Abstract: System comprising an internal combustion engine including a crankshaft, a crankshaft sprocket coupled to the crankshaft, an electric motor in mechanical communication with the crankshaft sprocket, a bidirectional engine position sensor coupled to the crankshaft sprocket, a controller in electrical communication with the bidirectional engine position sensor and a non-transitory memory having instructions that, in response to execution by a processor, cause the processor to determine a position of an engine component upon shutdown of the engine, store the position of the engine component at shutdown in the non-transitory memory, and control the electric motor at restart in response to the position of the engine component at shutdown are disclosed. Methods are also disclosed.

Abstract: A position sensor according to the present invention includes: a magnet configured to move together with a moving body and generate a first magnetic flux along a specific movement direction of the moving body and a second magnetic flux along the opposite direction to the specific movement direction of the moving body; and a sensor configured to detect the direction of the first magnetic flux and the direction of the second magnetic flux. The magnet is configured by at least one magnet having at least two pairs of magnetic poles to be paired formed thereon.

Abstract: Various embodiments of the present technology comprise a method and apparatus for an encoder. In various embodiments, the encoder is configured to perform offset and gain correction. The encoder includes a first correction circuit to perform offset and gain correction and a second correction circuit to perform additional offset and gain correction.

Abstract: A ripple monitoring circuit may generate information indicative of a failing component in a power supply. At least one input may receive a ripple signal from the power supply that has a ripple component. A quantization circuit may repeatedly quantize the amplitude of the ripple component. A ripple amplitude statistics counter bank may count and store the number of times that different quantized amplitudes or different ranges of quantized amplitudes of the ripple component occurred. A ripple monitoring circuit may generate information about a power supply. At least one input may receive a ripple signal from the power supply that has a ripple component. A ripple measurement circuit may measure a characteristic of the ripple component. A storage circuit may store information about the measurement. A comparison circuit may compare information stored in the storage circuit with a threshold value and indicate when the stored information meets or exceeds this threshold value.

Abstract: A motor drive controlling apparatus includes: a controller that generates and outputs a drive control signal, in response to input of a speed command signal and a rotational direction signal; a motor driver that generates and outputs a drive signal to a motor, in response to the drive control signal; and an encoder that detects a rotational position of the motor to output an encoder signal. The controller includes: a measurement unit that detects, based on the encoder signal, a time at which a rotational state of the motor becomes, caused by an external factor, different from that commanded by the speed command and rotational direction signals, and measures a movement amount from the time; and a transmitting unit that transmits, to the motor driver, a signal for stopping an output of the drive signal, when the movement amount and a drive-control-signal outputting state satisfy a predetermined condition.

Abstract: An absolute capacitative encoder includes a PCB, a plurality of conductive sectors that generate capacitors, a rotor mounted in revolving and/or axially translating mode with respect to the PCB, the rotor being made of dielectric material and having a peripheral slot in register with the conductive sectors, a control unit electrically connected to the conductive sectors in such manner to detect the capacity of each capacitor generated by the conductive sectors, the control unit being set in such manner to detect the capacity variation between the capacitors during the rotation and/or axial translation of the rotor in order to detect the angular and/or axial position of the rotor.

Abstract: An electronic device may include a housing including an upper opening part, a flat panel display set arranged in the upper opening part and including a screen, and a circuit board arranged under the flat type display set and coupled to an inner surface of the housing.

Abstract: A robot control device, when starting from a stop state, updates a first rotation angle or a second rotation angle based on at least one of the first rotation angle stored in a first rotation angle storage unit and the second rotation angle stored in a second rotation angle storage unit and at least one of the first rotation angle detected by a first rotation angle detector and the second rotation angle detected by the second rotation angle detector.

Abstract: A machine having a function for adjusting the position of mechanical origin of a moving part (10) that is driven by a servo motor equipped with a position detector, comprising a reference counter (16) for counting the value detected by the position detector, a storage unit (17) for storing the capacity of the reference counter of when the moving part is moved in a predetermined direction and is positioned at the position of mechanical origin, a reference counter reading unit (18) for reading the value of the reference counter of when the moving part is positioned, a counter capacity reading unit (19) for reading the counter capacity of the reference counter, and an adjustment amount calculation unit (20) for calculating the amount of adjusting the position of mechanical origin based on the value of the reference counter and on the capacity of the reference counter.

