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In modern drive systems, electrically excited machines (ESM) have become an interesting alternative to those excited by permanent magnets. The excitation winding is normally supplied by a slip ring system that (in automotive applications) has to be protected against environmental influences like wetness, oil and dust. To increase the power density of ESM, brushless excitation systems based on rotationally...
This paper reports on inverter nonlinearity effects on sensorless control methods based on high-frequency signal injection (HF-injection). Inverter output voltage distortions and their influence on position detection are described analytically and their compensation is discussed. Furthermore it is pointed out that the effects of inverter nonlinearities on sensorless control depend on whether the rotating...
This paper reports on possibilities of simulating electromagnetic micro linear motors to achieve the maximum magnetic and physical performance. Using a finite element method, the force of the motor is calculated and using these characteristic curves, the physical behaviour is simulated. At the end, a comparison with measurements is presented
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