Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7352141 | Device and method to monitor an apparatus An apparatus for monitoring and control of one or more electric motors, including a motor controller, equipped with a soft starter. The soft starter includes memory for storing operations and event data, as well as a human-machine interface for making the event info... | 04/01/2008 |
| 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 a system clock signal to permit control parameters of the selected ax... | 07/17/2007 |
| 7214179 | Low acceleration sensitivity microphone An implanted microphone is provided that has reduced sensitivity to vibration and attendant acceleration forces. In this regard, the microphone differentiates between the desirable and undesirable components of a transcutaneously received signal. More specifically, ... | 05/08/2007 |
| 7204799 | Microphone optimized for implant use An implantable microphone for use with an implantable hearing instrument that has a reduced vibration sensitivity in comparison with its acoustic sensitivity. The microphone utilizes a plurality of small diaphragms as opposed to a single large diaphragm in order to ... | 04/17/2007 |
| 7180261 | Self-synchronous AC servo system for high-speed serial communication A self-synchronous AC servo system is used for high-speed serial communication and has multiple axes control. The system includes a computer sending command to master axis drive and slave axis drive through a transmission line. The master axis drive and slave axis d... | 02/20/2007 |
| 7145300 | 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 a system clock signal to permit control parameters of the selected ax... | 12/05/2006 |
| 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 |
| 7119505 | Servo motor control system In a servo control system, a numerical control device and at least one servo amplifier are connected to each other with a serial bus to control a servo motor connected to the servo amplifier. In this system, data transfer systems of at least two types for the serial... | 10/10/2006 |
| 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 |
| 7023169 | Method for changing speed of motor group A method for changing the speed of a motor group, in particular for starting or stopping it, the motor group comprising a plurality of squirrel-cage induction motors or synchronous motors and network converters arranged for their control, when the nominal supply pow... | 04/04/2006 |
| 7023151 | Switching device for controlling at least two motors A switching device for controlling at least two motors has a single converter, wherein the at least two motors are connected to the converter by a power line and a feedback line, respectively. At least one logic module is connected to the converter and evaluates sig... | 04/04/2006 |
| 6995539 | Device and a method for estimating the speed of a slip ring asynchronous machine The invention relates to a device and a method for estimating the speed of a slip ring asynchronous machine. The asynchronous machine includes a stator having a stator winding, arranged to be fed with three-phase voltage and current in order to generate a varying ma... | 02/07/2006 |
| 6943521 | Motor drive, motor drive control method, and component attaching device In a motor drive device having a plurality of driver units for driving motors and a command generator for giving a command to the driver units which are connected in serial communication, there is a communication section for setting up the communication formats corr... | 09/13/2005 |
| 6933698 | Method of driving a servo motor with a built-in drive circuit Disclosed is a method of driving a servo motor with a built-in drive circuit in which a common rectifying circuit is provided on a distribution board to which a plurality of the servo motors with built-in drive circuits are connected, to thereby achieve a reduction ... | 08/23/2005 |
| 6812657 | Motor control for two motors A load in an electrical apparatus is driven by two motors M1, M2. Switching means (R1, R2) switches the motors M1, M2 between: a series configuration, in which the motors M1, M2 are connected in series across a... | 11/02/2004 |
| 6806660 | Motor controlling serial communication device and motor driver A motor controlling serial communication device includes an upper controller having a first IC and a first connector, and motor drivers having second ICs, second connectors and third connectors. First cables and second cables are used for coupling the upper controll... | 10/19/2004 |
| 6791294 | Servo control system There is provided a serial transmitting section for serially transmitting a command frame 100 which is sent from a host controller 1 to a positioning type servo amplifier 30 and a command follow-up type servo amplifier 50. In the command ... | 09/14/2004 |
| 6686712 | Motor network control system A motor network control system is provided which is capable of reducing the wiring length of a power cable and in which upon replacement of a motor or an inverter of a specific motor unit, no adverse influence is exerted on the other motor units. A power ... | 02/03/2004 |
| 6680590 | Vibration motor and apparatus using the same A vibration motor obtains a FAST signal when r.p.m. of the motor is faster than reference speed, whereby an output-driving circuit is controlled by the FAST signal to omit parts of the powering periods of respective phases. The motor thus controls the r.p... | 01/20/2004 |
| 6653810 | Motor control system A motor controller circuit for controlling an electric motor in response to motor commands from a host controller. The controller circuit includes a motor driver circuit for providing motor driver signals to the motor in response to motor driver commands.... | 11/25/2003 |
| 6522096 | Control circuit for a robot power supply A mechanism controller for controlling power to motors of a mechanism having several motors, such as a robot. Each motor has a resolver for indicating the motor position. A driver unit is associated with each motor to supply power to the motor. Each drive... | 02/18/2003 |