Abstract: A motor controller receiving as input an encoder signal changing in response to a driving position of a motor, outputting a motor driving command in response to the encoder signal to control at least one of the driving position or a driving velocity of the motor, includes an interrupt processing section to execute interrupt operations every prescribed interrupt cycle, a low-frequency processing section to selectively execute a subset of the interrupt operations every prescribed number of the interrupt cycles, and a high-frequency processing section to execute another subset of the interrupt operations every prescribed interrupt cycle, wherein the high-frequency processing section executes at least an operation to detect the driving position indicated by the encoder signal, wherein the low-frequency processing section executes at least an operation to generate the motor driving command.

Abstract: A signal processor includes an AD converter that converts a periodic analog signal output from a detector in accordance with a position Q of a motor to a digital signal at a predetermined conversion period, a tracking circuit that calculates a position P of the motor at an arithmetic period on the basis of the digital signal that is converted and output at the conversion period by the AD converter, an operation state identifier that identifies an operation state of the motor on the basis of the position P of the motor calculated by the tracking circuit, and an arithmetic period determiner that changes the arithmetic period of the tracking circuit in accordance with the operation state of the motor identified by the operation state identifier such that the position P of the motor calculated by the tracking circuit follows the actual position Q of the motor.

Abstract: A motor control device has a current value sampling unit configured to sample a current value of a motor, a PWM signal generation unit configured to generate a PWM signal to drive the motor, based on the sampled current value of the motor, and a power supply stop unit configured to stop supply of power from a control power supply to a peripheral depending on power stored in a DC link part and power to which the control power source can supply when an alternating-current power source fails.

Abstract: A unit of absolute rotary position encoding, where the angular range of encoding is matched to the number of poles of an electrical motor it is intended that the encoder is to be attached to. The electrical motor is suitably a brushless DC motor. This provides unique rotational position values only through an angle corresponding to an angle between two consecutive poles to enable control/drive electronics to accurately and smoothly turn the rotor from standstill and at low speeds with varying loads applied to the motor.

Abstract: An encoder having a function for detecting noise which may affect an internal signal of the encoder, without using a noise detecting circuit within the encoder, whereby the cost and size thereof may be reduced. The encoder has a detecting part adapted to detect the movement of an electric motor or a driven object; a signal processing circuit adapted to process a detection signal from the detecting part and obtain positional data of the motor or the object; and a transmitting part adapted to transmit the positional data from the signal processing circuit at regular time intervals and a fluctuation component calculated on the basis of the positional data, to external equipment. The signal processing circuit has a fluctuation component detecting circuit adapted to detect a fluctuation comment included in the calculated positional data, and the detected fluctuation component is transmitted to the external controller as an amount of noise.

Abstract: In one implementation, an encoder assembly for a printer includes: an encoder scale having indicators thereon for determining a printing parameter; an encoder sensor for sensing indicators on the scale; and a mechanism configured to alternately attach an encoder part (either the scale or the sensor) to the substrate and detach the encoder part from the substrate. In another implementation, a method includes: attaching an encoder part to a print substrate, the encoder part being either an encoder scale or an encoder sensor; the sensor sensing indicators on the scale while advancing the substrate with the encoder part attached; and detaching the encoder part from the substrate.

Abstract: A servo driver sets an instruction value for an operation of a servo motor based on an instruction signal from a controller. The servo driver sends the instruction value and a feedback value obtained based on a feedback signal to a safety unit. When at least one of the instruction value and the feedback value sent by the servo driver has an abnormal value, an STO signal is generated and sent to the servo driver. When the STO signal is input to the servo driver, the servo driver stops the supply of electricity to the servo motor.

