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| Number | Title | Issue Date |
| 7293761 | Diagnostic system for cranes A hoist system for critical loads incorporates improved safety technology to monitor various possible fault conditions. For example, a command-not-operated function causes braking of the hoist when an encoder detects one of a group of conditions including a lack of ... | 11/13/2007 |
| 7285930 | Method and device for controlling a multiphase electronically commutated motor A method is specified for controlling a multiphase motor that is commutated by an inverter-side bridge circuit, in the course of which a particularly precise and technically simple detection of a control-relevant variable of a considered motor phase, in particular o... | 10/23/2007 |
| 7265505 | Control apparatus for selectively driving plural stator windings of synchronous motor A control apparatus for a synchronous motor such as a switched reluctance motor, having a plurality of respectively separate stator windings, can operate the motor in either a normal mode or a low-torque mode by selectively supplying drive current to the stator wind... | 09/04/2007 |
| 7190146 | Control system and method for an overhead bridge crane Included herein is a system and method for controlling a velocity vector of an overhead crane. A motor is attached to the crane and is positioned to move the overhead crane and has an output vector including a rotational direction and a rotational speed. A variable ... | 03/13/2007 |
| 7177533 | Motor control system for a surgical handpiece A system and method for powered surgical handpiece capable of powering various micro-cutting instruments is described. The system is comprised of a controller adapted for controlling/interfacing with a powered surgical handpiece based upon user-defined procedural in... | 02/13/2007 |
| 7090470 | Apparatus and method for preventing a piston and valve collision in a linear compressor An apparatus and method for controlling a linear compressor is provided. The linear compressor controlling apparatus includes a voltage detection unit, a current detection unit, a control unit and a compressor drive unit. The voltage detection unit detects a voltage... | 08/15/2006 |
| 7044234 | Hand-held electrical combination hammer drill A hand-held electrical combination hammer drill capable of being used both as a drilling hammer and as a chisel hammer, and including an actuation member (17) for actuating an electrical on-off switch of the hammer drill and located on the tool handle switchi... | 05/16/2006 |
| 7038421 | Method and system for multiple servo motor control A system for control of a plurality of motors comprising: an inverter including at least three legs, with each leg including two series switching devices configured to receive a command from a controller. The system also includes a first motor operably connected to ... | 05/02/2006 |
| 7009856 | Vector-controlled dual inverter system and method for induction motor A vector-controlled, dual inverter system for a three-phase induction motor is disclosed. The inverter system comprises a first inverter system which is connected to one end of three phase windings of a stator and performs compensation of a back electromotive force;... | 03/07/2006 |
| 6972532 | Controlled motor coast in media handling system By controlling all motors so that they all decelerate at substantially the same rate, buckling of media in a media handling system is substantially eliminated on shutdown. Preferably, the deceleration rate of the highest inertia motor is used as the common decelerat... | 12/06/2005 |
| 6963792 | Surgical method A teleoperator system with telepresence is shown which includes right and left hand controllers (72R and 72L) for control of right and left manipulators (24R and 24L) through use of a servomechanism that includes computer. The teleoperato... | 11/08/2005 |
| 6942138 | Fuel-based appliance with vocal function A fuel-based appliance is equipped with a vocal device. The fuel-based appliance includes a switch installed thereon. The vocal device is installed in the fuel-based appliance. The vocal device includes a circuit board, a chip installed on the circuit board, a speak... | 09/13/2005 |
| 6935223 | Pressure fryer A pressure fryer is provided including a cooking container having a pressure vent which is connected to a high pressure cylinder filled with carbon dioxide. An electromagnetic valve and a check valve are provided on the connecting tube between the pressure vent and ... | 08/30/2005 |
| 6907947 | Power control unit for electric vehicle A power control unit for electric vehicle which can easily detach the high voltage cables even if the motor room is deformed, for example, by head-on collision and/or rear-end collision of the vehicle, which is difficult to be deformed, which can make small, and whi... | 06/21/2005 |
| 6737828 | Washing machine motor drive device A washing machine motor drive device drives a motor using an inverter circuit, which implements a constant torque control through a change in the torque-revolution speed characteristic of the motor. This facilitates an easy control of braking torque (negative torque... | 05/18/2004 |
| 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 |
| 6532405 | Method for detecting a locked axle on a locomotive AC traction motor An exemplary embodiment of the invention is a method for detecting a potentially locked axle on a vehicle propelled by an AC motor. The method includes conducting a speed test by estimating axle speed and comparing estimated axle speed to measured vehicle... | 03/11/2003 |
| 6133700 | Torque controller system having a torque processor with improved tractive effort distribution A torque controller system provides improved torque distribution as a function of wheel diameter size in a vehicle propelled by electric traction motors. The system includes one or more torque processors each having a multiplier coupled to receive an inpu... | 10/17/2000 |
| 6081080 | Method and apparatus for reducing voltage stresses in electric machines A method and apparatus for reducing winding failures in electric machines resulting from the application of high frequency or high dV/dt voltage pulses or voltage signals to the phase windings of the machine in which an inductive element is provided betwe... | 06/27/2000 |
| 6037724 | Electronic controlled surgical power tool A surgical power tool is disclosed including a power console and a handheld motor unit. The power console provides controlled power and to the handheld motor unit. Pressure sensitive switching elements on the handheld unit provide signals to the power con... | 03/14/2000 |
