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Document Title |
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7598687 |
Method and control unit for controlling fan motors
A method for controlling a first fan motor using a first pulse width modulation signal having a first pulse control factor, and for controlling a second fan motor using a second pulse width...
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7561829 |
Motor control device, image forming apparatus, and motor control method
A motor control device includes a velocity detection unit, a motor control unit, a phase difference detection unit, and a correction value calculation unit. The velocity detection unit detects each...
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7525263 |
Control system
A master unit and a plurality of slave units are connected by way of a communication path. The master unit sends to the slave units timing signals generated by its own cycle signal generator by way...
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7518323 |
Motor driving device
A motor driving device is disclosed that includes a first drive circuit that drives a first electric motor and increases a rotational speed of the first electric motor according to an increase in a...
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7492111 |
Method of controlling two or more commutator DC permanent magnet motors in driving mechanisms for setting a position of furniture parts and a device for carrying out the method
The invention relates to a method of controlling two or more commutator DC motors with permanent magnets in driving mechanisms for setting a position of furniture parts such as tables, beds, chairs...
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7456599 |
Position feedback device with prediction
An apparatus for use with an encoder feedback device includes a comparator, a counter, and a prediction unit. The encoder feedback device is coupled to rotate with a rotating load and operable to...
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7417392 |
Electronic line shaft with phased lock loop filtering and predicting
An improved electronic line shaft provides for a predictor sending predicted position and/or velocity values to servant drives that may be later strobed in by high speed low-latency strobe signals...
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7417386 |
Electronic line shaft
A method and assembly for synchronizing machine operations, the assembly comprising a reference generator for generating a speed reference signal and a position reference signal, a plurality of...
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7377363 |
Elevator with variable drag for car and counterweight
An elevator car and counterweight system is provided with a variable drag element. The variable drag element is controlled such that the lower of the counterweight and the car has a higher drag...
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7372220 |
Extrusion plant with synchronized drive units, and method of synchronization of drive units
In a method for synchronizing drive units, a target value of the speed of each drive unit of a plurality of drive units speed is computed by determining the product of a maximum speed of the drive...
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7294980 |
Fan control system
A fan control system. The system includes a plurality of fans, each having a control device. One of the fans is designated as a master fan and others are served as slave fans according to a...
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7164253 |
Motor drive control apparatus
On end of a reactor (L 1 ) is connected to a positive electrode of a battery (B 1 ) and the other end is connected to a power line via a transistor (Q 1 ) and to the ground via a transistor (Q 2 )....
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7135826 |
Fan control system
A fan control system. The system includes a plurality of fans, each having a control device. One of the fans is designated as a master fan and others are served as slave fans according to a...
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7109670 |
Motor drive with velocity-second compensation
An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity...
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6956339 |
Multiple hoist synchronization apparatus and method
A hoist synchronization apparatus and method using a master controller operating software that provides a pulse reference to a slave controller. The slave commands its motor to rotate at the speed...
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6933687 |
Dual motor configuration with primary brushless motor and secondary integrated speed control motor
A dual motor configuration 10 is provided for driving two fans for moving air to cool an engine. The dual motor configuration includes a primary brushless motor 18 constructed and arranged to...
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6891342 |
Drive apparatus for PWM control of two inductive loads with reduced generation of electrical noise
A drive apparatus for driving two motors by PWM control of respective switching elements connected to the motors, whereby respective control signals are applied to the switching elements such that...
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6876162 |
Method and system for controlling drive motors of at least two machines
The invention relates to method and apparatus for controlling the powering of electric drive motors ( 8 ) of a group of at least two machines ( 2, 3, 4 ), the motors operating in periodic motions,...
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6812656 |
Sequenced pulse width modulation method and apparatus for controlling and powering a plurality of direct current motors
A control system for individually controlling power from a single voltage source to a plurality of motors is described. A chopper circuit, in conjunction with the control system, generates...
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6600278 |
Clean power common buss variable frequency drive system
A N pulse variable frequency drive for driving two or more motors that is the combination of two or more variable frequency drives with each drive driving an associated one of the two or motors....
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6486632 |
Control device for motor/generators
A controller for motor/generators is proposed which allows reductions in ripple current generated by an inverter driving a power-generating motor/generator and a vehicle-driving motor/generator....
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6447256 |
Gear pump having a multishaft drive and method of operating same
A gear pump having two meshing gears which are each assigned to a shaft and which are each driven by a driving unit. The driving units are controllable by a control unit such that the shafts rotate...
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6216080 |
Wheel module for a vehicle with an electrically controlled braking system (EBS)
A wheel module for the control of the braking force on a wheel of a vehicle with an electrically controlled braking system (EBS), in which the need for data transfer to other wheel modules, or to a...
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5982116 |
Controllable combined power system using an active power source rotation speed as the proportional control reference
A controllable combined power system including an active power source and an auxiliary power source uses the active power source as a basis for controlling the speed or torque of the auxiliary...
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5814956 |
Method and apparatus for control in power failure
A method and apparatus for controlling a machine in a power failure. The present invention is applicable to such machines that a tool and a workpiece must always be controlled in synchronization...
