Abstract: The present invention provides a motor control device capable of operating a robot properly without stopping a motor that operates the robot even when an instantaneous voltage drop occurs.

Abstract: A motor control device includes a counter that counts pulses output from a one-phase encoder according to rotation of a DC motor, and a controller that recognizes rotation number of the DC motor based on the number of pulses counted by the counter. After the DC motor is braked, the controller starts applying a predetermined voltage to the DC motor at first timing before the DC motor stops, and stops applying the predetermined voltage at second timing after the DC motor stops. The controller subtracts the number of pulses generated after the second timing from a value counted by the counter. The predetermined voltage is lower than a lowest voltage necessary for driving a driven object, and is higher than a lowest voltage necessary for rotating the DC motor against an attracting force between a magnet and a coil in the DC motor.

Abstract: A motor control apparatus includes a motor that rotates a controlled object, an encoder that outputs a pulse signal in synchronization with a rotation of the motor, and a control section that performs a feedback control so as to rotate the motor to the target rotational position. The control section includes a stopping and holding control portion. The stopping and holding control portion performs a stopping and holding process in which the stopping and holding control portion supplies electric current to the motor so as to stop and hold the motor for a current-supply holding time. The stopping and holding control portion sets the current-supply holding time on the basis of a rotation speed of the motor just before the stopping and holding process.

Abstract: A method processes a motor variable of a DC motor of an actuating device for a motor vehicle. The DC motor is supplied by an on-board system DC voltage, in which the armature current and the motor voltage of the DC motor are detected and the actuating position of an actuating element is determined from a time profile of the armature current by counting the current ripple contained therein. During an initial phase, the armature current which rises over time is replicated by a function which is determined from pairs of values for the motor voltage and the armature current which are detected in a time interval. A current value of the armature current expected at a later point in time is extrapolated. In the event of a discrepancy between the armature current detected at this later point in time and the extrapolated armature current, a ripple count is started.

Abstract: A feedback system for controlling a servo motor comprising at least one rotary angle sensor and at least one rotary speed sensor, wherein the rotary angle sensor supplies a measured rotary angle value to a computer, wherein the rotary speed sensor supplies a measured rotary speed value to the computer, the actual rotary speed values are the measured rotary angle values interpolated according to the integrated measured rotary speed values, and wherein at high rotary speeds, the actual rotary speed values are the calibrated measured rotary angle values, differentiated with respect to time, and at low rotary speeds, the actual rotary speed values are the measured rotary speed values.

Abstract: A motor control device includes a counter that counts pulses output from a one-phase encoder according to rotation of a DC motor, and a controller that recognizes rotation number of the DC motor based on the number of pulses counted by the counter. After the DC motor is braked, the controller starts applying a predetermined voltage to the DC motor at first timing before the DC motor stops, and stops applying the predetermined voltage at second timing after the DC motor stops. The controller subtracts the number of pulses generated after the second timing from a value counted by the counter. The predetermined voltage is lower than a lowest voltage necessary for driving a driven object, and is higher than a lowest voltage necessary for rotating the DC motor against an attracting force between a magnet and a coil in the DC motor.

Abstract: An instructed position, which includes an instruction area for receiving a predetermined instruction and is displayable two-dimensionally and three-dimensionally, on a display means where an instruction image is displayed is detected. Upon setting on the display means a control range corresponding to the instruction area displayed on the display means such that the control range is changed between during the two-dimensional display and during the three-dimensional display, information of a tentative instructed position is obtained by receiving an instruction directed to the instruction area during the three-dimensional display. A horizontal shift on the display means of the tentative instructed position during the three-dimensional display relative to a position of the instruction area during the two-dimensional display is calculated.

Abstract: A numerical control device includes a primary distribution pulse calculator that calculates primary distribution pulses obtained by distributing movement amounts in first and second directions included in a movement command of a work or a tool for each of predetermined calculation cycles. A secondary distribution pulse calculator calculates, for each movement direction, secondary distribution pulses obtained by distributing the primary distribution pulses of each calculation cycle calculated by the primary distribution pulse calculator, before and after corresponding calculation cycles within ranges of distribution sections across the corresponding calculation cycles and having an acceleration-deceleration time constant of the corresponding movement direction as a section width, and then accumulating the primary distribution pulses for each calculation cycle.

