Abstract
In the field of sensorless control of permanent magnet synchronous motors (PMSMs), different techniques based on machine anisotropies have been studied and implemented successfully. Nevertheless, most proposed approaches extract the rotor position information from the measured machine currents, that, when applied to low-power machines, might require high-bandwidth current sensors. An interesting alternative is given by sensorless techniques that exploit the star-point voltage of PMSMs, such as the direct flux control technique. This work aims at analyzing the conditions of applicability of such technique by considering a more thorough description of the machine inductance matrix. After a comprehensive mathematical description of the technique and characterization of the machine anisotropy information that is extracted from the star-point voltage, simulation as well as experimental results conducted on a test machine are presented and discussed in order to validate the proposed theory.
Highlights
In the last decades, the demand for compact electrical machines and drives able to guarantee high performance has been pushing towards the adoption of brushless synchronous motors (SMs) in several application fields ranging from e-mobility to renewable energy production
Another interesting usage of the zero-sequence voltage for sensorless operation of permanent magnet synchronous machines (PMSMs) is reported, firstly, in [24], where the machine is operated by exciting two machine phases and by measuring the induced voltage caused by magnetic saturation (IVMS) allowing for the estimation of the rotor position
It can be concluded that, the direct flux control (DFC) technique can be considered as an injection technique, the measured quantity, i.e., the zero-sequence voltage, is modulated differently from the electrical rotor position with respect to the stator reference currents that are exploited for the application of high-frequency injection techniques
Summary
The demand for compact electrical machines and drives able to guarantee high performance has been pushing towards the adoption of brushless synchronous motors (SMs) in several application fields ranging from e-mobility to renewable energy production. In order to improve the quality of such measurements, a Fast resettable integrator circuit (FRIC) was presented in [21,22,23] Another interesting usage of the zero-sequence voltage for sensorless operation of PMSMs is reported, firstly, in [24], where the machine is operated by exciting two machine phases and by measuring the induced voltage caused by magnetic saturation (IVMS) allowing for the estimation of the rotor position. This technique presented the limitation of allowing only block-commutation so, in order to overcome this limitation, this technique was further developed and proposed in [25]. In the last part of the paper, the main findings are discussed and possible future works are pointed out
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