High Efficiency All-Electric Vehicle Propulsion System
OwnerVladimir A. Shvartsmaninventor
Life of this patent
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Abstract
An all-electric vehicle propulsion system using a readily available high frequency AC Motor such as a 3-phase 400 Hz motor. A step-down gearbox increases torque and power thus decreasing the need for a high-power motor. Also, with the controllers of the invention, readily available, inexpensive batteries can be used as a primary source of energy. An efficient C&A-DC/DC step-up converter to power a high-efficiency motor driver can force the AC-motor windings circulate current in a resonance mode at around 220 volts. While 400 Hz and 220 volts are preferred, any voltage or frequency may be used, as well as any number of phases. Vehicle speed and torque can controlled by changing frequency and voltage applied to the motor usually using a variable resistor.
Claims19
An all-electric vehicle propulsion system comprising:
- a 400 Hz, 3-phase AC electric motor having three windings 120 electrical degrees out of phase;
- a high reduction ratio gearbox mechanically connecting said AC electric motor to a vehicle's wheels;
- a motor drive circuit delivering 400 Hz, 3-phase electrical current to said AC motor from a DC power supply;
- a 3-phase pulse generator electrically connected to said motor drive circuit delivering pulses shifted by 120 electrical degrees each said pulse having a duration of ¼ cycle;
- wherein each of said three windings of said AC electric motor has an associated capacitor, said capacitor being charged for ¼ cycle and then discharged through said winding in a manner that doubles voltage across said winding.
An all-electric vehicle propulsion system comprising:
- a 400 Hz, 3-phase AC electric motor having three windings 120 electrical degrees out of phase;
- a high reduction ratio gearbox mechanically connecting said AC electric motor to a vehicle's wheels;
- a motor drive circuit delivering 400 Hz, 3-phase electrical current to said AC motor from a DC power supply;
- a 3-phase pulse generator electrically connected to said motor drive circuit delivering pulses shifted by 120 electrical degrees, each said pulse having a duration of ¼ cycle;
- wherein each of said three windings has an associated capacitor, said capacitor being charged for ¼ cycle and then discharged through said winding in a manner that doubles voltage across said winding;
- a charge-and-add DC/DC converter that converts low voltage from a plurality of vehicle batteries to at least 220 volts DC, said at least 220 volts being used to charge a virtual battery containing a plurality of low-leakage capacitors;
- a variable resistor adapted to be mechanically coupled to an accelerator pedal on said vehicle, said variable resistor controlling frequency of said 3-phase pulse generator and output voltage of said DC/DC converter.
An electric vehicle propulsion system comprising, in combination:
- a three-phase electric motor;
- a capacitor on each phase winding of said electric motor that discharges into said phase winding;
- a DC-AC converter and driver electrically connected to said electric motor that converts DC current from at least one battery into 3-phase AC current configured so that each of said capacitors charges for approximately ¼ cycle of said AC current;
- wherein, said capacitors discharge through said windings in a manner that doubles AC voltage across said winding.
Dependencies are inferred from the claim text.