|
Match
|
Document |
Document Title |
|
|
7444070 |
Fan motor with digital controller for applying substantially constant driving current
An improved fan arrangement features a radial or diagonal fan ( 370 ) with which a direct current motor ( 32 ) is associated as its drive motor, further comprising a digital control element ( 23,...
|
|
|
7394975 |
Drive circuit for a sensored brushless DC motor
A drive circuit for a sensored brushless DC motor, which has a rotably mounted rotor hub, comprises four legs. Each leg has a MOSFET and a diode configured to form four individual nodes. A first...
|
|
|
7318485 |
Method of Controlling the direction of rotation of a power tool
The invention discloses a power tool for screwing or drilling having a motor for driving a drive shaft, a controller for controlling the power tool, a motor switch for switching the motor on and...
|
|
|
7274866 |
Power tool and method for controlling a power tool
A power tool is disclosed comprising a controller for controlling at least one operating parameter, a motor for driving a tool, at least three switching elements which are coupled to the...
|
|
|
7274865 |
General purpose 100% solid state drive for direct current rotary machines
General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two...
|
|
|
7245100 |
Multi-axis AC servo control system and method
A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on...
|
|
|
7185528 |
Speed 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...
|
|
|
7174093 |
Wheel chair drive apparatus and method
A control system for a powered wheel chair drive modulates a pulse power delivery signal such that power is delivered gradually at throttle positions corresponding to a low speed, and power is...
|
|
|
7145311 |
Vector control device of winding field type synchronous machine
A vector control device of a winding field type synchronous machine with which even when voltage changes caused by resistance voltage falls and inductance fluctuations due to armature current occur...
|
|
|
7095952 |
Method for optimizing the efficiency of a motor operated under a load
The invention relates to a method to optimize the efficiency of a motor operated under a load having an essentially quadratic characteristic curve, the motor being connected to a motor control with...
|
|
|
7062159 |
Device for correcting a digital estimate of an electric signal
A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate...
|
|
|
7046917 |
Speed controlling device of a motorized cart for a person to ride on
A device of a cart includes a control, a speed regulating potentiometer, a microprocessor, a digital-to-analogue converter, a motor controlling unit, and a switch; the control is angularly...
|
|
|
6891346 |
Commutation and velocity control system for a brushless DC motor
A commutation and velocity control system of a brushless DC motor receives a velocity command signal and provides command signals to drive the brushless DC motor. The system includes a summer that...
|
|
|
6888331 |
Commutation of sensorless direct-current motors
The invention relates to a sensorless commutation of a direct-current motor. To allow an exact, easy to design, flexible, and highly integratable circuit arrangement for commuting motor devices,...
|
|
|
6839653 |
Method for correcting the determination of the rotational position of a commutated DC motor drive shaft
A method for determining the position of an element driven by the drive shaft of a commutated direct current (DC) motor includes counting current ripples detected in an armature current signal as...
|
|
|
6810202 |
Apparatus for controlling rotational speed of motor
An apparatus for controlling a rotational speed of a motor, coupled to a sensing unit capable of outputting a sensing signal. The apparatus includes a controlling unit, coupled to the sensing unit,...
|
|
|
6771894 |
Motor control resolution enhancement
A motor speed resolution enhancement method and system. A display system controller ( 202 ) measures the frame rate of an incoming signal to determine the desired color wheel speed. A digital speed...
|
|
|
6750622 |
Motor controller system for battery-powered motors
A motor controller system ( 15 a ) for dc power source motors ( 10 ) which includes a sensor device ( 16 ) that operates to measure and generate a voltage signal from the motor current and the rate...
|
|
|
6633149 |
Method for digital control of a universal motor, in particular for electrical household appliances
The invention concerns a method for digital control of a universal motor, in particular for electrical household appliance, comprising steps which consist on: measuring said engine ( 21 ) rotation...
|
|
|
6433507 |
Spread spectrum motor control circuit
A motor control circuit for use in a motor circuit includes a varying duty cycle pulse width modulation circuit and a switch. The varying duty cycle pulse width modulation circuit is operable to...
|
|
|
6424112 |
Electric motor hand tool with digital input and control
A speed control device particularly adapted for use with electrical motor-driven hand tools has digital operator input controls. A semiconductor switching device controls a percentage of ON time...
|
|
|
6408130 |
Electric drive system with an electronically commuted DC motor in order to reduce torque irregularities
The invention relates to an electric drive device with a DC motor ( 2 ) comprising a control circuit with an electronic commutator ( 3 ). The invention is characterized in that a derivation of a...
|
|
|
6385395 |
Fan motor with its speed controlled by operating periods of a pulse wave
A fan motor whose speed is controlled by an operating period of pulse waves includes first and second rectifying circuits, a voltage comparison circuit, and a differential amplifier. A pulse wave...
|
|
|
6351601 |
Fan speed control system having an integrated circuit fan controller and a method of using the same
A fan speed control system for controlling the operation and speed of a fan is described. The fan speed control system includes a power control block for supplying an output voltage to the fan. An...
|
|
|
6324339 |
Battery pack including input and output waveform modification capability
A battery pack includes a plurality of electrochemical cells and a control circuit. The battery pack provides power to a tool in the form of a pulse width modulated waveform. The plurality of...
|
|
|
6313601 |
Speed control of a motor
A three-phase motor having three Hall-effect devices for production of as many rotor position signals for use in excitation control of its windings, the signals being indicative of the angular...
