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6670783 |
Method and apparatus for improved motor control through current/velocity correction
The present invention provides a method and apparatus, including a processor and software incorporating a table that contains sets of pre-determined correction values that are used to supply...
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6667595 |
Stall detection in stepper motors
A stall detection method and system for a stepper motor ascertains a stalled condition according to current rise time of the windings. The motor is determined to be in a normal running condition...
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6667594 |
Determination of maximum travel of linear actuator
An apparatus for and method of monitoring the operation of a stepper motor used to control the main burner valve of a gas appliance by positioning a linear actuator. The gas appliance has a pilot...
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6664753 |
Apparatus of controlling to rotate step motor
To prevent erroneous detection when a step motor is not rotated by a simple constitution. A control circuit controls to make a transistor to ON/OFF in a rotation detection period immediately after...
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6664754 |
Motor driving control apparatus
A motor driving control apparatus for driving a motor repeats alternately the supply of current to the motor coil during the exciting period and the non-supply of current to the motor coil during...
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6661193 |
Stepping motor driving apparatus with dynamic torque control
A stepping motor driving apparatus with dynamic torque control includes a motor controller, a motor driver, and a frequency-to-voltage converter. In practice, the clock signals are sent to the...
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6657406 |
Soft start control method for a motor-driven actuator
A method of operation for a motor-driven worm gear actuator coupled to a load device energizes the motor in a series of pulses during an initial period of motor operation when reversal of the motor...
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6642687 |
Stepping-motor driving device and lens driving device using the same
A driving device for a stepping motor capable of providing positioning accuracy with low power consumption includes elements such as a setting circuit for setting the number of driving steps of the...
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6640791 |
EGR valve control apparatus
An EGR valve control apparatus is provided which is capable of controlling an amount of exhaust gas to be recirculated in a precise and proper manner by using a step motor, as well as improving the...
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6628098 |
Method for accelerating a control movement in a positioner system with step motors
A method for the acceleration of the adjusting movement in a positioning system in which at least one stepping motor is controlled at a variable control frequency f, the adjusting speed is...
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6624608 |
Indicating instrument for a vehicle
In an indicating instrument for a vehicle including a step motor and a stopper unit for stopping a pointer at a zero position, a memory for pre-storing a zero-level electric angle as a correction...
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6624607 |
Energy-absorbing filter for a motor
An energy absorbing filter for reducing mechanical oscillations in motor is disclosed. The energy absorbing filter places a virtual shunt across the motor windings so as to dissipate mechanical...
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6611658 |
Disk device and disk decelerating and stopping method for the same
A decelerating method with low power consumption can be selected when rapid deceleration is not required. A disk can be stopped promptly and reliably even when a need arises for stopping the disk...
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6603282 |
DC motor control device and control method
A DC motor control device and a DC motor control method are configured to calculate driving motion time and DC motor current flow per unit time, or DC motor total current flow and driving motion...
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6597147 |
1/8th and 1/16th micro-stepping motor drive software architecture
A method of controlling a microstepping motor is disclosed. Logic circuitry is initialized by a microcontroller. A logic sequence to determine a motor use profile, a system profile, and a program...
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6597077 |
Stator coil T-connection for two-phase step motors
A two-phase step motor with bifilar winding around the stator poles is connected to phases α and β (90° apart) of a two-phase driver in a manner that maximizes torque at medium speed operation...
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6573680 |
Method and circuit for driving stepping motor
A method for driving a stepping motor which performs a micro step driving of the present invention makes a rise through rate variable by matching a step difference related to a change in a value of...
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6563285 |
Stepper motor control system
A method and system for controlling a stepper motor that may be used in a paper feed rolling arrangement of a printer. The method includes storing step mode selection data in combination with time...
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6563282 |
Motor control apparatus
With a memory access control portion without being intermediated by control of a CPU controlling an entire drive control of a motor, velocity data for setting velocity of a motor step by step are...
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6555987 |
Step motor control for accommodating friction load variation
Gradually increasing and decreasing the friction torque feedforward term in time, prior to and immediately following intended motion, respectively, reduces the effects of variations in Coulomb...
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6555985 |
Stepping motor control device
In a stepping motor control method using an encoder, a timer means is provided, and an excessive advance of a phase during low rotation is restricted to attain a high speed without compromising...
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6541882 |
Power generator, timepiece and electronic device having the same, and cogging torque adjustment method for the same
Inner notches ( 225 A, 226 A) for adjusting the cogging torque of a rotor ( 21 ) are formed on a stator ( 22 ) in a small-size power generator ( 20 ). Since the inner notches ( 225 A, 226 A) are...
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6522096 |
Control circuit for a robot power supply
A mechanism controller for controlling power to motors of a mechanism having several motors, such as a robot. Each motor has a resolver for indicating the motor position. A driver unit is...
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6518682 |
System monitor for a linear/rotary actuator
A system for programming and controlling the movement of a probe of a voice coil actuator along a path includes a control module that is mounted on a voice coil actuator. Specifically, the control...
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6515445 |
Digital encoder control method
A digital encoder control method of a digital control apparatus has a driving unit, a frequency signal generating unit for generating a pulse signal of a frequency according to a driving velocity...
