Static inverter circuit for induction motor - has pushpull transistors and main bifilar winding formed by stator winding

摘要

The static inverter, is for an induction motor that drives the compressor of a caravan refrigerator. It consists of two pushpull transistors connected by their emitters to the positive dc supply pole and by their collectors to opposite ends of a winding. Their bases are connected to opposite ends of a control winding. The first winding (4) is formed by the stator winding of the motor. The control winding (11) is wound over the stator winding. Each winding is bifilar and has the end of one wire connected to the opposite end of the other wire to give a tapping point (4c or 11c) along the winding. The first winding tapping point is connected to the negative supply pole and the control winding tapping over two resistors to both poles.