MTPA operation scheme with current feedback in V/f control for PMSM drives
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ORIGINAL ARTICLE
MTPA operation scheme with current feedback in V/f control for PMSM drives Won‑Jae Kim1 · Sang‑Hoon Kim2 Received: 27 June 2019 / Revised: 25 September 2019 / Accepted: 30 October 2019 / Published online: 5 February 2020 © The Korean Institute of Power Electronics 2020
Abstract In this paper, an Maximum Torque Per Ampere (MTPA) operation scheme with current feedback to improve the driving efficiency in the V/f control for Permanent-Magnet Synchronous Motor (PMSM) drives is proposed. In the V/f control for PMSM drives, the proper current distribution of the MTPA currents is not assured depending on the magnitude of the stator voltage. Moreover, PMSM drives become unstable due to an absence of damper windings. In this paper, for both MTPA operation and stabilization, a scheme of using only a single Proportional Integral (PI) controller is proposed. The magnitude of the stator voltage, for the MTPA, is adjusted by employing the information of the load acquired from the PI controller, which uses the d-axis current deviation from the required MTPA current. For stable operation, the stator frequency is adjusted using the information on the rotor speed variation extracted from the proportional part of the controller. To obtain this information from the PI controller, its gains are designed through an analysis of the whole drive system. Simulation and experimental results confirm the effectiveness of the proposed scheme. Keywords MTPA operation · Permanent-magnet synchronous motor · Stabilization · V/f control
1 Introduction Since Permanent-Magnet Synchronous Motors (PMSMs) have good characteristics such as dense power, high efficiency and fast dynamics, PMSMs have been used in a wide range of applications for various power capacities. The control techniques in PMSM drives can be divided into two types: vector control and open-loop control. Vector control is generally applied to applications that require high driving performance such as electric vehicles, robots and 3D printers. The position information of the rotor is necessary for controlling the stator current vector in vector control. In most variable-torque and variable-speed drives, some types of speed or position sensors such as resolvers and encoders are commonly used for obtaining the rotor position information. However, position sensors have a * Sang‑Hoon Kim [email protected] 1
Department of Electrical and Medical Convergent Engineering, Kangwon National University, Chuncheon, Korea
Department of Electrical and Electronics Engineering, Kangwon National University, Chuncheon, Korea
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number of disadvantages including increases in system cost and volume was well as reductions in reliability and noise immunity. Therefore, alternatives for acquiring the position information of rotors have been studied [1–7]. The authors of [1–4] obtained the position information of rotors from the back-electromotive force (EMF) information. Back-EMF based techniques are capable of providing satisfactory performance within the me
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