Design and Control Method for Interior Permanent Magnet Synchronous Machine Drive with Capacitor Power Network

Hyeon Gyu Choi, Kahyun Lee, Jung Ik Ha

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This article proposes a method to extend the operating area of the interior permanent magnet synchronous machines (IPMSMs). In general, the power factor (PF) of the voltage source inverter becomes lower to maintain the maximum torque per ampere (MTPA) current of the motor. Therefore, the voltage-ampere (VA) capacity of the inverter is not fully utilized. In order to maximize the VA capacity utilization of the inverter, the capacitor network is proposed, which is located between the motor and the inverter. The PF of the inverter increases, as the capacitive impedance of the network cancels the inductive motor impedance. In this way, the maximum speed of the constant torque region increases without changing the inverter and the motor. Due to the capacitor network, this method generates a higher power than the conventional drive method. The design method and analysis results of the capacitor network are presented. The current control method in the proposed system is also presented. At the end of this article, the effectiveness of the proposed system is verified through the experimental results.

Original languageEnglish
Article number8930552
Pages (from-to)259-273
Number of pages15
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number1
StatePublished - Feb 2021

Bibliographical note

Funding Information:
Manuscript received July 24, 2019; revised September 27, 2019 and November 11, 2019; accepted November 16, 2019. Date of publication December 10, 2019; date of current version January 20, 2021. This work was supported in part by the Brain Korea 21 Plus Project in 2019 and in part by the Seoul National University Electric Power Research Institute. Recommended for publication by Associate Editor Fernando Briz. This paper was presented in part at the Energy Conversion Congress and Exposition (ECCE), Portland, OR, USA, September 23–27, 2018. (Corresponding author: Jung-Ik Ha.) H.-G. Choi and J.-I. Ha are with the Department of Electrical and Computer Engineering, Institute of Electric Power Research, Seoul National University, Seoul 08826, South Korea (e-mail:;

Publisher Copyright:
© 2013 IEEE.


  • AC machine
  • passive circuits
  • power amplifiers
  • variable speed drives


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