초록 ▼

A dual stator winding induction machine has two windings with input terminals which are supplied separately with drive power. The two stator windings have a different number of poles to essentially eliminate the magnetic coupling between the two windings and to decouple the torques produced by each

A dual stator winding induction machine has two windings with input terminals which are supplied separately with drive power. The two stator windings have a different number of poles to essentially eliminate the magnetic coupling between the two windings and to decouple the torques produced by each set of windings. Power is supplied to the two windings by two separate variable frequency inverter drives to provide two independently controllably torque components. At low speed, the power supplied to one of the windings can produce torque which opposes the torque from the power applied to the other winding, so that very low speed and standstill operation can be achieved while the frequency of the power supplied by the inverters is always greater than the minimum frequency. At higher operating speeds, power is supplied to the two windings so that the torque from the windings adds. The dual stator machine can be built with minimal modifications to standard winding configurations.

대표청구항 ▼

[ What is claimed is:] [1.]1. A motor drive system comprising:(a) a polyphase induction motor comprising a stator having two separate stator windings with separate input terminals for each winding by which drive power may be applied separately to the two windings, wherein the two windings have a dif

[ What is claimed is:] [1.]1. A motor drive system comprising:(a) a polyphase induction motor comprising a stator having two separate stator windings with separate input terminals for each winding by which drive power may be applied separately to the two windings, wherein the two windings have a different number of poles that are in the ratio 1:3, and a squirrel cage rotor mounted within the stator;(b) a first power inverter connected to the input terminals of a first of the stator windings that has the lower number of poles, the first power inverter providing output power at a selectable frequency; and(c) a second power inverter connected to the input terminals of a second of the stator windings that has the higher number of poles, the second power inverter providing output power at a frequency which can be selected separately from the frequency of the output power provided by the first power inverter.