Online adaptive decision fusion based torque ripple reduction in permanent magnet synchronous motor

Abstract

In this paper, new methods for reducing the torque ripple in permanent magnet synchronous motor are proposed. The methods are based on injection of appropriate current harmonics to motor by using adaptive decision fusion algorithms. Three different methods are used in determining injection of current harmonics based on q-axis current, q-axis voltage and reference value of the q-axis current. In these methods, the decision values are linearly c o m b i n e dw i t hw e i g h t s ,w h i c ha r eu p d a t e do n l i n ea c c o r d i n gt oa na c t i v ef u s i o nm e t h o d ,b a s e do np e r f o r m i n g orthogonal projections onto convex sets describing these values. The validity of the proposed methods is tested with experimental studies under different operating conditions.

Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose

“…Herewith, we provide a smooth electromagnetic torque [30][31][32]. Therefore, the cogging torque is reduced using the multiobjective parameters given in (7). For instance, in order to reduce cogging torque, rotor magnets are skewed by one slot, the magnet thickness h m is set as 5 mm and slot opening b so is set as 2.2 mm.…”

“…In order to improve the reliability and efficiency of wind turbines, direct drive permanent magnet synchronous generators took the place of doubly-fed induction generators (DFIGs) which have been commonly used until now because of the fact that DFIGs brought some disadvantages related to wind turbine structures [2,4,5]. In [6], a comprehensive comparison has been presented where PMSGs have become more advantageous than induction generators in wind energy conversion applications due to features such as high power factor, high efficiency and low installation and maintenance costs [7].…”

Decreasing Harmonics via Three Phase Parallel Active Power Filter Using Online Adaptive Harmonic Injection Algorithm

“…Hysteresis Band Current Controller (HBCC) is proven that it is an effective method for generating gate signals in all applications of active power filters with voltage source inverters. In addition, this is a consistent and fast method with a high accuracy rate [13]. It is a control method in which reference compensation current and actual compensation current are combined on a hysteresis band to generate switching signals.…”

“…This method was previously applied successfully on a controller board. It was shown that, the method may be used as a computationally efficient torque ripple reduction mechanism in permanent magnet synchronous motor [13]. Different control methods are used to generate the switching signals according to the acquired reference current.…”

Active torque ripple reduction based on an analytical model of torque

“…In the closed-loop feedback controller, the reference torque and instantaneous torque ripple are used as the inputs of torque controller to obtain the appropriate harmonic currents. The instantaneous torque ripple is measured by torque transducer [18], estimated from speed variation [19][20][21] or calculated based on mathematical torque model [18]. To improve the bandwidth of the feedback control system, some adaptive control methods such as iterative learning control and adaptive decision fusion are applied [19][20][21].…”