Abstract: In a method for determining a velocity of an object in a printing system, a reference pattern is moved, in particular in a substantial linear movement or in a rotational movement, relative to an fixed reference point independent of the object. A first sensor, configured to have substantially the same velocity as said object with respect to said reference pattern, provides a sensor signal based on the sensed reference pattern. The velocity of the object with respect to said fixed reference point is determined based on the determined velocity of said reference pattern with respect to said fixed reference point, and based on the sensor signal. The movement of the reference pattern enables improved accuracy of the determination of the velocity of the object, in particular for a slow moving object.

Abstract: An optical entire-circumference encoder includes a plurality of rotation slits provided to transmit light at an equal pitch radially around a rotation axis as a center in a rotation track. A plurality of fixed slits is provided to transmit light at an equal pitch in a plurality of regions radially around the rotation axis as the center in a fixed track. A plurality of light receivers is disposed in a vicinity of the rotation axis to receive a light guided by the light guide in the regions respectively. The fixed slits in one of the regions and the fixed slits in another region adjacent to the one of the regions among the regions in the fixed track are formed so that a phase difference by which a rotation direction of the rotor is determined occurs between light reception signals of the plurality of light receivers.

Abstract: A rotation direction control method of a cooling fan is disclosed. The rotation direction control method includes a detection step, a determination step and a driving step. The detection step receives a temperature control signal from a temperature detection unit by a rotation direction control unit when a predetermined dust-expelling time period begins. The determination step determines whether a detected temperature is higher than a predetermined value based on the temperature control signal by the rotation direction control unit. The driving step controls the rotation direction control unit to keep outputting a cooling signal so as to drive a motor of the cooling fan for a cooling operation when the determination of the determination step is positive.

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 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: First to fourth magnetic detection units (22-25) are arranged in opposition to a multipole magnetized surface (21a) of a multipole magnet (21) of a magnetic encoder (17). The first and second magnetic detection units (22, 23) are placed on positions separated from each other by 180 degrees on the periphery of the center of the multipole magnet and output an A-phase signal and a B-phase signal. The third and fourth magnetic detection units (24, 25) are placed on positions separated from each other by nearly 180 degrees on the periphery of the center of the multipole magnet and output an A-phase reverse signal and a B-phase reverse signal. Detection signals of the same phase are synthesized and averaged, and consequently a detection error generated by an outer magnetic flux extending in the diameter direction of the multipole magnet can be removed.

Abstract: A control system of a three phase induction motor driver and a field weakening control method. The control system includes a driver control module, a field weakening control module, an AC power source, a power loop module, a current sensing module, and an AC motor module. A switching period of an inverter PWM control is used for the AC motor and an inverter control thereof to analyze and obtain the difference value of the sum of effective switching times. The field weakening control module generates an adaptive magnetizing current command in real time to achieve a maximum utilization of a DC link voltage so as to let the AC motor module achieve maximum output torque under different field weakening regions of different speeds when a rated speed is exceeded.

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 position detection system includes a linear motor having a rod in which magnetic poles of N pole and S pole are arranged alternately in an axial direction and a plurality of coils surrounding the rod a magnetic sensor for detecting change in the direction of the magnetic field of the rod caused by linear movement of the rod relative to the coils to output a sine wave signal and a cosine wave signal which are 90° phase shifted with respect to one another, and a position detecting circuit for detecting a position of the rod relative to the coils. As the magnetic sensor detects the change in the direction of the magnetic field of the rod, the sine wave signal and the cosine wave signal output from the magnetic sensor hardly vary even when the distance between the rod and the magnetic sensor is changed.

Abstract: An encoder includes: a main scale having two or more band-shaped tracks in each of which an optical main grating is formed so that longitudinal direction of the main scale corresponds to a measurement axis direction; and an index scale opposed to the main scale so as to form a diffraction interference optical system in cooperation with the main grating, disposed so as to be movable relative to the main scale in the measurement axis direction, and in which two or more optical index gratings are formed. A plurality of slits included in the main grating in at least one track are formed so as to be inclined at a predetermined inclination angle from a direction perpendicular to the measurement axis direction so that pitch of the slits in the track becomes equal to the pitch of the slits in the at least one other track.

