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Rotating Electrical Machines Rotating Electrical Machines Rotating Electrical Machines Rotating Electrical Machines Educational Training Equipment for the 21st Century Educational Training Equipment for the 21st Century Bulletin 120H H-REM-120-CM-MP H-REM-120-CM-MP Universal Laboratory Machine Introduction Universal Laboratory Machine Computer Data Logging The Hampden MODEL H-REM-120CM-MP In order to demonstrate closed loop control, Universal Laboratory Machine, which can the H-REM-120CM-MP-CDLC Universal operate in a variety of AC and DC modes, is Laboratory Machine with Computer Data available to meet these needs and serve as Logging and Control provides a console an experimental platform of a wide variety of fully computerized for control and data electrical machine studies, including com- acquisition. Through the use of relays and puter analysis and control. digital instrumentation, the student can control all aspects of the Universal Machine In recent years the pattern of experimental in any mode of operation available. work on electrical machines in Technical Schools and Institutes, College and Univer- Hampden provides the H-REM-120CM-MP- sity laboratories has changed. More empha- CDLC as a fully configured turnkey, comput- Unit shown is sis is now placed upon the common erized machine learning center. The 220/308 V.AC 50Hz Unit shown is Hampden H-REM-LTCS Laptop Computer electromagnetic principles of machines, 120/208 V.AC 60Hz System provides the laptop computer, upon their dynamic performance and their cables, software and courseware as a use as elements in control systems. There is seamless package to make the curriculum also a growing tendency to introduce in the development process painless for the later stages of courses a more generalized instructor. approach to the analysis of electrical ma- chines. CDL Specifications MODEL H-REM-120-CM-MP All meters are supplied as digital devices On attempting to change laboratory courses MODEL H-REM-120-CM-MP to suit this new approach, it is soon found with integral 0-5V DC outputs. The Model urements on the Universal Machine. There is modes of operation. These windings are that the conventional laboratory machines H-REM-120CM-MP-CDLC contains solid- Dynamometer also a DC tachometer on the dynamometer. also terminated at a 24-pin socket so that, state relays, motor-driven rheostats, and a Technical Data offer too few experimental facilities. Further- if desired, the coil to coil interconnections motor-driven variable autotransformer, more, as the numbers of students in labora- Universal Machine Rating: The Universal Machine is basically a two- for a particular winding can be made by allowing remote machine operation, via 3kW, 115V, 4-pole, 2400-3600 RPM as a tory classes increase, the need for pole induction motor with all of the stator industry-standard Opto-22 relays, as well as simply inserting an appropriate pre-wired Ratings: separately excited DC generator. Operates multiplication of a given experiment arises coil ends brought out. Its rotor has a com- from the console. 1.5-2 KVA, 208/120V, 3ø, 60 Hz, 3400- plug, a variety of which are included with as a 115V shunt motor with field control and it then becomes costly, financially and mutator winding with 2ø and 3ø tappings. 3600 RPM in AC modes 1 kW, 115V, 1800- over same speed range. the machine. All signals are brought out to internal termi- in terms of space, to equip laboratories with All of these windings, including a rotor and 2400 RPM in DC modes. many machines of conventional type. nal strips, easy accessible for ribbon cable Full-pitch search coil on dynamometer stator search coil, as well as a full-pitch A three-position brush lifting mechanism is connection. Stator: armature. 36-position locking device for search coil on the dynamometer armature, fitted on the Universal Machine so that the 24 slots wound with a 12 coil single-layer stalled torque measurements. Description are brought out to the terminal panel. brushes can be lifted off the commutator winding, coil pitch 1-12. Four auxiliary com- The Universal Laboratory Machine set when they are not required, thus preventing Torque measurements by spring balance mutating windings are fitted on the d and q shown here consists of a 2 kVA uniform gap The stator coils can be connected to form a spurious effects from shout-circuited coils. axes. calibrated in pounds-feed and newton- variety of 1ø, 2ø, and 3ø windings with dif- meters. Optionally, the H-REM-LC-D Digital universal Machine coupled to a trunnion mounted DC dynamometer. The dynamome- ferent phase spreads for the AC modes of A rotor-angle indicator permits measure- Rotor: Load Cell can be provided, which has com- operation and also to form the main field, ment of machine load angle, winding induc- 36 