Abstract

Summarizing the characteristics of these drives with respect to wind tunnel research requirements, we have the following: Range in which speeds can be regulated Slip regulator?40 to 97 per cent. Clymer drive?Any speed from 1 to 96 per cent. Effect of load on speed regulation Slip regulator?Loads must be predetermined for all speeds. Clymer drive?Can be set at any desired speed for any load within the rating of the machine. The control is independent of the load. Effect of temperature, frequency, and voltage variation Slip regulator?Speed regulation is affected by both temperature and fluctuation in frequency. Clymer drive?Speed is completely controllable under temperature and frequency variations and is independent of voltage fluctuations. Slip energy Slip regulator?Energy wasted in heat dissipation. Clymer drive?85 per cent of slip energy returned to the supply circuit.

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