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Proceedings ArticleDOI

New simultaneous rotor flux and stator current controlled IM drive for good dynamic performance applications

29 Jun 1992-pp 665-671

AbstractA high-performance induction motor (IM) drive which is different from field-oriented control (FOC) is presented. In this drive, the rotor flux and the stator current are simultaneously controlled. The drive has the characteristics of good dynamics and fast transient response. Implementation of this drive is very simple compared with the FOC. Although the drive is robust against the rotor resistance variation, a rotor resistance compensation method for controlling the output torque accurately is presented. Simulation results show that the drive scheme can be used for applications requiring good dynamic performance. >

Topics: Wound rotor motor (66%), Vector control (65%), Rotor (electric) (63%), Squirrel-cage rotor (63%), Induction motor (61%) more

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Journal ArticleDOI
Abstract: Field orientation has emerged as a powerful tool for controlling ac machines such as inverter-supplied induction motors. The dynamic performance of such a drive is comparable to that of a converterfed four quadrant dc drive. The complex functions required by filed-oriented control may be executed by microprocessors on line, thus greatly reducing the necessary control hardware. It is shown that the flux signals may be derived from sensing coils or, with some compromise in performance, from the stator voltages and currents. The speed signal is obtained from a digital tachometer. Results from a 2-kW experimental drive are given.

241 citations

Journal ArticleDOI
Abstract: Vector control schemes are used in inverter-fed induction motor drives to obtain high performance. Crucial to the success of the vector control scheme is the knowledge of the instantaneous position of the rotor flux. The position of the rotor flux is measured in the direct scheme and estimated in the indirect schemes. Since the estimation of the flux position requires a priori knowledge of the induction motor parameters, the indirect schemes are all machine-parameter dependent. Changes in temperature and saturation levels of the machine vary the machine parameters and, hence, indirectly influence both the steady state and the dynamic operation of the drive system. Analytic expressions are derived to evaluate the effects due to parameter sensitivity. The simulation is experimentally verified on a drive system.

210 citations

Journal ArticleDOI
Abstract: A production variable-frequency drive is described which uses an induction motor and a controlled-current inverter. The control loops of the drive have been arranged so that the performance of the drive is extended to zero speed and to the theoretical upper limit speed. Operating modes include torque smoothing by programmed dc link current, pulsewidth modulated (PWM) current shaping, and flux-controlled constant horsepower operation.

43 citations

Journal ArticleDOI
Abstract: This paper describes the simulation of a control scheme using the principle of field orientation for the control of a voltage source inverter-fed induction motor. The control principle is explained, followed by an algorithm to simulate various components of the system in the digital computer. The dynamic response of the system for the load disturbance and set-point variations have been studied. Also, the results of the simulation showing the behavior of field coordinates for such disturbances are given.

24 citations

Journal ArticleDOI
Abstract: An analytical design is presented of the control system of a slip-controlled current inverter induction motor drive. First of all, the drive dynamics are modeled in a control-oriented perspective. Afterwards, the transfer function between the rectifier output voltage and the inverter current is thoroughly analyzed and the results used to design the current controller. Two function generators are then synthetized and incorporated in the speed loop so as to obtain constant rotor flux operation and satisfactory torque dynamics. Lastly, the speed controller is designed for a fast and accurate response. All the parameters of the control system are given in terms of performance specifications and drive data. A computer implementation of the drive system is carried out and performance tests are shown.

23 citations