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Electrical fundamental frequencies of high-speed drives typically range between 1 and 2 kHz. In order to ensure low-loss operation of the drive, the switching frequency has to be kept as low as possible, resulting in pulse numbers smaller than 15. To avoid subharmonics of the modulated voltages, it is highly recommended to synchronize the PWM with the fundamental voltage. In addition to that, the...
A new field oriented control structure is presented which makes it possible to use synchronous optimal PWM (SOPWM) for high-speed PMSM drives. Due to the simplicity of modulator and control, parametrization is straightforward. The algorithms are implemented on an industrial drive controller. Measurement results show the advantages compared to standard PWM schemes using asynchronous space vector modulation...
Constant velocity high-speed drives which are typically used in pumps, compressors or fans are supposed to be operated with high efficiency whereas dynamic behavior of the controlled drive system is of secondary priority. To ensure low-loss operation, the switching frequency has to be chosen as low as acceptable to guarantee stable operation without thermal overload of the PM-synchronous machine due...
This paper focuses on conditions leading to instability of digitally controlled double three-phase permanent magnet synchronous motors with standard PI controller based voltage source inverters. A first simplified motor model is derived to apprehend the problem. The model is then detailed further to get accurate stability limits. A validation of the analysis is done experimentally on a double star...
Parametric models for Permanent Magnet Synchronous Machines (PMSM) based on the magnetic coenergy function are presented. To characterise the nonlinear dependence on the stator currents, splines as piecewise polynomial functions are used. Also, a model of the utilised inverter considering error voltages due to the IGBT lock-time is shown. Two identification methods are described. Results of an identification...
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