Description

Traction electric drives based on the iEM-IIw-1500 module with liquid cooling have high specific power characteristics and allow realizing a highly efficient and reliable direct drive system for each drive wheel. The choice of the number of iEM-IIw-1500 modules in each electric drive from 1 to 3 pieces provides the ability to scale the drive power for driving wheels of both purely electric and hybrid freight and passenger vehicles (TC).

Graphs of the dependence of power and torque on the speed of the iEM electric motor when the number of modules in the electric drive changes from 1 to 3 pieces, where N is the rated speed, Mnom is the rated torque, Pnom is the rated power

Electric drives of the rear axle of an electric bus or a cargo vehicle based on single-module electric motors iEM-IIw-1500

Modern synchronous drives of the iEM-IIw series open up for the developers of electric transport the prospect of creating modern passenger and freight electric vehicles with direct drive on two or more driving wheels and using an electronic differential instead of a mechanical one:

The main disadvantages of a classic mechanical car transmission are excessive weight and complexity of the system, as well as limited reliability and resource. The transition to efficient synchronous electric drives of the iEM-IIw series provides not only a radical simplification and reduction of the vehicle chassis weight, but also significantly improves the vehicle’s energy performance, including impressive acceleration dynamics, efficient braking energy recovery and new possibilities for vehicle motion control.

Comparison of classic geared and direct-drive transmissions of electric vehicles

In the electronic braking mode, the iEM-IIw-1500 electric motor is transferred to the generator mode, providing efficient regeneration of braking energy and recharging the vehicle batteries.

Key advantages of electric vehicles built on the basis of iEM-IIw-1500 traction drives:

• high efficiency (> 94%) and the absence of overcurrents during acceleration ensure a 25-50% reduction in power consumption compared to classic asynchronous electric drives with a gearbox;
• constant high torque in the range of revolutions from 0 to rated;
• small dimensions and weight: 4-5 times smaller and lighter than classic asynchronous drives;
• 3-4 times smaller dimensions and weight, which provides a significant reduction in the weight of the vehicle transmission (TC);
• high reliability due to the absence of a gearbox, simplified transmission and the possibility of modular duplication;
• efficient energy recovery in the vehicle electronic braking mode;
• low costs for periodic maintenance, long service intervals.