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Patent Searching and Data


Matches 251 - 300 out of 11,385

Document Document Title
WO/2001/041294A1
A stepper motor controller and method for controlling the motion of a stepper motor by selectively energizing the motor's windings so that the current level in the windings match a desired current profile. The motor controller comprises ...  
WO/2001/039359A1
An apparatus for and method of monitoring the operation of a stepper motor used to control the main burner valve of a gas appliance. The gas appliance has a pilot burner. A thermopile thermally coupled to said pilot burner produces an el...  
WO/2001/033710A1
A method and apparatus for driving a stepper motor such that when the motor is stepped, the velocity of the motor is substantially zero upon reaching a new stepped position, thereby eliminating overshoot and ringing, and the wasted energ...  
WO/2001/031773A1
The invention relates to a driver circuit to allow a stepper motor, or multiple stepper motors, having windings arranged to operate at a nominal voltage, to operate from a supply voltage higher than the nominal voltage.  
WO/2001/010011A1
A permanent magnet DC variable length driven electric motor (not shown) is typically used to actuate the mechanism of a vehicle rear view mirror (not shown). When the rotating portion of such a motor is rotating as a result of the applic...  
WO/2001/006635A1
A system and method for controlling a stepper motor wherein the amount of memory space needed to store a phase table is minimized. The stepper motor controller (100) comprises a memory (110) sized to store data representing a plurality o...  
WO/2001/003959A1
The invention concerns a heating, ventilating and/or air conditioning device comprising at least one mobile element (3, 4,...) whereof the displacement is controlled by a single-pole motor (M¿1?, M¿2?...) powered by a control device (C...  
WO/2001/001558A1
The invention concerns a method for setting an electric motor, which consists, during a non-powering sequence of at least one of the motor (1) phases, in measuring on a predetermined time window (15), the induced voltage (Ti) in the non-...  
WO/2000/030244A1
A stepping motor control method using an encoder, wherein a timer means is provided, and an excessive advance of a phase at a low rotation is restricted to attain a high speed without compromising a stability at a low rotation by driving...  
WO/2000/018001A1
The invention relates to a nominal current generating device designed to be used especially in a step motor control device. Said nominal current generating device comprises a table (2) from which the support points of an approximation fu...  
WO/2000/016472A1
In a stepper motor driver, a rotation detector unit determines whether the stepper motor is rotating. When the rotation detector unit detects the stepper motor at a stop, the control unit operates to increase the effective driving power ...  
WO1999027644A3
In a multiphase motor driver, each phase current is controlled by the ratio of measurements across a common sense element. By utilizing the same sense element for each phase, inaccuracies which result from the variance among multiple sen...  
WO/1999/038250A1
A stepping motor control device, wherein a micro-stepping drive part (16) is selected in a first operation mode, the output from the micro-stepping drive part (16) is applied to a drive part (21) through a command value selector (12), an...  
WO1999018655A9
A system for controlling a stepper motor is disclosed that includes a microprocessor (16) for directly generating current command signals. The microprocessor (16) is of the type having memory (34, 36) wherein the memory includes two tran...  
WO/1999/030411A1
A device for feedback controlling a stepper motor, enabling high speed drive. A slit in a disc secured to the rotor of a stepper motor is located before the position, where the rotor is stable magnetically, in the rotational direction of...  
WO/1999/027644A2
In a multiphase motor driver, each phase current is controlled by the ratio of measurements across a common sense element. By utilizing the same sense element for each phase, inaccuracies which result from the variance among multiple sen...  
WO/1999/018655A1
A system for controlling a stepper motor is disclosed that includes a microprocessor (16) for directly generating current command signals. The microprocessor (16) is of the type having memory (34, 36) wherein the memory includes two tran...  
WO/1999/008375A1
An electronic device in which the fast forwarding of a stepper motor is performed as in a time measuring instrument and which is provided with a detecting coil wound coaxially with a rotor driving coil to detect a reversely induced volta...  
WO1998037624A3  
WO/1998/051002A1
An H-Bridge motor controller having a floating, electrically isolated high side FET driver design where the motor driver circuitry is electrically isolated from the logic circuitry. Back EMF generation during motor operation is minimized...  
WO/1998/040252A1
The invention relates to a windscreen-wiping device (10) and method according to which an operating windscreen wiper (12) is accurately positioned in each reverse position (U1, U2), taking into consideration local conditions on the winds...  
WO/1998/037624A2
The invention relates to a direct drive with internal sensors to detect linear, planar and/or rotating movements which operate according to the step motor principle, or to the usual rotary step motors. Hall-effect sensors are arranged in...  
WO/1998/035436A1
The present invention concerns a method and device for controlling a stepping motor. According to the inventive system, a central processing unit (CPU) determines on the basis of a sinusoidal table and within a scanning time which remain...  
WO/1998/024169A1
A stepping motor in which the rotation of a rotor (22) composed of a permanent magnet can be suppressed in an excellent state even when no drive signal is supplied to exciting coils and which is provided with open loop-like exciting coil...  
WO/1998/018200A1
The present invention pertains to the operating mode of stepping motors, where the moment of resistance (M) temporarily changes fo a substantially equal number of rpm (D). The temporary characteristic curve (28) of the moment of resistan...  
WO/1998/005116A1
