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Compact, High

Efficiency Electric

Drive System

Latest off-highway electric drive

transmission technology co-presented by

Oerlikon Fairfield at 2016 VDI International


Oerlikon Fairfiel

d co-presented details of an innovative

electric drive system for off-highway vehicles at the re-


VDI International Congress

in Germany.

The system integrates an Oerlikon Fairfield Torque

Hub planetary drive with an Interior Permanent Magnet

Motor produced by

Ashwoods Electrical Motors

, to

create an ultra-compact drive solution that is up to 70%

smaller and lighter and 20% more efficient than tradi-

tional motors used in off-highway traction


Gunnar Stein, Chief Technical Officer of Oerlikon’s

Drive Systems Segment explained:

“The improved efficiency, small package size and

competitive cost of this integrated solution sets

a new benchmark for electric drives in the off-

highway sector.”

The unit is so compact that it enables ve-

hicle manufacturers to provide a steerable four-

wheel-drive configuration where previously there

was not enough space to offer this possibility.”

The complete unit can deliver 4,000 Nm of drive

torque and 5,600 Nm of braking torque, yet the motor

is up to 70% smaller and lighter than current production

solutions that use larger, less efficient brushed DC or

induction motors coupled to a planetary gearbox.

The Oerlikon Fairfield/Ashwoods Electric Motors

solution provides a triple planetary ratio in the length

of the standard double planetary design.

Combining the two technologies with an integrat-

ed Ultra electric parking brake has enabled the elimina-

tion of several duplicated or redundant components;

for example, a common shaft is used for motor, brake

and transmission. This approach saves weight, cost and

package space.

The Oerlikon Fairfield Torque-Hub® planetary drive

is already well-proven and widely used in offhighway

vehicles and is available in single planetary, double plan-

etary, triple planetary and differential planetary gearing

configurations to meet the individual torque and oper-

ating speed requirements of different applications.

Dynamometer testing of the new drive system has

been completed and durability tests are in progress;

vehicle-based testing began at the end of June 2016.

Oerlikon Fairfield

Ashwoods Electrical Motors

Contractors World International

Contractors World International Vol 7 No 4