EV drivetrain inverter with V/HZ optimization

Details EV drivetrain inverter with V/HZ optimization EV drivetrain inverter with V/HZ optimization

1984-10-16

1986-05-20

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318811, H02P 540

Patent

active

045904138

ABSTRACT:
An inverter (34) which provides power to an A.C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A.C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A.C. machine is optimized. The control circuit includes a micro-computer which calculates optimized machine control data signals from various parametric inputs and during steady state load conditions, seeks a best V/HZ ratio to minimize battery current drawn (system losses) from a D.C. power source (32). In the preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack and a three-phase induction motor (18).

REFERENCES:
patent: 3723840 (1973-03-01), Opal et al.
patent: 3819992 (1974-06-01), Opal et al.
patent: 3983463 (1976-09-01), Nabae et al.
patent: 3986088 (1976-10-01), Zankl et al.
patent: 4039909 (1977-08-01), Baker
patent: 4158163 (1979-06-01), Eriksen et al.
patent: 4276505 (1981-06-01), Bose
Toth, A., "Energy Savings in an Induction Motor Using the 8022 Microcontroller", Intel AP-94.
Eisenhaure et al., "A High Efficiency Controlled Slip Induction Motor Drive for Electrical Vehicles", Conference: Proceedings of the 14th Intersociety Energy Conversion Engineering Conference, Boston, MA, USA, (Aug. 5-10, 1979).

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