Document B8wVO7drjk7raGyer9VprOYpo

HEATINC VENTILATING AIR CONDITIONING GUIDE 1942 CURRENT Table 1. Classification of Motors Speed Ohara rv Txanmcs Full Voltage Starting Torque Starting Current Hp Range. Ttpb op Application Sbe Footnote* 1. Shunt Direct 2. Compound 3. Series Constant Speed Drives Constant Medium Medium All Constant High or Variable Variable High Medium All Medium Small (a) Fans and (c) Centrifugal Pumps V>) (e) (e) Recipro cating Pumps and fre quent or handstarting (d) Fans direct connected Poly phase 4. Squirrel Cage Constant Normal High , All General Purpose 6-8 Times (o) Fans and (e) Centrifugal Pumps 5. Squirrel Cage Constant Normal Medium Medium (a) Fans and Medium Torque 5-6 Times Small. Centrifugal Pumps 6. Squirrel Cage High Torque Constant High Medium Medium (4) Reciprocating 5-6 Times Small Pumps () and Compressors started loaded 7. Automatic Start Constant High High Torque Low 3 Times Medium (6) Reciprocating Pumps (e) and Compressors started loaded 8. Slip Ring Constant High Wound Rotor Low All 1 -3 Times with sec ondary control (a) and Hoists (4) Reciprocating Pumps (c) and Frequent (e) or Hand.Start 9. Synchronous ' High Speed Constant Medium Medium Medium (n) Fans and Cen 5-7 Times Large trifugal Pumps 10, Synchronous Low Speed Constant Low . Low Medium (a) Reciprocating 3r4 Times Large Compressors start ing unloaded Single phase 11. Capacitor Constant High Normal Medium (6) Pumps and Small Compressors *Applications: ' , a. Drives having medium or low starting torque and inertia (FF*) such as fans and centrifugal pumps or reciprocating pumps and compressors started unloaded'. . . b. Drives having high starting torques, such as reciprocating pumps and compressors started loaded. c. Similar to (a) except where frequent or hand starting (large WR?) requires a higher starting and accelerating torque. d. Fans direct connected. . Stoker drives. 688 CHARTER 36. MOTORS AND MOTOR CONTROLS -- Cgbbsnt Table X. Classification of Motors--(Continued) Ttpb Chaea<> TERIETtCS Full Voltage Starting Torque Starting Current Hp Range Ttpb op Application See Footnote* Single phase 12. Capacitor Fan Constant High Medium Medium (a) Fans--belted Small 13. Capacitor Fan Constant Low Medium Medium (d) Fans--direct Small 14. Capacitor Start Constant Any Induction Run Medium Medium (a) Fans Small (b) Pumps and Compressors 15. Repulsion Induction Constant High Medium Medium () Fans Small () Pumps and Compressors 16. Repulsion Start Constant High Induction Run Medium Medium (a) Fans Small (5) Pumps and Compressors 17. Split Phase Constant Medium Medium Frac and tional Adjust able (a) Fans (4) Pumps and Compressors Adjustable Speed Drives 18. Shunt' Field Adjustment" Constant Medium Medium All Direct 19. Shunt Armature Variable Medium Medium All . Resistor (a) Fans and (e) Centrifugal Pumps (a) Fans arid " ' (e) Centrifugal Pumps ! . . . Poly phase 20! Squirrel Cage " Variable Medium Medium Medium (a) Fans' High Slip,' ; Small . Tapped Winding 21. Squirrel'Cage , Variable High Slip, Trans- ; former Adjust- ment Medium Medium Medium Small (a) Fans 22. Squirrel Cage Constant Medium Separate Wind- Multi- or High ' ing or Regrouped Speed Poles Low All (a) Fans (4) Pumps and (c) Compressors i 689