DC compound machine, 0.3

DC compound machine, 0.3
DC compound machine, 0.3

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This experiment/set up contains dangerous goods.
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The tests are carried out with industrially manufactured machines. All test machines have a special base for connection to the Machine Test System 0.3. With the Machine Test CASSY all measured values of the DC machines are recorded. The measured values can be shown directly on the built-in display as a single value, table of a measurement series or diagram. The measurements can be made without additional software. The power supply for the test machines comes from special laboratory supplies.


  • Protective measures and electrical safety
  • Setting up  DC machines and putting them into operation
  • Use of starting circuits
  • Assessment of  DC machine characteristics

Compound machines feature two separate field windings and can therefore be operated as series-wound, shunt-wound or compound-wound machines. The series-wound winding can also be tapped in order to investigate various types of compound winding.


  • In order to protect against overheating, the stator windings of the test machines are equipped with temperature detectors.
  • In case of overheating, the machine testing system switches off the load of the test machine, thus maintaining the air cooling. This prevents damage to the testing machines.
  • The test machines are equipped with an educationally designed terminal board with the winding configuration printed on it.
  • The ends of all the windings are led out at the terminal board at safety sockets (4 mm).
  • Computer-supported acquisition of measurement data provides for meaningful measurement results

All functions of the Machine Test CASSY 0.3 can be operated quickly and directly via the display, the rotary wheel and the buttons on the unit. All settings and measurement results can be saved on the unit and quickly called up again later or simply downloaded.

In addition, the Machine Test CASSY 0.3 is fully controllable in real time via RJ45 Ethernet, W-LAN and USB-C interfaces.

These interfaces can be used by the following software:

  • CASSY Lab 2 for drives and energy systems,
  • MATLAB® and LabVIEW ™
  • Lab Docs Editor Advanced

The following integrated servers are available in the Machine Test CASSY 0.3 for the local media connection of at least four end devices simultaneously.

For more details, see product data 7731900 or 7731901 Machine Test CASSY 0.3

The individual equipment is equally suitable for student experiments in the laboratory with low voltage (220 V DC) and - with a mobile trainer - for teacher demonstration in the classroom. The experiments are carried out according to the manual.

The target group is made up of commercial apprentices and students of electrical machine construction. The course offers experiments at an intermediate level and also allows for the necessary insight into machine behaviour for scientific interpretation at undergraduate level. The media connection makes the experiments suitable for demonstration in the classroom or a lecture hall.

In the following configurations there are further extended experiments with DC machines:

  • E2.2.2.2 Universal Motor DC 0.3
  • E2.5.2.1 Four-quadrant operation of a DC machine with controlled rectifiers
  • E2.5.2.2 Four-quadrant drive of a DC machine with an IGBT H-bridge circuit
  • E2.6.2.1 DC servo with industrial DC machine


  • Connection and operation of the compound machine as series, shunt and double-phase machine
  • Armature reaction and commutation
  • Characteristics of motors
  • Load characteristic of a generator
  • Possibilities of speed setting and voltage setting
  • Starting and braking
  • Characteristics of generators

Main components:

Components of equipment sets

1 773186 Compound machine, 0.3 LD
1 73283 Motor protection switch, 1.6-2.4 A LD
Set-up for the machine test
1 745561 Power circuit breaker module LD
Machine test system 300 W
1 7731900 Machine Test CASSY, 0.3 LD
1 524222 CASSY Lab 2 for Drives and Power Systems LD
1 7731991 Electrical dynamometer, 0.3 LD
1 773108 Coupling / shaft end guard 0.3, transparent LD
1 773110 Machine base bench, 90 cm LD
1 31539 Weight, 1 kg LD

Alternative machine base unit:

A longer machine base unit is required if drives with commutation are used.
1 773115 Machine base bench, 120 cm LD
1 73106 Coupling, 0.3 LD
Extension for additional motor experiment
1 73194 Starter, 0.3 LD
1 73195 Field rheostat, motor, 0.3 LD
Extension for additional generator experiment
1 773360 Controllable resistive load, 0.3 LD
1 73196 Field rheostat, generator, 0.3 LD
1 775190DE LIT: DC machines, 0.3 LD
1 775190EN * LIT: DC machines 0.3 (English) LD
Power supply:
1 725852DG DC machine supply, 0.3 LD
1 72609 Panel frame T130, two-level LD
2 50059 Safety bridging plugs, black, set of 10 LD
1 500591 Safety bridging plugs, yellow/green, set of 10 LD
1 500855 Safety experiment cables, 32 A, set of 34 LD
1 500856 Safety experiment cables, 32 A, yellow/green, set of 5 LD
Additionally required:
PC with Windows 7/8/10

As an option for existing motors:

The following base  are options to use existing motors on site.
It's possible to use machines  with  B3 design and a 71 mm shaft  level.

1 773181 Assembly set el. machine base 0.3 short LD
1 773182 Assembly set el. machine base 0.3 long LD

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

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