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HEATINC VENTILAtlNC AIR CONDITIONING GUIDE 1944 Table 1. Classification of Motors Speed CharacTERISTICS ' Full Voltage l----------------- Torque Curhrnt Hp Range ' 4 Type of Application See Footnote* 1. Shunt Direct 2. Compound 3. Series Constant Speed Drives I Normal j All Constant Normal Constant or Variable High Variable. High Normal All Normal Small (ff) Fans and (c) centrifugal pumps and centrifugal compressors (&) (fi) (e) Redprocat ing pump9 and frequent or hand starting (d) Fans direct con nected 4. Squirrel-Cage Constant General Purpose Normal Torque Normal' 0.8-1.5. : times - High 6-8 times AU 5. Squirrel-Cage Constant Normal Torque Normal 0.8-1.5 times Normal Medium 5-6`times Small 6. Squirrel-Cage High Torque Poly phase 7. Wound Rotor 8. Synchronous High Speed. Constant High 2-2.6 times. Normal Medium 5-6 times Small Constant High ' or 1-2.5 Variable times Low 1--3 times with sec ondary control AU Constant Normal 0.75-1.75 times ' Normal Medium 5-7 times ~ Large 9. Synchronous Low Speed Constant Lew 0.3-0.4 times Low Medium 3--4 times Large (a) Fans and (c) centrifugal pumps and centrifugal compressors (a) Fans and centri-- fugal pumps and centrifugal com pressors (5) Reciprocating pumps () and compressors started loaded <p) Hoists (5) reciprocating., pumps and com pressors (e) and frequent (*)-or hand start (a) Fans and cen trifugal pumps and centrifugal com pressors (a) Reciprocating compressors .start ing unloaded. Single phase 10. Capacitor L Capacitor Fan ^Applications:. Constant. Constant High / . Normal Normal Small - Normal . Small ' [6) Pumps.and compressors iff) Fans, centrifugal pumps a. Drives having medium or low starting torque and Inertia (FFi?*) 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. accec.leSraitminiglatrotroqu(ea.) except where frequent or hand starting (large WR*) requires a higher starting and d. Fans direct connected. '' Stoker drives. 674 Current CHAPTER 36. MOTORS AND MOTOR CONTROLS Table 1. Classification of Motors--(Concluded) ------------------------------------- - Type Full Voltage' Charac teristics Starting Torque Starting Current Hr . Range Type op See Footnote* 12. Capacitor Start Constant High Induction Run Single 13. Repulsion phase Induction Constant High 14. Split. Phase - Constant and Adjust able Normal Normal Normal Normal SraaU () Fans Fractional () pumps and compressors Medium Small (a) Fans (p) pumps and compressors Fractional () Fans () pumps and compressors (d) fans--direct Adjustable Speed Drives Direct 15.. Shunt Field Adjustment Constant 16. Shunt Armature . Variable Resistor 17. Variable Voltage Variable Control formal formal Normal 'formal formal Normal &11 AU AU a) Fans and (e) centrifugal pumps a) Fans and V) centrifugal pumps (d) Fans and . centrifugal pumps PHASE 18. Squirrel-Cage . High Slip. Transformer Adjustment Variable 19. Squirrel-Cage Constant Separate Wind- Multi- ing or Regrouped Speed Pols 20. Wound Rotor, External Secondary Resistance Variable Normal Normal or High High Normal Normal or Low Low. Medium SmaU AU AU (o) Fans () Fans () pumps and (c) compressors (6) centrifugal pumps and compressors 21. Repulsion Variable Hlgfi Phase ?*>, Capacitor Low Torque Tapped Winding 23. Capacitor Low Torque Trans former Adjust ment Variable Two Speed Variable 24. Sollt Phase Constant Regrouped Poles Low .Low Normal Normal Normal Low Normal Low and () Fans--centrifugal Fractional pumps () compressors Fractional (d) Fans, direct Fractional (d) Fans Fractional (d) Fans 675