Abstract: A motor control apparatus includes a resolver and a R/D converter in which an electrical angle of 360° is set smaller than a mechanical angle of 360° and that outputs a two-phase encoder signal corresponding to the electrical angle; a two-phase encoder counter that counts the two-phase encoder signal and outputs a digital value corresponding to the electrical angle; a multiplication factor of angle detecting portion that detects a position of the mechanical angle to which an angle indicated by a signal output from the R/D converter corresponds, based on a change in a count value; and a motor controlling portion that corrects a current command value determined based on a torque command value, according to an output of the multiplication factor of angle detecting portion.

Abstract: The position of a rotor of a motor is determined. The motor includes a stator having a plurality of coils. The rotor includes at least one rotating magnetic field device. When the rotor is moving below a threshold speed, the current in the coils is measured. A pre-programmed data structure is accessed. The data structure stores stator currents associated with predetermined rotor positions. A first absolute position of the rotor is determined from the data structure according to the measured current from each of the coils. When the rotor is moving above the threshold speed, one or more rising or falling edges of magnetic field strength associated with the at least one rotating magnetic field device are sensed. At least one timing aspect of the rising and falling edges of magnetic field strength are compared to determine a second absolute position of the rotor.

Abstract: A motor drive device in which the torque vector of the motor is controlled so that the correlation between the number of pulses of a clock signal and the phase of the torque vector of the motor is held in common for multiple excitation methods. The excitation method having the greatest number of steps is used as a reference, and the torque vector of the motor is maintained in the same phase as before switching when the excitation method is switched. The torque vector is in the closest phase in the rotation direction of the motor when there is no phase that is the same as the phase prior to switching.

Abstract: When a failure of a feedback control operation of an electric motor is sensed, a control unit changes the feedback control operation to an open loop control operation. At the time of executing the open loop control operation, the control unit sequentially changes the exciting phase of the motor without executing feedback of information of the count value of the encoder counter and rotates a rotor of the motor until a count value of an exciting phase change counter reaches an open loop target count value, which corresponds to a target rotational position of the rotor. When the control unit changes the feedback control operation to the open loop control operation, the control unit sets the open loop target count value by correcting a feedback target count value based on an exciting phase deviation correction value for the count value of the encoder counter.

Abstract: A linear drive based on linear motors, for panels, in particular sliding doors, movable along a respective travel path. A linear drive for at least one panel, in particular a sliding door leaf, movable along a travel path, has at least one linear motor for this at least one panel. The linear motor is provided with a stator member and a carriage. Furthermore, the linear drive has a control circuit. The control circuit is adapted to stop the linear motor in the event of failure of power supply to the linear motor, by switching-off the linear motor and operating it as a generator. Thereupon, in terms of its displaceability, this movable panel is enabled by the control circuit. In addition, the linear drive has a switch for switching-off the energy supply to the at least one linear motor.

Abstract: There is provided a motor control system and motor control method which can shorten settling time by restraining vibration and deviation relative to an advancing direction during operation. Moreover, according to the present invention, it is possible to cause a motor to be operated with an ideal track and, since it is possible to always monitor a present position, it is made easy to cause a plurality of axes to be synchronously operated. The motor control system is provided with a unit generating command waveforms from a jerk data which has significant effects on the vibration relative to the advancing direction, and a unit performing a real time real position control of regenerating future command waveforms according to a deviation amount, while always performing jerk-limit, whereby the vibration and the deviation relative to the advancing direction when the motor operates at high speed are restrained.

Abstract: A seat controlling mechanism includes motors for actuating a plurality of seat sections, a position detecting apparatus detecting positions of the seat sections and a controlling apparatus controlling the seat sections to move to a predetermined position, wherein an interfering range, an interference avoidable range in which an interference avoidance control is executed and a normal operation range are set in the controlling apparatus, and when at least one of the seat sections positions in the interference avoidable range, the controlling apparatus prohibits the movement of the at least one of the seat sections toward the interfering range.

Abstract: An electric motor includes at least one first brush and at least one second brush, which are arranged in a stationary fashion and arranged to contact a commutator that rotates with a rotor. The commutator includes at least one cylindrical section with a circumferential surface on which a plurality of segments are arranged with insulating sections interposed between them. In order to detect the rotating speed and position of the rotor, the motor includes brushes with asymmetric circumferential widths or angles or a stator with an uneven magnetization. The motor is arranged to detect only one signal when the rotor rotates for an angle between two adjacent segments.

