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The second electric direct-drive synchronous traction system introduced in September of 2003, ideally suited for  heavy trucks and buses.  This system, which was originally intended for the Roll-on/Roll-off tractor and/or Container Transporter currently under development, was first tested on the Whisper® 1. Whereas the system performed as planned, the energy efficiency disappointed (see: Whisper® 1), because the systems were grossly oversized, overweight, and underused in this particular application. Furthermore, in the absence of suitable tires, a modified low-pressure tractor tire was being used that severely impacted the rolling resistance.

A de-rated version, which will bear the identification TheWheel™ SM700/2, is currently being finalized with a 33% reduction in key performance parameters while maintaining the same diameter.

TheWheel™ SM700/3AL (second generation) - Click on image to enlarge

 

Rear view with rim (Click on image for AutoCAD Download)

Rear view without rim (Click on image for AutoCAD Download)

 

Performance Comparison of the Product Range:

Five wheel hub direct drive units have been designed and three have thus far been extensively tested in both aluminum and steel versions: they are the SM500/1, SM500/2 and SM700/3. The first non wheel hub version of this direct drive system is the SM350/1. For a detailed comparison of the individual systems click on the table below for an enlarged version of the table as a PDF image.

Click on any chart below for a PFD version of all three combined:

Key Benefits

  • Simple installation with a DIN B5 flange of 250mm.
  • Cabling harness reduced to only 2 main current cables +/-.
  • Communication connection with InterControl or similar programmable logic controler through fiber optic or CAT5 data cable.
  • Absence of traction components gives more freedom "within" the vehicle.
  • Reduced overall weight.
  • Absence of a gear box eliminates "empty torque necessity", with a drastic reduction of rolling resistance of up to 50% saving in energy.
  • Between 89 and 96% energy efficiency.
  • Three high quality ball bearings eliminate the need for maintenance.
  • Extremely quiet.
  • Regeneration of energy during braking action which is stored in the Lithium-Ion traction batteries.
  • Traction Control, Anti Block System en Anti Rollback, Dynamic Hand brake.
  • Solid-state brakes, using magnetic forces, eliminate wear and tear of the braking system.
  • Shaft permits attachment of hydraulic disk brake system.
  • The electronic package is divided in 3 independent (failsafe) modules for each wheel.
  • TheWheel™ can easily be maintained from outside the vehicle.
  • TheWheel™, unlike other electric traction motors, can easily be removed for rarely needed scheduled maintenance.
  • No EMC radiation, because it is locked up inside the system and the controller is connected to the motor in the shortest possible way.  The power DC cables coming out of the system can also easily be shielded.
  • No magnetic radiation as the magnetic flux is guided inside the metal housing of the system. 
  • A continuously four-quadrant controlling of TheWheel™ per phase delivers the highest degree of safety.

 

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Last modified: April 28, 2009