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Patent Searching and Data


Matches 151 - 200 out of 11,353

Document Document Title
WO/2005/043730A3
The frequency of the pulse width modulator within a step motor control circuit is increased above a base frequency under defined conditions to enable more accurate construction of the phase current waveform for reducing mid-range resonan...  
WO/2009/034252A2
The invention relates to a method for powering an electromagnetic actuator (1) that comprises a fixed member (2) and a mobile member (6) having facing portions respectively provided with permanent magnets (7) and coils (4), wherein the m...  
WO/2008/156541A3
A stepper motor driving a driven member is calibrated by periodically driving the member from its current operational position to an end stop of the driven member's total travel range; however, the driven member approaches the end stop i...  
WO/2009/033080A2
A method and computer program product for defining a PWM drive signal having a defined voltage potential. The PWM drive signal has a plurality of "on" portions and a plurality of "off portions that define a first duty cycle for regulatin...  
WO/2009/012542A1
Method for control of synchronous electrical motors with application for stepper and Brush-Less Direct Current motors for which there is an explicit relation between the active electrical power supplied to the motor and the mechanical po...  
WO/2008/155294A2
The invention relates to a method and a circuit arrangement for operating a brushless DC motor (10), having a rotor (14) excited by a permanent magnet and having different magnetic conductance values in different magnetic axes, particula...  
WO/2008/127826A1
A control apparatus for multiplexing a single distributed control amplifier to control multiple axes of motion in a multi-axis machine. In one example, the control apparatus comprises a distributed control motor amplifier, a first motor ...  
WO/2008/117744A1
A poly-phase load drive capable of driving a poly-phase load with a simple operation. A motor driver circuit (MDI) receives the supply of a control signal from each of first to fourth signal lines (SL1 to SL4) to drive a motor (M1). Firs...  
WO/2008/070382A3
Provided are a method, computer-readable medium, and system for automatically determining a proper operational current input to an electric motor. In an exemplary embodiment, a method for determining the proper operational current input ...  
WO/2008/084500A2
The present invention relates to noise reduction in stepper motors during homing without compromising the torque. The proposed method is to drive the pointer (1) at rated voltage during forward direction and then continue to drive at rat...  
WO/2008/045780A3
A microstepper motor device and method of controlling the device uses a microcontroller that provides current sinusoidal values from at least one array of sinusoidal values to power circuitry of the device in response to control signals....  
WO/2008/054931A3
A rotisserie cooking device for use with a cooking source includes a food holding member. At least one motor is operatively linked with the food holding member. At least one thermopile is associated with the motor. The at least one therm...  
WO/2008/074451A1
The invention relates to a method for controlling a step motor (3) for actuating a mechanical pat (2), comprising the steps of: receiving a position set-point signal (XC) of the mechanical part (2); generating a control signal (SC); outp...  
WO/2008/054687A3
The lead or lag relationship between the stator and rotor of a stepper motor is monitored on a continuing basis by an incremental encoder, in feed-back relation, and adjusts the lead or lag to within optimum range values to thereby preve...  
WO/2008/053640A1
Provided are a stepping motor drive control device and a drive control method capable of suppressing increase of the number of parts and generation of vibration and noise by a stepping motor by using simple control. The drive control dev...  
WO/2007/149908A3
A stepper motor is controlled by a driver having a constant and maximum frequency input in order to correct for camera shake. The need for variable frequency devices is eliminated, thereby reducing the cost and complexity of the system.  
WO/2008/044020A1
An electromotive machine (200, 900) comprises a rotor (230; 800; 920) and a stator (210, 220; 500; 600; 700; 910, 920). The stator (210, 220; 500; 600; 700; 910, 920) comprises a first group of primary windings (260a, 240b, 240d; 520; 64...  
WO/2008/034382A1
A stepper motor drive apparatus includes a control logic circuit module (20) and a stepper motor drive circuit module (30) connected with the control logic circuit module (20). Two output terminals as a group of several outputs of the st...  
WO/2008/018162A1
A driving method of a high speed rotation stepping motor exhibiting good starting performance, its driving circuit, and a vibration motor and a fan motor employing them. The motor driven electronic apparatus comprises a two pole flat sta...  
WO/2008/018417A1
A driving pulse generating unit (22) generates a driving pulse at a first pulse interval in response to such detection that a card detecting sensor (12) detects that a card is inserted into a time recorder. A driver (23) supplies a motor...  
WO/2008/013164A1
Provided are car-mounted head light control devices (1A, 1B), which are fed with a DC voltage (Es) for lighting discharge lamps (La1, La2) with square waves thereby to drive at least one of motors (M1, M2). The square waves to light the ...  
WO/2008/004605A1
To provide an electronic clock which has no erroneous determination of rotation detection and in which even if the second hand has a large moment of inertia, unnecessary current consumption can be suppressed. The electronic clock uses a ...  
WO/2008/001642A1
A pointer measuring instrument capable of indicating "zero" on an indication panel by a pointer even if a play (backlash) is present in gears. The measuring instrument comprises a pointer reference position setting means (7a, 7b) for det...  
WO/2007/138856A1
It is possible to obtain a high rotation accuracy and a high stop accuracy when driving a stepping motor for lens movement by the 1-2-phase excitation drive method. In a lens origin position detection process, when a lens holder has reac...  
WO/2007/129697A1
A valve control apparatus is provided with a stepping motor connected to a valve, and a motor control apparatus for controlling the stepping motor. The motor control apparatus is provided with a motor control section for feeding a pulse ...  