Abstract: A servo motor control apparatus has a feedback loop. When an oscillation detection signal indicates no detection of oscillation, a parameter operating section gives an updating section an operational instruction to set a control parameter in accordance with a supplied set value. When the oscillation detection signal indicates detection of oscillation, the parameter operating section gives the updating section an operational instruction to set such a control parameter as to narrow a frequency band width of the feedback loop.

Abstract: The effect of chattering on the measurement of the pulse period is reduced. The pulse period representing the rise interval of target pulses appearing in a pulse signal PI is measured. The pulse signal PI is sampled in synchronization with a measurement clock CLK. Measurement of a designated inhibition period is started in synchronization with the fall of the signal PI. Measurement of the current pulse period is completed and measurement of a new pulse period is started if the inhibition period has elapsed at the rise of the signal PI. Counting of the current pulse period is continued if the inhibition period has not elapsed.

Abstract: A meter system includes: an indicator including a pointer, a step motor, a stopper mechanism and a driving controller; and a flasher function unit including a flasher switch, a flasher and a flasher controller. The driving controller has: a stopper position detection operation executing element for executing a pointer moving away operation when a stopper position detection operation executing condition is satisfied and for executing a voltage detection type zero point stopper position detection operation when the executing condition is satisfied, and the flasher switch does not turn on and off, and a zero point return enforcement type zero point stopper position detection operation when the executing condition is satisfied, and the flasher switch turns on and off; a zero point setting element; and an applying element for applying the driving signal having the zero point.

Abstract: An integrated gearbox/encoder and control system that includes: a gearbox with an output shaft connected to a mechanical load; a first sensor detecting the rotary position of the output shaft; a motor; a second sensor detecting the rotary position of the motor; and a system controller controlling motive drive to the motor. The two rotary position sensors permit direct determination of gearbox backlash which can be used in motor control. A drive current sensor similarly permits determination of a vibration signature for comparison with a standard.

Abstract: A method processes a motor variable of a DC motor of an actuating device for a motor vehicle. The DC motor is supplied by an on-board system DC voltage, in which the armature current and the motor voltage of the DC motor are detected and the actuating position of an actuating element is determined from a time profile of the armature current by counting the current ripple contained therein. During an initial phase, the armature current which rises over time is replicated by a function which is determined from pairs of values for the motor voltage and the armature current which are detected in a time interval. A current value of the armature current expected at a later point in time is extrapolated. In the event of a discrepancy between the armature current detected at this later point in time and the extrapolated armature current, a ripple count is started.

Abstract: A control system for a massage device. The massage device has a base, a carriage movably engaged with the base, a plurality of kneading heads mounted on the carriage, and a motor operative to drive the plurality of kneading heads to produce a kneading effect on a body of a user and to drive the carriage up and down relative to the base such that various areas of the body can be massaged.

Abstract: Systems, devices, and methods for controlling a motor are disclosed. A method may include determining a rotational direction of a motor from a pair of quadrature signals sent to a microprocessor. The method further includes adjusting an internal count stored in the microprocessor at each edge of each of the pair of quadrature signals. The method further includes adjusting an external count stored in the microprocessor and transmitting an interrupt to a main controller after the first phase signal and the second phase signal have transitioned through each combinational logic state in one of a forward rotational direction and a reverse rotational direction. The method further includes transmitting a signal comprising the rotational direction of the motor and the external count from the microprocessor to a main controller.

Abstract: An electric motor drive control apparatus includes a detection angle obtaining section that obtains the detection angle of the resolver; a correction information storage section that stores correction information for correcting the detection angle, in association with a modulation ratio that is a ratio of an effective value of a fundamental wave component of the AC voltage to the system voltage; and a detection angle correcting section that obtains the correction information from the correction information storage section, based on the modulation ratio at the time the detection angle obtaining section obtains the detection.

Abstract: A command and control system is provided including a core unit, with a processor and a map display engine. The core unit is configured to exchange information with a multi-domain heterogeneous unmanned vehicle command and control module, a multi-sensor command and control module, and an asset tracking module. The asset tracking module estimates a location of an indeterminate object. A control unit exchanges information with an input device. A detecting unit detects modules that are associated with the core unit. A subscription unit logs parameters associated with the detected modules and determines types of data to send to the detected units based on the parameters. A script unit receives and implements command and control scripts for the detected modules. A display output provides display information of a combined representation of information from the detected modules and map information, including locations of the vehicles and sensors under control and the estimated location of the indeterminate object.

