SRI 300 series

Compact and efficient

Dana TM4’s has for over 30 years provided high reliability and high efficiency motors for a wide range of low-voltage applications, being the first in the market to introduce low-voltage SRI Motors. The SRI technology is a hybrid technology, where most of the Torque provided (typ. 70%+) comes from the SR part, while a small(er) amount of magnets (IPM) provide the rest. This way it is possible to get the best of two worlds: The efficiency level of a PMAC motor combined with the ruggedness, and, to a large extent, the lower production cost of SR motors. All while offering a superior speed / torque range than any other low-voltage motor technology.


  • SRI motor
  • Applicable for traction, pump and other applications for large machines
  • Efficiency of an IPM motor and versatility of an SR motor
  • Up to 30% more torque & up to 30% more nom. power output in the footprint of same size ASY 200 motors
  • > 60% more power & torque output in the field-weakening area
  • Close to ACIM or SR motor overload / thermal capacity with low loss design
  • Superior speed & torque range / Max. speed to nom. speed ratio of up to 6.
  • Insignificant cogging torque
  • Optimized cost / benefit ratio with small amount of magnet material used
  • Seamless integration with low-voltage inverter product lines.
  • Mechanical Interfaces for traction and pump available
SRI 300
Voltage (V)48-144
Peak power (kW)30-70
Continuous power (kW)20-60
Operating speed (RPM)0-6000
Peak torque (Nm)300-700
Continuous torque (Nm)130-250