FAN SPEED CONTROL GOVERNOR FOR ALTERNATING-CURRENT LOCOMOTIVE Russian patent published in 2006 - IPC H02P27/04 H02M5/16 

FIELD: electrical engineering; ac consists.

SUBSTANCE: proposed device designed to control speed of fan driven by three-phase induction motor has traction transformer 1 with its primary winding 2 connected to supply mains 3, auxiliary winding 4 with terminal and intermediate leads, frequency converter built around two pairs of thyristors connected in parallel opposition, and control unit 9 whose outputs are connected to control inputs of thyristors. First pair of thyristors is connected to one terminal lead and second one, to other terminal lead of auxiliary winding. to terminal leads of auxiliary winding. Three-phase induction motor 10 is characterized in enhanced number of low-speed steps; its first phase lead is connected to loose lead of first pair of thyristors, its second phase lead, to loose lead of second pair of thyristors, and third phase lead, to intermediate lead of auxiliary winding.

EFFECT: enlarged range of fan capacity regulation by load current, reduced cost of locomotive auxiliary power.

1 cl, 1 dwg