Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions
This paper analyzes the electromagnetic characteristics of an interior permanent magnet synchronous motor (IPMSM) for electric vehicle traction under various control imbalance conditions in a twin inverter system, assuming that one of the inverters fails to operate properly. The imbalance conditions...
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2025-06-01
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| author | Jae-Gak Shin Hong-Jae Jang Tae-Su Kim Ki-Chan Kim |
| author_facet | Jae-Gak Shin Hong-Jae Jang Tae-Su Kim Ki-Chan Kim |
| author_sort | Jae-Gak Shin |
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| description | This paper analyzes the electromagnetic characteristics of an interior permanent magnet synchronous motor (IPMSM) for electric vehicle traction under various control imbalance conditions in a twin inverter system, assuming that one of the inverters fails to operate properly. The imbalance conditions are first investigated through dynamometer experiments and then applied to finite element method (FEM) simulations to evaluate their electromagnetic effects. Since the focus is on scenarios where a single inverter malfunctions, a stator winding configuration is first redefined to ensure stable operation in a single inverter system by preventing voltage and current imbalances within the circuit. When the stator winding is configured with eight parallel paths, the dynamometer test results show a phase voltage imbalance. However, when the number of parallel circuits is reduced to four, this voltage imbalance disappears. Using this configuration, a twin inverter system is constructed, and various imbalance conditions are applied to intuitively examine the electromagnetic characteristics when one inverter fails to accurately control current magnitude or phase angle. The simulation results showed that applying unbalanced conditions to the current and current phase angle led to a decrease in torque and an increase in torque ripple. In addition, when one of the inverters was completely disconnected, the motor performance analysis showed that it operated with approximately half of its original performance. Based on dynamometer experiments and finite element method (FEM) simulations, the electromagnetic characteristics under inverter fault conditions and appropriate stator winding configurations were analyzed. When an optimal number of parallel circuits is applied to the stator winding and a twin inverter system is employed, the load on each individual inverter is reduced, enabling accurate control. This makes the application to high-voltage and high-current systems feasible, allowing higher performance. Moreover, even if one inverter fails, the system can still operate at approximately half its capacity, ensuring high operational reliability. |
| format | Article |
| id | doaj-art-1badee5f377f4cdca54a2abde09f1932 |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-1badee5f377f4cdca54a2abde09f19322025-08-20T03:28:28ZengMDPI AGEnergies1996-10732025-06-011813341510.3390/en18133415Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating ConditionsJae-Gak Shin0Hong-Jae Jang1Tae-Su Kim2Ki-Chan Kim3Department of Electrical Engineering, Hanbat National University, Daejeon 34158, Republic of KoreaDaewon Electrification R&D Center Research Engineer, Daewon Kang Up Co., Ltd., Ansan 15434, Republic of KoreaDepartment of Electrical Engineering, Hanbat National University, Daejeon 34158, Republic of KoreaDepartment of Electrical Engineering, Hanbat National University, Daejeon 34158, Republic of KoreaThis paper analyzes the electromagnetic characteristics of an interior permanent magnet synchronous motor (IPMSM) for electric vehicle traction under various control imbalance conditions in a twin inverter system, assuming that one of the inverters fails to operate properly. The imbalance conditions are first investigated through dynamometer experiments and then applied to finite element method (FEM) simulations to evaluate their electromagnetic effects. Since the focus is on scenarios where a single inverter malfunctions, a stator winding configuration is first redefined to ensure stable operation in a single inverter system by preventing voltage and current imbalances within the circuit. When the stator winding is configured with eight parallel paths, the dynamometer test results show a phase voltage imbalance. However, when the number of parallel circuits is reduced to four, this voltage imbalance disappears. Using this configuration, a twin inverter system is constructed, and various imbalance conditions are applied to intuitively examine the electromagnetic characteristics when one inverter fails to accurately control current magnitude or phase angle. The simulation results showed that applying unbalanced conditions to the current and current phase angle led to a decrease in torque and an increase in torque ripple. In addition, when one of the inverters was completely disconnected, the motor performance analysis showed that it operated with approximately half of its original performance. Based on dynamometer experiments and finite element method (FEM) simulations, the electromagnetic characteristics under inverter fault conditions and appropriate stator winding configurations were analyzed. When an optimal number of parallel circuits is applied to the stator winding and a twin inverter system is employed, the load on each individual inverter is reduced, enabling accurate control. This makes the application to high-voltage and high-current systems feasible, allowing higher performance. Moreover, even if one inverter fails, the system can still operate at approximately half its capacity, ensuring high operational reliability.https://www.mdpi.com/1996-1073/18/13/3415IPMSMtwin inverterimbalance conditioninverter failureEV traction motorelectromagnetic characteristics |
| spellingShingle | Jae-Gak Shin Hong-Jae Jang Tae-Su Kim Ki-Chan Kim Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions Energies IPMSM twin inverter imbalance condition inverter failure EV traction motor electromagnetic characteristics |
| title | Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions |
| title_full | Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions |
| title_fullStr | Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions |
| title_full_unstemmed | Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions |
| title_short | Study on the Electromagnetic Characteristics of a Twin Inverter System EV Traction Motor Under Various Operating Conditions |
| title_sort | study on the electromagnetic characteristics of a twin inverter system ev traction motor under various operating conditions |
| topic | IPMSM twin inverter imbalance condition inverter failure EV traction motor electromagnetic characteristics |
| url | https://www.mdpi.com/1996-1073/18/13/3415 |
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