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| Number | Title | Issue Date |
| 8179081 | Driver circuit A stepping motor includes two coils and has supply currents to the two coils with different phases so that a rotor is rotated by the two coils. During a period where one coil is in a high impedance state, an induced voltage generated at that coil is detected. An out... | 05/15/2012 |
| 8169171 | Drive apparatus A drive apparatus includes a magnet rotor, a stator having a coil, a position detector configured to detect a position of the magnet rotor, a lead angle circuit configured to output a signal having a lead angle relative to an output of the position detector, a first... | 05/01/2012 |
| 8164295 | Stepping motor controlling device, method, and storage medium A stepping motor controlling device includes first and second clock signal generators, plural drivers, and a controller. The first clock signal generator generates a reference clock signal for rotationally driving of plural stepping motors. The second clock signal g... | 04/24/2012 |
| 8138697 | Sensorless speed detection during zero vector A speed estimation method for determining the speed of a sensorless permanent magnet brushless motor having one or more phases driven by one or more stages of an inverter, each stage including high- and low-switches connected in series across a DC Bus and having a r... | 03/20/2012 |
| 8129934 | Motor driver supplying drive current while adjusting decay rate thereof A motor driver that supplies a drive current to a stepping motor includes a decay rate controller configured to mix a first decay rate and a second decay rate smaller than the first decay rate with each other, and set a plurality of mix decay rates, a control logic ... | 03/06/2012 |
| 8111033 | Stepping motor control circuit and analog electronic timepiece The present invention aims to prevent a nonrotation state from being brought about even when a drive allowance is changed by variations in a stepping motor or the like. A pulse down counter circuit outputs pulse down control signal for subjecting main drive pulse to... | 02/07/2012 |
| 8089239 | Advanced method for stepper motor speed determination A method and apparatus for determining speed of a stepper motor. In one embodiment of the method, a first terminal of a first coil of the stepper motor is coupled to an input of a multibit digital-to-analog (A/D) convertor. The stepper motor's a rotor is rotated abo... | 01/03/2012 |
| 8080968 | Drive control device for a stepper motor and drive control method of the stepper motor A stepper motor control device includes a control device that controls an operation of a stepper motor. The control device implements a target rotational angle change computation process that calculates a target rotational angle change of the stepper motor and a div... | 12/20/2011 |
| 8072178 | Image forming apparatus and method An image forming apparatus including a stepper motor, a component attached to the stepper motor, and a controller to control the stepper motor. The controller controls the stepper motor to be accelerated or decelerated, at driving frequencies that do not match a res... | 12/06/2011 |
| 8067919 | Drive control system of stepping motor and drive control method A drive control device and a drive control method for a stepping motor are provided to reduce the number of parts and generation of vibration and noise by a stepping motor. The drive control device controls a drive frequency of the stepping motor according to a meas... | 11/29/2011 |
| 7986120 | Pulse motor control device, control method, control program, and imaging apparatus A pulse motor control device includes a drive pulse generator configured to generate a drive pulse in accordance with a set cycle, a pulse motor driver configured to generate an excitation current of a pattern corresponding to the number of division per one step of ... | 07/26/2011 |
| 7977909 | Device and method of driving stepping motor of analog electronic clock A stepping motor driving apparatus of an analog electronic clock, in which, when the rotation of a rotor is not detected after a pulse is supplied to a coil of a stepping motor, a first switching control section switches the pulse supplied to the coil to a pulse hav... | 07/12/2011 |
| 7969108 | Control circuit for a brushless DC motor and method therefor A control circuit (120, 140) for a brushless direct current (DC) motor (160) includes a current drive circuit (140), a current loop regulator (122), and a commutation loop regulator (124, 126). The current drive circuit (140... | 06/28/2011 |
| 7898206 | Stepping motor drive A stepping motor drive is provided, by which a recoil movement of a driven member upon an initialization action can be reduced. The stepping motor drive includes: a drive signal supply means which supplies a plurality of periodic drive signals having different phase... | 03/01/2011 |
| 7880423 | Method and apparatus for stepper motor stall detection A detector device and a method for detecting a stall condition in a stepper motor, wherein the characteristics of the back EMF are identified directly from a waveform of the back EMF, specifically a first peak of the back EMF, a valley of the back EMF, and a second ... | 02/01/2011 |
| 7863851 | Closed loop stepper motor control System and method for controlling a stepper motor. A current position of the stepper motor may be received. A position error of the stepper motor may be determined using the current position of the stepper motor. A velocity profile may be maintained based on the pos... | 01/04/2011 |
| 7859216 | Stepper motor apparatus and method for controlling stepper motor The object of the invention is to provide a stepper motor apparatus and a method for controlling a stepper motor, and particularly relates to a stepper motor apparatus for driving a pointer and a method for controlling the stepper motor. When an ignition switch is t... | 12/28/2010 |
| 7816883 | Return-to-zero control method for a stepper motor In a return-to-zero stepping sequence for a stepper motor that drives the pointer of a gauge, steps that could potentially cause the pointer to flutter are modified. At least the initial potential flutter step of the stepping sequence is divided into sub-steps to pr... | 10/19/2010 |
| 7800335 | Method, apparatus, and program for driving a motor in a feedback control system, capable of suppressing motor oscillation A method, apparatus, and program for driving a motor in a feedback control system, capable of suppressing oscillation of the motor are disclosed. A motor drive controller includes a drive motor, a detector, and a motor drive controller. The drive motor drives a movi... | 09/21/2010 |