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6476579 |
Pulse motor driving device, pulse motor driving method, timepiece device, and timepiece device control method
A pulse motor driving device having a rotation detecting unit adapted to detect whether or not a pulse motor rotates. In this device, a control unit performs an operation of increasing the...
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6476580 |
Electronic apparatus and control method for electronic apparatus
In an electronic apparatus including a generator device for generating power, a storage device for storing the generated electric energy, and a motor driven by the electric energy stored in the...
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6476578 |
Stepping motor driving apparatus and image forming apparatus having such driving apparatus
In an image forming apparatus, change in electrical current value flowing through an exciting coil of a motor is measured for a predetermined time period, and, if a measurement result of the change...
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6473657 |
Adaptive motion controller
An adaptive motion controller for driving a servo motor. The adaptive motion controller has an amplifier including a voltage command which can be set at a voltage at which the amplifier will be...
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6462502 |
Stepper motor controlling apparatus
A stepper motor controlling apparatus having a storing unit storing driving data for generating a stepper motor driving phase signal in each of plural controlling circuits, which share the driving...
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6462503 |
Drive control system for stepping motor
A device is provided for chopping a control signal of an initial excitation phase or a final excitation phase by a predetermined cycle during low speed rotation control of an excitation phase...
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6459229 |
Motor control apparatus
A motor control apparatus for outputting the excitation signal of a stepper motor to drive the stepper motor includes a unit for specifying the driving current of the motor, and a determination...
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6459507 |
Image scanner with a stepping control table
This invention provides a scanner, which is capable of scanning document images based on a stepping control table and a method to generate such a table. This scanner includes a scanning module to...
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6449117 |
Reducing acoustic noise using a current profile during initial stages of a disc drive seek
Apparatus and method for reducing the generation of acoustic noise in a disc drive. A seek is carried out to move a head from an initial track to a destination track on a corresponding disc surface...
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6448724 |
Apparatus and method for commutation noise reduction
A brushless DC motor modifies motor commutation events to reduce noise by providing overlapping activation of the switch being deactivated with the switch being newly activated so that three...
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6441579 |
Current magnitude variation correction for open loop stepper motor driver circuit
An available input of to a motor controller is used to measure the motor power supply voltage. Typically, a scaled down version of the voltage is sensed. The microprocessor is used to calculate the...
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6442437 |
Method for step motor control
When the driver of a step motor is executed in a personal computer, its speed will be varied in response to the speed of the CPU. To provide a constant and stable speed of the step motor, the...
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6429619 |
Generator comprising two pairs of differential outputs
The generator having two pairs of differential PWM outputs ( 11 -12, 21 -22 ), comprises i) a microprocessor ( 1 ) having one normal PWM output, ii) two assemblies ( 10, 20 ), each having two...
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6417635 |
Apparatus and method for electrically disposing of hypodermic needle
An apparatus and method for electrically disposing of a hypodermic needle, which provide electric power to the hypodermic needle to generate heat and eliminate the needle with the heat, comprising:...
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6414461 |
Scanner that controls stepping motor torque
A scanner has a housing, a scanning module for scanning a document, a driving module for driving the scanning module, and a control circuit for controlling the scanner. The driving module comprises...
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6414460 |
Low cost 1/8th, 1/16th micro-stepping motor drive system
The invention is a low-cost stepper motor drive system comprising a microstepping motor and a logic circuit. The logic circuit includes two integrated circuits for controlling one or more phases of...
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6407527 |
Motor drive control apparatus
In a motor drive control apparatus, without using a current control circuit, a gate circuit, and a minus power supply, a short period (a period in which either one of Nch and Pch FETs is turned on...
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6388415 |
System and method for controlling a step motor in a scanner
A method for controlling a step motor of a scanner by using three sets of parameters is provided. The three sets of parameters include a pulse count number PCN, a count base CB, and a motor...
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6384566 |
Motor combination system and method for operating as an induction motor or a stepping motor
A motor combination system with operating method for operating as an induction motor or a stepping motor is disclosed. The disclosed system basically encompasses a switch device, an induction motor...
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6384562 |
Scanner motor acceleration method
A scanner motor acceleration method that uses a software driver and a flexible process method to enable a scanner to perform fast scanning operation without increasing motor cost or complex...
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6373209 |
Stepping motor with an electrical activation circuit and arrangement with a stepping motor
A stepping motor with an electrical activation circuit for electrical control of its exciter windings, is made as a driving motor and also as a braking motor with an adjustable braking action. The...
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6356046 |
Instrument panel having pointer driven by stepping motor
An instrument panel for use in an automobile includes a speedometer, an engine rotational speed meter and other indicators. A pointer of each meter is driven by a stepping motor via a reduction...
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6348774 |
Method for controlling several stepping motor modules with prior loading of ramp data
In a method and device for controlling several stepping motor modules in printing or copying machines, sets of ramp data are centrally calculated in a computer in a calculation phase and are...
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6339306 |
Control device for stepper motor, control method for the same, and timing device
A control device for stepping motor including a driving pulse supplying unit for supplying a plurality of driving pulses to a driving coil for driving a rotor. A rotation detecting pulse supplying...
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6333610 |
Speed control device for an electronically commutated multiphase electric motor
A speed control device, whereby individual motor phases of an electronically commutated multiphase electric motor are supplied via corresponding individual phase shifters from a constant voltage...
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