Abstract: A servo motor control apparatus having a feedback loop includes: an oscillation detecting section, which detects oscillation of the feedback loop, to output an oscillation detection signal; a parameter operating section, which gives an operational instruction to set a control parameter in the feedback loop based upon the oscillation detection signal; and an updating section, which is supplied with a set value for setting a control parameter, and sets the control parameter in the feedback loop while making an update thereon in accordance with the operational instruction given by the parameter operating section, wherein when the oscillation detection signal indicates no detection of oscillation, the parameter operating section gives the updating section an operational instruction to set a control parameter in accordance with the supplied set value, and when the oscillation detection signal indicates detection of oscillation, parameter operating section gives the updating section an operational instruction to se

Abstract: A microcomputer which obtains a rotor position signal from a biphase signal delivered by a resolver mounted on an electric motor according to a rotation phase of a rotor relative to a stator, thereby controlling the motor based on the rotor position signal. The microcomputer includes a digital signal converter which is configured by hardware and converts the biphase signal delivered from the resolver into a digital data position signal, the digital signal converter being mounted on a single chip.

Abstract: The rotation period of a motor is subdivided by edge interval times and a rate of change between a currently calculated edge interval time and an edge interval time calculated one rotation of the motor previously is calculated at the detection of each edge. Then the rotation period of the motor is calculated by multiplying a set reference period by the calculated rate of change.

Abstract: In a motor speed controller, feedback control is implemented at a gain independent of the target rotational speed ?T while the increase in the circuit size or processing load is reduced. The rotational speed ? of the motor is controlled on the basis of a pulse signal in which a pulse period ?P varies in inverse proportion to ?. A count clock generation circuit varies the clock frequency FC in proportion to ?T. The pulse period measurement section counts the count clock CLK during ?P at the present ? and determines a measured count value C. The feedback filter inputs, as an error signal Ve, the difference between C and a target count value CN that corresponds to ?T, and generates an instruction signal to provide compensation for Ve. The feedback filter scales the instruction signal at a scaling factor that is proportional to ?T.

Abstract: A method of detecting an angular position of a rotor of a motor includes detecting switching ripple peaks and armature current disturbance peaks using a peak detector configured to generate a square wave having edges coinciding with detected peaks. The method further includes filtering the square wave in a time domain by generating an integration ramp, toward a set value, of an estimated ripple frequency for an interval of time based on the estimated ripple frequency. An enablement range is established to reset the integration ramp by setting a threshold below and above the set value and a time window centered on an end time of each period of the estimated ripple frequency. The method further includes resetting the integration ramp, and updating the estimated ripple frequency based upon a period determined by a time of the resetting, if an edge of the square wave is within the time window.

Abstract: A workpiece measuring apparatus includes a programmable controller which acquires positional data of a measuring head. At the same time that the programmable controller acquires the positional data, a pulse output unit outputs timing pulses. The measuring head measures a workpiece on a machine tool according to a measurement command which is output positively earlier than the timing of predetermined time intervals by a time difference which is preset by a predictive system. As a result, a first time at which the programmable controller acquires the positional data of the measuring head and a second time at which the measuring head measures the workpiece in response to the measurement command synchronize. The workpiece measuring apparatus is capable of measuring the workpiece highly accurately in a three-dimensional space according to a minimum required amount of measured data without the need for modifying an existing NC apparatus combined with the machine tool.

Abstract: A linear actuator includes a spindle nut, where the spindle nut and the spindle between a first and a second point, indicating the length of stroke, can move axially in proportion to each other, depending on whether the spindle or the spindle nut is being driven around via the transmission, and where the position is determined with incremental position sensors, such as at least two Hall sensors or Reed-switches. For determining the position an initiating procedure, where the nut/spindle is moved from a first point on the spindle/nut to a second point on the spindle nut is carried out, and that the number of pulses from the incremental position sensors appearing by it are registered as a measurement for the length of stroke, and the position is subsequently determined in relation to that. It is noted that the control is active before, during and after the operation of the motor.

Abstract: Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In some implementations, first and second signals indicative of BEMF of different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.

Abstract: Various systems and methods for controlling DC motors are disclosed herein. For example, one method provides for controlling a polyphase, brushless DC motor. The method includes providing a DC motor that has a plurality of phases. Such a DC motor operates by inducing a current in the plurality of phases in accordance with a plurality of commutation states. In the example, six commutation states are discussed, but fewer than or more than six commutation states may exist. The method further includes initializing a count, inducing a current in the plurality of phases in accordance with a first commutation state, and incrementing the count until the current achieves a threshold in the first commutation state. Then, a current is induced in the plurality of phases in accordance with a second commutation state, and the count is decremented until the current achieves the threshold in the second commutation state.

