Multirate input based quasi-sliding mode control for permanent magnet synchronous motor

Permanent magnet synchronous motor field oriented control system often uses dual-loop (speed and current) cascade structure, and the dynamics speeds of the two loops mismatch. The motor’s mechanical and electrical subsystems have the typical multirate characteristics. Based on the multirate control theory, this paper proposes multirate input quasi-sliding mode algorithm for the speed control loop. Under the situation of the output data loss, the proposed algorithm builds the extended input vector with the output prediction information. Due to the extended input vector, the proposed algorithm reduces the system steady state chatterring, and then improves the performance of the whole system. Simulation and experimental results demonstrate the effectiveness of the proposed algorithm

Mathematical control of complex systems

Copyright © 2013 ZidongWang et al.This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

Dual-rate modified stochastic gradient identification for permanent magnet synchronous motor

The high-performance application of high-power permanent magnet synchronous motor (PMSM) is increasing. This paper focuses on the parameter estimation of PMSM. A novel estimation algorithm for PMSM’s dual-rate sampled-data system has been developed. A polynomial transformation technique is employed to derive a mathematical model for PMSM’s dual-rate sampled-data system. The proposed modified stochastic gradient algorithm gets more excellent convergence performance for smaller index ε. Simulation and experimental results demonstrate the effectiveness and performance improvement of the proposed algorithm

Intelligent Wireless Surveillance of Multirate Induction Motors

Recent advances in the automation field provide a wide range of scope in control and monitoring of the industrial systems. A very accurate automation system is on high demand in recent times. This paper mainly deals about remote monitoring and control of the induction motor. The main objective is to develop an embedded system to prevent the occurrence of line fault in a three phase system (say induction motor) and to display and control the parameters voltage, speed and temperature of the three phase system using Zig-bee communication technology. An ARM microcontroller is used in this project, which controls the entire operation of the system, which also communicates various parameters from one part of the system to other through Zig-bee technology. To prevent the issues of poor blunder elements and commotion affectability emerging in functional applications, the plan issue is changed into a proportional Linear Matrix Inequality (LMI) structure to understand a vigorous state criticism roughly by quick yield testing .The control objective is encircled with rise time, overshoot and settling time particulars. Subsequent to arriving at the consistent express the controller ought to look after solidness. To fulfill the above prerequisites a quick yield inspecting control calculation is planned with the end goal that the ideal shut circle conduct and shut circle soundness is accomplished. The exhibition of the framework is broke down for controlling the speed through wireless networks

Multirate Control of a DVD Player

In this master theses an existing control system of a DVD player has been modified such that it has become more feasible to implement using limited hardware resources. The discrete controller has already been implemented for evaluation purposes using FPGA technology, and is working well. So far however, low resource consuption has not been a major concern. This is gradually changing though, as more features are being planned for the same hardware, potentially taking up more resources than currently available. The approach taken here is to use high level software tools and a powerful general purpose real-time processor to create a new software implementation of the controller and use it to control the real DVD drive. Using this setup, some interesting design parameters for possible custom hardware implementations has been evaluated under real circumstances. One notable such parameter, which is highly correlated to the size of the resulting FPGA implementation, is the choice of wordlength for the representation of signals, states and coefficients in the controller. To efficiently reduce this parameter, the design of the controller has been altered somewhat to make it less sensitive to the lower numerical accuracies introduced, leading to a multirate controller. To analyse what impact the suggested changes would have on the performance of the control system, extensive tests has been made with different design parameters. This includes experiments with trackjumps, which are highly dependent on the properties of the controller. The tests have indicated what savings that seem possible to achieve under the prevailing conditions. Sammanfattning I detta examensarbete har ett reglersystem för en DVD-spelare modifierats så att det bättre lämpar sig att implementeras med begränsade hårdvaruresurser. Den diskreta regulatorn finns redan implementerad med FPGA-teknik i utvärderingssyfte, och fungerar bra. Hittills har dock inte låg resursförbrukning varit av högsta prioritet. Detta håller på att förändras då fler funktioner, som kan behöva mer resurser än vad som finns tillgängliga i nuläget, planeras för samma hårdvara. Tillvägagångssättet har varit att använda avancerade programvaruverktyg och en kraftfull generell realtidsprocessor för att skapa en ny mjukvaruimplementation av regulatorn och använda denna för att styra den riktiga processen. Med denna uppsättning har sedan vissa intressanta designparametrar för potentiella hårdvaruimplementationer kunnat studeras under verkliga förhållanden. En speciellt intressant sådan parameter, som i hög grad påverkar storleken på den resulterande FPGA-kretsen, är valet av ordlängd för signaler, tillstånd och koefficienter i regulatorn. För att effektivt kunna minska denna parameter har designen av regulatorn behövt ändras något för att göra den mindre känslig mot högre numerisk osäkerhet, vilket lett till en multirateregulator. För att analysera vilka effekter de föreslagna ändringarna skulle ha på regulatorns prestanda, har tester gjorts med olika designparametrar. Även tester av spårhopp har gjorts då dessa är särskilt beroende av regulatorns egenskaper. Dessa tester har gett en fingervisning om hur stora besparingar som verkar möjliga att uppnå under gällande omständigheter

A new alternating predictive observer approach for higher bandwidth control of dual-rate dynamic systems

Dual-rate dynamic systems consisting of a sensor with a relatively slow sampling rate and a controller/actuator with a fast updating rate widely exist in control systems. The control bandwidth of these dual-rate dynamic systems is severely restricted by the slow sampling rate of the sensors, resulting in various issues like sluggish dynamics of the closed-loop systems, poor robustness performance. A novel alternating predictive observer (APO) is proposed to significantly enhance the control bandwidth of a generic dual-rate dynamic systems. Specifically, at each fast controller/actuator updating period, we will first implement the prediction step by using the system model to predict the system output, generating a so-called virtual measurement, when there is no output measurement during the slow sampling period. Subsequently, the observation step is carried out by exploiting this virtual measurement as informative update. An APO-based output feedback controller with a fast updating rate is developed and rigorous stability of the closed-loop system is established. The superiority of the proposed method is demonstrated by applying it to control a permanent magnet synchronous motor system.</p

Increasing eigenstructure assignment design degree of freedom using lifting

This paper presents the exposition of an output-lifting eigenstructure assignment (EA) design framework, wherein the available EA design degrees of freedom (DoF) is significantly increased, and the desired eigenstructure of a single-rate full state feedback solution can be achieved within an output feedback system. A structural mapping is introduced to release the output-lifting causality constraint. Additionally, the available design DoF can be further enlarged via involving the input-lifting into the output-lifting EA framework. The newly induced design DoF can be utilised to calculate a structurally constrained, causal gain matrix which will maintain the same assignment capability. In this paper, the robustification of the output-lifting EA is also proposed, which allows a trade-off between performance and robustness in the presence of structured model uncertainties to be established. A lateral flight control benchmark in the EA literature and a numerical example are used to demonstrate the effectiveness of the design framework