Maximum Torque per Ampere Control of a Single-Phase Permanent Magnet Synchronous Motor, Part 1: Maximum Torque Capabilit
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ORIGINAL ARTICLE
Maximum Torque per Ampere Control of a Single‑Phase Permanent Magnet Synchronous Motor, Part 1: Maximum Torque Capability Analysis Seungbo Choi2 · Wook‑Jin Lee1 Received: 17 December 2019 / Revised: 22 April 2020 / Accepted: 7 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In this paper, a method for analyzing the torque capability of single-phase permanent magnet synchronous motor (SP-PMSM) is proposed. It is an important factor to verify the torque capability of a motor with respect to the motor design and control. This paper proposes the analysis of the motor capability under the inverter output voltage and current constraints using the phasor diagram. Since, the torque capability of the SP-PMSM is determined by both the DC-link voltage and rated current of the motor and the inverter, the torque capability curve of the SP-PMSM is analyzed through these limitations and the motor parameters. The magnitude and the phase of the inverter output voltage for the maximum torque per ampere are explicitly calculated. Several simulation and experimental results are presented to verify the proposed theoretical analysis. Keywords Single-phase permanent magnet synchronous motor · Maximum torque · Minimum copper loss · Torque capability curve
1 Introduction Permanent magnet synchronous motors (PMSMs) are widely used not only in industrial equipment but also in household appliances [1–4]. Motor drive systems using PMSMs and inverters have benefits of high efficiency, high power density, and rapid dynamic response compared to induction motors [5–8]. Single-phase permanent magnet synchronous motor (SP-PMSM) is used for domestic appliances that require compact volume, because it is relatively easy to design the shape of the stator core to minimize the system volume [9, 10]. Also, the inverter for SP-PMSM has an edge in price competitiveness thanks to fewer power switches than the three-phase counterpart. Therefore, it has been used in small form factor household appliances. * Wook‑Jin Lee [email protected] Seungbo Choi [email protected] 1
Department of Electrical Engineering, Chungnam National University, Daejeon, South Korea
School of Integrated Technology, Gwangju Institute of Science and Technology, Gwangju, South Korea
2
Three-phase PMSM (3P-PMSM) is mainly used in the industry because of their efficiency and high torque performance, and many studies have been published to obtain the optimum torque capability [11–26]. In 3P-PMSM drives, maximum torque per ampere (MTPA) controls and fluxweakening controls were introduced in the low-speed and the high-speed ranges, respectively [11–14]. The inductance saturation is considered to drive MTPA operation [11, 12]. In high-speed range, flux weakening schemes are introduced by properly designing the controller or stator winding [13, 14]. However, there has been no study for SP-PMSMs on how to improve the torque capability by controlling the inverter output voltage [15–24]. There are many studies to reduce losses greatly for
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