Patent ID: 6208537
Filing Date: 2001-03-27
Classification: H02M

Abstract:
An apparatus for reducing reflected line voltages on AC supply lines of an AC motor, the motor having first, second and third stator windings, each winding separately connected to an alternating voltage source by either a first, second or third supply line, the voltage source supplying high frequency voltage pulses on each supply line, the apparatus comprising:a current limiter positioned between the source and motor to limit current on the supply lines;N filter configurations, each filter configuration comprising:a first leg including a first voltage storage element and a first inductive element arranged in series between the first line and a common node;a second leg including a second voltage storage element and a second inductive element arranged in series between the second line and the common node; anda third leg including a third voltage storage element and a third inductive element arranged in series between the third line and the common node;wherein the common node is only linked to the legs;wherein inductive elements in the same filter configuration have essentially the same values and voltage storage elements in the same filter configuration have essentially the same values.