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Application of reaching law approach to the position control of a vector controlled induction motor drive

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Abstract

In this paper, a new position control method based on the reaching law control (RLC) approach is proposed for the robust position control of electrical drive systems. The main aim of this study is to investigate the robustness of the RLC approach under inertial-frictional variations and external disturbances and to address the application problems of the RLC approach for position control systems. New components are added to the controller in order to improve the robustness. The control method is applied to a vector-controlled induction motor drive system. It is shown in the paper that the practical constraints such as torque limitation, and the demand of high control performance, i.e., high bandwidth, result in undesirable overshoots. The performance of the control method is shown by simulation and experimental results.

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Abbreviations

X, X k :

Continuous and discrete-time state vectors

x 1, x 2 :

State variables (the shaft position and speed of the rotor)

θ,θ re :

Position and reference angles (rad)

ω :

Angular velocity (rad/s)

A,A n :

State variable matrix with true and nominal parameters

B,B n :

Control input matrix, with true and nominal parameters

u,u max :

Control signal, and its maximum value

Δ A,ΔB :

Uncertain parts of the state matrix and the control input matrix

\( \Delta {\mathbf{ \ifmmode\expandafter\tilde\else\expandafter\~\fi{A}}},\;\Delta {\mathbf{ \ifmmode\expandafter\tilde\else\expandafter\~\fi{B}}} \) :

Equivalent terms of Δ A, ΔB uncertainties referred to matching condition

C :

Gain vector of switching function

s k :

Switching function

q :

A constant used in the reaching law

ε :

A constant used in the reaching law

δ :

A constant used in the chattering reduction approach

T :

sampling period

J,J n :

True and nominal inertia coefficient (kg m2)

B,B n :

True and nominal friction coefficient (kg m2/s)

ΔJB :

The uncertain parts of the inertia and friction coefficients

T e :

Produced (electrical) torque (control signal) (Nm)

\( T_{{\text{L}}} , \ifmmode\expandafter\tilde\else\expandafter\~\fi{T}_{{\text{L}}} \) :

Load torque (Nm)

\( {\mathbf{ \ifmmode\expandafter\tilde\else\expandafter\~\fi{D}}},\; \ifmmode\expandafter\tilde\else\expandafter\~\fi{D} \) :

Equivalent term of ΔA referred to matching condition and scalar component

\( \ifmmode\expandafter\tilde\else\expandafter\~\fi{E}\) :

Equivalent term of ΔB referred to matching condition

\( \ifmmode\expandafter\tilde\else\expandafter\~\fi{L}\) :

All uncertainties and disturbances referred to matching condition

ΔJ 0B 0 :

The variation ratios of the inertia and friction coefficients

G :

State variable matrix in discrete-time model

H :

Control input matrix in discrete-time model

λ:

Slope of the sliding line (surface)

a :

Mechanical time constant

v sd, v sq :

Stator voltages in d-q axis (V)

i sd, i sq :

Stator currents in d-q axis (A)

L s, L R :

Stator and rotor self inductances (H)

L m :

Mutual inductance (H)

σ :

Leakage factor

ω e, ω sl :

Stator and slip angular velocity (rad/s)

τ r :

Rotor time constant

P :

Number of poles

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Correspondence to Z. H. Akpolat.

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Bayindir, M.I., Can, H., Akpolat, Z.H. et al. Application of reaching law approach to the position control of a vector controlled induction motor drive. Electr Eng 87, 207–215 (2005). https://doi.org/10.1007/s00202-004-0235-5

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  • DOI: https://doi.org/10.1007/s00202-004-0235-5

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