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| Number | Title | Issue Date |
| 7446497 | Fixed-position stop control apparatus for rotation shaft A fixed-position stop control apparatus (10) includes: a move-instruction generating means (22) for generating a move instruction for each control cycle; a position loop control means (25) for position controlling a rotation shaft (61) fo... | 11/04/2008 |
| 7420349 | Microcontroller interface with hall element A device controller system incorporates an inexpensive Hall element to detect motion of a brushless DC motor. A magnet, which is part of a motor rotor, passes by the Hall element producing a Hall voltage each rotation. The Hall voltage is coupled through an interfac... | 09/02/2008 |
| 7268710 | Logic device for the transformation of the output of the RDC into series A-B pulses A logic device for the transformation of the output of the RDC into series A-B pulses according to the present invention comprises: a chip with its two minimal bits (LSB-LSB-1) simulating as the clock source of A-B pulses, a signal-processing pin (BUSY) which... | 09/11/2007 |
| 7269677 | Power consumption reduction and quicker interruption response in an information processing device utilizing a first timer and a second timer wherein the second timer is only conditionally activated An information processing device having low power consumption without affecting interruption request response speed. The device specifies a waiting time until execution of a given event and makes a system call and includes a first timer circuit for a first cycle; a ... | 09/11/2007 |
| 7227328 | Method for detecting a possible collision of at least two objects moving with respect to each other A method is for detecting a possible collision of at least two objects moving with respect to each other by simulating the intended relative motion of the two objects. At least one of the objects is assigned an envelope surrounding the object, the path line represen... | 06/05/2007 |
| 7171718 | Direct drive windshield wiper assembly A windshield wiper assembly including at least one motor having an output shaft and a windshield wiper operatively connected to the output shaft. The motor includes a stator adapted to provide an electromagnetic flux and a rotor assembly supported for rotation about... | 02/06/2007 |
| 7102316 | Mechanical press In a press having a plunger supported so as to be movable linearly back and forth by drive means which include at least one servomotor in combination with a rotatably supported inertia structure connected for rotation with the servomotor, the inertia structure has a... | 09/05/2006 |
| 7091884 | Analog position encoder A position-measuring circuit is described for use with an analog position encoder of the kind comprising a code member and at least two sensors for sensing successive marks on the code member during relative movement between the code member and sensors, the sensors ... | 08/15/2006 |
| 7081730 | Motor controller system for large dynamic range of motor operation A motor controller system uses a rotary sensor with a plurality of signal conditioning units, coupled to the rotary sensor. Each of these units, which is associated with a particular range of motor output shaft rotation rates, generate a feedback signal indicative o... | 07/25/2006 |
| 7079459 | System and method for performing a spin motor startup operation A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The present invention includes starting the operation of a motor including windings and a rotor; placing the motor in ... | 07/18/2006 |
| 7062160 | Monitoring current in a motor during acceleration to verify motor frequency lock Method and apparatus for accelerating a motor from an intermediate velocity to a final operational velocity. The motor is accelerated from rest to the intermediate velocity through application of fixed duration drive pulses to the spindle motor. Once the motor reach... | 06/13/2006 |
| 7057364 | Actuation system comprising a digital position sensor An actuating system having an electric motor that is controlled by a computer as a function of a setpoint position of a member that is to be actuated. The actuating system includes an encoder that is dependent on the movement of the motor, a sensor designed to deliv... | 06/06/2006 |
| 7049784 | Drive voltage generating apparatus and method for controlling the same A first drive voltage generating section corresponds to a first motor, and a second drive voltage generating section corresponds to a second motor. Each of the first drive voltage generating section and the second drive voltage generating section includes switching ... | 05/23/2006 |
| 7012397 | Encoder and control apparatus for motor In a control apparatus, a “characteristic value calculation” block calculates a characteristic value (such as amplitude value, offset value, or waveform distortion for each phase of two-phase sinusoidal signals optically input from an encoder, or phase differenc... | 03/14/2006 |
| 7005821 | Servomotor controller In a servomotor controller, when a comparing circuit (70) detects that a position of an object to be controlled has been achieved to a target position, an operation inhibiting signal generating section (71) supplies an operation inhibiting signal (7... | 02/28/2006 |
| 6954096 | Semiconductor integrated circuit device having a sampling signal generation circuit A semiconductor integrated circuit device is provided to reduce the adverse effect of PWM noise occurring in a PWM driving section on an analog voltage processing section in an IC, in which digital and analog circuits are combined on a single chip. A sampling signal... | 10/11/2005 |
| 6944906 | Direct drive windshield wiper assembly A direct drive windshield wiper assembly including at least one brushless DC motor providing a drive torque through an output that is rotatable about the longitudinal axis of the motor and a windshield wiper that is driven by the motor about the longitudinal axis in... | 09/20/2005 |
| 6940252 | DC motor control method and apparatus A DC motor control method and apparatus for reducing time required for deceleration without degrading positioning accuracy. In a device which drives a mechanism by using a DC motor as a power source, in deceleration of the DC motor, when the mechanism arrives at a p... | 09/06/2005 |
| 6941035 | Optical cross-connect switch An optical cross-connect switch is disclosed for switching optical communication signals between any of a plurality of input optical channels and any of a plurality of output optical channels. The switch comprises a first pattern projector configured to project one ... | 09/06/2005 |
