Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1994-07-05
1995-11-21
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 37, 363 98, H02M 5458, H02H 712
Patent
active
054693519
ABSTRACT:
A fault isolation system for a three-phase induction motor drive system includes an inverter to convert direct-current power from a battery into alternating current for the three phases of the motor. The inverter contains six semiconductor switches, two for each phase of the motor, as is conventional in the art of induction motor control. Further, the inverter contains two additional semiconductor switches. These switches form an output connected, via a dummy load in parallel with a third additional semiconductor switch, to the neutral connection of the motor. In the event that any of the six conventional switches in the inverter become short-circuited, the four switches in the other two phases of the inverter as well as the two additional switches are actuated to generate current sufficient to blow a fuse connected in series with the output of the inverter coupled to the short-circuited switch. The motor is thus isolated from the short-circuited switch, preventing the short-circuited switch from totally disabling the motor. An alternative motor drive strategy, such as a two-phase drive strategy, can then be employed.
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"A Strategy To Isolate The Switching Sevice Fault Of A Current Regulated Drive Motor" by Fu and Lipo, 1993 IEEE Industry Applications Society, Toronto, Ontario, Canada, Oct. 2-8, 1993, pp. 1015-1020.
"A Strategy For Improving Relieability Of Field Oriented controlled Induction Motor Drives" by Liu et al, 1991 IEEE Industry Applications Society, Sep. 28-Oct. 4, 1991, pp. 449-455.
"Improving Reliability Of Induction Motor Drives By Means Of Fast Acting Current Regulation" by Lipo and Fu, 1st European Conference On Reliability Standardization & Certification of Industrial Electric Drives, May 25-27, 1992, Milan, Italy, pp. 1-16.
Liang Feng
Masrur Md A.
Xu Xingyi
Ford Motor Company
Krishnan Aditya
May Roger L.
Sparschu Mark S.
Wong Peter S.
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