Patent ID: 6091218
Filing Date: 2000-07-18
Classification: H02P

Abstract:
Apparatus for conserving power supplied to a multi-phase motor used to power a load which may vary, said load having a load line providing an indication of a magnitude of said load, said motor having a plurality of voltage input lines for connection to receive a multi-phase input voltage comprising:a monitor for connection to monitor a parameter of said load line;a plurality of voltage limiting circuits in respective ones of said voltage input lines, said voltage limiting circuits limiting a voltage on said input lines to below selectable voltage levels in response to a control signal; anda control circuit connected to said monitor having a plurality of discrete programmed output levels to provide the control signal to said voltage limiting circuits, each output level corresponding to a range of said parameter values of said load line, whereby said voltage limiting circuit limits the input voltage to the load to one of said selectable voltage levels corresponding to said parameter range monitored on said load output line.