Peak power shaving of an electric injection molding machine with supercapacitors

Hirofumi Akiyoshi, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto, Tadayoshi Matsuo, Kiyoshi Ochi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


In this paper, we propose the control method of a peak shaving system for an electric injection molding machine (EIMM). The peak power shaver consists of a multiphase bidirectional dc-dc converter and supercapacitors (SCs), and is connected to a dc link of the inverter fed injection motor drive system of the EIMM. In the proposed control method, electric power is stored in the SCs through the multiphase bidirectional dc-dc converter with a pulsewidth- modulation rectifier while the injection motor is at rest. When the injection motor is accelerating, the stored power in the SCs together with the power from the distribution feeders is supplied to the injection motor. Thus, the peak power can be shaved. The basic principle of the proposed control method is discussed in detail, then confirmed by digital computer simulation and experimental setup. The simulation and experimental results demonstrate that the peak power is shaved by 70% using the peak power shaving system.

Original languageEnglish
Article number6553384
Pages (from-to)1114-1120
Number of pages7
JournalIEEE Transactions on Industry Applications
Issue number2
Publication statusPublished - Jan 1 2014
Externally publishedYes


  • Energy storage
  • multiphase bidirectional dc-dc converter
  • pulsewidth-modulation (PWM) rectifier
  • supercapacitor (SC)
  • three-phase digital phase-locked loop (PLL)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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