摘要:
A method of learning a feed-forward gain in motor control of a control system in which a load inertia fluctuates drastically. The feed-forward gain K is determined by learning in accordance with the following formula: (dK/dt) = [VER*(dU/dt)]/[1 - VER*(dU/dt)] where K is the feed-forward gain, t is the time, VER is an error value and U is an instruction value. A feed-forward gain L of a position loop is fixed (SP1) and a feed-forward gain M of a speed loop is determined by learning (SP2, SP3). Then, a feed-forward gain L is determined by learning (SP4, SP5). In this manner, an optimum feed-forward gain can be determined even when an inertia value is not known.
摘要:
A power servo system which includes an actuator (12) coupled to a load and receives an input command signal (R) indicative of desired motion at the load. A sample-data control system (20) receives and samples input signals (R, Y) indicative of desired and actual motion at the hydraulic actuator and load, and provides drive signals (U(Z)) to the actuator necessary to obtain desired motion. The sampled-data control system (20) includes digital processing circuitry (22) with series and feedback compensation (32, 281, coordinated with the hydraulic system transfer function,to form a complete closed-loop control system operating in the sampled-data or Z-transform domain. Different equation constants (C,, C 2 ,C 3 and G 1 , G 2 , G 3 ) in the series and feedback compensation circuitry are recalculated periodically. In one embodiment of the invention (Figure 3), such constants are recalculated as a function of system behavior, so that system control automatically varies with operating conditions. In other embodiments of the invention (Figures 4 and 5), system constants are calculated based upon a single operator-variable (or remote system) input (a), which accommodates rapid operator-implemented tracking of system behavior while reducing calculation time.
摘要:
A system and method for canceling disturbance in a MEMS device. The system 200 includes a MEMS device 203 , which may include a substrate 205 and a plurality of individually movable MEMS elements 203 - 1 through 203 -N, and a control assembly 207 . The optical system 200 may be utilized in and/or form a portion of any optical apparatus employing an array of MEMS devices. The control assembly 207 uses feed-forward control signals to cancel disturbance in the MEMS device 203 , and more particularly, to cancel disturbance in the non-switched or static mirrors of the MEMS device 203 caused by switched or moving mirrors.
摘要:
A digital control provides adaptive feedforward torque control for a robot [Figs. 1-3] having a plurality of arm joints. An electric motor (20) drives each of the robot arm joints and a power amplifier [Fig. 1 (22)] supplies drive current to each motor under controlled operation. Each joint motor has feedback control loop means including position (PFB) and velocity control loops (VFB) driving a torque control loop (8) in accordance with position commands (PCOM) to generate motor commands for controlling the associated power amplifier. The motion of said joint motor is sent to generate position and velocity feedback signals respectively for combination with the position and velocity commands to generate an error signal (TQCOM) as a torque command for each of the torque control loops from the corresponding position and velocity control loops. Load force is sensed (19) at the endmost robot joint. A feedback signal [Fig. 1 (21)] representative of the joint motor drive current is combined [Fig. 2 (168)] with the torque command to generate a torque error signal in each torque control loop.
摘要:
A control device for a servo motor comprises feedforward means for correcting a speed reference obtained by a position control device by a correction amount obtained on the basis of an objective position or an objective speed of the servo motor so that a response delay of the position control device for obtaining a reference speed necessary to control a rotation angle position of the servo motor to an objective rotation angle position is compensated for while restricting vibration.
摘要:
A system and method for canceling disturbance in a MEMS device. The system 200 includes a MEMS device 203 , which may include a substrate 205 and a plurality of individually movable MEMS elements 203 - 1 through 203 -N, and a control assembly 207 . The optical system 200 may be utilized in and/or form a portion of any optical apparatus employing an array of MEMS devices. The control assembly 207 uses feed-forward control signals to cancel disturbance in the MEMS device 203 , and more particularly, to cancel disturbance in the non-switched or static mirrors of the MEMS device 203 caused by switched or moving mirrors.