Matches 251 - 300 out of 1359 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
6111380 System for detecting abutment and blocking in a stepped motor  
A stop and jamming detection system in a stepping motor determines a parameter from the profile of an instantaneous motor variable and compares it to a reference value. A signal for the stop and...
6108279 Stepping motor control device and method thereof and timepiece  
A device for controlling a stepping motor including a first drive pulse supply unit for supplying a first drive pulse to a drive coil for rotating a rotor. A rotation detecting pulse supply part...
6104113 Coil assembly for sensorless rotor angular position control of single phase permanent magnet motor  
A coil assembly for sensorless rotor angular position control of a single phase permanent magnet motor. The coil assembly is positioned axially adjacent one end of the motor's rotor core in...
6087798 Semiconductor integrated circuit device and disk drive apparatus  
A semiconductor integrated circuit device for use in a disk drive apparatus has a stepping motor driver for feeding an electric current to a stepping motor, a temperature monitoring circuit for...
6081091 Motor controller, integrated circuit, and method of controlling a motor  
A motor controller includes an input terminal (22), a frequency selective network, a first controller, and a second controller. The input terminal is adapted to be coupled to a drive phase of a...
6078457 Driving method for a stepping motor  
A method for driving a recording disc applies a DC excitation hold so that a rotor portion is stopped. Thereafter, a DC excitation frequency is gradually increased from a low frequency to a rated...
6075336 Drive mechanism for stepping motor in printer  
6073689 Actuator control apparatus  
When implementing an origin reset, operating conditions for the origin reset are corrected in correspondence to changes in operating conditions such as the source voltage to implement an accurate...
6072656 Stepping motor control method  
In a stepping motor control method having an object for correctly and relatively simply determining the position of a pseudo-track center in the dead zone of a stepping motor, a forwardly and...
6069726 Optical scanner  
An optical scanner includes a support frame which rotatably supports a mirror. A stepper motor is provided for turning a cam which abuts the mirror. The motor imparts force to the mirror to define...
6069466 Method for driving opening/closing member  
In an opening/closing member driving method in which the rotation of a motor rotatable in two directions is transmitted through a transmission member to an opening/closing member to thereby drive a...
6065231 Motor drive method and drive circuit  
There is disclosed a synchronous motor drive in which in a record disc drive of an information recording device a quantity of generated excitation noise is reduced to a small level to which a...
6064171 Host based stepper motor phase controller and method therefor  
The invention is a host-based stepper motor controller that reduces velocity overshoot and settling time. A typical embodiment of the invention will include a stepper motor, a carrier mechanically...
6064170 Method of controlling a printhead movement based on a screw pitch to minimize swath-to-swath error in an image processing apparatus  
An image processing apparatus (10), typically for sheet thermal print media. The image processing apparatus (10) typically comprises a vacuum imaging drum (300) for holding thermal print media (32)...
6060857 Stepper motor controller  
A controller 20 for a stepper motor 10 comprises a plurality of outputs 26 for supplying drive signals to coils 16 of the stepper motor 10, pulse generating means for supplying full step signals...
6060849 Current control system for an electric motor  
A current control system for electric motor is disclosed. The system includes a controller, switches, and resistors. The system is located between the power source and the motor. These resistors...
6057663 Current control in driving DC-brushless motor with independent windings  
The control of the current in a PWM mode through independently controlled windings of a multi-phase motor driven in a "bipolar" mode is implemented by employing only two sense resistors and related...
6057978 Disk driving device selectively using delayed step pulses  
A disk driving device is provided with a stepping motor arranged to move a head in units of a predetermined step with respect to a disk-shaped recording medium and a driving pulse generating...
6054834 Control system for a step motor and method thereof  
A control system of a step motor and a method thereof are capable of evenly maintaining a traveling distance and a torque in a moving section, especially in an accelerating section, by limiting a...
6054835 Stepping motor control, and operating mode of such motors  
A method and apparatus for operating stepping motors in a printer or copier senses temporarily changes in the moment of resistance caused by the introduction of the leading edge of the paper and...
6051949 Apparatus for driving stepping motor of camera  
A stepping motor driving apparatus for a camera includes 1-2 phase excitation type stepping motors and a drive controller for driving and stopping the stepping motors so that the driven stepping...
6051950 Positional determination device using a stepping motor  
A positional determination device which is drived according to the pulse signals output to a stepping motor 1 and displaces a nut 2 to a position corresponding to the degree of rotation. In order...
6049184 Method and arrangement for controlling a current  
To control the current through a winding interconnected in an H-bridge to control e.g. a stepping motor, at the beginning of each chopper period, the H-bridge is kept in its slow demagnetization...
6046567 Stepper motor drive system  
A device for driving a stepper motor in variable sized micro-steps in response to slew rate commands. The device integrates the slew rate commands, calculates the currents to be supplied to the...
6040677 Apparatus for driving stepper motor of camera  
A stepping motor driving apparatus for a camera having a 1-2 phase excitation type stepping motor which is driven by a 1-2 phase excitation in response to a drive signal includes a drive control...
