Document J3OLqpyzjrmynGmBdV6kZRdJr

HEATINC: VENTILATING AIR CONDITIONING GUIDE 1943 i Table 1. Classification of Motors . Type Speed Charac teristics Full Voltage Starting Torque Starting Current Hp Range Type of Application See Footnote* Constant Speed Drives -1. Shunt Direct 2. Compound 3. Series Constant Normal Normal All Constant or . Variable High Variable High Normal All Normal Small (a) Fans and (c) centrifugal pumps and centrifugal .compressors (5) (c) (e) Reciprocat ing pumps and frequent or hand starting 00 Fans direct con nected Poly phase 4. Squirrel-Cage Constant General Purpose Normal Torque Normal 0.8-1.5 times High 6-8 times 5. Squirrel-Cage - Constant . Normal Normal Torque 0.8-1.5 times - Normal 5-6 times 6. Squirel-Cage High Torque Constant High 2-2.6 times Normal 5-6 times 7. Wound Rotor Constant- High or 1-2.5 Variable times Low T-3 times with sec ondary control 8. Synchronous Highspeed Constant Normal i Normal 0.75-1.75 ' 5-7 times times 9. Synchronous Low Speed Constant . Low 0.3-0.4 times Low 3-4 times \ All (a) Fans and (e) centrifugal pumps and centrifugal compressors Medium Small (a) Fans and centri fugal pumps and centrifugal com pressors Medium Small (5) Reciprocating pumps (e) and compressors started loaded All . (a) Hoists (b) reciprocating pumps and com pressors (c) and frequent () or hand start Medium Large (a) Fans and cen trifugal pumps and centrifugal com pressors Medium - (a) Reciprocating Large compressors start ing unloaded Single PHASE' TO. Capacitor 11. Capacitor Fan Constant High Normal . Small - Constant . Normal - Normal Small (6) Pumps and compressors (a) Fans, centrifugal pumps *Applications: a-. Drives having medium dr'Iow starting torQue and inertia (IF/?*) 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 (c) except where frequent or hand starting (large TFR*) requires a higher starting and accelerating torque. d. Fans direct connected. e. Stolcer drives. 690 Current CHAPTER 36. MOTORS AND MOtOR CONTROLS Table 1. Classification of Motors--(Concluded) Type Speed Charac teristics Full Voltage Starting Torque Starting Current Hp Range Type op Application See Footnote* 12. Capacitor Start Constant High Induction Run Normal Single 13. Repulsion .PHASE Induction Constant High Normal 14. Split Phase Constant and Adjust- . able Normal . Normal Small- (a) Fans Fractional. (b) pumps and compressors Medium Small () Fans* () pumps and' compressors Fractional () Fans r () pumps and compressors 00 fans-rdirect Adjustable Speed Drives : 15. Shunt Field . 'Adjustment Constant Normal Direct . . 16. ' Shunt Armature Resistor Variable. . Normal 17. Variable Voltage Variable Control Normal Normal Normal Normal All. All . AH. fa) Fans and . f" (e) centrifugal, pumps (o) Fans and = j () centrifugal pumps (d) Fans and centrifugal. pumps 18. Squirrel-Cage .. .'/High Slip, Transformer Adjustment Variable Poly phase 19. Squirrel-Cage Constant Separate Wind Multiing or Regrouped Speed Poles 2Q. Wound.Rotor, , Variable --External - Secondary: Resistance Normal Normal or High High Normal Normal or Low Low Medium ; (a) Fans Small All (a) Fans (b) pumps and (c). compressors -e All; (a) Fans/ (b) centrifugal pumps' and compressors . 21. Repulsion Variable High Single Phase 22. Capacitor Low Variable Low Torque Tapped Two Winding Speed . 23. Capacitor Low . Torque.Trans- former Adjust ment . Variable 24. Split Phase Constant Regrouped Poles Low r Normal Normal Normal - Low and () Fans--centrifugal Fractional . pumps () compressors Fractional Of) Fans, direct Low Fractional 00 Fans Normal - Fractional Of) Fans