Abstract: Embodiments of a switched reluctance (SR) motor for use in a integrated vacuum system for a vehicle are disclosed. The SR motor may receive input voltage directly from an electrical storage device used to start up an engine of the vehicle. The SR motor may include an encoder that triggers an optical sensor to provide signals to a motor controller. The motor controller may energize stator poles based on the received signals. The encoder may be mechanically phase-advanced with respect to poles of the rotor to ensure proper start-up of the SR motor. Commutations of the motor may occur before a point of maximum inductance where the rotor and stator are aligned. In a preferred embodiment, the input voltage received by the SR motor is in a range of 9-16 Volts DC, a maximum drawn current is 36 amps, and the phase advance is between 9-11 degrees.

Abstract: A motor rotational position detecting method detects the magnetic pole position of each phase of a three-phase AC servomotor, generates a three-phase square wave signal having a phase difference of 120 degrees, allocates data on the rotational position of a motor shaft to the edge of each square wave signal, calculates the rotational speed of the motor on the basis of the elapsed time from the previous edge detection point to this time edge detection point, and estimates the rotational position of the motor shaft at a certain period and outputs it on the basis of the rotational speed of the motor and the rotational position allocated to this time edge in the rotational section from this time edge detection point to the next edge detection point. As a result, a detection mechanism can be constructed with a small installation space and at low cost and the output of a high-resolution encoder can be obtained in a pseudo manner.

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 method for controlling starting of a motor is described, which is mainly applicable to estimate a possible initial position of a rotor of a motor by detecting a rotor rotation signal of the motor, and find out a most possible initial position of the rotor after making statistics. In the method for controlling the starting of the motor, a starting angle position region of the motor is calculated simply by using the rotor rotation signal of the motor, without additionally arranging a Hall sensor, so as to save a cost of a Hall device and an assembling cost. Furthermore, accuracy for estimating the starting position region can be increased according to an accuracy specification of products, thereby achieving a high flexibility.

Abstract: A method and a system for video camera assembly are provided. The video camera assembly includes at least one of a pan mechanism rotatable about a pan axis and a tilt mechanism rotatable about a tilt axis. The pan mechanism includes a pan motor and a pan position encoder. The tilt mechanism includes a tilt motor and a tilt position encoder. A controller is communicatively coupled to at least one of the pan mechanism and the tilt mechanism and is configured to apply a filter to a power drive signal of at least one of the pan motor and the tilt motor based on a determined corresponding rotational speed of the at least one of the pan motor and the tilt motor with the effect of reducing steady state vibrations which degrade the visual and audible qualities of said video camera assembly.

Abstract: A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to output a low-resolution encoded signal; an insertion calculation unit capable of receiving the low-resolution encoded signal from the encoder to be processed by an interpolation operation for converting the low-resolution encoded signal into a high-resolution encoded signal to be outputted therefrom; a servo control chip capable of setting internal parameters and receiving the high-resolution encoded signal from the insertion calculation unit to be processed by a calculation process so as to output a switch control instruction; and a power module capable of receiving the switch control instruction from the servo control chip and then transmitting the same to the servo motor for adjusting the operation speed of the servo motor.

Abstract: A device comprising a fan controller, an encoder, a driver, a resistor/capacitor filter, and a baseboard management controller. The fan controller is configured to output a cooling fan status signal, and to output a cooling fan information data signal. The encoder is configured to encode the cooling fan status signal and the cooling fan information data signal together into a combined signal. The driver is configured to invert the combined signal and to output an inverted signal. The resistor/capacitor filter is configured to filter out the cooling fan information data signal from the inverted signal, and to output a filtered signal. The baseboard management controller is configured to determine a status of a cooling fan in response to the filtered signal, and to output a control signal to the fan controller module for the cooling fan based on the cooling fan information data signal within the inverted signal.

