Winners Shell Eco Marathon | Direct Drive Traction Motor

This high efficiency traction motor was developed for the Hydro Cruisers team that entered and won the 2011 Shell Eco-marathon race. Based on Magnetic Innovations frameless torque motors the design was optimized for the specific working conditions of the customers vehicle during the race. This design optimization led to custom specific magnet and lamination grade selection as well as optimizing motor length and customized windings. With this customized design a proven efficiency of >90% was realized.

Mechanically the motor was engineered with integral ball bearings and to interface with a resolver for position feedback.

Application areas:

  • Vehicle propulsion
  • Power generation
  • Servo motors

Key features:

  • High torque density
  • High efficiency
  • High reliability and lifetime
  • Maintenance free
  • Quiet operation

Technical Data

Model MI  1103 001

Parameter [unit]


OD x L [mm]

113 x 45


Max Shaft OD [mm]


Torque constant [Nm/Apk]


Back EMF constant [Vpk/rad/s]


Rated power [W]


Rated torque [Nm]


Phase resistance [Ω]


Phase inductance [mH]