Abstract
This paper exhibits a novel technique to obtain an encoderless speed control of a permanent magnet synchronous motor (PMSM) in the case of a loss of one phase. The importance of this work is that it presents solutions in order to maintain the operation of the system in various conditions. This will increase the reliability of the whole drive system to meet the safety issues required in some applications. To achieve that, a fault-tolerant inverter modulated through a 3-dimension space vector pulse width modulation technique (3D-SVPWM) is used. Besides that, an algorithm to obtain the exact position of the saturation saliency in the case of a loss of one phase is introduced to achieve a closed-loop field-oriented encoderless speed control and to further enhance the reliability of the whole drive system. This algorithm is based on measuring the transient stator current responses of the motor due to the insulated-gate bipolar transistors (IGBTs) switching actions. Then according to the operating condition (normal or a loss of one phase), the saliency position signals are constructed from the dynamic current responses. Simulation results are provided to demonstrate the effectiveness of the saliency tracking technique under normal and under a loss of one phase conditions. Moreover, the results verify the maximum reliability for the whole drive system that is achieved in this work through a continuous operation of the drive system under a loss of one phase condition and under encoderless speed control.
Highlights
Nowadays, permanent magnet synchronous motors (PMSMs) are increasingly being used in industrial and domestic drive applications
The simulation of the PMSM drive system has been carried out using the SABER simulation package in sensored mode pre and post open-circuit fault
This paper has presented an encoderless speed control of a PMSM synchronous motor based on a
Summary
Permanent magnet synchronous motors (PMSMs) are increasingly being used in industrial and domestic drive applications. By applying a kind of excitation signal (currents or voltages) and measuring the stator current’s effect due to the injected signals, the saliency position and rotor position can be obtained These techniques give a good performance at zero and low speed under different load conditions. In certain applications like electric vehicles, aerospace systems, military, and hospitals, the shutdown of the electrical systems due to any fault in the inverter may result in a potential risk to human beings and immeasurable economic losses [13,14,15] These applications require a reliable inverter that enables the continuous operation of the system in the case of a loss of one phase. In addition to using a new algorithm to track the saturation saliency in the PMSM under a single-phase open-circuit fault, this issue is quite important in some applications like vehicle and aerospace applications to increase the safety procedures and reliability for the whole system
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