| 6838849 | Serially connected double-phase full-wave brushless dc motor A serially connected double-phase full-wave brushless dc motor includes a first drive member, a second drive member, a first sensor member, a second sensor member, a first motor coil and a second motor coil. The first drive member is connected to a power source to t... | 01/04/2005 |
| 6791293 | Sensorless control device for synchronous electric motor The invention provides a synchronous motor sensorless controller which drives a synchronous motor without use of a rotational position sensor. The controller has a relative position counter 4 which acquires an estimated position of a magnetic pole from the po... | 09/14/2004 |
| 6756762 | Method and actuation control for stopping an electrical drive, by means of closed-loop position control, in a predetermined nominal position The invention reduces the oscillation of the rotation speed regulator when stationary—despite low position resolution and a high minimum rotation speed resulting from this—by switching the closed-loop control structure, when the drive is moved into the nominal p... | 06/29/2004 |
| 6727669 | Motor-driven power steering apparatus A motor-driven power steering apparatus includes a motor for generating assisting force to be imparted to a steering mechanism, a control signal generation section for generating a motor control signal on the basis of at least steering torque applied to a steering w... | 04/27/2004 |
| 6707269 | Motor control circuit with adaptive dynamic range selection Method and apparatus for controlling a motor. A digital to analog converter (DAC) converts input digital values to corresponding analog voltages over a range of different selectable dynamic operating ranges. A first motor adjustment signal within a first dynamic ran... | 03/16/2004 |
| 6683437 | Current controlled motor amplifier system Aspects of a current controlled motor amplifier system are provided. These aspects include a current source motor amplifier comprising current source means on each leg of a top half of the H bridge configuration and switching means on each leg of a bottom... | 01/27/2004 |
| 6677721 | Method of control and control structure for the movement control, pre-control and fine interpolation of objects in a speed controller clock which is faster than the position controller clock The invention makes it possible to execute the pre-control and the fine interpolation in the drive (A) in the fast drive clock (tDR) with a slower path pre-setting in the clock (tNC) of the NC. For this purpose, in each NC clock (tNC) a setpoint speed val... | 01/13/2004 |
| 6611122 | Method of control and control structure for the movement control, pre-control and fine interpolation of objects in a speed controller clock which is faster than the position controller clock The invention makes it possible to execute the pre-control and the fine interpolation in the drive (A) in the fast drive clock (tDR) with a slower path pre-setting in the clock (tNC) of the NC. For this purpose, in each NC clock (tNC) a setpoint speed val... | 08/26/2003 |
| 6597142 | Apparatus and method for setting control parameters of machining apparatus An apparatus for setting control parameters of a machining apparatus. The setting apparatus includes a storage unit for storing a set of control parameters for each of a plurality of machining modes; an input device for selecting one of the plurality of m... | 07/22/2003 |
| 6304077 | Method and apparatus for defining the position of an actuator utilizing parts of pulse intervals The invention relates to a method and an apparatus for defining the position of an actuator. The position of the actuator (1) is measured by a measuring signal (3) proportional to the rotation of a shaft (6) of the actuator (1). The measuring signal (3) c... | 10/16/2001 |
| 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 |
| 6262552 | Method of positioning an actuator The invention relates to a method for positioning an actuator. In the method, the actuator is controlled by a continuous control pulse (2a) toward a desired value (1), and the position of the actuator is measured. Further, a pulsing range limit located be... | 07/17/2001 |
| 6066929 | Frequency generator circuit for a brushless DC motor control system A brushless direct current motor driving circuit includes a data generator adapted to receive a first signal corresponding to a rotor position and to generate a digital data signal therefrom, a clock signal generator adapted to receive phase voltage signa... | 05/23/2000 |
| 6013996 | Precision stop control for motors An improved stop control system and method are provided for a motor having a drive mechanism in which the motor is coupled to a motor controller that controls the speed and position of the drive mechanism using a first signal indicative of a commanded pos... | 01/11/2000 |
| 5673467 | Machine tool assembly A machine tool assembly having a rotatable element for driving a tool to operate on a workpiece and structure for driving the rotatable element in rotation. The driving structure has a first power source and first structure cooperating between the first p... | 10/07/1997 |
| 5625310 | Signal processing apparatus and displacement detecting apparatus using the same A signal processing apparatus is provided for processing first and second periodic analog signals having the same period and having a fixed phase relationship therebetween. The apparatus includes an A/D converter for converting respective amplitudes of th... | 04/29/1997 |
| 5583409 | Numerical control apparatus and method for controlling a machine A numerical control apparatus allows a portion of a prototype or the like to be easily machined without an operator being concerned with a coordinate system, origins, and other data. A guidance function executing unit displays guidance information on a di... | 12/10/1996 |
| 5543696 | Position control for hybrid servomechanisms A hybrid servomechanism includes a speed control, a rotor position control and a brushless motor. When enabled, the position control commands a stationary stator mmf vector, allowing the motor's rotor to rotate until load torque and motor torque are balan... | 08/06/1996 |
| 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 |
| 5519297 | Spindle positioning method A spindle positioning method for high-speed positioning of a spindle by making the best use of the decelerating capability of a spindle motor. When a fixed-position stop command is generated while the operation of the spindle motor is controlled according... | 05/21/1996 |
| 5289095 | Fuzzy switching logic for servo systems An actuator'rate is controlled by a rate servo and the actuator's position is controlled by a position control. The position control can be a position servo or a mechanical brake. Selection of either the rate servo or position control is made by fuzzy swi... | 02/22/1994 |
