by a guide rail 31 and can be freely moved by a feed screw shaft 35 in the axial direction thereof. The auxiliary movable body 3... | 11/13/2001 |
| 6281652 | Method of using two low-resolution DACS for converting high-resolution digital demands into analog output signals that monotonically drive an actuator motor in a disk drive Disclosed is a method in a disk drive that allows the functionality of a single high-resolution DAC to be replicated with a pair of lower-resolution DACs that are operated in a unique manner that provides monotonic behavior and reduces both differential a... | 08/28/2001 |
| 6191548 | Single shaft type table feed device A single shaft type table feed device comprises a movable body and an auxiliary movable body 34. The movable body is supported by a guide rail 31 and can be freely moved by a feed screw shaft 35 in the axial direction thereof. The auxiliary movable body 3... | 02/20/2001 |
| 5559413 | Screw shaft feed mechanism and positioning control method therefor A screw shaft feed mechanism includes a screw shaft (25) rotatably supported by a frame (19) and extending in a shaft feed direction of a work table (shaft fed base) (1); a nut member (39) rotatably supported by the work table (1) and engaged with the scr... | 09/24/1996 |
| 5543697 | Circuit and method for controlling the speed of a motor A method and circuit for implementing a frequency lock loop circuit in a disk drive is disclosed. The circuit includes the motor control elements of a direct current motor plus a coarse counter, a fine counter, and a digital to analog converter. The coars... | 08/06/1996 |
| 5530331 | Encoder, servo system and industrial robot An encoder for indicating a position of a movable member and for generating at least two signals which are offset in phase from one another in accordance with movement of the movable member. The encoder includes a position detector and a presettable count... | 06/25/1996 |
| 5404308 | Numerical control (NC) device to control feed speed of tool based on speed of spindle and amount of change of spindle speed An numerical control (NC) device capable of machining a workpiece with high accuracy by accurately commanding a feed speed of a tool, even if a sudden change occurs in an actual speed of a spindle motor. If a rotational speed of a spindle changes, a chang... | 04/04/1995 |
| 5267142 | Method for phase-synchronized spindle rotation control A spindle rotation control method is provided capable of driving two spindles of a machine at the same speed with the same rotational phase. In response to a synchronizing control command from a numerical control apparatus, speed control is performed base... | 11/30/1993 |
| 4965501 | Servo circuit A servo circuit having a speed detection circuit for detecting a real speed from a position signal from an object under servo control; a speed error detection circuit for generating a speed error signal between a target speed and the real speed; a positio... | 10/23/1990 |
| 4647827 | Absolute position detecting system for servocontrol system An absolute position detecting system for a servocontrol system which has its operation controlled in accordance with a numerical control program. Resolvers 202 and absolute encoders 110 made rotatable with a servomotor 105, are set at a predetermined rev... | 03/03/1987 |
| 4325013 | Electrical tracer control system utilizing sine wave resolution A control for a profiling machining tool, and a method for controlling such a tool. The machine tool includes a sensing head which moves along a template or pattern to produce a signal that causes motors relatively to shift a cutting tool and a workpiece ... | 04/13/1982 |
| 4207505 | Measuring system A system for measuring the displacement of a workpiece from a reference coordinate system. Position information with respect to the various axes of the coordinate system is acquired by rotary resolver assemblies that measure the angular position of rotata... | 06/10/1980 |
| 4093903 | Apparatus for extending the linear signal range of a rotary transformer type device The linear signal output range of a rotary transformer type device, such as a sine/cosine synchro, is considerably extended beyond its normal 45° linear range by electronic circuit means. Specifically, the electronic circuit means utilizes the sine signa... | 06/06/1978 |
| 4021714 | Servo system employing a tracking digital angle encoder An absolute positioning servo for positioning a shaft in response to a digital command input which utilizes a resolver, for providing an analog position indication of the shaft, an analog to digital converter, which provides a digital indication of the sh... | 05/03/1977 |
