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| Number | Title | Issue Date |
| 7893635 | Liquid cooling system with automatic pump speed control A system comprising a fan tachometer module, a conversion module, and a pump tachometer module. The fan tachometer module is adapted to measure a speed of a cooling fan. The conversion module is in communication with the fan tachometer module, and is adapted to conv... | 02/22/2011 |
| 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 of a communication path. The slave units determine the cycle differe... | 04/28/2009 |
| 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 etc., where particular driving mechanisms must maintain mutually def... | 02/17/2009 |
| 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 slave units, each slave unit including, a mechanical device, a separate ... | 08/26/2008 |
| 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 to eliminate network jitter and delay. The predictor may be implement... | 08/26/2008 |
| 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 against further movement. In an embodiment which is particularly useful ... | 05/27/2008 |
| 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 unit, a unit-dependent normalized ratio value of the drive unit, and ... | 05/13/2008 |
| 7317304 | Inductive load driving device An inductive load driving device includes two inductive loads (20A, 20B) connected to a power source (21), two switching elements (15A, 15B), which are connected in series to the two inductive loads, respectively, their on/off are ... | 01/08/2008 |
| 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 specific designation method, wherein the control device of the master fan ac... | 11/13/2007 |
| 7259485 | Magnetic brake for window covering powered by DC motor A braking magnet is attached to the housing of a motor of a motorized component such as a window covering. With this structure the motor is braked from turning under the weight of the window covering when deenergized. ... | 08/21/2007 |
| 7242857 | Motor control circuit A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a squ... | 07/10/2007 |
| 7218846 | Fan 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 |
| 7174731 | Rotational speed control system, rotatingly driving system, air blow system, clean bench, outdoor unit of air conditioner This invention relates to a rotational speed control system including a plurality of motor drivers for driving motors, and the object thereof is to drive a plurality of motors at the same rotational speed without depending on the number of motor drivers and without ... | 02/13/2007 |
| 7164253 | Motor drive control apparatus On end of a reactor (L1) is connected to a positive electrode of a battery (B1) and the other end is connected to a power line via a transistor (Q1) and to the ground via a transistor (Q2). By PWM control of the transistors (Q1, Q | 01/16/2007 |
| 7141901 | Downhole torque-generating and generator combination apparatus A combination of a torque-generating apparatus with an alternator/generator. The torque-generating apparatus comprises a first assembly (10, 25) including a generally cylindrical member of magnetically soft material and having a longitudinal axis, and a secon... | 11/28/2006 |
| 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 specific designation method, wherein the control device of the master fan ac... | 11/14/2006 |
| 7132809 | Fan-controlling system to control a plurality of fans with different pulse width modulation signals A fan controlling system applicable in an electronic system having a plurality of fans is disclosed. The fan-controlling system includes a first signal generating module and a second signal generating module for generating a first and a second pulse width modulation... | 11/07/2006 |
| 7122984 | Method for identifying an overload current of an electric drive The invention relates to Method to detect a sluggishness or the blocking of an electric drive (3), which is triggered via a power semiconductor component (7). The electric drive (3) can be operated in both a partial load range (PWM timing signal... | 10/17/2006 |
| 7119504 | Protective circuit for reducing electrical disturbances during operation of a DC motor A protective circuit, for reducing electrical disturbances or interference during operation of a DC motor, features a series transistor (62) arranged in a supply lead from a DC voltage source (12) to a DC motor; an auxiliary voltage source (52),... | 10/10/2006 |
| 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 signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 7079758 | PWM driving apparatus When a PWM signal generating unit (10) sets a duty D of a PWM signal based on command signals (10c), the PWM signal generating unit (10) sets a phase difference φ between each of the PWM signals based on a relation formula of φ (degree)... | 07/18/2006 |
| 7010359 | Method and device for synchronizing drive combinations A method is provided for synchronizing drive combinations having a plurality of drives for machines. The drives include at least one master drive and a plurality of slave drives assigned to the master drive. A central control unit is provided, as well as controls fo... | 03/07/2006 |
| 7002310 | Piezo-based encoder with magnetic brake for powered window covering The position and speed and, in some embodiments, direction of rotation of a motor for turning the rod of an object such as a window covering is determined by placing a braking magnet next to the motor and a piezoelectric element between the braking magnet and motor.... | 02/21/2006 |
| 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 conveyed by that pulse reference. The slave controller monitors the p... | 10/18/2005 |
| 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 be electronically controlled to drive a first fan 16 ... | 08/23/2005 |
| 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 each commencement of a transition of one of the switching elements fr... | 05/10/2005 |
| 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, wherein the periodic motions are mutually coordinated in a ... | 04/05/2005 |
| 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 drive-pulses, which operates the IGBT switching devices to sequentially provi... | 11/02/2004 |
| 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. One application is a decanter centrifuge which has a main mo... | 07/29/2003 |
| 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. The control device for motor/generators has a first inverter... | 11/26/2002 |
| 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 at a definable angular velocity. The control units have a... | 09/10/2002 |
| 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 central module, if present, is reduced considerably. All ... | 04/10/2001 |
| 6005297 | Power output apparatus and method of controlling the same A power output apparatus 110 includes a planetary gear 120 having a planetary carrier, a sun gear, and a ring gear, an engine 150 having a crankshaft 156 linked with the planetary carrier, a first motor MG1 attached to the sun gear, and a second motor MG2... | 12/21/1999 |
| 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 power source, either in the same direction as the active power... | 11/09/1999 |
| 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 with each other, and allows the tool and workpiece to stop w... | 09/29/1998 |
| 5804934 | Power output apparatus and method of controlling the same A power output apparatus (20) of the present invention includes a clutch motor (30), an assist motor (40), and a controller (80) for controlling the clutch motor (30) and the assist motor (40). The clutch motor (30) includes an outer rotor (32) linked wit... | 09/08/1998 |
| 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 proportions the current provided to a main and secondary motor in ac... | 01/13/1998 |
| 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 of the current in the respective rotor and stator winding.... | 04/29/1997 |
| 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 controller, differentiates a motor command signal from a se... | 09/24/1996 |
| 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 are positionly synchronized. If it is determined that the ... | 05/14/1996 |