WO2007071057A8
A position controlled drive mechanism including an electric motor, an encoder associated with the rotatable shaft of the electric motor and a controller connected to both the electric motor and the encoder is described herein. The contro...  
WO/2007/089258A1
This invention detects a stall in a stepper motor by determining a motor winding current for each stepper pulse and determining if the winding current of a particular stepper pulse meets predetermined criteria. The motor winding current ...  
WO/2007/077936A1
A drive device includes: a 2-power source switching circuit for selectably connecting a high-voltage power source and a low-voltage power source to a power supply path to a motor coil; and a control circuit for controlling the 2-power so...  
WO/2007/077935A1
A vibration generation stepping motor stop control method performs stop control of a stepping motor for generating vibration by a control device. Supply of a drive pulse to the vibration generation stepping motor is stopped while applyin...  
WO/2007/071057A1
A position controlled drive mechanism including an electric motor, an encoder associated with the rotatable shaft of the electric motor and a controller connected to both the electric motor and the encoder is described herein. The contro...  
WO/2007/058069A1
A stepping motor for generating vibration in which the stopping position can be securely held by increasing a detent torque. The pole teeth of one stator yoke of a set of one-phase stator yokes are formed in two types of pole teeth with ...  
WO/2007/011454A2
A drive circuit apparatus for use in generating a drive signal for energizing an actuator about a natural resonant frequency is disclosed. The circuit has a counter that generates a count sequence derived from a drive sense signal. Addit...  
WO/2006/132115A1
An image pickup apparatus, which has a constant-voltage driven stepping motor, comprises a PWM waveform generating part (4) that generates pulse signals to be applied to switching elements (Q1-Q4); and a PWM waveform deciding part (3) th...  
WO/2006/129706A1
[PROBLEMS] To provide a motor driving circuit and a motor driving system wherein the circuit occupation area is small and the IC size can be reduced. [MEANS FOR SOLVING PROBLEMS] A polarity inversion data generating circuit is provided t...  
WO/2006/073492A2
A particle detector has a sample area of cross section no in excess of about 2 3 mm for containing environmental fluid, a light source on one side of the sample area for directing a collimated or nearly collimated beam of light through t...  
WO/2006/074120A2
Apparatus for reconstructing the phase currents of a multiphase load driven by a multiphase inverter fed by a DC link and controlled by a PWM controller, the apparatus including a sensor in the DC link, first and second sampling arrangem...  
WO2005043713A3
A method of controlling an electrical machine (10) having a stator (20) and a rotor (15). The stator includes a core (115) and a plurality of windings (112) disposed on the core in a three-phase arrangement. The three-phase arrangement i...  
WO/2006/021114A1
The invention relates to a motor control system (2) preventing high temperatures and large temperature variations on semiconductor components which are used to control brushless electric motors (1). When the loaded electric motor (1) rot...  
WO/2006/021075A1
A system and method for sensor less control of a stepper motor is described. The system and method includes estimation of the position of a rotor of the motor by way of sensing circuitry on the windings of the motor, without the use of p...  
WO/2006/018175A1
The aim of the invention is to provide an arrangement for driving a load element (7) (e.g. a transfer belt in an electrographic printing or copying device) which operates at a constant load angle even when the load acting upon the drive ...  
WO/2005/119377A1
No counter circuit is used but a simple arrangement is used to allow a motor to be rotation driven by main drive pulses in accordance with a load. A control circuit (103), after starting to use second main drive pulses to drive a motor (...  
WO/2005/113620A1
A biocompatible material which little causes interaction with biocomponents such as proteins or blood cells and is excellent in biocompatibility, that is, a biocompatible material consisting of a polymer obtained by polymerizing a monome...  
WO/2005/093533A1
A system and method is disclosed for controlling the input electrical current to an infusion pump stepper motor based on predetermined torque requirements. The system can include a motor controller and a non-volatile memory containing ex...  
WO/2005/076462A1
An electrically driven vehicle having a rotating electric machine small-sized and whose power generating characteristics and torque output characteristics can be changed and set to those appropriate for a vehicle condition. The electrica...  
WO2005013474A3
The current in each phase of a multi-phase step motor (9) is monitored and the excess phase current above the set point current, as required on a cycle-by-cycle PWM basis, is reduced thereby bringing each phase current down to the set po...  
WO/2005/070746A1
The invention relates to a method for determining a time mean of a pulse width-modulated current of an electric motor of a motor vehicle. According to said method, a plurality of measuring values of a measuring variable that has a known ...  
WO/2005/067136A1
[PROBLEMS] To provide a current limiter circuit and a motor drive circuit that prevent overcurrent from occurring when an external reference voltage generator circuit for detecting a prescribed current value is broken, thereby protecting...  
WO/2005/067134A1
A power transistor protecting circuit of a motor drive circuit, a motor drive circuit, or a semiconductor device, wherein when a breaking of wire exists between the output terminal of a power transistor and another end of an exciting coi...  
WO/2005/064782A1
[PROBLEMS] To provide a highly-reliable motor drive circuit or a semiconductor device capable of continuing drive operation of a power transistor by preventing flow of overcurrent into the power transistor when a current value detection ...  
WO/2005/060087A1
The invention concerns a method for powering a step motor comprising two rotors (16, 17) by supplying several pulse trains enabling the rotors to be rotated independently, one of the rotors (17) being adapted to rotate only in one direct...  

Matches 151 - 200 out of 11,353