Pole change induction motor and control apparatus and method for the same
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United States of America Patent
Stats
-
Dec 28, 1999
Grant Date -
N/A
app pub date -
Dec 12, 1995
filing date -
Dec 12, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for a pole change induction motor and control method for the same which are applicable to, for example, a driving source of an electric vehicle without power transmission are disclosed. In the control apparatus and method for the pole change motor is electrically changed between an n number of poles and a 2n number of the poles (n=2, 4, - - - ) so as to secure an output torque of the pole change induction motor in a constant driving mode with a high rotation speed of the induction motor without increase in a dimension of either of the induction motor or an inverter associated with the pole change induction motor and without occurrence in a torque variation. In a preferred embodiment, two channels of exciting and torque instructions and slip frequency generators (current instruction calculating blocks and current control systems) are provided for the n number of pole driving and 2n number of pole driving.
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