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Patent Searching and Data


Matches 501 - 550 out of 13,506

Document Document Title
WO2002051592A8
A speed controller operates a DC-powered fastener drive assembly to efficiently drive fasteners from a DC power supply (22), thereby achieving a fully portable hand tool. In particular, the speed controller accelerates a flywheel (28) wi...  
WO/2003/028200A2
A method and apparatus for controlling a barrier movement operator comprising a controller (18) that dynamically controls barrier operator braking to electronically slow, stop or reverse the motor in the barrier operator controller. The ...  
WO/2003/019314A1
A synchronous electric motor sensorless control device for driving a synchronous electric motor without using any rotational position measuring device. The sensorless control device comprises a relative position counter (4) for resetting...  
WO/2003/009462A1
The invention relates to a method and a device for shutting down a drive during a mains failure, said method and device comprising a matrix converter (2), several commutation capacitors (C1, C2, C3) on the mains side, a switch unit (10) ...  
WO/2003/007466A1
A DC motor drive circuit for stabilizing the rotation of the DC motor just after power supply and for preventing its reverse rotation just after a stop of power supply. As the circuits for supplying a power source voltage to a DC motor (...  
WO/2002/095926A1
The invention relates to an embodiment and the use of synchronous motors as actuators inside an actuation range which is defined by end stops, for valves and flap valves for example. According to the invention, the phase position and/or ...  
WO/2002/093730A1
A charge and discharge control device, wherein S1 used as a switching element for pressure rising and S2 used as a switching element for pressure lowering are turned on and off alternately with a dead time provided therebetween irrespect...  
WO/2002/091558A1
A system for controlling a synchronous motor, comprising a current sensor for measuring the electric current of a synchronous motor; a coordinate transformer for coordinate-transforming the electric current measured by the current sensor...  
WO/2002/081153A1
The invention relates to a hand-held machine tool, comprising an electric motor (12) mounted in a housing (10) via which a tool bit (16) disposed in a tool holder (14) can be rotatably driven, and a protective device (18) by which a char...  
WO/2002/082613A1
When abnormal current due to jamming is detected through motor current (ID), the motor current (ID) performs an operation in which an ON/OFF operation and a continuous ON operation are repeated, so that increment of the motor current (ID...  
WO2002050618A3
A power generation system is disclosed having several embodiments such as in one embodiment, the power generation system includes a fuel source to provide fuel, a turbogenerator (200), coupled to the fuel source, to generate AC power, an...  
WO/2002/051591A1
A control module (18) advantageously reduces cost and enhances reliability, design flexibility, ease of assembly, and performance of a flywheel operated hand tool (10). The control module (18) includes a thin film printed circuit with no...  
WO/2002/051592A1
A speed controller operates a DC-powered fastener drive assembly to efficiently drive fasteners from a DC power supply (22), thereby achieving a fully portable hand tool. In particular, the speed controller accelerates a flywheel (28) wi...  
WO/2002/050618A2
A power generation system is disclosed having several embodiments such as in one embodiment, the power generation system includes a fuel source to provide fuel, a turbogenerator (200), coupled to the fuel source, to generate AC power, an...  
WO/2002/041485A1
The present invention discloses devices and methods for improved starting and stopping of rotary motors. A rotary electrical machine (3) is supplied with a voltage from a voltage supply (10). The magnitude of a phase current is measured....  
WO/2002/037662A1
The invention relates to the circuit arrangement of an electromotor comprising two terminals, in which the electromotor can be actuated for operation in both rotational directions. When no current is supplied to the electromotor, one of ...  
WO2001043270A3
The invention relates to a drive system for driving a set of machines (2, 3, 4) that are each provided with a rectifier (6). According to the inventive drive system, the inputs (7) to the control devices (8) of the drive motors of the ma...  
WO/2001/095474A1
The invention relates to a method for determining the position of an element driven by the direct current motor within a predetermined displacement trajectory between two block positions, by evaluating the current fluctuations contained ...  
WO/2001/086799A1
The invention relates to a circuit arrangement for guaranteeing the defined switching-off behaviour of synchronous servomotors. According to the invention, the phase position of the voltage on the two motor coils (2.1) is measured and th...  
WO/2001/073913A1
The invention concerns a device for stopping the motor when the load on the motor exceeds a predetermined value. It comprises means (D1, DZ, R1, R2) transforming the voltage variation at the phase-shifting capacitor terminals correspondi...  
WO/2001/071902A1
The invention relates to a brake module for an asynchronous motor. The inventive module is especially used in a circular saw. The aim of the invention is to obtain braking that is as smooth and silent as possible regardless of the moment...  
WO/2001/069747A1
The invention relates to a method for monitoring and influencing an electric motor, in particular, arranged on a displaceable object on a motor vehicle, such as a window or sunroof. The aim of the invention is to resolve the technical pr...  
WO/2001/043270A2
The invention relates to a drive system for driving a set of machines (2, 3, 4) that are each provided with a rectifier (6). According to the inventive drive system, the inputs (7) to the control devices (8) of the drive motors of the ma...  
WO/2001/039187A1
When quick deceleration is not required, a deceleration method with a small power consumption can be selected. Even when a disk is required to be stopped during decelerating the disk by the method, the disk can be stopped promptly and re...  
WO/2001/017096A1
