Parameters estimation of non-saturated permanent magnet synchronous machines by aid of statistical analysis
Mazen M. A. Al Ibraheemi a*, Fatih J. Anayi b, Zainb H. Radhy c and Mahdi W. Neamah c
aDepartment of Electronics and Communication, College of Engineering, University of Al Qadisiyah, Iraq
bWolfson Centre for Magnetics, Cardiff University, Cardiff CF24 3AA, U.K
cDepartment of Statistics, College of Administration and Economics, Karbala University, Karbala, Iraq
A R T I C L E I N F O
Article history:
Received 25 December 2022
Received in revised form 25 February 2023
Accepted 20 June 2023
Keywords:
Synchronous Machines
Rotor Position
Signals
Sensorless Technique
Voltage
A B S T R A C T
The rotor position value is the most important parameter in synchronous machines. In this paper, a MATLAB model of high-resolution rotor position determination at zero speed, without any position sensor, is presented for a non-saturated permanent magnet motor. The motor current and voltage responses for two short pulses were employed to form address lines for memory cells whose contents represent the exact rotor position. The proposed model presents rotor position at 1o resolution and works with salient rotor poles. It could be modified to obtain the results for non-salient poles. The model needs only two current sensors and does not require any special technique for magnet polarity detection. This method was tested successfully for a two-poles machine, and it could be applicable to any number of poles. The statistical analysis, regarding the uniform distribution of the rotor position angles, supported the validity of the proposed method.
© 2023 University of Al-Qadisiyah. All rights reserved.
- Introduction
Permanent magnet synchronous machines (PMSMs) have a leading position nowadays in various fields of modern life due to their significant features. Compared to the relative machines, the PMSMs have a higher (power/size) ratio, greater reliability, lower power consumption, and faster speed. These features are the essential properties that make the PMSMs desirable in a wide range of industrial applications over other machines, starting from home appliances to complicated industrial processes [1]–[3]..
The process of commutation is the fundamental factor in the best running of PMSMs. This process is strongly related to the prior knowledge of the position of the north pole of the rotor permanent magnet. So, accurate rotor position estimation is regarded as the crucial element to maintaining the
optimum action of this type of machine. Based on this, various methods have been proposed to control this process on this type of motor at different speeds, from standstill to high speed. Among these methods, the proper start-up technique of PMSMs preserves reasonable posterior operation and avoids reverse running or stiffness of the rotor. Therefore, the prior accurate determination of the rotor position angle ensures a flexible and exact commutation for current excitations of the stator three windings of the undertaken motor. Accordingly, a soft motor running with minimum torque ripple and maximum output power can be taken out [4], [5].
The methods of rotor position valuation are categorized into three classes according to the region of machine speed; the standstill region, low-speed