Choice of an electrical drive depends on a number of factors. Some of the important factors are:

1. Steady state operation requirements: Nature of speed torque characteristics, speed regulation, speed range, efficiency, duty cycle, quadrants of operation, speed fluctuations if any, ratings.

2. Transient operation requirement: Values of acceleration and deceleration, starting, braking and reversing performance.

3. Requirements related to the source: Type of source and its capacity, magnitude of voltage, voltage fluctuation, power factor, harmonics and their effect on other loads, ability to accept regenerated power.

4. Capital and running cost, maintenance requirement and life of operation.

5. Space and weight restriction if any.

6. Environment and location.

7. Reliability.