Air-conditioning apparatus with switched connection states of windings of compressor motor prior to defrost operation
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United States of America Patent
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Oct 12, 2021
Grant Date -
Jul 9, 2020
app pub date -
Aug 17, 2017
filing date -
Aug 17, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
An air-conditioning apparatus includes a refrigerant circuit including a compressor, an indoor-side heat exchanger, and an outdoor-side heat exchanger; a drive circuit configured to drive an electric motor; a connection switching device configured to switch connection of stator windings of the electric motor between a first connection state and a second connection state higher in line-to-line voltage than the first connection state; and a controller configured to perform defrosting operation for removing frost formed on the outdoor-side heat exchanger and cause the connection switching device to switch connection. In performing the defrosting operation with the stator windings being in the second connection state, the controller causes the connection switching device to switch the connection of the stator windings from the second connection state to the first connection state.
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