Did You Know...
...that the Band-Aid Bandage was invented by a Johnson & Johnson employee whose wife had cut herself? Earl Dickson's wife was rather accident prone, so he set out to develop a bandage that she could apply without help. He placed a small piece of gauze in the center of a small piece of surgical tape, and what we know today as the Band Aid bandage was born!
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| Number | Title | Issue Date |
| 8179075 | Motor driving integrated circuit A motor driving integrated circuit comprising: a speed control circuit configured to control a rotation speed of a motor according to a speed control signal; a detecting circuit configured to detect whether the speed control signal indicates stop of rotation of the ... | 05/15/2012 |
| 8174222 | Methods, systems and apparatus for dynamically controlling an electric motor that drives an oil pump Methods, system and apparatus are provided for sensorless control of a vector controlled motor drive system that includes an electric motor used to drive an auxiliary oil pump. ... | 05/08/2012 |
| 8159172 | Method for controlling an electric motor by using the PWM technique A method for controlling an electric motor by using the PWM technique including the steps of: applying to the clamps of the electric motor an electric voltage varying in time, which displays a square waveform and consists of a sequence of pulses having a uniform wav... | 04/17/2012 |
| 8159171 | Controller and method for adaptively adjusting motor driving current waveforms The present invention discloses a controller and a method for adaptively adjusting motor driving current waveforms. According to the present invention, the controller receives multiple different control parameters which may be determined according to the characteris... | 04/17/2012 |
| 8143835 | Method of driving DC/DC converter, method of controlling DC/DC converter apparatus, method of controlling driving operation of vehicle, and method of driving fuel cell system Under the same target voltage, a basic duty ratio depending on a target ON time is set, and prior and subsequent duty ratios before and after upper arm switching devices or lower arm switching devices are driven with the basic duty ratio are set as a basic duty rati... | 03/27/2012 |
| 8134326 | Motor drive apparatus and method for electric power steering system In a motor drive apparatus for an EPS motor, which provides steering assist torque in an electric power steering system, a three-phase inverter applies three phase-voltages to the EPS motor, and a controller controls the three-phase inverter. The controller drives t... | 03/13/2012 |
| 8134327 | Phase current measurements in a three phase inverter using a single common DC-link current sensor A method for measuring current in each phase of a three-phase inverter driven motor is based on the three-phase inverter being controlled in a PWM mode by three PWM signals including the use of a common DC-link current sensing resistor. The current on the sensing re... | 03/13/2012 |
| 8120296 | Motor magnetic pole position detecting device A motor magnetic pole position detecting device includes a detection current command generation unit generating a detection AC current command, a current detection section detecting a current flowing into the motor, a coordinate conversion unit vector-converting the... | 02/21/2012 |
| 8111030 | Motor control apparatus and motor control method A motor control apparatus and a motor control method determine whether the motor is in a back-pressure area so as to provide different rotation-speed control signals. When the fan is in the low duty cycle, a first circuit loop is switched on, so that the fan has mor... | 02/07/2012 |
| 8106617 | Motor power-management protection method and circuit A power management protection circuit and method provides for a fast, real-time hardware logic control of the power control components of a motor, whereby the over-current condition is an integral of the over-current level and over-current time duration, and provide... | 01/31/2012 |
| 8102135 | Motor and drive control system thereof Provided is a motor having a magnetic polar unit in which a permanent magnetic polar array having arranged therein alternately a plurality of permanent magnetic polar elements in alternate opposite poles is made to face a plurality of electromagnetic coil arrays alt... | 01/24/2012 |
| 8093854 | Fan speed control system A system for controlling the fan speed is described. Specifically, one embodiment of the present invention set forth a computing system, which includes a first processing unit including a first sensor, wherein the first processing unit is configured to generate a fi... | 01/10/2012 |
