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Class 318/519 - By armature or primary circuit-making and/or breaking


Subclass of Class 318 - Electricity: motive power systems
Definition: Subject matter in which means are provided for making and/or
No. of patents: 17
Last issue date: 06/29/2010


NumberTitleIssue Date
7746017Fan 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
7525273Robot 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
7265513Variable 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
6998804Electric 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
6910646Aggregate 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
6741047Dual 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
6504338Constant 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
6181098DC 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
5939850Circuit 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
5703451Motor 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
5606230Direct 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
5598072Regenerative 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
5327056Circuit 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
5325033Circuit 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
4551658D.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
4520279Series 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
3973177Motor 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
 
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