Dual Purpose Drive

The TM10e2 Dual Purpose (DP) Drive is the ideal solution for modernization projects where the user wishes to upgrade from a legacy DC system to a modern AC system. The TMdrive-10e2 Dual Purpose drive is capable of controlling either a DC or AC motor. This capability allows for flexibility in planning system modernizations in a manner that accommodates constraints created by operating demands and budgetary considerations. New AC motors can be powered and controlled using TM10e2 DP drives with AC motor control firmware installed. DC motors can be powered and controlled using TM10e2 DP drives with DC motor control firmware installed. DC Motors can be replaced at any time with AC motors and powered by the previously installed TM10e2 DP drives.

tmdrive-10e2dp slideoutThe Dual Purpose drive uses standard TMdrive-10e2 drive power and control hardware for both AC and DC motor control. When DC motors are upgraded to AC, the drive can be reconfigured for AC motor control by switching the firmware from the DC to the AC motor control function set. The drive can then be quickly re-tuned to achieve the required operational performance.


DC and AC motors have different physical and electrical requirements. In addition to the standard TMdrive-10e2 AC drive, an auxiliary panel with both armature and field circuit filters is required for the DC motor, shown in the figure below.

TMdrive-10e2 Converter DC Source for all AC and DC Drives

Features and Benefits

  • Standard TMdrive-10e2 uses IGBT gating with Pulse Width Modulation
  • Four quadrant regenerative operation from DC armature
  • Non-reversing, non-plugging field power
  • Standard TMdrive-10e2 converter DC source used for all AC and DC drives
  • Converter operates with reduced harmonics and unity power factor for reduced impact on the plant power system

TMdrive-10e2 DP Drive Ratings

When applying the TMdrive-10e2 Dual Purpose Drive as DC motor control, the AC KW capability is de-rated. The extra capacity becomes available again when the DC machine is upgraded to AC, allowing for a potential power increase based on process requirements. For the example shown here, the Frame 100 applied as a DC drive produces 32.3 KW. Applied as an AC drive the Frame 100 can produce up to 82.4 KW.

    500 V DC Motor 150% OL 460 V AC Motor 150% OL
Frame DC Bus Voltage Max Current Rating Motor KW AC Current Rating Motor KW
15 680 11.5 5.5 18.0 11.6
30 680 22.5 10.7 35.0 22.5
60 680 47.5 22.6 75.0 48.3
100 680 68.0 32.3 128 82.4
150 680 102 48.5 204 131
250 680 161 76.5 270 174
400 680 252 120 455 293
600 680 417 198 700 450
750 680 520 247 935 602
900 680 640 304 1150 740


Comparison between Thyristor and IGBT Systems

The TMdrive-10e2-DP IGBT gating reduces armature RMS current ripple more than 3:1 compared to traditional 6-pulse thyristor drives. Reduced RMS ripple results in lower motor heating and better commutation. Legacy DC drive systems operate at a Power Factor (PF) between approximately 0 and 0.8 lagging with appropriately sized infrastructure. The TMdrive-P10e2 regenerative converter operates at 1.0 PF with smaller cables and transformer requirements, higher efficiency and lower utility costs. If the existing utility infrastructure is marginal, it will be more robust after upgrading with the Dual Purpose Drive system.

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