Document nkeYLnB3Y3JJO5XGbXx10DZw2

HEATINC VENTILATING AIR CONDITIONING CUIDE 1940 CUBRENT Table 1. Classification of Motors type Speed Charac teristic!} Full Voltage Starting Torque Starting Current Hp Range Ttpb OP Application See Footnote* 1. Shunt Direct 2. Compound 3. Series Constant Speed Drives Constant Medium Medium All Constant Tigh Dr Variable Variable High Vledium Ml Vledium Small a) Fans and c) Centrifugal 5umps (c) (e) Recipro:ating Pumps and freijuentorhand starting [d) Fans direct connected Poly phase 4. Squirrel Cage Constant Normal General Purpose High All 6-8 Times (o) Fans and (c) Centrifugal Pumps 5. Squirrel Cage Constant Normal Medium Torque 6. Squirrel Cage. Constant High High Torque Medium Medium (o) Fans and 5-6 Times Small Centrifugal Pumps Medium Medium (ft) Reciprocating 5-6 Times Small Pumps (e) and Compressors started loaded 7. Automatic Start Constant High High Torque Low 3 Times Medium (ft) Reciprocating Pumps (e) and Compressors started loaded 8. Slip Ring Wound Rotor 9. Synchronous High Speed 10. Synchronous Low Speed Constant High Low All ' 1-3 Times with sec ondary control () and Hoists () Reciprocating Pumps (c) and Frequent (e) or Hand Start Constant Medium Medium Medium 5-7 Timess Large (a) Fans and Cen trifugal Pumps Constant Low Low Medium (a) Reciprocating 3-4 Time.> Large Compressors start ing unloaded Single phase 11. Capacitor Constant High Normal Medium (6) Pumps and Small Compressors v a. Drives having medium or low starting torque and inertia (PFR*) such as fans and centrifugal pumps or reciDprroivceastinhgavpiunmg phsigahnsdtacortminpgretsosroqrusesst,asrtuecdh uansloraedceipdr.ocating pumps and compressors started loaded. c. Similar to (<*) except where frequent or hand starting (large WR*) requires a higher starting and accelerating torque.' d. Fans direct connected. e. Stoker drives. 674 CHAPTER 39. MOTORS AND CONTROLS Current Table 1. Classification of Motors--(Continued) TYPE Speed Charac teristics Full Voltage Starting Torque Starting Current I j Hp Range 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 Induction Run 15. Repulsion Induction 16. Repulsion Start Induction Run 17. Split Phase Constant Any Constant High Constant High Constant Medium and Adjusttable Medium Medium () Fans Small () Pumps and Compressors Medium Medium (a) Fans Small (A) Pumps and Compressors Medium Medium (a) Fans Small (ft) Pumps and Compressors Medium Frac tional (a) Fans (A) Pumps and Compressors Adjustable Speed Drives Direct 18. Shunt Field Adjustment Constant Medium Medium All 19. Shunt Armature Variable Resistor Vledium Medium All [a) Fans and [e) Centrifugal Pumps 'a) Fans and fi) Centrifugal ?umps Poly phase 20. Squirrel Cage Variable High Slip, Tapped Winding Medium Medium Medium Small a) Fans 21. Squirrel Cage 1Variable High Slip, Trans former Adjust ment Medium Medium Medium <small a) Fans 5'2. Squirrel Cage < 'onstant 1 Medium ] -X)W Separate Wind- ] Multi- c r High ingor Regrouped 5Speed Poles iMl a) Fans ft) Pumps and c) Compressors 675