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| Number | Title | Issue Date |
| 7746017 | Fan driving system with safe driving current switching An exemplary fan driving system includes a driving device and a MOSFET group. The driving device includes a first adjustable resistor connected between its first voltage signal input terminal and ground, and a second adjustable resistor connected between its second ... | 06/29/2010 |
| 7525273 | Robot control system A robot control system including a servo amplifier supplying power to a robot, a processor controlling the operation of the robot, and a servo power connection/cutoff circuit connected to the same, issuing excitation/nonexcitation commands to a charging relay and a ... | 04/28/2009 |
| 7265513 | Variable reluctance electric power system A variable reluctance electric power system which comprises an alternator and a motor having a rotor with longitudinal lobes and no windings, commutators, slip rings, magnets, or laminations. The alternator and the motor have stators which have conventional windings... | 09/04/2007 |
| 6998804 | Electric motor with electronic brake A retarded electric motor designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as seri... | 02/14/2006 |
| 6910646 | Aggregate spreader and methods of use An aggregate spreader having a container, a mounting flange, and a spreading assembly is provided. The container has an aggregate receiving cavity. The mounting flange extends from the container to removably connect the container to a stick of a tractor so that the ... | 06/28/2005 |
| 6741047 | Dual current-limiting circuit for DC brushless motor A dual current-limiting circuit for a dc brushless motor includes an over-current detective circuit, an operation detective circuit, and a current-limiting circuit. The over-current detective circuit produces a voltage signal used to determine whether an over-curren... | 05/25/2004 |
| 6504338 | Constant CFM control algorithm for an air moving system utilizing a centrifugal blower driven by an induction motor A method and apparatus for achieving constant air flow rate economically utilizes an induction blower motor with control settings determining the motor excitation voltage. A memory stores, for a variety of motor speeds, a graph of the speeds plotted again... | 01/07/2003 |
| 6181098 | DC motor control circuit A stop control circuit is configured from a hardware circuit that operates independently from a CPU. When a comparison circuit outputs a matching signal, then the stop control circuit starts processes for stopping a DC motor, regardless of the processing ... | 01/30/2001 |
| 5939850 | Circuit for driving polyphase motor A circuit for driving a three-phase brushless DC motor (301) includes a neutral point feedback circuit (201) which operates a three-phase output circuit (202) so that a neutral point potential (VC) of the motor (301) is maintained at a predeter... | 08/17/1999 |
| 5703451 | Motor driving circuit Between one end of a motor coil and the ground, a drive transistor is connected. When the drive transistor is turned off, and in particular at the moment when a current flowing through the motor coil drops to zero, a back electromotive force is induced at... | 12/30/1997 |
| 5606230 | Direct current drive system A Direct Current drive system with a multiplicity of applications including that of powering electric vehicles. The system contains a hybrid electric motor formed by a unique synchronous arrangement of two electrical motors, a primary and a secondary. The... | 02/25/1997 |
| 5598072 | Regenerative braking circuit utilizing separately excited motor A separately excited DC motor system is arranged to provide operation in a smooth, continuous electrical retarding mode. A series contactor connects the motor armature to a DC power source and is controlled so as to immediately open upon sensing of a need... | 01/28/1997 |
| 5327056 | Circuit configuration for limiting the cutoff voltage on a servomotor A circuit configuration for limiting the cutoff voltage occurring in controlling a servomotor (M) by means of width-modulated DC pulses comprises a power transistor (T2) which, via a capacitor (C) is connected through for a short time when a cutoff voltag... | 07/05/1994 |
| 5325033 | Circuit arrangement for influencing the start-up and/or braking behavior of three-phase A.C. non-synchronous motors In a circuit arrangement for influencing the start-up and/or braking behavior of three-phase a.c. non-synchronous motors having phase windings (5, 6, 7), which are connected in star for continuous operation and have terminals for the phase conductors (1, ... | 06/28/1994 |
| 4551658 | D.C. Motor with centrifugal separation starting brush A D.C. motor includes a brush and commutator used in starting the motor, but which are not used during the running cycle of the motor. The rotor is formed of a permanent magnet. The stator includes a pair of opposite pole driving coils arranged 180° from... | 11/05/1985 |
| 4520279 | Series transistor chopper A transistor chopper for controlling the power delivered to a DC load from a DC source includes two or more transistors connected in series between the DC source and the load and means for controlling the voltage across each transistor so that the transis... | 05/28/1985 |
| 3973177 | Motor speed control device A system for controlling the speed of a direct current motor. The system employs a pair of breaker points for opening and closing the circuit containing the motor. By varying the frequency of contact between the breaker points and the period of time the p... | 08/03/1976 |