slots, skewed one slot-pitch wound with ter torque can be measured under both mo- puter-level output for closed-loop control. compounding and compensating windings tances as a function of angular position, a full-pitch commutator winding having 12 toring and generating conditions by means coils, tapped for 2ø and 3ø outputs. Full- of a spring balance calibrated directly in that are required for the DC modes of opera- and, in conjunction with the dynamometer pitch search coils are fitted on stator and pounds-feet and newton-meters. tion. These windings are also to form the locking device static torque/angle character- rotor. A 36 position locking device is fitted in the main field, compounding -and compensat- istics. dynamometer to allow stalled torque meas- ing windings that are required for the DC All Hampden units are available for operation at any voltage or frequency All Hampden units are available for operation at any voltage or frequency 071515 071515 P.O. Box 563, East Longmeadow, MA 01028 • Tel 413-525-3981 • Fax 413-525-4741 • E-mail [email protected] 800-253-2133 P.O. Box 563, East Longmeadow, MA 01028 • Tel 413-525-3981 • Fax 413-525-4741 • E-mail [email protected] 800-253-2133 Rotating Electrical Machines Rotating Electrical Machines Educational Training Equipment for the 21st Century Bulletin 120-1G Educational Training Equipment for the 21st Century H-REM-120-CM-MP H-REM-120-CM-MP Universal Laboratory Machine Universal Laboratory Machine The nominal ratings of the Universal Ma- control of both AC and DC machines can be The terminal panel is equipped with neces- 5. Induction Start/Sync. Run switch for chine are 1.5-2 kVA 208/120V, 3ø, 60 Hz, devised using control devices such as sat- sary jumper cords for connecting up any operating Univ. Machine as a 3ø syn- 3400-3600 RPM in its AC modes of opera- urable reactors, variable frequency drives type of experiment within the capabilities of chronous motor. tion, and 1 kW 115V, 1800-2400 RPM in its and SCR drives. the unit. DC modes of operation. 6. Set of two switches for capacitor start- Versatile machines of this type are invalu- The terminal panel has the following meters ing and capacitor running the Universal The dynamometer has a rating of 3 kW able for student project work. terminating to HB-3M binding posts: Machine as a 1ø motor. 115V, 2400/3600 RPM as a separately excited DC generator and it can also be Tutorial Applications • 1 DC voltmeter, 0-150/300V 7. Three-pole full-voltage AC starter. Start operated as a 115V DC shunt motor over • 1 DC ammeter, 0-10A and Stop pushbuttons. On of the most important applications of the the same speed range using field control. Unit shown is • 1 AC ammeter, 0-10/20A 220/308 V.AC 50Hz Universal Machine is that of demonstrating • 1 DC ammeter, 0-15A 8. Automatic two-step DC starter with Primary Input to students some of the basic features of • 2 Wattmeters, 0-1.5/3kW overload and field failure protection. electrical machine theory, such as: • 1 DC ammeter, 0-20A Start and Stop pushbuttons. 208/120V, 3ø, 4-wire, 20A • 1 AC voltmeters, 0-150/300V • The relationship between the spatial • 1 Tachometer, 0-2000/4000 9. Dynamometer shunt field control with Modes of Operation distribution of current in a winding auxiliary resistor. Rheostat knob and and the resultant m.m.f. and flux By appropriate connection of the stator and Optionally, all meters can be supplied as toggle switch. density distributions. digital displays. rotor windings, the Universal Machine can 10. Universal Machine shunt field control operate in a wide variety of modes. The Universal Machine can operate in a vari- These many different modes of operation of • The relationship between winding The meter panel also provides three sets of with swamp resistor. Rheostat knob. spread and the space harmonics of • As a 3ø, 208/120V induction motor ety of DC modes. In some of these it is nec- one machine demonstrate the unity and ammeter receptacles, each terminating in essary to compensate the armature m.m.f. common principles of electrical machines. m.m.f. two HB-3M binding posts. 11. Speed control of Universal Machine with 2ø, 3ø, 6ø or 12ø secondary when operated as wound rotor motor. connections. because of the small, and uniform, air-gap The field conditions within all of these ma- length, which is of course desirable for the chines can be examined by means of the • The nature of the voltages induced in Rheostat knob and three-pole circuit commutator and phase windings by Accessories • As a 2ø, 120V/ø, induction motor induction modes. Speeds for 115V DC oper- search coils and the results can be used to breaker. stationary, pulsating and traveling flux A nylon facilon cover is available for the with the above secondary connec- ation are in the range 1800-2400 RPM.
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