Electric drive system
AssigneeGould Inc.
InventorsThomas M. Jahns, Vytautas Janonis
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Abstract
An electric drive system uses a multiphase alternating current motor and inverter to convert power from a battery source to provide propulsion. The phase sets defined by the motor stator winding are excited by a corresponding plurality of inverters. Time harmonic currents in the windings are effectively suppressed by providing the drive motor in a configuration having high leakage inductance in the stator winding. The windings are arranged in sets of multiples of three-phase windings. In the illustrated embodiment, the inverters are arranged to define three-phase inverters for exciting m sets, where m.gtoreq.2, of three-phase windings of the motor stator. The number of multiphase winding sets is determined in a manner that eliminates the need for paralleling of inverter switching devices.
Claims12
An electric drive system comprising:
- a DC power source;
- a multiphase AC motor, said motor having:
- N stator winding phases, where N is a multiple of three, and m stator winding sets, where m is at least two;
- said stator winding sets being constructed to provide the highest possible value of stator slot leakage inductance per phase for a given stator geometry;
- wherein the stator winding coil sides located in the stator slots for each winding of each set are wound such that each slot contains coil sides belonging only to the same phase;
- a plurality of inverters connected one each to said winding sets from said DC power source;
- means for controlling said inverters to excite said winding sets successively, and
- a propulsion means driven by said motor.
Dependencies are inferred from the claim text.