| 7795835 | Step motor driving apparatus A step motor driving apparatus includes a micro control unit (MCU), a pulse generator, a first step motor driver, a second step motor driver, and a communication port. The first step motor driver is configured for driving a first step motor and connected to the MCU.... | 09/14/2010 |
| 7782006 | Motor controlling device To provide a motor controlling device that reduces heat generated by an armature and switching elements when an alternating motor is activated. A motor controlling device includes: an H bridge circuit 20 that has FET1 to FET4 that connect and di... | 08/24/2010 |
| 7723943 | Receiving method A receiving method is provided comprising the following steps. First, a receiving device is provided, wherein the receiving device comprises a chamber, a plurality of spacers, a spacer moving module, a first cover unit, a second cover unit, a control unit and an inp... | 05/25/2010 |
| 7705555 | Method and controller for detecting a stall condition in a stepping motor during micro-stepping A method is provided for detecting a stall condition in a stepping motor. The stepping motor has two coils and a rotor, and is micro-stepped by substantially continuously driving both of the two coils with out-of-phase time varying voltages. The method includes step... | 04/27/2010 |
| 7701163 | Stepping motor control method A stepping motor control method, comprising the step of magnetising at least one of a number of teeth within the stepping motor to move a rotor of the stepping motor into a position such that it contacts or maintains contact with a mechanical stop, wherein a first t... | 04/20/2010 |
| 7701162 | Method for controlling stepping motor There is provided a method for controlling a stepping motor by employing a micro-step mode at deceleration or acceleration of the stepping motor, which moves an optical pickup head in a full step mode or a half step mode, to minimize lens vibration of the optical pi... | 04/20/2010 |
| 7688020 | Step motor driving circuits A step motor driving circuit is provided. An exemplary step motor driving circuit includes an input voltage source set, a reference voltage source, a voltage level shift unit, a logic unit, a reset voltage source, and an output voltage terminal. The input voltage so... | 03/30/2010 |
| 7671556 | Image sensing apparatus An image sensing apparatus, which has a constant-voltage driven stepping motor, comprises a PWM waveform generation part that generates pulse signals to be applied to switching devices; and a PWM waveform determination section that determines a PWM waveform to be ge... | 03/02/2010 |
| 7656115 | Calibrating stepper motor by driving fractional ranges 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 in a series of ever-shorter tr... | 02/02/2010 |
| 7638959 | Method of operating a brushless motor wherein open loop and closed loop controllers utilize different commutation methods A motor control is provided with both open loop and closed loop controllers. The open loop and closed loop controllers provide commutation signals back to gate drives for an inverter, wherein the commutation signals utilize sinusoidal signals in open loop control, a... | 12/29/2009 |
| 7583045 | Stepping motor control apparatus, stepping motor control method and stepping motor control program product There are included a control circuit to control sequence of excitation of a stepping motor, a switching circuit to switch electric power to be supplied to the stepping motor based on an instruction from the control circuit, and a stop circuit to stop an operation of... | 09/01/2009 |
| 7541768 | Step motor control circuit and method of generating step motor control signal A step motor control circuit that does not fix a reference voltage of a step motor control signal. The step motor control circuit may include a digital-to-analog (DAC) signal generator configured to generate first and second DAC signals in response to a step motor e... | 06/02/2009 |
| 7538513 | Step motor drive circuit and analog electronic timepiece A step motor drive circuit has a first transistor pair having first and transistors, a second transistor pair having third and fourth transistors, and fifth and sixth transistors connected in parallel with the first and third transistors, respectively. A driving cir... | 05/26/2009 |
| 7528567 | Safety interlock system and method for disrupting stepper motor control signals A method and a system are disclosed for preventing stepper motor control signals from being applied to a stepper motor drive circuit in order to stop a stepper motor when an interlock situation is present. A sequence of one or more control signals is generated by a ... | 05/05/2009 |
| 7459875 | Control device for stepping motor A pattern register stores an excitation pattern of stepping motors. A first pattern control unit reads out an excitation pattern for n bits from a predetermined address of a pattern register for supplying the same to an external motor driver. A second pattern contro... | 12/02/2008 |
| 7439701 | Method and device for detecting initial excitation phase of stepping motor A method and device for detecting an initial excitation phase of a stepping motor is provided, by which an initial excitation phase of a rotor corresponding to a position of a stopper can be detected with a unit of a stepping angle of a microstep drive which is smal... | 10/21/2008 |
| 7432680 | Circuit and method for controlling motor A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a step... | 10/07/2008 |
| 7432682 | Stepper motor stop and stalling detection method, and stop-detector-equipped stepper motor A stop-detection method intended for a multi-phase synchronous geared motor that is controlled in a stepping mode, which measures the sum of the currents circulating in each of the N phases of the geared motor. In the method the stop detection threshold is calculate... | 10/07/2008 |
| 7429846 | Stepping motor control apparatus A stepping motor control apparatus that is able to electrically detect the load of the stepping motor and effectively prevent step-outs by means of an inexpensive configuration. The stepping motor control apparatus is equipped with a microcomputer (10) that o... | 09/30/2008 |
| 7427847 | Stepping motor controller, printer, stepping motor control method and stepping motor control program product A stepping motor control method including: supplying hold current for holding a rotor of a stepping motor at a prescribed angle to the stepping motor as required while the stepping motor stops; performing a phase change at a frequency lower than a maximum self-start... | 09/23/2008 |
| 7427848 | Skew correction system and method of controlling a skew correction system A system for correcting skew of a web of material being fed through a machine includes first and second pinch assemblies placed at a distance transversely to a direction of feeding. First and second stepper motors drive the first and second pinch assemblies, respect... | 09/23/2008 |
