Electric vehicle drive system

An electric motor for generating varying amounts of output torque supplied to a driven member at any constant revolution per minute speed for reducing power consumption on the power source, comprising:

• a rotor having an axis of rotation;
• a stator assembly disposed around said rotor and being inductively coupled to said rotor;
• said stator assembly having a plurality of stator phases;
• said stator phase having a plurality of stator poles;
• each of said stator poles having a plurality of split windings, each of said split windings being wound such that the magnetic flux generated in all said plurality of split windings will add to produce an increased magnetic field strength;
• each of said plurality of split windings within each of said plurality of stator poles being wired into an electrical configuration with associated split windings of similar stator poles for forming a plurality of partitioned drive circuits;
• controller means being coupled to each of said plurality of partitioned drive circuits for varying the duty cycle of voltage pulses defining a pulse-width modulated waveform;
• each of said plurality of partitioned drives circuits forming a plurality of transistors connected in an H-bridge network across a power source, said plurality of transistors being turned on and off for producing said voltage pulses with alternating polarity and predetermined width;
• the plurality of partitioned drives having independent power source input terminals, each of said power source input terminals of each partitioned drive having independently controlled direct current switching circuits;
• each of said controlled switching circuits being configured for allowing each of said partitioned drives to be switched into parallel or series combinations with the other of said partitioned drives for regulating the effective number of turns per coil of said stator for increased efficiency based upon the output torque generated from said electric motor.

An electric motor for generating varying amounts of output torque supplied to a driven member at any constant revolution per minute speed for reducing power consumption on the power source, comprising:

• a rotor having an axis of rotation;
• a stator assembly disposed around said rotor and being inductively coupled to said rotor;
• said stator assembly having three stator phases;
• said stator phase having four stator poles;
• each of said stator poles having three split windings, each of said split windings being wound such that the magnetic flux generated in all said split windings will add to produce an increased magnetic field strength;
• each of said split windings within each of said stator poles being wired into an electrical configuration with associated split windings of similar stator poles for forming three partitioned drive circuits;
• an inverter controller coupled to each of said partitioned drive circuits for varying the duty cycle of voltage pulses defining a pulse-width modulated waveform;
• each of said partitioned drives circuits forming a plurality of transistors connected in an H-bridge network across a battery source, said plurality of transistors being turned on and off for producing said voltage pulses with alternating polarity and predetermined width;
• the three partitioned drives having independent power source input terminals, each of said power source input terminals of each partitioned drive having six independently controlled direct current switching circuits;
• each of said controlled switching circuits being configured for allowing each of said partitioned drives to be switched into parallel or series combinations with the other of said partitioned drives for regulating the effective number of turns per coil of said stator for increased efficiency based upon the output torque generated from said electric motor.