Abstract
In this paper, a new maximum torque per ampere (MTPA) control method for surface permanent magnet synchronous motors (SPMSMs) controlled by the scalar control (v/f) method is proposed. The scalar control is a sensorless method that controls only the magnitude and the frequency of the stator voltage vector without the information of the rotor position. This method suggests the injection of the high frequency voltage signal in the stator current vector reference frame, which can be calculated from the measured phase currents, to avoid the use of rotor position information. In addition, this method adjusts only the magnitude of the stator voltage to minimize the stator current based on the calculated input power. Another merit of this method is the robustness of the MTPA control to machine parameter errors or variations. With this proposed method, the stator current can be minimized in the whole speed-torque range and the drive efficiency can be improved. Simulation and experimental results are provided to verify the performance of this control strategy.
Highlights
Energy saving is a crucial issue in many industrial applications
We propose a maximum torque per ampere (MTPA) control method that can enhance the efficiency of surface permanent magnet synchronous motor (SPMSM) controlled by the v/f scalar control method by minimizing the stator current
We propose the adjustment of the stator voltage magnitude to achieve the MTPA control for v/f scalar controlled SPMSM drives, which can maintain the minimum stator current at all operating conditions
Summary
Energy saving is a crucial issue in many industrial applications. Permanent magnet synchronous motors (PMSMs) have replaced induction machines (IMs) since PMSMs offer higher power density and efficiency than IMs. We propose a MTPA control method that can enhance the efficiency of SPMSMs controlled by the v/f scalar control method by minimizing the stator current This method applies for the scalar-controlled drives that do not require the information of the rotor position. In [11], the high frequency current signal is injected and the speed variation instead of the torque variation is used to track MTPA points The performance of this method is limited by the resolution of the speed/position sensor. We propose a new MTPA control method suitable for scalar-controlled SPMSM drives This method injects the high frequency voltage signal to track the MTPA operating points and does not use the rotor position information. We verify the performance of this method using simulation and experimental results
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