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Efficient power regeneration and drive of an induction motor by means of optimal torque derived by the variational method
Author(s) -
Inoue Kaoru,
Ogata Kenji,
Kato Toshiji
Publication year - 2010
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.21010
Subject(s) - torque , regenerative brake , control theory (sociology) , brake , direct torque control , induction motor , power (physics) , torque motor , energy (signal processing) , engineering , damping torque , electric motor , stall torque , motor soft starter , automotive engineering , control engineering , computer science , voltage , physics , electrical engineering , control (management) , quantum mechanics , artificial intelligence , thermodynamics
When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation is converted to electrical energy. When the regenerative torque is large, the corresponding current increases so that the copper loss also becomes large. On the other hand, the damping effect of rotation increases with time when the regenerative torque is small. In order to use this limited energy effectively, the optimal regenerative torque should be ascertained in order to maximize the regeneration of electrical energy. This paper proposes a methodology, based on the variational method, for the design of regenerative torque for an induction motor in order to maximize the regenerative electric energy. Similarly, the optimal torque for acceleration is derived in order to minimize the driving energy. Finally, an efficient motor drive system with the proposed optimal torque and a power storage system stabilizing the DC link voltage will be proposed. The effectiveness of the proposed methods is illustrated by simulations and experiments. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(1): 41–50, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.21010