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Proterra EcoRide Battery-Electric Transit Bus Uses UQM PowerPhase 150 System

A battery-electric version of Proterra’s 35-foot transit bus (earlier post)—the EcoRide BE35—is equipped with a UQM PowerPhase 150 propulsion system. The BE35 is being showcased on a four-city California clean bus tour which began in San Jose on 6 February.

The 35-foot EcoRide transit bus seats 37 passengers and features a lightweight composite body. The PowerPhase 150 electric propulsion system produces peak torque of 650 Nm (479 lb-ft) and peak power of 150 kW (201 hp). The system has a continuous torque rating of 400 Nm (295 lb-ft) and a continuous power rating of 100 kW (134 hp). The system also features optimized four-quadrant performance, dynamic torque, speed and voltage control, regenerative braking and system energy efficiency of over 90% across substantially all of its performance regime.

The BE35 also features:

  • A TerraVolt Energy Storage System, incorporating a Li-ion pack from Altairnano, with battery management system;

  • Flexible ProDrive and vehicle control system that can operate in battery-electric mode or with any small auxiliary power unit (APU) to extend vehicle range when needed;

  • All-electric components optimized through vehicle management systems to reduce energy usage throughout the vehicle’s operating cycle; and

  • Regenerative braking system utilizing the UQM PowerPhase 150 that enables the EcoRide BE35 to recapture over 90% of the vehicle’s kinetic energy available during braking.

Proterra has also developed a hydrogen fuel cell variant—the HFC35—which will be put into service in Burbank, California in Spring 2009.


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