Study on the Vector Control Method of IM for Variable Speed Drive Based on DSP

Abstract

This paper proposes a fully digital high performance variable speed drive of induction motor implementing based on a single chip DSP motor controller. Some important models and features of the classic FOC are analyzed deeply and the implementing flowchart is given. The proposed speed control algorithm programming in C++ is realized by the TMS320F2812 DSP within 25us offering a fast current response. Experimental results show that very well static-and transientperformance can be obtained by the proposed variable-speed drive with reduced hardware and higher reliability. Index Terms -Induction motor, vector control, DSP. NOMENCLATURE Us, Ur Stator and rotor voltage space phasor im,iS, ir Magnetizing, stator and rotor current space phasor /V[s ' r Stator and rotor flux-linkage space phasor Lm, Ls, Lr Magnetizing, stator and rotor inductance respectively Rs Rr Stator and rotor resistance at)e Ct)r The angular speed of stator flux and rotor te the electromagnetic torque Rotor leakage factor (JLr / Lm,) and total leakage factor (1 -L2 I LL) Rotor time constant (Lr I Rr) and stator transient time constant (uL, I Rs ) Subscripts denoting M-and T-axis of the rotor -flux-oriented reference frame

A unified approach for PI controller design in delta domain for indirect field-oriented control of induction motor drive

“…The scalar control of induction motor that results in a sluggish response of the system has been presented in Lorenz R.D et al (1992). To meet the high standards of performance set by dc drives, variable speed AC drives employing induction motors and the field-oriented control method (P. H. Zhang et al, 2006) have been developed in recent years. Besides the scalar control, an alternative approach in the form of indirect rotor flux orientation control is made where the motor control is done using the concept of synchronously rotating reference frames.…”

Soft Starting of Three-Phase Induction Motor Using DSP Auto Coding and Power System Controllers (Digital Motor Controllers)

“…It is a challenge to implement the space vector control technique of induction motor using the traditional hardware that completely complex therefore, Digital Signal Processor (DSP) was born because of the intense computation for coordinate transformation and flux mode calculations [1]. Thus a few years ago due to the limit of the hardware, the researchers oriented their research to develop advanced control algorithm by using the DSP or the microprocessors [2].…”