Lightweight Electric/Hybrid Vehicle Design

Current EV design approaches 27
under the vehicle either in place of or in addition to the conventional power train. No gearbox is
needed and the motor provides nearly 300 Nm of torque directly. The following specification
applies for a 45 kW Motorpak:
Input 50–240 V AC, 40–65 Hz single or 3 phase up to 30 A; recharge time 3
hours
Output 0–220 V, 3 phase up to 750 Hz 60 kVA, 13.6 V DC 500 W
Batteries 18 off, 12 V, 60 Ah sealed lead–acid units, may be configured as 108
or 216 V unit
Weight 800 lb (362 kg)
Dimensions 30 in long, 27 in wide, 14 in high
Construction Weatherproof
Controls Function switch, accelerator pedal, voltmeter/ammeter/amp hour meter,
13.6 V for auxiliaries, 2 oil pipes to motor (4 litres/min)
Deep discharge 800 cycles to 80%
performance
Stored energy 10 kWh
Cost in 1991 £3000 at 1000 off ex batteries (£5000 with batteries), price includes
motor
Temp. range −20°C to + 40°C
45 kW traction motor
Type Brushless DC permanent magnet
Size 375 long × 250 diameter, weight 50 kg
REMOVE
Engine
Gearbox
Cooling system
Fuel tank
BATTERIES/PCU
800 LBS
Fig. 1.25 Motorpak concept.
MOTOR
120 LBS
ADD
Motorpak unit
Motor
Vacuum pump for brake servo
Optional air conditioner / heater
ACCELERATOR
CONTROL
SWITCH
A
AMMETER
I VOLTMETER
I AMPERE HOUR METER
BATTERY/PCU
POWER
LP RETURN OIL
HIGH
PRESSURE
MOTOR
OIL
COOLING TO
12 V TO BATTERY
MOTOR
POWER
STEERING SERVO
POWER
TO
DIFFERENTIAL