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Reversible switching device for starting a three-phase asynchronous squirrel-cage motor from a single-phase network
Reversible switching device for starting a three-phase asynchronous squirrel-cage motor from a single-phase network
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机译：用于从单相网络启动三相异步鼠笼式电动机的可逆开关装置
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摘要
The reversible switching device for starting a three-phase asynchronous squirrel-cage electric motor from a single-phase network is intended for use in an electric drive for starting three-phase asynchronous electric motors, the stator windings of which are connected according to the "triangle" scheme. Each of the four reversible semiconductor switches of the device contains two counter-parallel connected transistors designed to power the stator windings of the electric motor when connecting the stator windings according to the "triangle" scheme. In the first switch, the collector of the first transistor is connected to the emitter of the second transistor, and their common output is designed to connect to the phase of the supply network; the emitter of the first transistor is connected to the collector of the second transistor, and their common output is designed to connect to the common output of the first and second stator windings. In the second switch, the collector of the third transistor is connected to the emitter of the fourth transistor, and their common output is used to connect to the supply network zero, the emitter of the third transistor is connected to the collector of the fourth transistor, and their common output is designed to connect to the common output of the second and third stator windings. In the third switch, the collector of the fifth transistor is connected to the emitter of the sixth transistor, and their common output is for connecting to the phase of the supply network, and the emitter of the fifth transistor is connected to the collector of the sixth transistor, and their common output is for connecting to the common output of the first and third stator windings. In the fourth switch, the collector of the seventh transistor is connected to the emitter of the eighth transistor, and their common output is for connecting to a zero of the mains supply, and the emitter of the seventh transistor is connected to the collector of the eighth transistor, and their common output is for connecting to the common output of the first and second stator windings. A reverse is ensured with increased energy indices due to the shape of the electromagnetic field of the stator, which is close to circular, which gives an increased value of the average moment developed by the engine.
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