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In many sensorless field-oriented control schemes for induction motor (IM) drives, flux is estimated by means of measured motor currents and control reference voltages. In most cases, flux estimation is based on the integral of back-electromotive-force (EMF) voltages. Inverter nonlinear errors (dead-time and on-state voltage drops) introduce a distortion in the estimated voltage that reduces the accuracy...
This paper presents the experimental test results of the independent vector control characteristics of two three-phase induction motors (IMs) and two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). To drive two motors (IMs or PMSMs) independently, the system connected one motor to one three-phase voltage source inverter (three-VSI) is generally used and is...
Ultra high speed drive applications like PCB drilling machines require mechanical speeds of 200,000 rpm and more. Usual solutions consist of a frequency inverter with induction motors or synchronous motors - the latter provide better efficiency resulting in less thermal losses. The practical problem, however, is not the efficiency during the drilling operation - it's the time needed for acceleration...
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