Abstract: The invention provides, as an aspect thereof, an document reading apparatus that includes: a speed calculating unit that calculates a speed related to the rotation of a motor on the basis of a signal that is outputted from an encoder; and a controlling unit that calculates control amount on the basis of the speed calculated by the speed calculating unit so as to control the rotation of the motor in accordance with the calculated control amount. In the configuration of an document reading apparatus according to this aspect of the invention, the above-mentioned controlling unit controls the motor with an increase in the control amount in a case where there occurs no change in the signal that is outputted from the encoder for a certain period of time. The increase in the control amount is based on the length of time that has elapsed since the last change in the signal.

Abstract: A method of determining the eccentricity of an encoder scale member of a rotary encoder includes taking an encoder scale blank having a geometric center and mounting the encoder scale blank centered about a second center. A scale can then be produced on the encoder scale blank thereby forming an encoder scale member. The scale of the encoder scale member is centered about the second center. Any eccentricity between the geometric center and the second center is measured by, for example, measuring any change in the apparent radius of the encoder scale member. The encoder scale member may then be mounted in a working location wherein it is rotated about a third axis. The eccentricity when mounted in the working location may be matched to that measured during manufacture thereof and/or the eccentricity errors arising from both manufacture and mounting of the encoder scale member may be determined.

Abstract: The present invention provides a method and system that improve the low-speed control stability of a video camera assembly, including a video camera, a tilt motor operable to tilt the video camera and a pan motor operable to pan the video camera. A first encoder is coupled to one of the tilt motor and pan motor. The first encoder outputs a plurality of signals having corresponding signal edges, based on a rotation speed of the one of the tilt motor and pan motor. A first controller is in electrical communication with the first encoder. The first controller determines a speed of the one of the tilt motor and pan motor at least in part by correlating a time period between detection of the first edge and detection of the second edge to the speed of the at least one tilt motor and pan motor.

Abstract: An ultra-precision machine tool capable of accurately detecting a machining start position, in which movable axes are supported by fluid bearings. A workpiece is mounted on a rotary table of a B axis, and the rotary table is mounted on an X axis that is a linear motion axis. A tool is mounted on a Y axis. The Y axis is mounted on a Z axis. The X axis is moved reciprocally each time the Z axis is moved a predetermined amount, a machining surface of the workpiece is scanned, and it is determined whether or not position deviation of the X, Y and B axes reaches or exceeds a reference value. The Y axis is driven and the tool is moved toward the workpiece a predetermined amount, and the above-described scan is performed.

Abstract: A driving velocity of a motor is detected by processing a position information signal output from a sensor in accordance with a driving position of a motor. The signal processing device includes a position information signal processor (410) that processes the position information signal and calculates driving velocity information of the motor, and an internal position information generator (460) that reflects a latest driving velocity information (?n) calculated by the position information signal processor (410) and generates a latest presumed position of the motor as internal position information. An amplitude correcting unit (465) detects the amplitude of the position information signal from the sensor and corrects the amplitude of the internal position information signal based on the detected amplitude.

Abstract: An apparatus and method of controlling injection in an electric injection molding machine including a motor and a screw. The apparatus has an encoder detecting a current position of the screw and outputting the detected position as an encoding signal, a memory storing reference positions of the screw according to a drive of the motor by the passage of time, and a current controller checking an elapse of time that the screw moves from a previous position to a current position through receiving the encoding signal from the encoder, reading out a section of time corresponding to the checked elapse of time from the memory, and controlling a current value applied to the motor based on a difference between a reference position of the screw corresponding to the read-out section of time and a current position of the screw.

Abstract: The control apparatus 10 of a servo motor of the present invention has a position control unit 11 controlling the position of a servo motor 33, a speed control unit 12 controlling a speed of the servo motor 33, a distributing unit 13 dividing the speed command output by the position control unit 11 into a filtered part Vf which is filtered to suppress vibration and a nonfiltered part Vnf, a filtering unit 14 receiving as input the filtered part Vf and filtering and outputting the filtered part Vf, and an adder unit 15 adding the filtered part Vf filtered by the filtering unit 14 and the nonfiltered part Vnf and outputting the result to the speed control unit 12.

