Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse or diversely controlled sources of armature...
Patent
1995-08-24
1997-05-13
Sircus, Brian
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural, diverse or diversely controlled sources of armature...
318808, 318441, 303 41, H02P 540, B60L 930
Patent
active
056295928
ABSTRACT:
While an electric vehicle is traveling in a DC section, a ripple component detecting unit detects a ripple component appearing on a filter capacitor voltage and adds the ripple component onto an inverter frequency reference in such manner as to cancel an influence in a motor current caused by the ripple component. On the other hand, while in an AC section, a damping control component detecting unit detects a magnitude of fluctuation of a DC power supplied from a DC power line as a damping control component and adds the component, like the ripple component in the AC section, onto the inverter frequency reference in such manner as to cancel an influence in the motor current caused by the damping control component. Consequently, an output current from the inverter which is to be supplied to the induction drive motor becomes very steady of ripple-free and it improves comfort for passengers on the electric vehicle.
REFERENCES:
patent: 3461366 (1969-08-01), Koppelmann
patent: 3736480 (1973-05-01), Lee
patent: 4823066 (1989-04-01), Yoshiki et al.
patent: 5214367 (1993-05-01), Uesugi
patent: 5250890 (1993-10-01), Tanamachi et al.
patent: 5442271 (1995-08-01), Hatanaka et al.
Patent Abstract of Japan, vol. 12, No. 130, (E-603) (1988) and JP-A-62 254691, Mitsubishi Electric Corp. (1987).
Kabushiki Kaisha Toshiba
Sircus Brian
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