EV drivetrain inverter with V/HZ optimization

Patent · Wed Jan 01 00:00:00 EST 1986

OSTI ID:865858

Gritter, David J ^[1]; O'Neil, Walter K ^[2]

---

1. Southfield, MI
2. Birmingham, MI

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).

• Assignee: Eaton Corporation (Cleveland, OH)
• Patent Number(s): US 4590413
• OSTI ID: 865858
• Country of Publication: United States
• Language: English

Related Subjects

drivetrain
inverter
hz
optimization
34
provides
power
machine
28
controlled
circuit
36
employing
pwm
control
strategy
whereby
supplied
preselectable
frequency
voltage
accomplished
technique
waveform
notching
shapes
notches
varied
determine
average
energy
content
overall
arrangement
operational
efficiency
optimized
micro-computer
calculates
data
signals
various
parametric
inputs
steady
load
conditions
seeks
ratio
minimize
battery
current
drawn
losses
source
32
preferred
embodiment
incorporated
electric
vehicle
10
144
vdc
pack
three-phase
induction
motor
18
control data
average energy
provides power
induction motor
control circuit
electric vehicle
power source
preferred embodiment
control strategy
data signals
data signal
energy content
pwm control
waveform notching
three-phase induction
strategy whereby
vdc battery
various parametric
load conditions
machine control
preselectable frequency
preselectable voltage
operational efficiency
parametric inputs
overall waveform
optimized machine
battery pack
employing pwm
selectable frequency
dc battery
current drawn
/318/