Challenge of triple-zero technology for five-phase SRM

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K21968
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Itoh Junichi 長岡技術科学大学, 工学研究科, 教授 (90377218)
• Project Period (FY): 2019-06-28 – 2021-03-31
• Keywords: SRM / 5相 / 機電一体

Outline of Final Research Achievements

Switched reluctance motor (SRM) has drawbacks of a large torque ripple, large DC input current ripple, and large radial force ripple. These ripples lead to the vibration, acoustic noise, and battery deterioration. The three-phase SRM does not have enough control flexibilities during no-negative torque period to simultaneously reduce the multiple ripples. Therefore, it is necessary for the simultaneous reduction of multiple ripples to positively use the negative torque period, which resulting in extremely increases the motor current root-mean-square (RMS) value. As a result, the efficiency is significantly deteriorated compared with a general driving method. The proposed method made these three ripples simultaneously zero, which is so-called “triple zero” in this paper with improved control flexibility of five-phase. In particular, the triple zero is achieved with the same motor current RMS as general driving method by utilizing the control flexibility effectively.

Free Research Field

パワーエレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

近年，電気自動車やハイブリッド自動車の普及に伴い，駆動用モータの需要が高まっている。現在，永久磁石同期モータは，高効率で高性能なため，駆動用モータとして広く採用されているが，レアアースであるネオジム磁石を多用するため，安定供給の観点で問題がある。本研究では，レアアースを使用しないスイッチトリラクタンスモータの高効率化と高性能化を両立する革新的な研究であり，本成果によって，電動化の時代において高効率で高性能なモータの持続的な供給が期待できる。