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6327225 |
Electronic unit, and control method for electronic unit
In an electronic unit having a plurality of motors, a reduction in power-supply voltage is suppressed even if the plurality of motors are driven, and a difference in hand moving timing is allowed...
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6327424 |
Method of and circuit for operating a motor using power transistors
The pulse duration of voltage pulses for the control of a motor winding through power transistors is effected by writing data from a microprocessor or CPU to a module having intermediate register...
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6323617 |
Stepping motor drive control circuit
A stepping motor preferably applied to an image reading motor for a facsimile device or the like, drives the rotation with low noise by repeating turning-on and turning-off switching of the driving...
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6320347 |
Method of driving directly a rotary drum in a reproducing machine by a prime mover
A rotor composite type three-phase stepping motor having a stator consisting of two stator elements each having 6 n pieces of stator magnetic pole with Ns pieces of pole tooth formed on the tip end...
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6307345 |
Resonant circuit control system for stepper motors
A stepper motor control system is disclosed. The stepper motor including a rotor positioned within a stator for relative motion. The stepper motor further includes a control system associated with...
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6302090 |
Valve device and valve control method
When a valve lift control signal is received from a control unit 10, two coils from amongst the coils 18a-18d in a step motor 18 are excited and an aperture of a valve 14 is regulated. When the...
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6285154 |
Lens controlling apparatus
A lens controlling apparatus includes a lens-driving stepping motor, a driving current forming circuit for forming a driving current waveform to be supplied to the stepping motor, an inputting...
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6285156 |
Sensorless step recognition process for stepping motors
A process is disclosed for recognizing the step of stepping motors by analyzing the current that flows through the motor, without using any sensors. In order to overcome the problems caused by the...
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6274996 |
Drive control method for stepping motor
A drive control apparatus for a stepping motor comprises a driving circuit connected to the stepping motor for driving the same, and a controller for outputting a control signal to the driving...
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6271641 |
Step motor driving device
A step-motor-driving device includes (a) a step-motor having driving-windings in plurality of phases, (b) an exciter for supplying power to excite driving-windings, (c) a position detector for...
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6262554 |
Electronic device and method of controlling the same
In an electronic device having a stepping motor which can be driven more quickly than in a normal driving operation without causing a significant increase in power consumption, a detecting coil...
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6259221 |
Method and apparatus for tuning motion control system parameters
A method and apparatus for tuning control loop parameters in a motion control system, is provided. In one embodiment, tuning of the proportional and integral gains of a servocontroller's velocity...
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6259225 |
Stepping motor control unit and method, printer employing the same, and information recording medium
A stepping motor control unit is capable of driving a stepping motor fast through feedback control. Slits bored in a disk fixed to a rotor of a stepping motor are located at positions that precede...
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6252371 |
Driving circuit of stepping motor
A driving circuit of a stepping motor comprises an excitation control circuit connected to windings of a stepping motor, a driver circuit consisting of power switching transistors at a positive...
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6246205 |
Driving apparatus for stepping motor
A driving apparatus of a stepping motor has a simplified circuit structure and a bipolar driving system. The stepping motor has two exciting coils, which are driven by respective bridge circuits....
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6229277 |
Method and apparatus for the damping of motor vibrations
A method and an apparatus for damping the vibrations of an alternating current motor is provided. The motor is supplied from an alternating current source with a supply voltage whose frequency is...
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6225773 |
Stepping motor and having external rotor and electromagnetic-combined-permanent magnet stator
A rotor composite type three-phase stepping motor having a stator consisting of two stator elements each having 6 n pieces of stator magnetic pole with Ns pieces of pole tooth formed on the tip end...
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6208107 |
Use of digital current ramping to reduce audible noise in stepper motor
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...
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6201368 |
Switched reluctance drive with high power factor
A polyphase switched reluctance drive is supplied from a passive power factor correction circuit. The phases of the machine are switched so that there is substantially always one phase drawing...
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6201367 |
Method for restarting a synchronous permanent magnet motor still rotating
A method for restarting a three-phase synchronous permanent magnet motor in which the rotor is still rotating and in which the motor is connected to a drive unit having a DC-stage with voltage...
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6198196 |
Method and device for compensating for magnetic pull in a discoidal machine
An electrical machine with a discoidal structure comprising rotor and stator discs disposed coaxially and having at least two axial air gaps between the rotor and stator discs. The widths of the...
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6194863 |
Method and apparatus for driving a stepping motor
A method and an apparatus for driving a stepping motor is provided. Digital desired current values are stored in the form of a sine table and are read from the sine table at a constant sampling...
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6194865 |
Control method and system for electric rotary machine
An apparatus for steadily and efficiently controlling a synchronous motor is equipped with a function for generating dq-axis current commands so that the terminal voltage of the synchronous motor...
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6184646 |
Stepping motor control unit and image forming apparatus
A stepping motor control unit for controlling a stepping motor is provided with a time measuring section for measuring time outputting a time completion pulse when a predetermined time elapses, a...
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6181235 |
Rotary apparatus
A rotary apparatus in which at least one electrically controlled device is attached to a rotor. The rotor carries coils such that rotation of the rotor generates power for the device. A switch is...
