Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-04-01
2008-11-18
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S727000, C318S799000, C318S801000, C318S434000, C318S434000
Reexamination Certificate
active
07453231
ABSTRACT:
An object of the present invention is to provide an electric vehicle control device which is capable of detecting even a state in which only one phase of one induction motor is disconnected in a system where a plurality of induction motors are connected in parallel with each other and driven by one vector-controlled inverter device. The electric vehicle control device according to the present invention includes a torque calculation unit (5) for calculating the torque of the induction motor on the basis of a q-axis current I1q, a d-axis current I1d, a q-axis voltage command E1qr, a d-axis voltage command E1dr, and an inverter angular frequency ωinv, which are obtained by a vector control unit (2), a torque variation width calculation unit (6) that calculates the torque variation width from a maximum value and a minimum value of a torque calculation result in a predetermined time width on the basis of the torque calculation result, and a comparator (7) that outputs a disconnection detection signal when the torque variation width exceeds the torque variation width reference value.
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International Search Report dated Jul. 19, 2005.
Maruyama Takafumi
Negoro Hideto
Buchanan & Ingersoll & Rooney PC
Ip Paul
Mitsubishi Electric Corporation
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