| 6028402 | Automatic rail characterization for adhesion system evaluation for AC locomotives A system and method for evaluating the effectiveness of a tractive effort maximizing control system in a wheeled vehicle utilizes a process of operating the vehicle by applying controlled power to at least some wheels of the vehicle to enable motion of th... | 02/22/2000 |
| 5898281 | Method and device for the common regulation of several electric motors driving the driving wheels of a motor vehicle In a motor vehicle driving system comprising several asynchronous electric machines (11, 12) each coupled to a driving wheel (13, 14), a polyphase supply device (2) and a regulating device (6) using a reference signal (SR) representative of a speed of one... | 04/27/1999 |
| 5841254 | Torque maximization and vibration control for AC locomotives A traction control system for an ac locomotive optimizes traction performance by separately controlling the allowable creep level of each individual axle and by minimizing torsional vibration per axle. The traction control system includes a torque maximiz... | 11/24/1998 |
| 5712543 | Magnetic switching element for controlling a surgical device An apparatus for controlling a surgical device includes a housing and a magnetic switching element mounted on the housing. The magnetic switching element includes a magnet, a magnetic sensor configured to produce a control signal for controlling the surgi... | 01/27/1998 |
| 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 |
| 5610819 | System for enhancing wheel traction in a locomotive by reapplication of excitation using an S-shaped curve A traction enhancing system detects and corrects wheel slip and enhances wheel traction in a railroad locomotive having a plurality of wheel pairs for engaging a pair of rails and a traction motor operatively associated with each wheel pair. The locomotiv... | 03/11/1997 |
| 5408164 | Differential speed control of electric motors The invention relates to apparatus for controlling a plurality of electric motors. The apparatus includes drive means for applying electrical power to the motors at a predetermined current or voltage. Sensor means are provided for sensing the load on each... | 04/18/1995 |
| 5313149 | Current supply control apparatus for inductance load The present invention relates to a current supply control apparatus capable of actuating a large inductance load at a low electric power source voltage and also capable of improving a responsibility in a current supply control of the inductance load. When... | 05/17/1994 |
| 5077506 | Microprocessor controlled arthroscopic surgical system An apparatus for controlling the speed of a plurality of DC motors, comprises a device for supplying voltage to one of the plurality of DC motors, first selector for selecting one of the DC motors to be connected to the device for supplying voltage, secon... | 12/31/1991 |
| 4896090 | Locomotive wheelslip control system A locomotive propulsion system includes wheelslip control with the following interrelated features: comparing the rotational speeds of the locomotive's separately driven wheels and detecting the highest and lowest; providing a reference speed value indica... | 01/23/1990 |
| 4888533 | Brushless DC motor A brushless DC motor useful as a driving source of a refrigerant compressor of a refrigerating apparatus or a fan. A position detecting means generates a control signal by detecting the terminal voltage on input-output terminals current to three-phase rot... | 12/19/1989 |
| 4825131 | Control system for induction motor driven electric car A DC voltage on an electric car stringing is supplied to a variable voltage and variable frequency PWM inverter so as to be converted into a three-phase alternating current which is supplied to a plurality of three-phase induction motors. The motors are c... | 04/25/1989 |
| 4780650 | Control system for a power converter for driving induction motors In a control system for a power converter for driving induction motors, the control system separately controlling an exciting current component of the primary current of the induction motors contributing to generation of a magnetic flux and a torque curre... | 10/25/1988 |
| 4757240 | Apparatus for controlling electric vehicle using induction motor A main circuit of an electric vehicle using an induction motor is constituted by an invertor for producing three phase AC power having a variable frequency and a variable voltage and a three-phase induction motor supplied with the AC power by the invertor... | 07/12/1988 |
| 4686434 | Electric vehicle monitoring system An electric vehicle monitoring system in which one induction motor has a rotational speed detector but another motor does not have such a detector. Separate current detectors monitor the current delivered to each of the motors. A calculations circuit uses... | 08/11/1987 |
| 4647824 | Output voltage control for a DC servo amplifier In a system having a plurality of electric motors which are rated at different voltages, a voltage control circuit enables the electric motors to be connected to a common power supply. The voltage control circuit determines a first voltage appearing betwe... | 03/03/1987 |
| 4641069 | Plural motor changeover control system A plural motor changeover control system for using a plurality of motors (1a, 1b), the power outputs of which differ, by successively switching among the motors. A conversion table (32a, 32b) corresponding to a motor designated for operation from among th... | 02/03/1987 |
| 4463289 | Wheel slip control using differential signal Apparatus for controlling wheel slip in a locomotive driven by d.c. motors which receive power from a diesel driven generator, has sensors which provide signals representing speeds of different driven wheels to a velocity unit. The velocity unit derives a... | 07/31/1984 |
| 4454455 | Fault responsive means for changing control sequence of a multiple-bridge electric power converter In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by means of several phase-controlled rectifying bridges having serially connected outputs. The bridges are controlled sequentially... | 06/12/1984 |
| 4420713 | Turn-off control means for an ac-to-dc electric power converter In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by a plurality of phase-controlled rectifying circuits having serially connected outputs. To improve power factor, forced commutat... | 12/13/1983 |
