NTC-07.24.1 “Electric drive with MPCS M1”

The training laboratory system is designed to conduct laboratory experiments on the course “Electric drive”. The system has an intelligence protection system of its main electronic units. 

 

 

Category:
The training laboratory system is designed to conduct laboratory experiments on the course “Electric drive”. The system has an intelligence protection system of its main electronic units.

Structurally, the training system consists of: 

  • “Basis” training system;
  • two electric machine equipment.

The case consists of: 

  • Industrial frequency converter LENZE SMV is used to form three-phase AC circuit of regulated frequency and current of asynchronous electric motor power.
  • Three pulse-width converters are used to supply the armature circuit, excitation winding circuit of DC electric motor and the armature circuit of auxiliary (load) DC machine.
Pulse-width converters based on the power IGBT-modules PS11035. The microprocessor control diagram, based on the microcontroller Fujitsu MB90560, controls the power modules, sets operating modes, measures input (voltage setting), output (current, voltage) parameters of the converter, displays the measurement values. Microprocessor control of pulse-width converter protects the converter from short-circuit currents, insufficient voltage supply of power module drivers, DC circuit overvoltage, false setting signals, etc.
 
Two power module arms are used for reversible PWC, another arm is used as non-reversible PWC to supply excitation winding of DC motor.

Reversible PWC may operate in symmetrical (alternate diagonal switching) or non-symmetrical (diagonal switching of one-pair transistors) modes.

  • Measurement module is used to measure current, voltage, power consumption, speed rotation, load moments and another parameters of investigated equipment.

The digital measurement complex, built-in the training system and connected to PC via USB bus, conducts the most measurements. On the panel of the training system the following equipment is installed: five indicators of digital measurement equipment with accuracy class not less 1: two voltmeters, two ammeters, one wattmeter.

  • Power contactors of relay subsystem.
  • Energy discharge resistors in overvoltage on the intelligent modules.
  • Industrial converter LENZE POSITION SERVO is used for servo driver control.

Electrical and structural schemes of investigated objects are shown on the front panel. All schematics, represented on the panel, are divided into the groups, according to the theme of investigated laboratory experiments. The panel includes the measurement equipment indicators, switch gear apparatus, controls, allowing to change the elements parameters during laboratory experiment.

Two electric machine equipment, mounted on the frame, include: 

  • Asynchronous motor with squirrel-cage rotor (Lenze or analogue) (Рrated = 0,5-0,7 kW, nrated = 2760 r/min), DC electric motor of independent excitation (Lenze or analogue) (Рrated=0,5-0,7 kW, nrated=3000 r/min), impulse sensor of frequency rotation, electromagnetic clutch (Mrated=2Н*m, nmax=3000 r/min).
  • Synchronous electric motor with constant magnets (Lenze or analogue) (Рrated=0,5-0,7 kW, nrated=4000 r/min), DC electric motor of independent excitation (Lenze or analogue) (Рrated=0,5 kW, nrated=3000 r/min), impulse sensor of frequency rotation.

The controls on the front panel include:

  • potentiometer to form signal set for control systems and alternating resistors for regulation of feedback ratio and coefficients of analogue control system transmition. 
  • setting potentiometer of PWC of power supply excitation winding of DC motor (0 ÷ 250 mА);
  • setting potentiometer of PWC to supply braking clutch;
  • toggles and buttons of setting of converters operating modes;
  • converters toggles and turn on/off buttons.
  • sockets to connect converters and measurement complex to PC / laptop.

The training system is supplied with:

  • a set of technical and methodical documentation for teaching staff;
  • a software.
 

 

Experiments provided

  1. Investigation of mechanical characteristics of direct current motor of independent excitation (DCM-IE).
  2. Investigation of an open-loop system “controlled rectifier – direct current motor” (CR-DCM).
  3. Investigation of an open-loop system “pulse-width converter – direct current motor” (PWC-DCM).
  4. Investigation of characteristics of a single-circuit system PWC-DCM with current feedback.
  5. Investigation of characteristics of a single-circuit system PWC-DCM with velocity feedback.
  6. Investigation of characteristics of a double-circuit system PWC-DCM with current and velocity feedback.
  7. Investigation of characteristics of a system PWC-DCM with position feedback.
  8. Investigation of mechanical characteristics of asynchronous motor with squirrel-cage rotor (AM-SCR).
  9. Investigation of an open-loop system “autonomous inverter – asynchronous motor with squirrel-cage rotor” (AI – AM-SCR).
  10. Investigation of characteristics of a system AI – AM with scalar regulation and open-loop velocity feedback.
  11. Investigation of characteristics of a system AI – AM with scalar regulation and closed loop velocity feedback.
  12. Investigation of characteristics of a system AI – AM with vector control.
  13. Investigation of mechanical characteristics of synchronous motor (SM).
  14. Investigation of an open-loop system AM-SM.
  15. Investigation of SM system of holding torque regulation.
  16. Investigation of step-by-step operation of a system “converter-SM”.
  17. Investigation of SM-based servo drive.
  18. Investigation of single-phase thyristor CR.
  19. Investigation of three-phase thyristor CR.
  20. Investigation of PWC with asymmetric regulation.
  21. Investigation of PWC with symmetric regulation.
  22. Investigation of AI.

Technical specifications

Power supply 3~220/127V 50Hz
Power consumption, kW ≤1,5
Stand overall dimensions:
Width, mm 1310
Height, mm 1460
Depth, mm 600
Module overall dimensions:
Width, mm 140
Height, mm 550
Depth, mm 550
Machine aggregation №1 overall dimensions:
Width, mm 300
Height, mm 400
Depth, mm 1200
Machine aggregation №2 overall dimensions:
Width, mm 150
Height, mm 140
Depth, mm 400
Weight, kg ≤140

Technical specifications of measuring system:

Number of displayed parameters on the stand 12
Measured voltage range ±400 V
Measured current range ±10 А
Measured velocity range ±400 rad/s
Technical characteristics of pulse-width converter:
Nominal current ±10 А
Direct current link voltage 300 V
Modulation frequency 8 kHz

Technical specifications of frequency modulator:

Power 4,7 kW
Nominal current 25 А
Output voltage operating range 3~220V
Modulation frequency 8 kHz

Scope of delivery

  • training laboratory system – 1 pc.;
  • CD with supplemental documentation  – 1 pc.;
  • passport – 1 pc.;
  • jumpers set – 1 pc.

Necessary additional equipment