6040676 Passive electronic damping for step motor  
Passive electronic damping apparatus for a step motor of the type having a number of phase windings, comprising: a respective transconductance amplifier coupled to each phase winding for producing...
6037735 Slow-speed servomechanism  
A slow-speed servomechanism includes a motor for driving a load; a direct drive transmission between the motor and the load; an incremental optical encoder connected to the load, the encoder having...
6034500 Stepping motor control apparatus  
A stepping motor control apparatus for controlling a stepping motor to drive a fluid flow control valve in an engine includes an operation state monitoring unit for monitoring the operation state...
6034501 Device for driving stepper motor type measuring instrument  
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...
6028412 Digital frequency generator  
Generating a clock signal having a desired frequency is accomplished by generating a pulse each time a stored accumulator value is found to be greater than or equal to a stored trigger value The...
RE36568 Current decay control in switched reluctance motor  
A control circuit (10) for controlling the residual or tail current decay in a single phase or polyphase SM winding when a phase is switched from active to inactive. A Hall-effect type sensor (30)...
6020705 Process and equipment for positioning a step motor for a disk playback, recording and/or extracting machine  
A playback, recording and/or extracting machine for disks designed as information carriers has opposite disk magazines that receive disk-holders or at least one disk in horizontally superimposed...
6013999 Stepper motor control that adjusts to motor loading  
A system and method are provided for controlling a stepper motor having a rotor and a multi-phase stator. Sinusoidal command signals define a commanded position of the motor's rotor. An actual...
6013998 Method for compensating for positional error inherent to stepper motors running in microstepping mode  
A stepper motor that turns a lead screw runs in microstepping mode. To compensate for positional error in microstepping, the method utilizes the characteristic sinusoidal positional error behavior...
6014000 System with motor control using multiple timing signal generators  
A system with motor control uses multiple timing signal generators to control a stepper motor. Control is based on a first timing signal generator when changing the motor's angular velocity....
5998952 Method and apparatus for reducing torque ripple in an electric motor using anticasual filtering  
Current control values are established for an electric motor including providing a table of motor current control values as a function of motor operating angle, providing a torque request signal...
5998955 Pulse-motor driving apparatus  
For efficient pulse motor drive over a wide speed range, two drive-current control methods are switched in accordance with the speed of the pulse motor. As the first method, a PWM control method...
5994812 D.C. motor phase windings and their commutation  
Five phase windings (P1-P5) of a motor 30 are disposed on a common stator 32. An rotor 34 contains three magnetic pole pairs (M1N, M1S, M2N, M2S, M3N, M3S). Each phase winding is energized for 72°...
5990651 Stepping motor drive apparatus and stepping motor  
A stepping motor has Hall elements which detect the position of the rotor and which output detection signals that have the same period as the excitation period, and which leads the position of the...
5982134 Method and apparatus for driving a stepping motor  
When a stepping motor is driven by supplying to the drive coil of the stepping motor a drive current whose amplitude is periodically increased and attenuated with time in a state that the upper...
5963004 Stepper motor controller used in a document reading device  
A stepper motor controller that controls acceleration of a stepper motor so that, once the stepper motor is stabilized at 500 pps, acceleration of the motor is increased to 667 pps for four steps,...
5963006 Apparatus for controlling stepping motor  
An apparatus for controlling a stepping motor used in feeding a sheet, for example, in a facsimile device, includes a driving unit for driving a stepping motor, and an controller for controlling...
5959426 Circuit configuration for affecting the step frequency in the winding-current activation of stepping motor drives with chopped power output stages  
Bipolarity current-activated windings of powerful stepping motors for high step frequencies are to be indexed such that for each load condition the optimum motor torque is attained. The circuit...
5952856 Inductive load driving method and H-bridge circuit control device  
A current detecting resistor is inserted in an H-bridge circuit constructed to cause the flow of a current to an inductive load in both forward and reverse directions by four semiconductor...
5945800 Apparatus and method for controlling a stepping motor  
Method for controlling the rotating speed of an electromechanical device is disclosed herein, the aforementioned method including the following steps. The first step is to map a plurality sets of...
5942872 Method of controlling a stepping motor  
A method and a device for controlling a stepping motor in which the width of step and the direction of rotation of the stepping motor are determined in a controller and sent to a control...
5936371 Method and apparatus for controlling a servo motor using a stepper motor controller integrated circuit  
An improved DC servo motor driver circuit is provided that is based upon a readily available conventional stepper motor driver integrated circuit (IC). The IC's current "Sense" line that is usually...
5932987 Variable step rate precision pumping apparatus  
A method and apparatus for controlling a low volume, low rate precision dispensing pump for photochemicals and the like comprises generating constant current signals having magnitudes related by...
5925965 Axial flux reluctance machine with two stators driving a rotor  
An axial flux reluctance machine including a rotor formed from a wound tape of paramagnetic material, a first stator formed from a wound tape of paramagnetic material and a similarly constructed...
5915861 Method and apparatus for driving a stepping motor using digital pulse trains simulating sine and cosine waves  
The method for driving a stepping motor for printers comprises the generation of first pulses (16A,16B) at n levels recorded in registers and representing a simulation of sinusoidal waves. The...
Matches 251 - 300 out of 1359 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >