2009 11 35838829

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An adaptive sliding-mode observer is proposed for sensorless speed control of induction motors. Two sliding-mode current observers are used to make flux and speed estimation robust against parameter variations. An adaptive speed estimation is derived from stability theory based on the current and flux observers. Simulation and experimental results verify the approach and demonstrate its practicality.

Bildung

An Adaptive Sliding-Mode Observer for Induction Motor Sensorless Speed Control Dec, 2008 授課老師：王明賢教授學生：楊智淵南台科技大學電機系高等伺服控制報告 IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 41, NO. 4, JULY/AUGUST 2005 Jingchuan Li, Longya Xu , Fellow, IEEE , and Zheng Zhang , Senior Member, IEEE

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Abstract ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

INTRODUCTION ,[object Object],[object Object],[object Object]

SLIDING-MODE CURRENT AND FLUX OBSERVER DESIGN ,[object Object]

[object Object],From the equivalent control concept [8], if the current trajectories reach the sliding manifold, we have By selecting large enough, the sliding mode will occur , and then it follows that

[object Object],From an equivalent control point of view, we have where .

C. Rotor Flux Observer Design ,[object Object],where L is the observer gain matrix to be decided such that the observer is asymptotically stable. From (5) and (8), the error equation for the rotor flux is

III. ADAPTIVE SPEED ESTIMATION ,[object Object],where is the estimated rotor speed

[object Object],Where is a positive constant. We know that V is positive definite. The time derivative of V becomes

[object Object],Letting the second term be equal to the third term in (14), we can find the following adaptive scheme for rotor speed identification: where

[object Object],Where and are the positive gains.

IV. STABLITY ANALYSIS ,[object Object],It is apparent that (17) is negative definite. From Lyapunov stability theory, the flux observer is asymptotically stable, guaranteeing the observed flux to converge to the real rotor flux.

V. SIMULATION RESULTS ,[object Object],[object Object]

A. Simulation Results by MATLAB ,[object Object]

B. HIL Evaluation Results by TI 2812 DSP ,[object Object],[object Object]

Fig. 7shows the motor step response to a speed command at 0.5 pu ( 900 r/min).

Fig. 8 shows the real and estimated rotor flux and the estimated flux angle

Fig. 9 shows the motor response to a trapezoidal speed command

VII. CONCLUSION ,[object Object],[object Object],[object Object]

REFERENCES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Wizards are very useful for creating a good user experience. In all businesses, interactive sessions are most beneficial. To improve the user experience, wizards in Odoo provide an interactive session. For creating wizards, we can use transient models or abstract models. This gives features of a model class except the data storing. Transient and abstract models have permanent database persistence. For them, database tables are made, and the records in such tables are kept until they are specifically erased.

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2009 11 35838829

1. An Adaptive Sliding-Mode Observer for Induction Motor Sensorless Speed Control Dec, 2008 授課老師：王明賢教授學生：楊智淵南台科技大學電機系高等伺服控制報告 IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 41, NO. 4, JULY/AUGUST 2005 Jingchuan Li, Longya Xu , Fellow, IEEE , and Zheng Zhang , Senior Member, IEEE

8. The adaptive sliding-mode observer

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26. Fig. 7shows the motor step response to a speed command at 0.5 pu ( 900 r/min).

27. Fig. 8 shows the real and estimated rotor flux and the estimated flux angle

28. Fig. 9 shows the motor response to a trapezoidal speed command

29. VI. EXPERIMETAL RESULTS

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2009 11 35838829

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