| 8084973 | Motor driving circuit A motor driving circuit generates pulse driving signals, and controls the ON/OFF state of a switching circuit connected to a coil of a motor which is to be driven, thereby controlling the conduction period of the motor. A driving signal generating circuit generates ... | 12/27/2011 |
| 8076890 | AC motor driving apparatus and control method Provided is an AC motor driving apparatus and an AC motor control method capable of utilizing the conventional PWM system as-is even in an ultra-compact AC motor having an extremely few turns of exciting coil and preventing occurring of vibration and noise. The AC m... | 12/13/2011 |
| 8049456 | Dynamoelectric machine assemblies operable with serial communication signals and PWM control signals A dynamoelectric machine assembly for connection to a system controller. The assembly includes at least one input contact for receiving a control signal from the system controller and a processor coupled to the input contact. The processor is configured to operate t... | 11/01/2011 |
| 8030874 | Power converting apparatus To reduce, in a power converting apparatus for an electric locomotive, a sixth-order harmonic noise induced by a torque ripple component equivalent to a sixth-order frequency of an inverter frequency. When a motor is driven in a three-pulse mode to drive the electri... | 10/04/2011 |
| 8026682 | Circuit arrangement The invention specifies a circuit arrangement (1, 20) for controlling a brushless electric motor (37) with a control chip (2), particularly a microcontroller, which has a number of PWM contacts (8), which can be used to output a PWM signa... | 09/27/2011 |
| 8018184 | PWM control circuit and PWM control method The PWM control circuit includes a polarity determination unit, a full wave rectification unit, an adjustment unit that generates an adjusted waveform signal by adjusting waveform of the full wave rectification signal, and a carrier signal generating unit that gener... | 09/13/2011 |
| 7936142 | Portable drilling device A drilling device prevents recurrence of an overload condition after occurrence of the overload condition, thereby improving operability and safety in the drilling device. A motor for rotating a drill is connected to an AC power source through a motor control unit, ... | 05/03/2011 |
| 7928676 | Vehicle motor control apparatus There is provided a vehicle motor control apparatus that alternately switches a first ON state in which one of the stator winding terminals is energized through an upper switch element group and another stator winding terminal is energized through a lower switch ele... | 04/19/2011 |
| 7911166 | Polyphase rotating machine equipped with an improved control device A machine comprising a rotor, a stator (12), a control bridge (10) with controlled switches, and a control device (20, 30) supplying control signals (C) to the control bridge (10), wherein the control device comprises means (30) fo... | 03/22/2011 |
| 7906929 | Method and device for controlling a three-phase machine having several phase windings, which can be controlled by means of pulse width modulation An aspect of the invention is a method and a device for controlling a rotating field machine having several phase windings, which can be controlled by means of pulse width modulation, wherein a pulse width modulation controller is adapted in such a way that an indiv... | 03/15/2011 |
| RE42113 | Control system of motors for rotating a disk and for positioning heads of a mass storage disk device An integrated control and power driving system moves a read/write head carrying arm over the surface of a disk. The integrated control and power driving system is applicable to a spindle motor, a mass storage disk drive and a voice-coil motor, for example, and inclu... | 02/08/2011 |
| 7872435 | Motor control apparatus A motor control apparatus provided with an inverter for successively commutating the current to a motor using a PWM signal; a PWM signal generating device for generating the PWM signal using a carrier signal; a rotational state quantity sensor for detecting a rotati... | 01/18/2011 |
| 7852032 | AD conversion control circuit and related arts A selector selects an analog signal group to be used for PWM control out of a plurality of analog signals output by a PWM controlled load. An AD converter AD converts the analog signal group and generates a digital signal group that becomes control data for duty rat... | 12/14/2010 |
| 7847507 | Zero-current notch waveform for control of a three-phase, wye-connected H-bridge converter for powering a high-speed electric motor A zero-current, synchronous switching waveform is provided for a three-phase, wye-connected H-Bridge to power an electric motor. The switching waveform includes two notches per cycle on the switching waveform provided to each of the semiconductor switches to minimiz... | 12/07/2010 |
