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1.发明授权Apparatus for progressive phase switching from wye to delta connection of three-phase motor 失效从WYE到三相电机三相连续相位切换的设备
公开(公告)号：US3624471A
公开(公告)日：1971-11-30
申请号：US3624471D
申请日：1970-04-22
Applicant: SMITH CORP A O
Inventor： JAPP LESLIE G , PHENIX JOHN F , SUTHERLAND ROBERT
CPC classification number: H02P1/32
Abstract: A three-phase motor has three phase windings connected in a wye configuration for starting. Contactors are progressively and in timed sequence actuated to connect the wye windings into a delta configuration by varying the winding connection with at least one winding energized at all times. A circuit provides timed switching by selectively opening and then closing related contacts to selectively disconnect and connect one or more windings according to a preselected sequence to the powerlines. The timed switching minimizes current transients and establishes a smooth transition. The control circuit includes an incomplete sequence current-sensing element to disconnect the control circuit and thereby the phase windings in response to a selected excessive or extended intermediate sequence operation.
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