| 6348774 | Method for controlling several stepping motor modules with prior loading of ramp data In a method and device for controlling several stepping motor modules in printing or copying machines, sets of ramp data are centrally calculated in a computer in a calculation phase and are transmitted via a bus system to one logic unit each in a loading... | 02/19/2002 |
| 6281645 | Motor control system and image forming apparatus using the same A motor control system includes a processor having a clock output terminal for outputting clock pulses in desired cycles, a plurality of motors, and a plurality of motor drivers which are provided one for each motor and drive the corresponding motors on t... | 08/28/2001 |
| 6028404 | Motor drive circuit system utilizing multiple DC power driving devices switchable between parallel, and series/parallel combinations At least two components that use DC power to drive at least two motors, such as DC armatures, field windings, etc., collectively referred to as DC driving devices, are connected together by switching components which can be operated to selectively connect... | 02/22/2000 |
| 5986416 | Apparatus and method for driving a mechanically-driven device in an electrical vehicle The apparatus is used for driving a mechanically-driven device in an electrical vehicle having at least one electrical traction motor. The apparatus comprises an auxiliary electrical motor mechanically connected to the device. The device is driven by the ... | 11/16/1999 |
| 5757154 | Electric motor braking circuit arrangement A motor braking circuit arrangement, for use with a series/universal motor and a power supply for supplying power to the motor, including two separately actuable switches electrically interconnecting a separate braking winding with the motor to effect bra... | 05/26/1998 |
| 5667141 | High pressure cleaning means A high pressure cleaning means is described with a preferably portable housing having a high pressure pump (6) and an electric motor drive (7) for the high pressure pump (6), the motor drive having an electric drive motor (8) with a drive shaft (9) connec... | 09/16/1997 |
| 5163170 | Spin and or stall detector for an electrically propelled traction vehicle For a traction vehicle having two wheels driven by separate electric motors, a spin/stall condition is indicated if one of the wheels is rotating faster than a predetermined reference speed while the other wheel is not rotating, and a total stall conditio... | 11/10/1992 |
| 4825133 | Electromechanical actuator control system An electromechanical actuator includes an electric motor and a control and drive circuit mounted integrally with the electric motor. The control and drive circuit includes a serial-to-parallel converter for converting a control signal in the form of seria... | 04/25/1989 |
| 4782271 | Electronic motor control circuit A motor control circuit is utilized to monitor and control the power to two series connected 110-120 VAC motors, to detect an imbalance between the operation of the two motors, and to remove the power to both motors if one motor operates in an abnormal ma... | 11/01/1988 |
| 4698561 | Use of SCR's in extended retarding An improved drive system for large mining trucks employing combined diesel/electric propulsion or the like wherein AC current generated by the alternator is rectified before powering wheel motors and wherein the wheel motors are used as generators to prod... | 10/06/1987 |
| 4658189 | Series connected series motors for independent loads A traction drive system for a vehicle is disclosed which comprises a pair of series wound motors (32,34) which are connected in series with each other and which drive independent traction wheels (22,24), respectively, of the vehicle. The no-load torque of... | 04/14/1987 |
| 4633147 | Electric powered vehicle and method of propelling the same An electric powered vehicle or the like includes a first mechanical drive system for a first side of the vehicle and a second mechanical drive system for a second side of the vehicle. A first DC motor and a second DC motor are respectively coupled to the ... | 12/30/1986 |
| 4532458 | Variable-speed electrical machines An arrangement to provide variation of the speed or other operating parameters of an electrical machine without connection to the rotor. The machine is of the induction type having a winding in separate parts to create a flux movable in the air-gap differ... | 07/30/1985 |
| 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 |
| 4458182 | Drive device with two mutually counteracting motors for eliminating gearing backlash With small drive torque the motors counteract one another, with full-load output they act in the same sense upon the load, so that the backlash or play between the drive, the gearing and the load is eliminated. As the motors there are used compound motors... | 07/03/1984 |
| 4350219 | Battery powered electric motor vehicle The battery energized electric motor vehicle has a main driving motor connected to the battery via a footpedal operated control circuit; an auxiliary electric motor for a steering device is connected to the battery in series with the main driving motor an... | 09/21/1982 |
| 4309642 | Device for feeding a wire electrode Device for feeding a consumable wire electrode. Two feeding units are mounted in tandem. Each of the feeding units is provided with a pair of rolls and coupled to a direct current motor driving one of the rolls in the pair. The two motors are connected in... | 01/05/1982 |
| 4289997 | Drive apparatus having at least two electric motors A drive apparatus has at least two electric motors. There is also a central control common to all motors which lie in series in a closed-circuit energy supply. Each motor has an individual control unit which can be turned on and off from the central contr... | 09/15/1981 |
| 4271379 | Web fed printing press motor control A web fed press has at least one press unit including a first web driving means driven by a first motor. Downstream from the press unit is a second web driving means, such as nip rolls, driven by a second motor. Encoders are associated with the motors to ... | 06/02/1981 |
