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A three-channel bilateral control system which is hybrid of position control and force control in the acceleration dimension based on disturbance observer gets unstable in contact with environments under time delay. In this control system, the sum of master force and slave force is controlled to zero in common modal space to realize the law of action-reaction. This paper proposes a velocity damping...
This paper discusses velocity measurement for motor drives with optical encoders. Although many methods on velocity measurement have been proposed, accurate measurement was not achieved in a high-speed range. This paper therefore proposes synchronous-measurement method (S method) that measures the velocity synchronized with the alteration of pulse numbers in each sampling period. Accurate velocity...
FPGAs are focused on recently as motion control processors. Sampling periods become shorter by using FPGAs, and it is expected that improvement of the performance of the motion control system. However in M method, which is the most generally used velocity estimation method, velocity resolution becomes low due to the short sampling period. This leads to a limitation of the performance, especially in...
This paper describes the proposal of preview controller with time based spline approximation for multi axis manipulator. The command trajectory on the geometrical coordinates is projected into time domain trajectory function. The command of position, velocity and acceleration are calculated by time based spline approximation. Simulation result shows that the tracking error and servo lag has reduced...
This research focuses on improvement of disturbance suppression even under existence of observation noise. Disturbance observer is an effective tool to estimate and compensate disturbance. There is a problem, however, that it cannot accomplish desired disturbance suppression when a large observation noise exists. In this research, a method with which influence of disturbance can be suppressed greatly...
A method of friction compensation based on a twin drive system is discussed in the paper. The twin drive system in composed of two motors connected by a differential mechanism. Then the generated torque of the system is the torque difference between two motors. Also these motors are continuously driven to reduce the influence of static friction in each motor even if the system has a stationary motion...
This paper describes a tracking control for plural hand-eye systems with respect to multiple objects. In case that hand-eye systems attempt to realize tracking control in regard to multiple objects simultaneously, there is a situation that it is desirable hand-eye system changes target object. For example, if a hand-eye system continues to track the same target object, collision with the other hand-eye...
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