By Ron Hodkinson
Light-weight Electric/Hybrid car layout, covers the actual car layout process required for hybrid/electrical force autos. there's at the moment large funding world-wide in electrical car propulsion, pushed via situation for pollutants regulate and depleting oil assets. The significantly varied layout calls for of those new cars calls for a very new process that's coated comprehensively during this book.The booklet explores the relatively dramatic departures in structural configuration useful for purpose-designed electrical car together with weight elimination within the mechanical platforms. It additionally presents a accomplished assessment of the layout method within the electrical hybrid force and effort garage systems.Ideal for car engineering scholars and pros light-weight Electric/Hybrid car layout presents a whole advent to this crucial new zone of the industry.comprehensive assurance of all layout points of electric/hybrid vehicles in one volumepacked with case experiences and applicationsin-depth therapy written in a textual content e-book variety (rather than a theoretical professional textual content type)
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Extra info for Lightweight Electric/Hybrid Vehicle Design
Example text
A consequence of using a 300 V battery is that the rail voltage will vary from 250 to 400 V under different service conditions. (b) (a) IM Brushless DC Motor Fig. 22 (a) Single bridge inverter, (b) double chopper inverter. 1 25 BATTERY CONSIDERATIONS A good commercial battery for deep discharge work is the Trojan 220 Ah 6 V golf cart unit. This gives 75 A for 75 mins and weighs 65 lb, consequently a 108 V stack weighs 1170 lb and cost $1080 in 1991. It also requires considerable maintenance and occupies a projected area of 1342 square inches and is 10 5/8 inches high.
This solution offers a driveline efficiency of 90%. However, we need a machine to give constant power from 700 to 1500 rpm. 5 bhp at 40 km/h and 5 bhp at 60 km/h. Vital in achieving good rolling resistance figures is to use large diameter tyres of, say, 24 inches. CONSTANT T CONSTANT P 50 40 POWER (kW) 90% 30 89% 87% 20 85% 10 82% 1000 2000 SPEED (RPM) Fig. 16 Switched reluctance motor. pm6 18 21-04-01, 1:40 PM 3000 Current EV design approaches 19 It is assumed that sealed batteries are to be used and consequently a battery voltage of 96 V was chosen to optimize the efficiency of motor and controller and particularly with an eye to controller cost.
All the machines deliver constant power (20 kW) over a 4:1 speed range, making gear changing unnecessary. The induction/brushless motors are assumed to use vector control. 5 192 122 DC 20 (equiv. ) 1000 95 97 oil 93 95 oil 94 96 oil 85 89 air (c) Speed (rpm) Torque (Nm) at speed (rpm) Torque (Nm) Voltage (V) Current (A) Power (kW) Frequency (Hz) Weight (kg) Efficiency % @ 1000 % @ 4000 Cooling Fig. 17 Motor comparisons for three vehicle categories (the four motor types are also discussed in Chapter 4).