| 7847508 | Heat dissipation system A heat dissipation system for an electronic device comprises a base, a fan, a pulse width modulation speed control circuit controlling the speed of the fan, a converter outputting a voltage signal, a selection switch connected to the motor, and a control element pro... | 12/07/2010 |
| 7839103 | Adjustable frequency PWM driver A driver for a motor in a device includes a reference generator to generate a reference value. A clock management module receives a plurality of clock signals. Each clock signal has a corresponding frequency that is different relative to the corresponding frequency ... | 11/23/2010 |
| 7830104 | Brushless motor The brushless motor includes a coil array, a magnet array, a magnetic sensor, a drive control circuit for driving the coil array, and a temperature sensor for detecting a detection target temperature associated with either the coil temperature or the driving element... | 11/09/2010 |
| 7804266 | Motor control device A motor control device includes a current detecting portion that detects current flowing between an inverter for driving a three-phase motor and a DC power supply for supplying DC voltage to the inverter, a current estimator that estimates a current vector of the mo... | 09/28/2010 |
| 7791304 | Method and device for determining the duty-cycles of PWM control signals of an inverter A method for determining duty-cycles of respective pulse width modulated (PWM), space vector modulated (SVM) control signals of an inverter, may include storing values of the duty-cycles as a function of a position of the multi-phase electric load in a look-up table... | 09/07/2010 |
| 7786690 | Motor control apparatus The present invention restrains high frequency leakage current while reducing ripples of current flowing through a motor having one set and another set of independent phase windings. A plurality of inverter type drive means drives the respective phase windings and a... | 08/31/2010 |
| 7768224 | Control apparatus for and control method of controlling motor for vehicle The present invention is aimed at provision of a control apparatus for and a control method of controlling a motor for a vehicle driven by a driving circuit that operates according to a pulse width modulation (PWM) signal. Measurement of a duty of an output signal f... | 08/03/2010 |
| 7746014 | Motor driving apparatus, brushless motor, and method for driving the same A motor driving apparatus has first, second, and third positive-side driving transistors having drains which are supplied with a power supply voltage, first, second, and third negative-side driving transistors having sources which are grounded and drains which are c... | 06/29/2010 |
| 7728538 | Method and related device for estimating the currents flowing in windings of a poly-phase electrical load at a certain instant There is a method of estimating values of winding currents, at an instant of a period, in a winding of a load, controlled in space vector modulation mode through symmetrical control phases. The winding is cyclically coupled between two supply lines through respectiv... | 06/01/2010 |
| 7719223 | Switching node based sensorless motor control for PM motor A circuit for indirectly measuring a sign of a current flowing in an inverter stage coupled to a phase of a motor or indirectly measuring the sign of the voltage induced by a counter Electromotive Force (EMF) in a coil of the phase of the motor, the inverter stage b... | 05/18/2010 |
| 7714528 | Fan driving circuit A fan driving circuit includes a digital-analog converting circuit (10), an amplifier circuit (40), and a controlling circuit (50). The digital-analog converting circuit receives a digital signal from a controlling integrated circuit (IC), and o... | 05/11/2010 |
| 7710054 | Fan controller with duty cycle comparator A motor controller for a direct current motor includes a first node receiving first PWM signals having a duty cycle indicative of a desired rotational speed of said motor and an input node receiving second digital signals, the frequency of said second signals indica... | 05/04/2010 |
| 7705550 | Noise suppression for hall sensor arrangements A method and apparatus is provided for processing signals from a Hall-effect device arrangement coupled to a monolithic brushless DC motor where the motor is driven by a PWM circuit providing PWM drive signals. ... | 04/27/2010 |
| 7688018 | Inverter An inverter contains the following structure: an inverter circuit having upper-arm switching elements connected on the positive side of a DC power source and lower-arm switching elements connected on the negative side of the DC power source; a current sensor that de... | 03/30/2010 |
