Document jm9240qD81y8JLYoZ0vXpBY4p

620 CHAPTER 35 1946 Guide Typical Specifications for Single Phase Motors . ..........................Hp,.......................... RPM, Cycles, Volts, Single Phase Motor of the...................................................Type for Driving.........................................1....... Motor Shall (Capacitor, Split Phase, etc.) (Application) Be Arranged/or jvertical^} Mounting And Shall Be Provided With a...................................... ..... ............... Type of Enclosure, NEMA (Open, Splashproof, etc.) ^ {sleeve} Bear*n&s: Insulation, And Typical Specifications for Squirrel-Cage Motor Control Control for Squirrel-Cage.................... ..................... Motors Shall Consist of An Enclosed (Fan, Pump, etc.) {Maggie} Type{R^JhVoITta|e} Starter Providin* verload Protection And Low Voltage Control Shall Include A Safety Disconnect Switch (fn^ CommonEndosure} With the Starting Control.e, / Typical Specifications for Wound Rotor Motor Control Control for Wound Rotor Motor Control for........ Applications Shall Consist of a Safety (Fan, Pump, etc.) Disconnect Switch, a {olminon^} Mounted Across the Line Starter Providing Over- load Protection, Low Voltage {r^ST"}' and a SeCOndary {l^S" Regulating} Controller for (M^ndng^in slmfEnclosure}' Primary and Secondary Contro1 Sha" Be Interlocked so as to Provide Complete Control from the Rheostat Handle. the commutator when the. motor comes up to speed. These, motors are suitable for applications such as industrial compressors where high break-away torque is required and where commutator and brush noise are not factors. - Split Phase motors have a high resistance auxiliary winding which is in the circuit during starting but is disconnected through the action of a centrifugal switch as the motor comes up to speed. Under running con ditions it operates as a single phase induction motor with one winding in the circuit. These units are available for the squall"horsepower ratings and when equipped-with-a high slip rotor may be used for adjustable PER CENT OF FULL LOAD TORQUE FrG. 9. Performance Characteristics of A Wound Rotor Motor wtth External Resistance varying speeds through line voltage control. The motors are ideally suited for fan duty. Speed-torque characteristics of single phase motors are shown in Fig. 10. Typical specifications for single phase motors are shown on page 620. CONTROL FOR ALTERNATING CURRENT MOTORS Squirrel-Cage motors are usually linestarted where power company limitations permit. In sizes up to 2 hp the motors are started by means of manual switches with an overload current element for motor protection. Fig. 10. Speed-Torque Characteristics of Single Phase Motors..