Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2007-02-13
2007-02-13
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S434000, C318S436000, C318S371000, C318S374000, C318S376000, C701S019000, C701S020000
Reexamination Certificate
active
11107737
ABSTRACT:
A control apparatus for an electric railcar that provides control so that when rotational speed of a motor decreases below a required value, torque of the motor will decrease at a required rate of change, a current limiter for limiting a torque current command “(A)Iqp” output from a current command arithmetic unit is provided to ensure that when the rotational speed of the motor decreases below the required value, the torque current command will be limited to a command value “(B)Iqp” smaller than that command value, and to ensure that a carrier frequency at which PWM signals are created when switching elements of the electric power converter are controlled by carrier generator is controlled to become lower than a carrier frequency existing when the rotational speed of the motor decreases below the required value.
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Horie Akira
Shimada Motomi
Antonelli, Terry Stout and Kraus, LLP.
Donovan Lincoln
Hitachi , Ltd.
Smith Tyrone
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