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Electrical Power and Hybrid Drive System for vehicles and mobile machines.
STW develops components for a hybrid drive system (powerMELA®) in cooperation with various partners. The system is used in agriculture, industrial and municipal machines to realise diesel-electric drives, and auxiliary power supply. The open electrical system can power on-board consumers and electrically driven attachments. Excess power is stored in a battery for later use or peak loads.
Hybrid drives and high-voltage power networks gain increasingly higher importance in the market sector of vehicles and mobile machines. An increasing need for more capable machines with higher comfort and safety is driving the adoption of this technology. The wish for higher automation requires increasing application of control and power electronics in vehicles and mobile machines. The innovation is driver further by increasing energy costs and strict environmental regulations.
Picture 1: Hybrid Drive powerMELA® and 750VDC on-board electrical system
The diesel engine powers the generator and generates 750V direct current voltage with the help of an integrated frequency converter. The required power is available through the open power network, which operates independently of engine speed. Compact electric motors are connected to the on-board power system. They power the wheels via the reduction gearbox and can be controlled online through CAN-bus communication There is a safety system built into the intermediate direct current network, which observes the high voltage system, and if there is insulation damage, overvoltage or under voltage and can shutdown the system.
High power attachments and on-board consumers can be independently controlled. With a network voltage of 750 V, high power can be transferred under low current and over small cross section cables.
The hybrid drive offers the opportunity to meet all customers’ performance and efficiency requirements, with the business advantage of a technological solution that stands out in a crowded market. Regulatory requirements on emissions and the related tax advantages are driving the market for hybrid vehicles.
Author:
Dietmar Schrägle
Project Manager for powerMELA® at STW
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powerMELA-C Datasheet (english)