Abstract
The permanent magnet synchronous motor (PMSM) has very attractive properties such as: high dynamics, small size, high efficiency, low maintenance, small size and mass to power ratio, which make it suitable for the use in industrial drives. In particular its higher efficiency means that PMSM may be used in applications where the energy savings compensate the higher initial cost. For the best utilization of PMSM properties is very important to use some of modern control techniques. But the techniques require information about rotor position. Rotor position measurement is performed using sensors that are expensive and mainly reduce the reliability of the drive. This fact is the reason for interest in sensorless control techniques. In the article, emphasis is placed on sensorless control of PMSM using voltage signal injection, which requires magnetic saliency of the machine. Magnetic saliency and machine suitability for sensorless control using injection methods can be determined in advance using a measurement method whose mathematical analysis is presented in the article. The measurement method was simulated using software product Matlab-Simulink and experimentally verified on a laboratory stand with the AC drive. DOI: http://dx.doi.org/10.5755/j01.eee.20.2.4784
Highlights
In the last few years, much attention has been paid to the control of the position or speed of AC drives without a speed sensor
Magnetic saliency is caused by two dominant effects: (a) construction of the machine causing different inductance in the longitudinal and transverse axes, which is specific to Interior PMSM (IPMSM), and (b) saturation of the stator by the magnetic flux from the permanent magnets, which is common for all types of permanent magnet synchronous motor (PMSM)
Scientific works deal with the techniques for various types of PMSM, as well as for synchronous reluctance machines (SynRM) or asynchronous machines (AM)
Summary
In the last few years, much attention has been paid to the control of the position or speed of AC drives without a speed sensor This trend is connected with the development of the microprocessor technology, especially with the progress of modern digital signal processors (DSP). If the control algorithm is able to perform the control task without the rotor position sensor and only from the measured current and voltage values, it is so-called sensorless control This method of machine control has several essential advantages: (a) reduction of the total cost of the drive (this applies especially to smaller drives), (b) easier installation of the drive (thanks to the reduction of the number of cables), (c) reduction of the drive volume, (d) increase of the drive reliability. The injection methods utilize the inherent magnetic saliency of the machine [1], [2]
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