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6172942 |
Analog electronic watch
An output of an oscillating circuit is inputted to a system clock generating circuit, and a CPU performing various arithmetic processes is operated by this system clock. In order to operate a...
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6167873 |
Apparatus for controlling EGR valve of diesel engine and method
A disclosed apparatus and method controls an EGR valve including a valve body, a valve seat, and a step motor that fully closes the EGR passage by moving the valve body to abut onto the valve seat...
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6163123 |
Method for controlling electric actuator and apparatus for the same
Rotary motion of a motor of an electric actuator is converted into rectilinear motion with a small sliding resistance by the aid of a ball screw and a feed nut. On the other hand, a control...
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6163126 |
Electronic device
In an electronic apparatus such as a timing device capable of a quick-moving operation, a detecting coil wound coaxially with a driving coil for driving a rotor is arranged, a feedback-induced...
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6160630 |
Image reading apparatus
An image reading apparatus for reading out images on an image carrying paper sheet is provided. The apparatus includes a motor for feeding the image carrying paper sheet. The motor is driven by a...
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6160330 |
Three-phase stepping motor and driving method therefor
A three-phase stepping motor comprising: a rotation shaft rotatably supported by a pair of bearings provided in predetermined places of a housing so as to be in opposition to each other; a...
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6153953 |
Multi-phase PM-type stepping motor
A multi-phase PM-type stepping motor comprising: a rotor constituted by a cylindrical permanent magnet with N poles and S poles magnetized alternately on an outer circumferential surface of the...
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6150789 |
Stepper motor control
In a preferred embodiment, a stepper motor control, including: a driver to drive the stepper rotor; a detector to detect a commanded step rate signal provided to the driver and to provide an output...
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6150782 |
Process for detecting abutment and blocking in an electric motor
In a stop and jamming detection system in an electric motor, in particular a stepping or commutator motor, a parameter is determined by current measurement, from the profile of the instantaneous...
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6150788 |
Load torque detection and drive current optimization determination met
The voltage at a node between a pair of series-connected windings of a synchronous or stepping motor is monitored during operation so as to detect transition voltage regions, the durations of which...
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6144184 |
Motor controlling method and apparatus
In a sheet conveying stepping motor control method and apparatus, a microcomputer controls a stepping motor for intermittently conveying a sheet in different manners for high-speed,...
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6140793 |
Stepper motor controller for microstepping a stepper motor and a method for microstepping a stepper motor
A low overhead controller for microstepping a stepper motor and a low overhead method for microstepping a stepper motor. The reduction in overhead in system processor is accomplished by the control...
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6141110 |
Image forming apparatus and method for controlling multi-phase stepping motor for use in image forming apparatus
In an image forming apparatus and method using a stepping motor for feeding a recording paper, the stepping motor is driven based on a single a line feed control pattern without switching control...
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6137252 |
Controller of a stepping motor, control method for the motor and timing device
A power-saving controller for controlling a stepping motor mounted in an electronic wristwatch. A pulse signal generator in the controller combines two pulse signals GPi and GPi+2 having different...
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6127796 |
Method and device for driving a self-timing stepping motor
For driving a self-timing stepping motor which can be decelerated by an external load, a driving device presets a target step frequency and the motor is started with this target step frequency. The...
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6124651 |
Method for driving stepping motor of multiphase hybrid type
A multi-phase hybrid type stepping motor includes a rotor which is rotatably mounted on a rotary shaft. A rotor magnet is mounted to an axial center of the rotor and two rotor caps are mounted to...
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6124696 |
Programmable stepper motor controller and method therefor
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 comprises a memory sized to store...
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6121745 |
Direct current command generation for a stepper motor drive
A system for controlling a stepper motor is disclosed that includes a microprocessor for directly generating current command signals. The microprocessor has a memory wherein the memory includes a...
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6118246 |
Phase synchronization of redundant motor windings
A method and system (10) for simultaneous operation of primary (14A-14D) and redundant (16A-16D) motor windings in a redundant stepper motor (12). The redundant motor system (10) has a control...
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6119046 |
Method of controlling a chopper driver and a circuit arrangement for executing the method
Depending on the desired direction of current flux through an electrical load such as a stepped motor, in a measuring bridge circuit provided with switchable semiconductors and recovery diodes the...
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6114782 |
Two-phase hybrid step motor driven by three-phase driver
Disclosed is a stator of 2-phase step motor that has 4 stator coils, two in each phase. The coils are wound around 8 stator poles in a standard bifilar winding pattern. The first center-tap of the...
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6114826 |
Stepping motor driving apparatus having small time constant regenerative current path
In an apparatus for driving a stepping motor in a micro step manner by a PWM control signal generated based on a sense voltage, including a sense resistor for generating the sense voltage, a...
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6115149 |
Motor-speed control apparatus for scanners with a movable scan head
A motor-speed control apparatus is provided for use on a scanner of the type having a movable scan head, such as a flatbed scanner, for the purpose of controlling the operation a stepper motor used...
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6111385 |
Driving method using motor and its driving apparatus, exchanging apparatus of recording medium, and driving method of exchanging apparatus of recording medium
A driving apparatus using a motor has a stepping motor, a moving mechanism, and a driving circuit. The moving mechanism moves an object to be driven on the basis of a driving force of the stepping...
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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...
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