A generator is disclosed. The generator which includes a shaft; an electromagnetic bearing for rotatably supporting the shaft; an auxiliary bearing for supporting the shaft in the event of failure of the electromagnetic bearing; a sensor...  
WO/2000/067254A1
The invention relates to a motion control system for driving a motor-driven device precisely to a predetermined position in a short time. More particularly, this invention relates to a CD-carousel loader having a precise and short access...  
WO/2000/055963A1
The invention prevents a voltage change dv/dt of an inverter from directly causing an erroneous firing of a semiconductor brake switch, which may short-circuit the inverter during operation. To brake a motor (10) driven by an inverter wh...  
WO/2000/043167A1
A robot device capable of natural, autonomous motion, which has motion-induced emotional instinct models and is provided with a control means (32) for determining its motion by changing an emotional instinct model based on elements of in...  
WO/2000/041294A1
The invention relates to a mains braking device for a line-powered power tool. Said braking device comprises a circuit arrangement with a two-polar switch which switches between the motor mode and the braking mode. The inventive braking ...  
WO/2000/036741A1
The invention relates to deceleration in an induction machine (2) comprising a stator which is connected to a single-phase or multi-phase a.c. system (L1, L2, L3) via an a.c. power controller (4) which can be controlled by phase control....  
WO/2000/036731A1
The invention relates to a drive unit for units of a motor vehicle such as window lifters,wipers or the like, comprising an electric motor (10), a power switch arranged in the electric power circuit of the electric motor (10) and a contr...  
WO/2000/031413A1
Wind turbines are generally provided with an active driving system for orienting them according to the wind direction. This driving system rotates the wind-turbine nacelle so that the rotor blades are oriented in the wind direction. The ...  
WO/2000/014843A1
The invention relates to a method for moving a movable vehicle part between at least two positions, wherein the vehicle part is driven by an electric motor (10), a pulse signal corresponding to the rotational movement of the electric mot...  
WO/2000/014863A1
A controller for motor driven by means of an inverter device which outputs variable-voltage variable-frequence AC power, wherein, in order to minimize the time required from the input of a deceleration commande to the stoppage of a motor...  
WO/2000/014844A1
The invention relates to a method for moving a vehicle part between at least two positions, wherein the vehicle part is driven by an electric motor, pulse signals corresponding to the rotational movement of the electric motor are generat...  
WO/2000/011691A1
The invention relates to a switch (4) for electric tools with electrical braking systems, comprising an electric motor with at least one field winding (3) and one armature (2). The switch (4) has switching contacts (S1,S2) that switch be...  
WO/1999/063643A1
A power tool (18), including a braking and control circuit (10). The braking and control circuit (10) includes a microcontroller-based control means circuit. The microcontroller assures control of switch means, such as triacs, switches a...  
WO/1999/049563A1
An induction machine (20) adapted for variable speed operation, including low and zero speed, comprising: a polyphase stator having two separate stator windings (abc, xyz) with separate input terminals for each winding by which drive pow...  
WO/1999/033163A1
A motor controller unit (9) includes an operating program that controllably responds to manual motor start (17) and stop (18) commands for protection of the semiconductor switches (21-23) connected with each phase of a multi-phase electr...  
WO/1999/017172A1
An electronically controlled mechanical clock provided with a voltage control oscillator (25) including a generator (20) for generating electricity by a rotor (12) that rotates by using a coil spring (1a) as a power source and a brake ci...  
WO/1999/017171A1
A rotation control apparatus that governs the speed of a rotor (103), wherein a phase difference compensation means (118) outputs a phase difference compensation signal (119) acoording to the phase difference between a rotation signal of...  
WO/1999/017414A1
The invention relates to a method for detecting and disconnecting a jammed or overloaded permanently excited direct current engine. The operational status of the engine is detected by measuring the voltage (Ug) between the engine termina...  
WO/1999/014835A1
The present invention relates to a control system that uses an electric motor which can be controlled through a final stage. A control circuit including a micro-processor is associated to the final stage and provides a pulse-width modula...  
WO/1999/010975A1
Electric motors, especially gear motors, are often equipped with electromagnetically actuated mechanical brakes. According to the invention, a unipolar voltage which varies within a time period is generated by a power supply unit (2) in ...  
WO/1999/001926A1
A system is known by which a cycle converter-controlled electric motor can be made to run at a generator speed and the electric power generated by said motor can be transformed into heat. Further electric motors are known which are provi...  
WO/1998/056103A1
A control apparatus for use with a motor (70) driven by a D.C. power source (72). A controller (100) controls PWM duty cycle of a motor FET drive (66) in response to a detected depression on an accelerator pedal. The power source (72) is...  
WO/1998/029939A1
An adjustable speed control for use on a children's ride-on vehicle, where the speed control includes a switch assembly (32) interposed between battery (24) and motors (20, 22) of the vehicle. Switch assembly (32) is selectively operable...  
WO1998006595A3  
WO/1998/006595A2
A braking system for a vehicle powered by DC motor, such as a battery powered locomotive, is arranged to connect a bridging conductor (16) across the motor to brake the vehicle in an emergency. The system engages when the armature voltag...  
WO/1997/043821A1
A method and a device for electrical braking of an all-mains motor by which disconnection of supplied feed current to the motor causes an electric switching operation, whereby electric current arranged to cause a reversed rotary directio...  

Matches 501 - 550 out of 13,506