Electricity: motive power systems – Induction motor systems – With voltage source connected to motor secondary
Reexamination Certificate
2005-01-25
2005-01-25
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
With voltage source connected to motor secondary
C318S132000, C318S771000, C318S254100, C322S022000
Reexamination Certificate
active
06847185
ABSTRACT:
It is an object to provide a winding switching device of a three-phase AC motor having a small size at a low cost in which a time required for switching a winding is shortened and the number of semiconductor switch units is decreased as much as possible. In a winding switching device of a three-phase AC motor including an AC motor in which a winding having each phase is formed by a plurality of windings and a connecting terminal connecting the windings to each other and both terminals of the winding having the phase are provided on an outside of a motor, winding switching means for properly switching the connecting terminal, and a variable frequency power source for supplying a variable voltage having a variable frequency to the AC motor, the winding switching means is constituted by a plurality of three-phase rectifying means connecting one of ends of the winding having the phase to the variable frequency power source and connecting the other end and the connecting terminal to an input terminal on an AC side of the three-phase rectifying means for each phase, and a semiconductor switch provided to open and close both ends on a DC output side of the three-phase rectifying means.
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IEEE Transactions on Industry Applications, vol. 32, No. 4 Jul./Aug. 1996, M. Osama et al.: “A New Inverter Control Scheme for Induction Motor Drives Requiring Wide Speed Range”, pp. 938-944.
Kume Tsuneo
Mahesh Swamy
Ip Paul
Kabushiki Kaisha Yaskawa Denki
Westerman Hattori Daniels & Adrian LLP
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