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Patent Searching and Data


Matches 601 - 650 out of 22,569

Document Document Title
WO/2004/098261A2
A controller (28) for a doubly fed induction generator (12, 20) adjusts control signals to a rotor side converter (24) and line side converter (22) to adjust rotor current when a voltage transient on a utility grid (10) occurs, so that t...  
WO/2004/093287A1
A variable speed drive control system operates a variable speed drive to power a first load from a power source simultaneously powering a second load. An AC reactive power is monitored which may comprise or consist of an AC reactive powe...  
WO/2004/084397A2
Current through a motor (18) is sensed at (26) to create a voltage which is amplified at (30). The amplifier (30) is followed by a high pass filter (38) and a low pass filter (46). This recovers commutator pulses from the motor current, ...  
WO2004070882A3
A multiphase motor has a plurality of ferromagnetically isolated stator electromagnets distributed about an axis of rotation. Successive ranges of speed during which the motor can be expected to operate are defined. A specific subset of ...  
WO2004072130A3
According to the invention, for a simple actuator, the cumulative rotational angle of the rotor is calculated from the current operating values of the direct current motor, from a starting point at which a supply voltage is applied to th...  
WO2004068691A3
Disclosed is a method for triggering an electric motor by means of a pulse width modulation signal that has a specific triggering frequency and a specific pulse duty factor. The electric motor is triggered via a supply voltage line accor...  
WO/2004/078508A1
The invention relates to a driving assembly comprising a wheel comprising a wheel shaft and driving means which when operative exert a driving moment on the wheel shaft, wherein a drive ratio, being the arm of the driving moment divided ...  
WO/2004/072130A2
According to the invention, for a simple actuator, the cumulative rotational angle of the rotor is calculated from the current operating values of the direct current motor, from a starting point at which a supply voltage is applied to th...  
WO/2004/070932A1
The invention relates to a method for reducing line-bound disturbances in pulse-width modulated control of an electric motor. A controlled pulse-width modulation signal in a clock cycle comprises one or several signal edges between a fir...  
WO/2004/070882A2
A multiphase motor has a plurality of ferromagnetically isolated stator electromagnets distributed about an axis of rotation. Successive ranges of speed during which the motor can be expected to operate are defined. A specific subset of ...  
WO/2004/070719A1
The invention relates to a tray mechanism consisting of sliding means comprising an electrical tray motor, for moving a tray - provided for containing a disc (for example an optical disc) on which information is recorded - from a project...  
WO/2004/068691A2
Disclosed is a method for triggering an electric motor by means of a pulse width modulation signal that has a specific triggering frequency and a specific pulse duty factor. The electric motor is triggered via a supply voltage line accor...  
WO/2004/064243A1
A device for controlling variable speed electric motors, particularly for hand held power tools and other miniaturised electrically powered apparatuses, comprises an electronic driver unit (5) connectable to the terminals (2, 3) of an el...  
WO2004045059A3
A permanent magnet motor includes salient pole stator cores. The poles and/or linking portions therebetween are wound with a plurality of winding coil sets. Mutually exclusive speed ranges are established between startup and a maximum sp...  
WO/2004/055960A1
A rotating electrical machine, such as an aircraft starter-generator, includes an exciter that has its stator windings divided into a number of sections. A plurality of switches are electrically coupled to the exciter stator winding sect...  
WO2003084044A3
A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The n...  
WO/2004/049550A1
A speed controller for motor comprising a speed control section (12) for generating an original current command based on the difference between a detected speed of a motor (4) for driving a load (2) and a speed command of the motor (4), ...  
WO/2004/049551A1
A power control system (12) for an electric motor having at least one magnetic bearing includes a DC/DC converter (18) supplied from a DC link bus (179) connected to a main power supply (14), the bus (17) supplying power for the electric...  
WO/2004/045059A2
A permanent magnet motor includes salient pole stator cores. The poles and/or linking portions therebetween are wound with a plurality of winding coil sets. Mutually exclusive speed ranges are established between startup and a maximum sp...  
WO2004010762A3
An insect control system for controlling insects within a predetermined area (20). The system includes a plurality of insect control devices distributed throughout the predetermined area, the insect control devices including at least one...  
WO/2004/040746A1
Provided is a motor control circuit in which the circuit structure is not complicated, which has a favorable response to the phase difference signal, and in which the signal variation caused by heat is small. This rotation control circui...  
WO/2004/040747A1
The invention relates to a commutation method for an electric motor, especially a direct-current motor without a commutator, using a semiconductor bridge circuit consisting of switching elements (T1 to T4) and respectively parallel freew...  
WO2003100957A9
A power converter (500) for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor including first and second partial circuits (553, 554) for forming multiple conduction circuits in cooperation with first a...  
WO2003100956A9
A method for identifying an operational phase of a motor (203) may include obtaining a first value of a signal that is indicative of the operational phase of the motor (203) and obtaining a second value of the signal after a period of ti...  
WO2004001515A9
A system and method for measuring fluid or gas flow rate, for the system where fluid or gas is pumped, such as gas monitoring instrument, via a conduit to a sensor. The flow of gas through a pump (14) is determined by measuring motor bac...  
WO2004004109A9