|
|
|
6222331 |
Dynamo-electric machines and control and operating system for the same
A dynamo-electric machine which can function as a motor or a generator. The machine comprising a stator and an armature, and switching of the armature coils is accomplished by means of a switching...
|
|
|
6172472 |
Control system for a two-terminal electric motor connected to a voltage network having two lines
A two-terminal motor can be connected to a two-line voltage supply network utilizing a controller in which a control element is in series with the current-measuring component and both are connected...
|
|
|
6094022 |
Low jitter zero crossing BEMF detector and motor incorporating the same
A BEMF detector and method detect the BEMF of a three-phase motor using a fully differential detection system. The motor has a first coil coupled between a first coil tap and a center tap, a second...
|
|
|
5900704 |
Process and system for controlling an electrohydraulic pressure supply for an auxiliary power device for an automotive vehicle
A process and a system for controlling an electrohydraulic pressure supply for an auxiliary power device of an automotive vehicle in which a hydraulic pump system is operated by means of an...
|
|
|
5892885 |
Variable speed control switch for direct current electric power tools
A motor control circuit for a power tool includes a function switch which has a first battery contact, a speed control contact, a bypass contact and, a second battery contact connected in that...
|
|
|
5862301 |
Motor control with clamped filter output
A motor control circuit, including a filter amplifier which includes a clamping circuit to limit the maximum voltage of the filter amplifier. The filter amplifier is clamped to essentially the same...
|
|
|
5798624 |
Motor circuit
A motor control circuit for a d.c. commutator-type motor includes a semi-conductor driver circuit with a current sensor which provides an output voltage signal representing the instantaneous...
|
|
|
5783923 |
Method and apparatus for multiple-input, multiple output feedback control of variable load systems
In a feedback control system with multivariable inputs and outputs, a network of plant actuators, each controlled by self-adaptive feedback control loops with pole-tracking zeroes, is provided as a...
|
|
|
5767643 |
Commutation delay generator for a multiphase brushless DC motor
A commutation control circuit provides a substantially periodic series of commutation signals to a conventional motor sequencer. The control circuit includes a frequency-to-current converter that...
|
|
|
5717537 |
Magnetic tape apparatus
A cartridge of a single reel is inserted and information is recorded and reproduced by a helical scan type using a rotary head. A control pulse is reproduced from a recording signal of a control...
|
|
|
5703458 |
Capacitor-type motor speed controller
A quiet motor speed controller is disclosed which varies an amplitude of an AC voltage signal provided from an AC source to drive an AC motor. The controller includes a first impedance in series...
|
|
|
5691615 |
Adaptive PI control method
A method of obtaining a very robust adaptive PI control method irrespective of fluctuation of parameters of a control object, wherein (speed command r-actual speed y) is used as a state variable...
|
|
|
5680023 |
Method of measuring linear velocity of disk
A method of measuring a linear velocity of a rotating disk on a disk drive system wherein a rotation of a spindle motor is controlled in accordance with a predetermined linear velocity which is...
|
|
|
5617503 |
Motor control arrangement, and shaver comprising such a motor control arrangement
A motor control arrangement including a control circuit for controlling the speed of an electric motor (EM), which control circuit comprises a measurement resistor (MR) and a switching transistor...
|
|
|
5559407 |
Airflow control for variable speed blowers
Apparatus and method for controlling an air distribution system of the type which includes a motor drivingly associated with a blower and a duct system, and further including a target air flow rate...
|
|
|
5510683 |
Motor speed control device
A motor speed control device, preferably for use in a camera, controls a motor to rotate at a constant speed in accordance with a pulsed signal output from a motor speed detector, such as a...
|
|
|
5508594 |
Electric vehicle chassis controller
A vehicle power controller for a vehicle including a motor that drives the vehicle, a plurality of sensors and a motor controller, wherein the plurality of sensors includes an accelerator sensor...
|
|
|
5367599 |
Electric shaver in which motor rotational speed is controlled according to beard thickness
An electric shaver is provided with a motor to drive a cutter, a motor current sensing circuit, and a computation circuit which processes an output from the current sensing circuit. The computation...
|
|
|
5361025 |
Interface circuit for generating and analogue signal to control the speed of rotation of a direct-current electric motor
The interface circuit has a single input terminal for receiving an analog or digital control signal indicative of the required speed of rotation of the motor. The type of input signal is recognised...
|
|
|
5224201 |
Method and device for measuring rotary speed
A method for measuring the rotary speed of a direct-current motor having a rotor and at least a shunt-wound field winding, wherein the field current includes an ac-component caused by...
|
|
|
5212437 |
High speed starter operations monitor
An x-ray tube (10) of a CT scanner has a rotating anode and rotor combination which is propelled by AC currents applied to run and phase windings (42, 46) by a starter (22). A monitor (24) includes...
|
|
|
5105130 |
Keyboard controlled multi-function power tool with visual display
A multi-function hand-held power tool includes an electric motor for driving a tool holder and control means for energizing the motor in accordance with a selected combination of operating...
|
|
|
5055756 |
Traverse apparatus and image recording apparatus
Disclosed are a traverse apparatus and an image recording apparatus including a rotary member for traversing a material to be traversed, a storage unit for prestoring rotation control data based on...
|
|
|
5048115 |
Speed control unit for direct current electric motor with intrinsic feed-back
It is foreseen to measure the rotational speed (V) of a motor (4) by measuring the electromotive force (e.m.f.) This e.m.f. is calculated as the difference between the terminal voltage (Va) and the...
|