Abstract
Determination of the seven parameters of a Direct Current (DC) motor and drive is presented, based on the speed and current step responses. The method is extended for the motor and drive parameter determination in the case of a controlled drive. The influence of a speed controller on the responses is considered in the motor model with the use of the measured voltage. Current limitation of the supply unit is also considered in the DC motor model. For parameter determination, a motor model is used, which is determined with two coupled differential equations. Euler’s first-order and Runge–Kutta fourth-order methods are used for the motor model simulations. For parameter determination, evolutionary methods are used and compared to each other. Methods used are Genetic Algorithm, Differential Evolutions with two strategies, Teaching–Learning-Based Optimization, and Artificial Bee Colony. To improve results, deviation of the motor model simulation time is used and Memory Assistance with three different approaches is analyzed to shorten the calculation time. The tests showed that Differential Evolution (DE)/rand/1/exp is the most appropriate for the presented problem. The division of the motor model simulation time improves the results. For the presented problem, short-term memory assistance can be suggested for calculation time reduction.
Highlights
Drives with Direct Current motors (DC motors) are used widely in industrial applications.DC motors are easy to control and model, and they are often used for industry control systems
Calculations of the DCSimulated motor and drive parameters were made for all four simulated input data
Ra : The maximum deviation of calculated Ra was less than 14%, which is a good result
Summary
Drives with Direct Current motors (DC motors) are used widely in industrial applications. DC motors are easy to control and model, and they are often used for industry control systems. The problem is that often, DC motor and a drive parameters are not known. A precise model of the DC motor cannot be made, it may be needed, among other things, for analytical control system design and optimization. Given in the motor specifications provided by the motor manufacturer, could have relatively large tolerances in their electric and mechanical parameters, especially for cheaper DC motors, and often not all parameters are given. Some of them can be measured, but appropriate equipment is needed, and for some measurements the coils should be disconnected, which can be a problem
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