公开(公告)号：DE19983505T1

公开(公告)日：2001-07-12

申请号：DE19983505

申请日：1999-04-29

Applicant: BRISTOL COMPRESSORS

Inventor： TOLBERT JUN JOHN W ,  YOUNG MICHAEL R ,  MONK DAVID T ,  LOPRETE JOSEPH F

IPC: B60H1/00 ,  H02P25/04 ,  H02P7/622

Abstract: An electrical control system for an induction motor for achieving optimum efficiency at both full and partial loads at markedly reduced electrical components costs while maximizing reliability over the range of load, and for achieving a two step motor power output in a greatly simplified manner, the circuit having an electrical induction motor adapted for connection to line electrical power at maximum motor operating frequency, and to a second source of electrical power at approximately one half of the maximum operating frequency, wherein an electrical switch is provided for selectively connecting each power source to the motor, wherein the second source is a reduced frequency wave form generator for producing a reduced frequency wave form.