Procedure for reducing the starting current of a squirrel-cage motor, and a squirrel-cage motor unit designed for implementing the procedure
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United States of America Patent
Stats
-
Sep 19, 1995
Issued Date -
N/A
app pub date -
Dec 8, 1994
filing date -
Feb 18, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for reducing the starting current of a squirrel-cage motor and a squirrel-cage motor unit designed for implementing the method for reducing the starting current. The squirrel-cage motor stator winding of each phase comprises at least two insulated conductor elements connected in parallel and placed in the same slots. The conductor elements are divided into at least two parallel branches. During starting one or more branches are disconnected from the supply voltage while one or more branches are connected to the supply voltage. With this arrangement, the stator resistance increases during starting, so that the starting current decreases accordingly.
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