A Cooperative High-Speed Positioning Control System for Dual-Axis Permanent-Magnet Linear Motor

The Smart Cross Platform guarantees content compatibility of various smart devices and supports numerous programming languages, which is a solution to increasing development productivity. The SVM (Smart Virtual Machine) is the core virtual machine of the smart cross platform. This paper presents a technology which allows the SVM previously operating on smart devices to operate in the web environment. In the whole design and implementation of the SVM operating in the web based environment, this paper focuses on the interpreter, which is used as a method to execute the contents

Small-signal modeling of the incremental optical encoder for motor control

The small-signal model of the incremental optical encoder introduced in this paper provides an insight on the impact of this sensor in the dynamics of the motion control loop of a motor drive. The model is derived and validated for the most commonly employed speed estimation methods: the pulse count and elapsed time methods. Using the model, the reduction of the phase margin due to the encoder phase lag can be quantified at an early design stage. This model facilitates the design of control techniques to compensate for the phase margin reduction due to the associated feedback delays

Performance limitations in Field-Oriented Control for asynchronous machines with low resolution position sensing

The traditional control architecture adopted for asynchronous motors consists of a cascaded control with an inner current loop, based on field-oriented control and an external velocity loop. In the majority of industrial applications this architecture makes use of velocity and flux observers, both fed by a position measurement that is often characterized by low resolution. This paper investigates the effects of the velocity/flux estimation error on the performance of the current/velocity regulation. A methodology, based on a linearized model of the motion control system, is introduced to quantify the perturbations caused by these estimators. Large discrepancies between the stator currents and their estimates, as well as distortion of the mechanical transfer function are explained in the light of these simplified models. Guidelines to improve the design of the current/velocity regulators are presented too. An experimental case study demonstrates how these tools can be exploited to analyze the motion control system of a commercial washing machine