A process is disclosed for recognising the step of stepping motors by analysing the current that flows through the motor, without using any sensors. In order to overcome the problems caused by the use of a shunt resistance, the resulting...  
WO/1998/000637A1
An inductive load driving device and a method for driving the same device in which the rise of load current at an initial stage of driving can be executed at high speed. To this end, the device comprises a plurality of step-up circuits (...  
WO/1998/000684A1
A stepping motor-type instrument (6) having drive circuits (3, 4) for driving a stepping motor based on digital signals corresponding to a measured quantity, wherein a needle (9) attached to an end of a drive shaft of the stepping motor ...  
WO/1997/047075A1
The present invention relates to a piezoelectric linear step motor which comprises a cylindrical body (1) and a mobile part (4) as well as fixation units mounted between them. The fixation units comprise at least two piezoelectric units ...  
WO/1997/038285A1
A measure obtained by a counting circuit (2) is converted by a processing circuit (3) to an indication angle signal at a predetermined conversion cycle. A smoothing circuit (4) comprises a division circuit (11) for calculating the differ...  
WO/1997/038487A1
A phase locked driving type motor is reliably started and stably rotated. A motor driving device is provided with a stepper motor constituted at least of a bipolar stator, a rotor with a bipolar permanent magnet, and a driving coil magne...  
WO/1997/037425A1
The invention concerns a system for detecting abutment and blocking in a stepped motor, the system determining a parameter from the variation of an actual motor variable and comparing it with a reference value, an abutment and blocking d...  
WO/1997/037416A1
The invention concerns a process for detecting abutment and blocking in an electric motor, in particular a stepping or commutator motor. By measuring the current, a parameter is determined as an abutment or blocking detection signal from...  
WO/1997/024797A1
In a method of generating a clock signal having a desired frequency, a pulse is generated each time a stored accumulator value (tank) is found to be greater than or equal to a stored (trigger) value. In a first loop (10), the stored accu...  
WO/1997/013317A1
Projections (15a), semi-projections (16a), and recesses (18a) all having a width of an electrical angle of 120� are provided to the periphery of a conductor disk (15) which rotates synchronously with a motor. A coil (10a) which only fa...  
WO/1997/011266A1
Described is a method and device for the control of an actuator element, in particular an actuator element subject to fixed-cycle control in an internal-combustion engine. The control-signal frequency is adjustable to avoid resonance eff...  
WO/1997/011524A1
A method for estimating and controlling the rotor position of a SR motor comprises the steps of sampling phase current(s) (53) and estimating phase flux(es) (54) from at least one conducting phase of the SR motor, sampling phase current(...  
WO/1997/010642A1
A motor control system that reduces noise while reducing power requirements but providing sufficient torque. A one-phase-on drive mode modified to microstep between "one phase on" positions is used to accelerate the motor in a non-linear...  
WO/1997/000554A1
A method and a device are proposed for actuating a step motor. The step width and direction of rotation of the step motor (9) are determined in a control device (13) and forwarded to a control system (20) for actuating the step motor (9)...  
WO/1996/032067A1
A surgical system, adapted to operate with at least one surgical device, has a handpiece containing a motor which is adapted to receive the surgical device. The surgical device is driven through a continum of positions by the motor outpu...  
WO/1996/018237A1
A motor driver which can stably rotate at least a bipolar motor and has a simple constitution. The motor driver has a circuit which biases the voltage at one end of the driving coil of a motor to an intermediate potential of the power su...  
WO/1996/015583A1
A method and apparatus for increasing the top speed of a brushless DC motor (BLDCM) or a closed loop step motor (CLSM) which are driven by substantially sinusoidal signals on each of their leads. An additional is generated which has a fu...  
WO/1996/001412A1
Proposed is a method of reducing the magnitude of an uncontrolled movement of an instrument pointer (14) driven by a step motor and which lies against a mechanical stop (11) when the motor (14) is switched off. To achieve this, the stren...  
WO/1995/018994A1
A process is disclosed for correcting a non-linear relation between the electric phase angle and the mechanical output angle of step motors by using a low resolution encoder or the like. This process represents a compromise between the c...  
WO/1995/017038A1
A light beam, which scans in opposite directions across a bar code (24), is controlled in velocity and scan angle by monitoring the voltage across a winding (12) of a motor (10), such as one of the phase windings (12) of a two phase step...  
WO/1995/014327A1
The proposed drive circuit for an electronically switched electric motor such as a stepping motor comprises a full bridge circuit (I, II) for each motor winding (L1, L2), a current sensor resistance (R), a storage unit (C5) for storing m...  
WO/1995/009104A1
A bag neck tying device for tying a ribbon (15) dispensed from a spool (41) about a gathered neck. A pulley (24) and proximity switch (86) are mounted to prevent the completion of a tying cycle if a bag neck is not properly gathered and ...  
WO/1994/008279A1
A process for rapidly controlling a step motor without step losses should at the same time allow a high resolution to be obtained at the target. A step angle table precalculated for the specific system gives per interval/step the step an...  
WO/1994/007289A1
The proposal is for a process and a circuit arrangement for electronically monitoring overloads on electric motor drives in which speed monitoring is used as well as the prior art method of true output monitoring. This also makes it poss...  
WO/1993/023918A1
A variable reluctance drive system including a motor and corresponding converter for improved current commutation. The motor incorporates a salient pole rotor (16) and a salient pole stator (10) having one or more full pitch windings (20...  

Matches 251 - 300 out of 11,385