REVERSIBLE DEVICE FOR SPEED CONTROL OF SINGLE-PHASE ASYNCHRONOUS ELECTRIC MOTOR Russian patent published in 2022 - IPC H02P1/42 H02P27/48 

FIELD: engine building.

SUBSTANCE: single-phase asynchronous motor speed reversing device relates to frequency converters driven by single-phase AC network, and can be used in controlled AC electric drive for supply from single-phase network of single-phase asynchronous motors. Possibility of rotor rotation frequency regulation is stipulated by change of semiconductor commutator connection circuit, introduction of the third and fourth semiconductor commutators. Device contains four semiconductor switches, each of which contains two semiconductor switches made in the form of anti-parallel connected transistors intended for supply of stator windings of the motor. In the first semiconductor switch, the emitter of the first transistor is connected to the collector of the second transistor and is connected to the ends of the first and second stator windings, collector of the first transistor is connected to the emitter of the second transistor and is connected to zero of the supply network. In the second semiconductor switch, the emitter of the third transistor is connected to the collector of the fourth transistor, the collector of the third transistor is connected to the emitter of the fourth transistor and is connected to zero of the supply network. In the third semiconductor switch, the emitter of the fifth transistor is connected to the collector of the sixth transistor, the collector of the fifth transistor is connected to the emitter of the sixth transistor and is connected to the phase of the supply network. Common leads of the emitter of the third transistor and collector of the fourth transistor, the emitter of the fifth transistor and the collector of the sixth transistor are combined and connected to the beginning of the first stator winding. In the fourth semiconductor switch, the emitter of the seventh transistor is connected to the collector of the eighth transistor and to the beginning of the second stator winding, collector of the seventh transistor is connected to the emitter of the eighth transistor and is connected to the phase of the supply mains.

EFFECT: provision of asynchronous motor rotation frequency control.

1 cl, 20 dwg