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| Number | Title | Issue Date |
| 7583043 | Apparatus, system, and method for controlling speed of a cooling fan An apparatus, system, and method are disclosed for controlling fan speed. A power sensing module senses input voltage and current of a power supply. The power supply includes one or more stages and regulates at least one output bus. A power calculation module calcul... | 09/01/2009 |
| 7292400 | Device for limiting current in a sensor A read/write device for a disk drive is disclosed. The read/write device includes a pre-amplifier and a recording head. The read/write device also includes a write signal path between the pre-amplifier and the recording head. The write signal path includes a write c... | 11/06/2007 |
| 7291995 | Air fan rotation speed control method and structure thereof An air fan rotation speed control method and a structure thereof aim to provide an automatic control mode and a manual control mode at the same time to control rotation speed regulation of an air fan to achieve instant heat dissipation for an environment and reduce ... | 11/06/2007 |
| 7211971 | Linear actuator A linear actuator having a housing, a plunger slidably mounted to the housing between an extended and retracted position, and an electric motor drivingly connected to the plunger to move the plunger between its extended and retracted positions. A motor circuit contr... | 05/01/2007 |
| 7202624 | Self calibrating fan A self-calibrating, continuous variable speed fan for use in cooling electronic circuitry is disclosed. Upon initial power-up, in an environment of known temperature, the self-calibrating fan accommodates for the tolerances of its electronic components by reading a ... | 04/10/2007 |
| 7196863 | Apparatus and method for controlling head unload operation in disk drive An actuator supports a head such that the head is movable in a radial direction of a disk. The actuator has a voice coil motor (VCM) used as a driving source for the actuator. A voice coil motor driver (VCM driver) supplies the VCM with a driving current for driving... | 03/27/2007 |
| 7189145 | Method of and apparatus for producing roll A belt grinding is integrated with an electroerosion machine for contouring the working surface of a mill roll and providing a texture thereon. The belt grinder can superfinish the roll and remove peaks in the surface without significantly affecting the mean surface... | 03/13/2007 |
| 7166978 | Motor temperature sensor system and method to determine motor performance An electric motor system includes an electric motor, a temperature sensor mounted therein capable of measuring a local temperature and generating a temperature related signal, and a processor configured to calculate an actual temperature of a rotor magnet from the t... | 01/23/2007 |
| 7109680 | Inverter device An object is to provide an inverter device capable of realizing exact protection of the winding of a motor. An inverter device for generating a pseudo alternating current by switching a direct current to drive a motor, comprises a controller that executes vector con... | 09/19/2006 |
| 7029239 | Piecewise linear control of the duty cycle of a pulse width modulated signal A system may include a PWM generator and control logic. The PWM generator is configured to generate a PWM signal having a duty cycle dependent on a duty cycle value generated by the control logic. The control logic is configured to generate the duty cycle value to h... | 04/18/2006 |
| 6979971 | Control device-built-in cylinder servo motor An operation command for constructing compensation data is generated in a control device, and measurement data obtained from an external length measuring device is input to an input unit. The measurement data is compared with an estimated position in a control devic... | 12/27/2005 |
| 6975047 | Temperature-based cooling device controller apparatus and method A temperature-based cooling device controller is implemented in an integrated circuit such as a microprocessor. The temperature-based cooling device controller includes a register to store a threshold temperature value, a thermal sensor, and clock adjustment logic t... | 12/13/2005 |
| 6906485 | Spindle motor control using a current profile to taper current transitions Method and apparatus for operating a motor. During a commutation state current is applied to a motor while field effect transistors (FETs) are held in an enable or disable state to effect current in phases of the motor. The phases have a high FET and a low FET. Cont... | 06/14/2005 |
| 6901682 | Rotation angle detecting apparatus and its rotary disc A rotary disc made of synthetic resin has a fixed portion fixed to a rotary shaft, a cylindrical portion extending in the thrust direction from the outer peripheral edge of the fixed portion, and a disc main body portion extending in the radial direction from the lo... | 06/07/2005 |
| 6791785 | Disk drive with efficient coil temperature estimation A controller for a disk drive that accesses a look up table having a plurality of thermally characterized values corresponding to a plurality of seek operations. For each seek operation, the corresponding value is added to a register. The controller decrements the r... | 09/14/2004 |
| 6748298 | Method for limiting the force action of a robot part In order to reduce the risk of damage on external objects, material articles or persons during the operation of a robot, particularly a miniature robot, the invention provides a method for limiting the force action of a robot part, such as a robot arm, on such an ex... | 06/08/2004 |
| 6534945 | Creel for a textile machine producing cheeses A creel (18) for a textile machine (1) producing cheeses (11), with a drive device (27) integrated into the creel (18) having an electromotor (35) which can be loaded with a braking current for braking the cheese (11) by initiating a braking moment direct... | 03/18/2003 |
| 6291958 | Temperature limiting controller for electric machines A method (10, 30) for actively controlling the temperature (tmotor) of an electric machine operating under torque (T*), speed and/or position control. A controlled output (T*), i.e. torque command, voltage, current or power, is adjusted such th... | 09/18/2001 |
| 6282380 | Position control apparatus, focus adjustment apparatus and camera A position control apparatus includes a stepping motor, a lead screw arranged to be rotated by the stepping motor being driven, a moving member arranged to move according to rotation of the lead screw, a first detecting device which detects that the movin... | 08/28/2001 |
| 6229275 | Semiconductor integrated circuit device for use in a disk drive A semiconductor integrated circuit device 1 for use in a disk drive has a temperature detection section 9 that detects the temperature inside the semiconductor integrated circuit device 1 to switch a signal TSD between high and low levels when a predeterm... | 05/08/2001 |
