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Equivalent circuit and characteristics of an induction motor with reduced turns of terminal coils
Author(s) -
Hitosugi Kazuyoshi,
Moriyasu Shoji,
Nanba Noriyuki
Publication year - 2001
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.1104
Subject(s) - overvoltage , terminal (telecommunication) , inverter , adjustable speed drive , electrical engineering , induction motor , waveform , universal motor , voltage , transient (computer programming) , engineering , control theory (sociology) , computer science , control (management) , telecommunications , artificial intelligence , operating system
Abstract The use of a PWM inverter with high switching characteristic for adjustable speed drive systems causes an overvoltage with steep‐fronted waveform on the motor terminals. Since this steep‐fronted transient voltage in an inverter drive heavily loads the terminal coils of the motor winding, insulation failure in the motor winding occurs mostly in the terminal coils. Therefore, it is reasonable to reduce the turns of only the terminal coils and to increase the dielectric strength of the interturn insulation. This describes an equivalent circuit taking the space harmonic into account and discusses the starting and operating characteristics of the induction motor with reduced turns of the terminal coils. © 2001 Scripta Technica, Electr Eng Jpn, 137(4): 64–75, 2001