A system for controlling an electric motor comprises, in one embodiment, an encoder; a central processor in communication with said encoder; a module processor in communication with said central processor; feedback circuitry in communica...  
WO/2004/030200A1
A brushless DC fan motor capable of communicating with an external apparatus while simplifying the circuitry. A speed control command generating means (9) generating a command for controlling the rotational speed of the rotor comprises a...  
WO/2004/023639A1
A drive system for a three phase brushless motor uses an algorithm for position sensing which measures the inductance in the motor phases and determines the position from the measured inductances. In order to reduce acoustic noise, the i...  
WO2004001515A3
A system and method for measuring fluid or gas flow rate, for the system where fluid or gas is pumped, such as gas monitoring instrument, via a conduit to a sensor. The flow of gas through a pump (14) is determined by measuring motor bac...  
WO2003100948B1
A two-phase switched reluctance motor (fig.4) with a pluraty of rotor poles (404) having asymmetric reluctance (405) about a central raidla axis of the respective rotor pole and a plurality of salient stator poles (402) having the same w...  
WO2003038985A3
Aspects of a current controlled motor amplifier system (100) are provided. These aspects include a current source motor amplifier (100) comprising current source means on each leg of a top half (102) of the H bridge configuration and swi...  
WO2003100957A3
A power converter (500) for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor including first and second partial circuits (553, 554) for forming multiple conduction circuits in cooperation with first a...  
WO/2004/010762A2
An insect control system for controlling insects within a predetermined area (20). The system includes a plurality of insect control devices distributed throughout the predetermined area, the insect control devices including at least one...  
WO/2004/008617A1
A system (10) provides a variable output voltage to a DC brush motor. The system includes a DC brush motor (14), a DC voltage source (12), a step-up, step-down DC/DC converter (16) including a switch (18). The DC/DC converter is construc...  
WO/2004/004109A2
A system for controlling an electric motor comprises, in one embodiment, an encoder; a central processor in communication with said encoder; a module processor in communication with said central processor; feedback circuitry in communica...  
WO/2004/001515A2
A system and method for measuring fluid or gas flow rate, for the system where fluid or gas is pumped, such as gas monitoring instrument, via a conduit to a sensor. The flow of gas through a pump (14) is determined by measuring motor bac...  
WO2003077322A3
A block diagram of circuitry, including control circuits contained within package (33). Thus, MOSFETS (31) and (33) are provided with respective shoot-thru protection circuits (61) AND (62) respectively and with over current shut down ci...  
WO2003050846A3
A selectively protected electrical system includes or operated with a power source(1514) , a load (1512), a power driver circuit (1506) for controllably transferring power from the power source (1514) to the load (1512), the power driver...  
WO/2003/100944A1
A rotor for an electrical motor (100) may include a plurality of salient radial field rotor poles (109) and a plurality of salient axial field rotor poles (110). The radial field rotor poles (109) and the axial field rotor poles (110) ar...  
WO/2003/100957A2
A power converter (500) for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor including first and second partial circuits (553, 554) for forming multiple conduction circuits in cooperation with first a...  
WO/2003/100948A1
A two-phase switched reluctance motor (fig.4) with a pluraty of rotor poles (404) having asymmetric reluctance (405) about a central raidla axis of the respective rotor pole and a plurality of salient stator poles (402) having the same w...  
WO/2003/100956A1
A method for identifying an operational phase of a motor (203) may include obtaining a first value of a signal that is indicative of the operational phase of the motor (203) and obtaining a second value of the signal after a period of ti...  
WO/2003/100958A1
A power converter for a switched reluctance motor (SRM) or a permanent magnet brushless direct current (dc) motor (PMBDCM) that includes a front-end boost partial circuit (551) for connecting with a first phase winding of the motor (552)...  
WO2003003556A3
The aim of the invention is to produce, in the most economical way possible, a control device for DC motors that are provided with a commutator for feeding the motor windings that has at least four sliding contacts. Said control device c...  
WO2003071669A3
The aim of the invention is to avoid the creation of narrowband stray radiation spectra caused by a pulse-width modulation control system (5) of a d.c. motor (1). To this end, switching means (8) are used to modulate the clock pulse freq...  
WO/2003/090336A1
In particular in articles of furniture having at least an element which may be adjusted with a DC motor, preferably via a mechanical transmission, it is desirable to have a level of acoustic noise as low as possible. The power supply to ...  
WO/2003/087855A1
The invention relates to a method for measuring currents in a motor controller. Some current sensing devices placed on the motor wires or inside the motor controller provide low amplitude output signals thus complicating sampling and dat...  
WO2003030364A3
The invention relates to a control device for operating a load circuit provided with an inductive load (m), comprising a control stage (14) producing a pulse-width modulated control signal with measuring disconnection intervals provided ...  
WO/2003/088469A1
Pulse variable information is used to control at least obstacle detection and also, optionally, speed of movement of a movable barrier. In one embodiment, pursuant to a learning mode (50) the movable barrier is moved (51) and, while movi...  
WO/2003/084798A1
An apparatus for diagnosing the fault of a motor current sensing unit of a motor-driven power steering apparatus. Semiconductor switching devices (hereinafter referred to as devices) (T1 and T4) of an H bridge circuit constituting a moto...  

Matches 601 - 650 out of 22,569