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Class 318/650 - With current, voltage or electrical power measuring instruments


Subclass of Class 318 - Electricity: motive power systems
Definition: Subject matter in which the error detecting means is a current,
No. of patents: 96
Last issue date: 02/28/2012


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NumberTitleIssue Date
8125173Control system for a lifting device
A control system for a lifting device in which a load moves up or down or maintains its position by a rope that is wound up or down by the rotation of a servo motor. It includes a device for measuring a force, a first controller, a second controller and a switching ...
02/28/2012
8040086Current detector unit and motor control device
A current detector unit has a current detecting portion detecting a current flowing between a three-phase inverter and a direct-current power supply as a detection current; a three-phase current detecting portion for detecting a three-phase current of the inverter b...
10/18/2011
7948199Single-ended gain stage and disk drive
An electrical apparatus comprising an amplifier having a first input, a second input, and an output. The apparatus further comprises a first electrical path coupled to the first input and having a first resistance and a first electrical path coupled to the second in...
05/24/2011
7705554Circuit arrangement and method for adjusting the power consumption of a load that can be operated by a direct-voltage system
A circuit arrangement and a method for adjusting the power consumption of a load of a cooling fan motor of a motor vehicle that can be operated by a direct-voltage system has at least one semiconductor switch in the supply current circuit of the load, and a control ...
04/27/2010
7652446Method for detecting and controlling output characteristics of a DC motor and a self-propelled apparatus using the same
A method for detecting and controlling output characteristics of a DC motor is provided in the present invention, wherein an input impedance related to the DC motor is measured for analyzing the output characteristics of the DC motor so that the output characteristi...
01/26/2010
7439700Control system
A control system which is capable of avoiding an overloaded state of an actuator without using sensors or the like. An ECU 2 of the control system 1 calculates a lift control input U_Liftin to a variable valve lift mechanism 50 with an algorithm...
10/21/2008
7427846Method of optimizing servo controller power in two-dimensional flexure mems storage devices
A method of optimizing a servo controller power required in the operation of two-dimensional flexure (Microelectronic Memory Storage) MEMS devices. Furthermore, provided is an arrangement for optimizing servo controller power in a two-dimensional flexure MEMS storag...
09/23/2008
7423393Car control method and car control apparatus
A car control apparatus including a wheel sensor, wheel torque calculating means for calculating wheel torque from the wheel speed, drive force detecting means for detecting drive force generated by an electric motor, car body drive force calculating means for calcu...
09/09/2008
7421359Detecting back electromotive force voltage
A Bemf detect circuit is configured for modeling Bemf error via calculation of time correlations associated with two or more different non-calibrated sense resistor gain values to derive a calibrated sense resistor gain value. A method is provided for calibrating a ...
09/02/2008
7263905Removable Hall-Effect sensor system for stator windings in a rotating electric machine
A Hall-Effect sensor assembly for a rotating electric machine comprises a thin, removable tubular substrate with Hall-Effect sensors and associated connection wiring mounted on it that slips underneath the wound stator end turns of the stator for the rotating electr...
09/04/2007
7265511Motor control device
A speed controller includes a speed integration compensation low-pass filter, an integral control system, a proportional control system, and a multiplication device means. The speed integration compensation low-pass filter has a transfer function corresponding to a ...
09/04/2007
7256558Brushless motor and disk drive device using the same
A brushless motor according to the present invention provided with a recording disk in a rotational member and serving to rotate the recording disk together with the rotational member comprises a first position detecting means for detecting a rotational position of ...
08/14/2007
7253581Data storage device, motor control device, and motor control method
Embodiments of the invention provide a way to accurately detect the position of a spindle motor. In a spindle motor startup process according to one embodiment, a parameter setup section acquires from a parameter table a sense time value corresponding to an input vo...
08/07/2007
7235952Control apparatus for electrical generator apparatus of motor vehicle
A generator control apparatus, for controlling electrical generation operation of a vehicle alternator, has a LAN circuit and a dedicated communication circuit, respectively communicating with an external control apparatus (e.g., engine ECU) via a LAN and via a dedi...
06/26/2007
7218846Fan speed control circuit
A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and ...
05/15/2007
7185528Speed and fluid flow controller
A system and method for measuring fluid flow rate in a system where fluid is pumped, such as a gas monitoring instrument where gas is pumped from a space such as a room or enclosure through a conduit to a sensor. The flow of gas through a pump is determined by measu...
03/06/2007
7177007Temperature adjustment apparatus, exposure apparatus having the temperature adjustment apparatus, and semiconductor device manufacturing method
An exposure apparatus including an illumination optical unit for irradiating exposure light, a stage for mounting a substrate and moving the substrate, a driving unit for driving the stage, a heater for applying heat to the stage, and a heat generation amount contro...
02/13/2007
7170253Automotive door latch control by motor current monitoring
Latch control methods and systems are disclosed, including a latch that receives power from a motor associated with a latch. A sensor can be provided for monitoring the current consumption of the motor. A microcontroller can control the latch and/or the motor, based...
01/30/2007
7164250Open-loop voltage driving of a DC motor
The driving voltage of the motor is incremented a quantity proportional to the speed of the motor according to a proportionality factor that is adjusted to compensate the back electromotive force. A method includes open-loop voltage control of a DC motor having a ce...
01/16/2007
7161314Motor control apparatus having current supply phase correction
In a motor-driven shift position switching device, when the difference between a target position and the rotation position of a rotor has become smaller than a prescribed value in a motor feedback control, a transition is made to a deceleration control. A phase lead...
