AC induction motor and method of starting same
AssigneeEaton Corporation
InventorsEric So, Steven Christopher Birch, Guy John Middleton
Life of this patent
Estimating the term…
Abstract
An AC induction motor has separate start and run windings radially separated in slots in the stator laminations. The start windings are arranged in the radially outer portions of the slots to aid heat dissipation and to increase the flux linkage so as to reduce inrush current during starting. The motor is started by switching on the start windings initially, and switching on the run windings in phase with the start windings when the motor reaches its running speed, but before switching off the start windings. In this way, the surge current during switching between the start and run windings is reduced.
Claims10
A stator for an AC induction motor, including a set of start windings and a set of run windings switchable from the set of start windings, wherein the set of start windings is radially offset from, and has the same phase arrangement as, the set of run windings, the set of start windings and the set of run windings pass through common radially extending slots in the stator, the start windings occupying a radially outer position in the common slots relative to the set of run windings.
Dependencies are inferred from the claim text.