The leading power factor operation of synchronous motor finds application in power factor correction.
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The operation of a synchronous motor is simple to imagine.
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This operation of synchronous motor in over-excited mode to correct the power factor is sometimes called as Synchronous condenser.
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These include an IPC system call that supports a send as well as a receive operation, making all IPC synchronous, and passing as much data as possible in registers.
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In a client-server system, most communication is essentially synchronous, even if using asynchronous primitives, as the typical operation is a client invoking a server and then waiting for a reply.