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NTC-07.02 “Electric drive automatic control”

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Laboratory stand is designed for laboratory tests on electric drive control systems in Universities and secondary technical educational establishments.
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Laboratory stand is designed for laboratory tests on electric drive control systems in Universities and secondary technical educational establishments.

Structurally, the training system consists of the case with installed electrical equipment, relay unit, electrical plates, front panel and countertop of integrated desktop.

The case consists of:

  • power unit +5 V (current 1 Аm), +15 V (current 1 Аm), -15 V (current 1 Аm), +18 V (current 0,1 Аm), +110 V (current 1 Аm), +24 V (current 2 Аm);
  • electrical relay circuit board (3 time relays,1 current relay);
  • stopwatch circuit board with resolution 0,1 sec;
  • control unit and thyristor voltage regulator circuit board;
  • rectifier circuit board;
  • relay unit;
  • autotransformer.

The front panel has electrical schematics of investigated objects. All scheme, displayed on the panel, are divided into groups according to the theme of conducted experiments.
The panel includes: switch sockets, digital stopwatch indicator, digital equipment– DC/AC ammeters, voltmeter, speed meter, DC motor SL-221, AC motor UAM-052, tachogenerator, switch gear apparatus, controls, providing to measure elements parameters during laboratory experiment.

Functionally, the front panel is divided on six units:

1.Control schematics of DC electric motor.

The unit allows to investigate DC motor start in time function, in reactance voltage function, in current function, braking in time function, in reactance function, plugging.

2. Control schematics of asynchronous electric motor.

The unit allows to investigate the start, reverse, plugging, dynamic braking of asynchronous motor with squirrel-cage rotor. The current regulator of dynamic braking is located inside the unit.

3. Thyristor converter and closed control system DCM unit.

Thyristor regulator provides smooth measurement of output voltage from 0 to 80 V. Closed control system has back current and speed couplings.

4. Electric machine unit with following installed equipment:

DC electric motor, asynchronous motor with squirrel-cage rotor and tachogenerator. The electric cars shafts are connected with each other by rubber belt.

5. Regulators and stopwatch unit.

Time controllers, current relay, comparator actuation level relay, current level regulator of dynamic braking, adjustable starting resistors in the armature motor circuit are located in the unit. Digital stopwatch indicator and its controllers are located in the unit. 

6. Measurement equipment and power supply unit. Power switch, LED switch power indication in each phase, line fuses are located inside the unit.
Digital indicators:

    • AC ammeter (measurement limit 0,5Аm, accuracy class 1)   1 pc.;
    • DC ammeter (measurement limit 1Аm, accuracy class 1)     1 pc.;
    • DC ammeter (measurement limit 0,5Аm, accuracy class 1)  1 pc.;
    • DC voltmeter (measurement limit 100V, accuracy class 1)    1 pc.;
    • rotation speed meter (measurement limit 5000 rev/min, accuracy class 1) 1 pc.

To conduct laboratory experiment it’s necessary to assemble the circuit of investigated object, using jumpers, which allow to show the circuit in visual form.
The training system is supplied with:
  • a software to test and pass students before the experiment. Both theoretical knowledge and knowledge of the contents of the laboratory experiment are checked. As a result of testing the student receives the mark;
  • a set of methodical and technical documentation for teaching staff.

Experiments provided:

  1. Direct current motor start in time function.
  2. Direct current motor start in electromotive force function.
  3. Direct current motor start in current function.
  4. Direct current motor braking in electromotive force function.
  5. Direct current motor braking in time function.
  6. Direct current motor braking by plugging.
  7. Starting asynchronous motor with squirrel-cage rotor.
  8. Braking asynchronous motor with squirrel-cage rotor by plugging.
  9. Reversing asynchronous motor with squirrel-cage rotor.
  10. Dynamic braking of asynchronous motor with squirrel-cage rotor in time function.
  11. The study of thyristor one-phase converter.
  12. The study of direct current motor open control system.
  13. The study of direct current motor closed control system. The study of direct current motor double circuit control system.

Technical specifications:

Power supply 3~220/127V, 50Hz
Power consumption, Watt less than 500
Stand overall dimensions:
Width, mm 1310
Height, mm 1460
Depth, mm 600
Weight, kg 44

Complete set:

  • laboratory training system – 1 pc.;
  • passport – 1 pc;
  • set of jumpers – 1 pc.