| 6054829 | AC motorized wheel control system Torque is distributed by calculating first and second torque commands using a requested torque and a ratio of speeds of first and second wheels and limiting them in accordance with respective torque command approved ranges and approved change rates; conve... | 04/25/2000 |
| 6023145 | Head and disk tester with a thermal drift-compensated closed-loop positioning system The head/disk tester of the invention has a housing 43 that houses spindle 44 that rotatingly supports a magnetic disk 31. The housing supports a moveable carriage 30 that, in turn, supports a magnetic head 32. Positioning means 39 and 41 are used to move... | 02/08/2000 |
| 5845045 | Method and apparatus for DC motor speed control A memory device, e.g. a capacitor, is provided for a collectorless DC motor. This component is charged whenever a particular rotor position is reached. In so doing, a voltage value or quantity on this memory device is changed. This quantity is compared to... | 12/01/1998 |
| 5833407 | Method for estimating heat-included displacment in a machine tool There is provided a method for estimating the thermal displacement of a component of a machine tool comprising the steps of detecting the temperature of at lease one rotatable component of a machine tool having a variable rotational speed and a variable t... | 11/10/1998 |
| 5821715 | Pulsed alignment commutation state for sensorless motor start A start-up controller is programmed to reduce current to a motor during a coast phase of an alignment state of the motor. The alignment state is divided into a plurality of phases based on time elapsed from the start of the alignment phase and the control... | 10/13/1998 |
| 5808438 | Method and system for limiting current in a read/write head retract circuit A method and system for limiting current in a read/write head retract circuit is disclosed. The system includes a temperature sensor (75) for sensing a temperature of the disk drive read/write head retract circuit (53). The temperature sensor (75) generat... | 09/15/1998 |
| 5633568 | Method and apparatus for dynamic low voltage spindle motor operation A spindle motor operates dynamically in one of two modes for a disc drive. During power-up, the disc drive electronics are configured to operate the motor in a line-to-line configuration, thus assuring generation of adequate torque. An operating condition... | 05/27/1997 |
| 5619414 | Thermal displacement correcting method of machine tool A method of correcting thermal displacement error in a driving system of a machine tool comprises forming a heat distribution model including the driving system, and finding an amount of drive in the driving system in the heat distribution model, estimati... | 04/08/1997 |
| 5525885 | Position detecting apparatus and position compensating method therefor A revolution detecting apparatus which detects and outputs a compensated revolution position adjusted according to compensation values, stored according to the ranges of a rotation position indicated on the basis of the number of revolutions of a motor fo... | 06/11/1996 |
| 5420490 | Apparatus and method for compensating for warm-up drift in a servo motor A register stores the value from the integral controller of the PID controller whenever it receives a feedback signal. A main controller outputs a warm-up drift compensation value whenever the servo motor is at a standstill. An arithmetic unit calculates ... | 05/30/1995 |
| 5363025 | Actuator employing unidirectional motor for bidirectional rotational positioning An actuator employing a unidirectional electric motor driving a first rotating member connected to a second rotating member through a pivotable link of which a first end is connected to the first rotating member at a smaller distance from its axis of rota... | 11/08/1994 |
| 5239331 | Brake device for motor in camera A device for braking an electric motor as the drive source of an operating mechanism in camera by means of an electrical circuit is disclosed. This circuit includes a detector for levels of the rotation speed of the motor or of factors of influencing the ... | 08/24/1993 |
| 5111348 | Magnetic head including thermoelectric positioning means A thermoelectrically adjustable magnetic head for reading and writing information comprising a read/write core, and position detection cores on both sides thereof generating compensatory output in proportion to the relative positional drift of the magneti... | 05/05/1992 |
| 5093607 | Industrial robot system An industrial robot system comprises a control unit including programs for operating an industrial robot and a peripheral device of the industrial robot according to the programs; a memory for storing the steps of the programs which are effected when the ... | 03/03/1992 |
| 5021722 | Composable protection and control apparatus for motors A composable protection and control apparatus for motors is provided with a power case including semiconductor switches controlling the switching on and off of the power of the phase currents as well as a detector for detecting all or part of these curren... | 06/04/1991 |
| 5014335 | Method of controlling at least one electric motor on an offset printing machine Method of controlling at least one electric motor on an offset printing machine by inputting a set point for the rotational speed, which comprises forming a set point for the rotational speed by means of a device for controlling the electric motor, and re... | 05/07/1991 |
| 4926077 | Resistance compensation in a motor using a thermally variable resistive network A motor is disclosed comprising a housing and a plurality of parallel stator laminations mounted on the interior wall of the housing surrounding the rotor. The stator comprises a plurality of coils wound around the stator poles. Each coil or group of coil... | 05/15/1990 |
| 4919575 | Apparatus for compensating for the thermal displacement of the main spindle of a machine tool A thermal displacement compensating apparatus capable of compensating for the thermal displacement of the main spindle of a machine tool is disclosed. A feed back scale and a measuring head are provided in order to detect the actual position of the front ... | 04/24/1990 |
| 4849840 | Carriage device for floppy disk apparatus having head arm with regulating material A carriage device of a floppy disk apparatus includes a carriage main body arranged for linear movement and a head arm extending parallel to the main body. The body and arm are formed of synthetic resin. First and second magnetic heads are respectively mo... | 07/18/1989 |
| 4814908 | Thermo servo for track centering on a disk An apparatus and method for positioning a transducer over the center of a track is disclosed. An arm carries the transducer. Embedded in the arm is a heating element. The heating element is positioned so that the linear expansion or contraction of the arm... | 03/21/1989 |
