Electric vehicle drive system

The present invention relates to electric drive systems for use in electric vehicles, tractors, etc . . . and, more particularly, to an improved electric motor and driver system that includes a unique stator construction which provides on-command variable torque control at any constant revolution per minute ("RPM") and, thereby, improves motor efficiency that results from reduced power consumption and increased vehicle mileage. An electric drive system is provided to generate varying amounts of output torque supplied to a driven member over a wide range of constant revolutions per minute speeds to reduce power consumption. The electric motor includes a rotor and a stator assembly. The stator assembly is disposed around the rotor and is inductively coupled to the rotor. The stator assembly further includes a plurality of poles, each pole consisting of a plurality of split windings wound so that the magnetic fluxes generated therefrom are added. Power switching circuits are provided for energizing the partition drives of split windings on each of the stator poles. A controller is used to selectively control the frequency, pulse width modulation, and partition configuration to vary the rotational speed and torque generation supplied to the driven member.