Abstract
This paper proposes a back electromotive force estimation error compensation method for accurate rotor position estimation of surface mounted permanent magnet synchronous motors. When estimating the rotor position of surface mounted permanent magnet synchronous motor sensorless drives, a direct current offset error component occurs in the voltage sensor. As a result, the rotor position is distorted and the sensorless control in surface mounted permanent magnet synchronous motor is degraded. In addition, the dq-axis voltages in the synchronous reference frame have the direct current offset error component, ripples compared with the motor frequency under the distorted rotor position. In this paper, the effects of the direct current offset errors are analyzed based on the synchronous reference frame phase locked loop. To remove this direct current offset error component, a d-axis voltage is converted into a synchronous reference frame again to compensate. In other words, it is a dual synchronous coordinate conversion compensation method. The compensator utilizes a proportional-integral controller that compensates by estimating the direct current offset error component. The proposed method is useful for the improvement of surface mounted permanent magnet synchronous motor sensorless control and operating performance. The effectiveness of the proposed algorithm is verified through PSIM simulation and experimental results.
Highlights
Permanent magnet synchronous motors (PMSMs) have advantages such as high torque density and efficiency, robust structure, low inertia efficiency compared with output torque and excellent control performance
A PMSM performs vector control based on current control, and rotor position information is essential to perform vector control, the encoders and resolvers used to acquire the position information of the rotor are not used because they increase system cost, volume, mechanical attachment and impair system reliability
The sensorless methods can be roughly divided into back electromotive force estimation- based methods [3,4,5,6,7,8] and methods based on inductance changes according to the rotor position [9,10]. generally, the back-EMF based methods estimate the back-EMF using the stator voltages and motor currents without requiring any additional high frequency signal injection and the inductance-based methods estimate the inductance value through an external signal injection
Summary
Permanent magnet synchronous motors (PMSMs) have advantages such as high torque density and efficiency, robust structure, low inertia efficiency compared with output torque and excellent control performance. Analog electric device, and ADC quantization errors [11,12,13,14] At this time, the main component of a distortion occurs in following position theerror, rotor,and andwhen the sensorless control any occurring nonlinear errors is the directthe current (DC) of offset this DC offset error and operation performance the SPMSM are degraded. The algorithm in [16] requires complex procedures store the controller output data and Fourier series expansion to analyze the harmonics that are present to minimize the periodic torque ripple resulting from current measurement errors. It needs a memory in thetostored data. W validity of the proposed method was verified by simulation using PSIM and experiments using a 20 W SPMSM
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