111results about "Controllers with continuous output signal" patented technology

An operation apparatus is designed for use with a system to deal with operation information of the system. In the operation apparatus, an operation piece is manually operable to move in a linear or circular direction to a position indicative of the operation information. A detection section detects the position of the operation piece and outputs position data corresponding to the detected position. A drive section responds to position data inputted from the system to automatically move the operation piece to a position corresponding to the inputted position data. An acquiring section provisionally acquires a plurality of reference position data which are outputted from the detection section when the operation piece is placed at a plurality of reference positions such that the respective reference position data correspond to the respective reference positions. A correcting section corrects the position data outputted from the detection section according to the provisionally acquired reference position data and outputs the corrected position data to the system.

A method and structure receives a desired rotational speed and/or step frequency for an electric motor. If the desired rotational speed is above a predetermined limit, the method performs closed-loop mode control of coil current of the electric motor by varying the average voltage supplied to the electric stepper motor according to observed feedback current from the current feedback loop connected to the electric stepper motor. To the contrary, if the desired rotational speed is not above the predetermined limit, the method performs open-loop mode control of coil current of the electric stepper motor by setting the average voltage supplied to the electric stepper motor according to values computed from the step frequency, irrespective of the observed feedback current from the current feedback loop.

Disclosed are methods and devices for controlling a process with a control signal. Iterations of a control routine are implemented to generate the control signal, and when an indication of a response to the control signal is unavailable, a feedback contribution to the control signal is maintained over one or more of the iterations of the control routine. The feedback contribution is then modified upon receiving the response indication, in which the feedback contribution is determined in accordance with an elapsed time between the received response indication and a previous communication of the response indication.

A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, α. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K_I, K_p, and K_d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.

A servo controller which drives one movable member 1 by means of a plurality of motors including one main motor 31 and at least one sub motor 41 includes: a main-motor controlling unit 30 for controlling driving of the main motor 31; and at least one sub-motor controlling unit 40 for controlling driving of the at least one sub motor 41. The sub-motor controlling unit 40 includes a sub-motor position controlling unit 44 and a sub-motor velocity controlling unit 45. Both the sub-motor position controlling unit 44 and the sub-motor velocity controlling unit 45 do not have an integral characteristic.

The invention discloses a discrete multi-cycle repeat controller for a periodic servo system. According to a time domain design method, a reference signal with multiple different periods that is symmetrically overlaid is offered, a multi-period feedback link is built, and a discrete multi-cycle repeat controller based on a law of attraction is designed based on multi-period symmetry of an interference signal on time domain. Specific controller parameter organization work is performed according to each amplitude of a multi-period interference/reference signal and indexes of a characterization tracking error convergence process, and calculation methods for a power monotonic reduction region, a power-absolute attraction layer and a steady state error band boundary of the characterization tracking error convergence process are provided. The discrete multi-cycle repeat controller based on time domain design converges rapidly, has high tracing accuracy, reduces used memory, eliminates multi-period interference signals, and effectively suppresses non-period interference signals.

An amount of a motor drive current is controlled to an appropriate value. Two coils are provided, and a rotor is rotated by the coils by setting different phases for the supplied currents to the two coils. During a phase where one of the coils is in a high-impedance state, an induced voltage generated in the coil is detected. According to the state of the induced voltage, an output control circuit controls the amounts of the motor drive currents supplied to the two coils.

A system and method for identifying turn faults in a stator of a motor are provided. The method includes determining a normalized cross-coupled impedance from the symmetrical components of measured voltages and currents of the motor. Additionally, the normalized cross-coupled impedance may be normalized to a negative sequence impedance. The negative sequence impedance may be determined through a regression analysis using parameters of the motor, such as line-to-line voltage, horsepower, and number of poles. A system is provided that includes a device having a memory and processor configured to determine a normalized cross-coupled impedance, compare the normalized cross-coupled impedance to one or more thresholds, and trigger and alarm and/or trip the motor.

A load, including an electric motor and electronic circuit for powering the electric motor, the load being inductively powered.

A motor control device includes: a feedforward computing section for computing a motion reference value and a feedforward driving force based on a motion command; a deviation compensation computing section for outputting a deviation compensation driving force by a control computation for reducing a control deviation; a driving-force command synthesizing section for outputting a driving-force command based on the feedforward driving force and the deviation compensation driving force; a reaction-force compensation computing section for computing a motion correction value based on a predetermined reaction-force reference value and the deviation compensation driving force; and a control-deviation computing section for computing the control deviation based on a deviation between the motion reference value and a motor motion detection value, and the motion correction value.