The paper presents methods and techniques for measuring basic electrical and non-electrical quantities occurring in control systems for inverter-fed electric drives. The measurement of rotor shaft position and angular velocity, as well as motor voltage, current, flux, power, and torque, is discussed. Experimental results are included.In the process of designing an inverter drive, the following elements are taken into account: measurement of the motor’s physical quantities, parametric identification of the mathematical model, selection of the control method, and tuning of the controllers. The use of microprocessor-based control systems allows for the implementation of complex control algorithms that utilize real-time information about the signals and parameters of the controlled object. These algorithms usually require the use of complicated measurement methods and techniques or signal reconstruction algorithms. Measurement errors and excessive noise, as well as inadequate static and dynamic characteristics of measurement transducers, distort identification results and reduce control quality indicators, and may also contribute to unstable operation of the control system. Problems (…)
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Source: Logistyka Magazine
Measurement problems in inverter drives – PDF file for download