Design and Performance of Electrical Propulsion System of Extended Range Electric Vehicle (EREV) Chevrolet Volt


This paper presents the look and performance details of the Chevrolet Volt electrical propulsion system. The propulsion system has two machines: One machine is operating largely as a motor whereas the opposite machine is working largely as a generator. Both machines of the Volt electrical drive system are permanent-magnet ac synchronous machine varieties with the magnets buried within the rotor. The motor has distributed windings. But, as opposed to a conventional stranded winding, the Chevrolet Volt motor has bar-wound construction to boost the motor performance, notably within the low to medium speed range. At higher speed, the skin and proximity effects within the stator bars lead to increased stator winding losses but are addressed in the design. The bar-wound construction additionally has glorious thermal performance, in both the steady-state and transient conditions, necessary for full electrical vehicle (EV) driving. The generator uses focused windings. The focused winding construction has smart slot fill and short end-turn length. These features resulted in sensible performance in the meant operational region and were an enabler for machine packaging inside the transmission. Each the machines exhibit glorious potency and exceptionally smooth and quiet operation. The machine style and construction details, further as the measured thermal, electromagnetic, and acoustic noise performances, are presented in this paper.

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