Abstract: The present invention advantageously provides methods for manually and/or remotely controlling a motorized roller shade that includes a shade attached to a shade tube, a DC gear motor disposed within the shade tube and a microcontroller. One method includes detecting a manual movement of the shade using a sensor, determining a displacement associated with the manual movement, and, if the displacement is less than a maximum displacement, moving the shade to a different position by energizing the DC gear motor to rotate the shade tube. Another method includes receiving a command from a remote control, and moving the shade to a position associated with the command by energizing the DC gear motor to rotate the shade tube.

Abstract: A fault-tolerant position feedback filter may be used in an actuation control system to limit the authority of a first position signal, should the first position signal become erroneous, and thereby prevent a postulated runaway condition of an acuator. The filter includes a difference function, a limited integrator, and a summer. The difference function supplies a first position error signal representative of a mathematical difference between a first position signal and a combined position signal. The limited integrator supplies an integrated position error signal that is limited in magnitude to a predetermined limit. The summer supplies the combined position error signal that is representative of a mathematical sum of the integrated position error signal and the second position signal.

Abstract: A starting circuit for a single-phase AC motor, comprising a main winding, a detecting circuit, a rectifying and filtering circuit, a triggering circuit, a switching circuit and a starting winding. The detecting circuit is connected in series to the main winding for transforming current parameters thereof into detecting signals. The switching circuit is connected in series to the starting winding. The rectifying and filtering circuit processes the detecting signals and the processed detecting signals to the triggering circuit. The triggering circuit enables or disables the switching circuit according to the detecting signals, so as to energize or deenergize the starting winding. The starting circuit features high reliability, long lifetime, simple circuit structure, low cost, and small size.

Abstract: Methods and systems for detecting an angular position of an electric motor are disclosed, including sending an electrical pulse through a stator coil of the electric motor, determining an approximate angular position of a rotor of the electric motor in response to detecting an timing of a returning electrical pulse from the stator coil, the timing of the returning electrical pulse being indicative of the angular position of the rotor; and determining an accurate position of the rotor in response to sensing a transition of a digital sensor in response to the rotor rotating relative to the stator, the transition being indicative of the accurate position.

Abstract: A control system and method of massage machine for acting massage therapy on human body includes a common drive motor for driving multiple massage heads, multiple routine keys for setting motor routines and the rotation direction of the drive motor via a multiple sets of motor switches, a timer, and a Single Chip Microcomputer controller for controlling. In operation, a user could not only set operation mode or routine via the routine keys and then activate massage procedure, but also could change the operation mode or routine of the massage machine by reselecting the routine keys at any time.

Abstract: A fan driver circuit for powering a fan with a linear voltage may be designed using digital design techniques, resulting in a testable, accurate circuit on a smaller die size. The fan driver circuit may be configured to receive a digital control signal, which may be a sequence of numeric values, e.g. multiple-bit binary numbers, each indicative of a desired present rotational speed of the fan. The fan driver circuit may be implemented using a digital modulator, e.g. a delta-sigma modulator, with a simple low-pass filter, e.g. an RC-filter at the output, and may use oversampling based on a system clock, to shift in-band noise to out-of-band frequencies, and digital interpolation to filter out unwanted images from the upsampled digital control signal. The delta-sigma modulator may be constructed as a first-order delta-sigma modulator using an error-feedback structure to reduce die size.

Abstract: A motor control method includes the steps of: measuring a time period from an output of a drive detection signal to a next output of a drive detection signal; storing the measurement result at each time of output of a drive detection signal as a measured cycle; calculating a driven velocity of the driven object based on the stored measured cycle; calculating an operation amount of the motor such that the calculated driven velocity is equal to a predetermined target velocity. In the motor control method, it is determined, at each calculation timing, whether or not the driven object is in a low velocity state where an actual velocity is lower than the target velocity. When determined affirmative, calculation of the driven velocity of the driven object is performed based on a measured value being currently measured at the calculation timing in place of the stored measured cycle.