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: Correction of rotary encoder eccentricity in an image forming device having a motor controller using period and position pulse train feedback signals. A motor includes an encoder disc rotating with the motor and at least two encoder sensors disposed at different circumferential positions about the encoder disc. A controller may use a high speed clock to calculate a corrected speed count based on speed counts determined from the number of clock cycles that elapse per cycle of pulse trains from the encoders. The controller may also calculate a corrected position count based at least partly on one or more position counts determined from the number of clock cycles that elapse between periodic sampling points and transitions of encoder pulse trains. The corrected position count may also be calculated based on a position count and one or more speed counts.

Abstract: Provided is a magnetic encoder device capable of detecting a rotating angle of an actuator having a cavity structure. The magnetic encoder device includes a ring-shaped rotating body 11, a ring-shaped permanent magnet 12 which is inscribed in and fixed to an inner circumferential side of the ring-shaped rotating body 11 and magnetized in a direction perpendicular to a center axis of the rotating body 11, and a fixed body 13 which is disposed on an inner circumferential side of the permanent magnet 12 through an air gap and has a circular circumference and a cavity, and a magnetic field detecting element 14 disposed on an outer circumferential side of the fixed body 13 through the permanent magnet 12 and the air gap.

Abstract: An operator system for moving a barrier between limit positions, includes an operator motor assembly mounted to the barrier, wherein the motor assembly is movable between an operating position and a locking position with the motor assembly blocking movement of the barrier. A bias assembly allows the motor assembly to move toward the locking position when either a predetermined force overcomes a biasing force, or when the barrier is moved to a closed position or when forced entry is imposed on the barrier. A modified blocker tab having a plurality of projections, and which is part of the motor assembly, allows the speed/angular position of the rotation of the motor assembly to be monitored with increased resolution.

Abstract: A motor position signal processing apparatus electrically connected to a signal processor and an optical encoder of a motor control system includes a first switch, a second switch, a first signal integration amplifier, a first separator, a second signal integration amplifier, a second separator, a third signal integration amplifier, a third separator, a fourth separator and an inverter. An enable signal outputted by the signal processor is processed by the inverter to switch the operation to the first switch or the second switch. An incremental signal outputted by the optical encoder, a motor mechanical position and a reset correction signal are processed by the first, second and third signal integration amplifiers and transmitted to the signal processor for controlling the operation of a motor.

Abstract: A motor absolute position signal processing apparatus connected to a signal processor and an optical encoder of a motor control system includes first and second switches, a signal integration amplifier, first and second separators and an inverter. The first switch is connected with the optical encoder, the second switch with the optical encoder and the first switch, the signal integration amplifier with the first and second switches, the first separator with the signal integration amplifier and the signal processor, and the second separator with the signal processor. An input end of the inverter is connected with the second separator and an output end with the second switch. The signal processor outputs an enable signal to be processed by the inverter for switching the first or second switch. The signal integration amplifier processes and transmits two sets of differential signals SIN;/SIN and COS;/COS of the optical encoder to the signal processor.

Abstract: An integrated motor and position sensor achieves motion between a moving portion and a stationary portion by electrically energizing poles to interact with magnetics respectively on the moving and stationary portions. The position sensor includes a plurality of sensing coils placed to intercept the magnetic flux between a plurality of the poles and the magnetics. The outputs from these coils are fed to a microprocessor or DSP through an internal or external A/D converter. The microprocessor or DSP decodes the measured voltages using resolver strategies to produce a position, velocity or acceleration measurement.

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: The present invention relates to a safety system for use in protection functions, which system prevents that an error in one control circuit do not result in a function failure by using supervising functions comprising at least two sensors connected to a monitoring unit which receives and processes information about a position of a machine from both sensors and compares the results with stored values and a number of input conditions for the monitoring unit, whereby said sensors comprise means for generating data with respect to a position of a machine movement and said monitoring unit comprises means, which with respect to the result of the comparison is arranged to stop a machine movement if conditions for a stop are fulfilled. The monitoring unit is arranged to compare values from said sensors and when detecting deviating value from either one of sensors detecting a functional error with the sensors.