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5708332 |
Dual motor drive system
A dual motor drive system particularly adapted for the drive of long printing presses provides uncoupled control of both the voltage and current provided to the motors. A current divider...
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5625262 |
System for equalizing the load of a plurality of motors
A system having two or more A.C. motors driving the same load. The stator windings and rotors of both motors each conduct current having a vector representative of a magnitude and angular position...
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5559415 |
Integrator management for redundant active hand controllers
A redundant active hand controller system has first and second motors connected to a common shaft. A compensator which differentiates a motor command signal from a first proportional and integral...
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5517097 |
Controlling apparatus and controlling method in machine tool
A machine tool controlling apparatus and method wherein the current operation is in a normal operation mode or in a positionly synchronized operation mode in which a spindle and a subordinate axis...
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5487437 |
Coupled differential turning control system for electric vehicle traction motors
A turning control system for an electric vehicle includes a differential filter which receives a signal indicative of a desired vehicle steer angle and generates a pair of signals representative of...
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5442265 |
Method and apparatus for improving the running characteristics of a wheel block bogie
A rail vehicle may be provided with a plurality of individual wheels (11, 12, 21, 22) and traction motors which are supplied with power on a wheel block by wheel block basis by means two control...
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5434486 |
Synchronous operation system
In a synchronous operation system, rotating positions of two rotating elements MSP and SSP driven by induction motors IM 1 and IM 2 are maintained in a predetermined positional relation, what is...
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5283506 |
Method of and apparatus for regulating the operation of a driving system for a packing machine
The operation of a driving system for a cigarette packing machine, wherein the driving system has a rotary main drive and several slave drives electrically connected to the main drive, is...
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5278477 |
Drive system for a printing machine with several printing units
A drive system for a printing machine with a plurality of printing units connected to one another via a gear train into which power is fed at different points by at least two motors, includes...
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5266787 |
Laser scanner using two scan motors independently controlled by a single signal
A dual motor speed control circuit for providing independent speed control of two motors in a laser scanning device is disclosed herein. This apparatus utilizes a single input signal having...
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5239247 |
Reconfigurable master-slave control
A machine control permits the selection of input values defining configurations of motors on the machine in desired master-slave relationships. Individual master-slave dependencies may be...
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5196769 |
Motor control device
The present invention relates to a motor control device using an inverter or inverters, in particular, it relates to a motor control device suitable for the prevention of inertial rotation of a...
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5191267 |
System for indicating extent of overdrive in frictional drive arrangements
A spiral drum freezer apparatus having a system for measuring and monitoring the "overdrive" of a rotated drum relative to a spiral belt helically wrapped around the drum in an ascending fashion....
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5166582 |
Drive arrangement of an open-end spinning machine
Drive arrangement for spinning stations of an OE spinning machine. The feed rollers of the spinning stations can be driven by an electric motor and the draw-off rollers by another electric motor....
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5083066 |
Method of controlling synchronous operation of machine tool
In a machine tool having first and second spindles, which are connected to respective spindle motors and control circuits each control circuit including a velocity controller and a position...
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5070291 |
Connection switching apparatus for three-phase induction motor
Low rotational speed characteristics of a three-phase induction motor driven by a PWM inverter are improved by rapid Δ-Y connection switching by semiconductor switches (1, 2, 3, 4, 5), for...
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5004962 |
Automatic motor synchronizer
An automatic synchronizer 20 includes a throttle rod 62 which provides a direct link between the slave motor throttle lever 44 and the slave motor 36. A microprocessor system 30 provides a signal...
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4988937 |
Synchronous control system and method therefor
A synchronous control system for a pair of spindles of a machine tool including a master spindle and a slave spindle. Current positions of the main spindles are detected, and a deviation between...
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4912377 |
Device for driving several cables of a transportation installation operating in synchronism and method for the automatic regulation of the synchronous drive of these cables
A technique for driving with continuous synchronized movement a plurality of parallel pulling cables of a transportation installation in a direction parallel to the cables comprising at least one...
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4866354 |
Spiral freezer drive system
In spiral drum freezer apparatus having an insulated disclosure a spiral drum is mounted for rotation within the enclosure and includes a spiral belt to the spiral drum with the top of the spiral...
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4812721 |
Wire drawing control apparatus
In a magnet wire fabrication process in which the drawing of wire is "in-line" with the enameling process, it is often a requirement that the drawing machines be supplied with electrical power from...
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4789814 |
Transport speed control system for glass annealing installation
A transport speed control system for a glass ribbon annealing installation comprising means to control a peripheral drive speed of those of glass ribbon transporting rollers which contact a portion...
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4788476 |
Machine for lapping two curved-tooth bevel gears
A lapping machine for correcting the asymmetrical hardening distortions which occur during the hardening of gear wheels, especially bevel gears, is disclosed. This machine is particularly...
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4766356 |
Device for opening and closing a vehicle top
A device for opening and closing a vehicle top by rotations of drive shafts rotatably provided with both right and left sides of the vehicle, comprises two individual motors which actuate the...
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4765456 |
Variable speed belt conveyor drive system
A variable speed conveyor drive system, which is programmable to suit various operating conditions; comprises a master drive unit (7) having a drive motor (16), at least one slave drive unit (8-10,...
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