01/09/2007
7162656Dynamic protection circuit
According to one embodiment, a computer system is disclosed. The computer system includes an integrated circuits (IC), a power supply that supplies power to the IC and an over-current protection (OCP) circuit. The OCP circuit prevents the exceeding a predetermined p...
01/09/2007
7155328Device and method for determining gearbox positions in an automatic gearbox
A device and a method for determining positions of an automatic gearbox comprises a notched disk (1), an adjustment device for rotating the notched disk (1), a first sensor (14) for measuring the applicable torque, a second sensor (16) fo...
12/26/2006
7145309Open loop motor parking method and system
Provided herewith is an improved scheme for parking a load such as an indicator pointer and calibrating its position in a system for controlling the position of the load. The system also has a stopper for physically impeding the load when it is to be parked. In one ...
12/05/2006
7145304Rotating storage media control loops having adaptive feed forward insertion of signals including harmonics
An adaptive feed forward controller inserts signals into control loops of an optical disc player and/or recorder at a frequency of the rotation of the disc and one or more harmonics thereof, while at the same time maintaining the stability of the control loops. This...
12/05/2006
7141944Device and method for controlling an electrical motor mounted on the crossarm of a bridge circuit
Device for controling an electrical motor mounted on the crossarm of a bridge circuit whose motor current is controllable with semiconductor components formed in a first bridge branch by an electromagnetic switching device and in a second bridge branch by two serial...
11/28/2006
7138782Motor control system and method of the same
The present invention provides a motor control system and method thereof. The motor control system comprises a motor controller and a compensation device. The motor controller is used for generating a motor control output according to a reference signal and a first ...
11/21/2006
7132815Methods and devices for processing servo control signals
Servo control signals and data content associated with two different devices, such as a hard disc drive magnetic head and a digital video disc laser may both be processed without substantial loss of data or control signal errors using a single controller. ...
11/07/2006
7109680Inverter 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
7109672Brushless motor control device and disc apparatus using the same
A brushless motor control device includes a brushless motor including a rotor magnet and a stator coil; rotor position detection means for detecting positions of a plurality of magnetic poles of the rotor magnet; vibration detection means for detecting an unnecessar...
09/19/2006
7106012Electronic control unit, electric power-assisted steering device and transmission ratio-variable steering unit
An electronic control unit for producing a sufficiently boosted voltage even when a supply voltage becomes high includes an inverter that drives switching elements and converts a DC voltage into an AC voltage, and booster means which boosts a DC voltage that is inpu...
09/12/2006
7102318Servo motor with a built-in drive circuit
A servo motor with a built-in drive circuit in which a sensor circuit portion, a drive control circuit portion, and a motor drive circuit are collectively provided on two boards, thereby achieving simplification and a reduction in the size of the circuit configurati...
09/05/2006
7084596Servomotor driving controller
A servomotor driving controller capable of highly accurate machining, which prevents a quadrant projection upon change in the quadrant where machining is made. After the position deviation converges to zero by means of learning control, the velocity command or a dif...
08/01/2006
7075746Disk drives and disk drive containing devices that include a servo frequency generator and spindle control timer that compensate for disk eccentricity
A disk includes an actuator assembly, a spindle motor and a disk that defines a plurality of servo wedges. A wedge to wedge timer is configured to measure the time elapsed between at least two circumferentially adjacent servo wedges and to output a wedge to wedge co...
07/11/2006
7068451Disk drive estimating a sinusoidal error in a wedge time period due to eccentricity in disk rotation
A disk drive and method for estimating a sinusoidal error in a wedge time period is disclosed. An estimated WTP is calculated according to: EST_WTP=RTP+â*cos(2πk/N)+{circumflex over (b)}*sin(2πk/N) wherein RTP is a ...
06/27/2006
7064804Temperature adjustment apparatus, exposure apparatus having the temperature adjustment apparatus, and semiconductor device manufacturing method
An exposure apparatus having an illumination optical unit for emitting exposure light, a stage for supporting a substrate, and a main controller for controlling exposure operation of transferring a pattern formed on a master to the substrate. The apparatus includes ...
06/20/2006
7057836Disk drive servo controller utilizing an extended servo header
A disk drive includes a moveable head and a disk having a circumferential track which includes a plurality of servo wedges. The servo wedges are spaced sequentially around a circumference of the circumferential track. Each servo wedge includes an extended servo head...
06/06/2006
7053583Brushless DC motor control
A method and control system to control a brushless DC motor to a preferred position is provided. The advantages that accrue to a system employing the method and apparatus to control the brushless DC motor to a preferred position include optimizing response time, ene...
05/30/2006
7042188Servo motor with a built-in drive circuit
A servo motor with a built-in drive circuit is provided in which, when power is off, positional data including multiple-rotation counting values is stored in a nonvolatile memory to thereby eliminate battery back-up, and in which the CPU of a drive control circuit p...
05/09/2006
7016775Controller and control method for an electric power steering apparatus
A controller controls an electric motor to provide assist power corresponding to steering operation for an electric power steering apparatus. The controller comprises a detecting device, a filtering device, a judging device and a determining device. The detecting de...
03/21/2006
7007762Power tool
It is an object of the present invention to provide a technique to increase efficiency of the output torque of the blushless motor to drive a power tool. A representative power tool may comprise a tool bit, a brushless motor to drive the tool bit, a battery to opera...
03/07/2006
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