Abstract: In a correction method for a microprocessor-controlled digital regulation of a drive motor, wherein the measurement arrangement used for the regulation of the motor is simplified. recognizing that the real value surveying cannot always be implemented periodically by the microprocessor at the requested point in time, making sporadic measurement errors of a simplified measurement arrangement ineffectual, in accordance with the method individual measurement values with a sudden change are read out and correction values are used instead of these for the regulation.

Abstract: If a supply voltage for a motor drops below a predetermined level during movement of a windowpane, a controller of a power window system outputs a stop signal instructing the motor to stop rotating, and stores in a memory a first position and a motion direction of the windowpane derived from a first signal generated by a transducer (signal generator). The controller compares a second position of the windowpane derived from a second signal generated by the transducer when the supply voltage for the motor is restored to the predetermined level or higher with the first position of the windowpane stored in the memory. If the second position is different from the first position, the first position stored in the memory is corrected toward the motion direction by an amount corresponding to a difference between the first and second positions.

Abstract: A control apparatus for an adjusting device in a motor vehicle is provided. The apparatus has a sensor, particularly a current sensor (S1), for generating a signal (U1 to U10, I1 to I3, ?t1 to ?t8) which is dependent on a motor movement by a motor in the adjusting device. The apparatus also has a power driver for controlling a motor current, and a processor (RE). The processor is designed and set up (i) to find a position (xm) from the sensor signal (U1 to U10, I1 to I3, ?t1 to ?t8), particularly from the ripple in the motor current, (ii) to associate a reference characteristic (Chref) of orderly signals (U1 to U10, I1 to I3, ?t1 to ?t8) from the sensor, particularly for the ripple, with a reference position (xref), (iii) to correct the position found (xm) on the basis of the reference characteristic (Chref) and the reference position (xref), and (iv) to control the motor current on the basis of the corrected position.

Abstract: The invention includes a system and method for generating simulated encoder outputs in a control system. An output pulse width between reference position inputs is computed, the output pulse width being based upon a difference between an updated reference position input and a previous reference position input, and upon a time interval between the reference position inputs. Next, a plurality of simulated encoder pulses is output between updates of the reference position input based upon the computed output pulse width. The output pulse is thereafter adjusted in a closed loop manner between updates of the reference position input.

Abstract: A motor controller employs absolute encoder signals to periodically assess the existence of cumulative error in a position signal derived from an incremental encoder signal. In one embodiment the absolute encoder signals are extracted from commutation switches of the motor eliminating the need for a separate absolute encoder.

Abstract: A motor control system uses an incremental encoder that provides a signal indicative of motor position. If an illegal state change is detected in the same sampling interval, an error event is recorded and an error counter is incremented. When the number of counts exceeds a pre-determined threshold, the motor is disabled so that appropriate corrective action can be taken.

Abstract: Disclosed is a control apparatus for a brushless DC motor, which has a rotor with n poles (where n is a natural number) that rotates due to a supply current with m phases (where m is a natural number) applied to a stator, controlling the number of output rotations of a gearbox, which is connected to the brushless DC motor and has a predetermined gear reduction ratio-wherein the gear reduction ratio represents a ratio of the number of rotations of the brushless DC motor to the number of output rotations of the gearbox-, the control apparatus comprising: a rotation detector part, which counts the number of rotation pulses generated by the rotation of the rotor from the brushless DC motor; a required rotational amount input part, which receives the number of output rotations as input and converts it to a corresponding required number of rotation pulses; a comparison part, which compares the number of output rotations and the required number of rotation pulses; and a current controller part, which controls a supp

Abstract: An optical apparatus ensuring smooth driving control of an optical member is disclosed. The optical apparatus includes an optical member, a stepping motor configured to drive the optical member, a driving commander configured to generate driving pulses supplied to the stepping motor, a pulse count generator configured to count the driving pulses output from the driving commander, a position detector configured to detect a position of the optical member, and a pulse count presetter configured to replace, based on an output of the pulse count presetter and an output of the position detector, a pulse count output from the pulse count presetter with a pulse count corresponding to the output of the position detector.

Abstract: A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry. The system and method provide for improved motor current waveform sensing that is able to effectively reject false brake pulses, avoid erroneous processing due to fluctuating battery voltage levels, and reduce the sensitivity to variations in motor current signals due to dynamic motor load, manufacturing variation, system aging, temperature, brush bounce, EMI, and other factors. The system and method also include an improved ability to multiplex additional external motor drivers to the motor control circuitry, select between sequential and simultaneous drive modes using an SPI bit, and monitor the system controller for an error condition and simultaneously driver motors in response to the error condition.