Slip Ring Motor, 0.3 kW

Slip Ring Motor, 0.3 kW
Slip Ring Motor, 0.3 kW

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This experiment/set up contains dangerous goods.
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The experiments are carried out using machines of industrial manufacture. All the test machines are equipped with a special base for attachment to the Machine test system 0.3. The system allows the characteristics of the machines under test to be recorded. Power for the machines under test is provided either directly from the mains or via special laboratory power supplies.


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

Motors with slip-ring rotors (wound rotor motors) represent a type of asynchronous induction machine. Unlike squirrel cage rotor machines a slip-ring rotor is in the form of a three-phase winding attached to a slip-ring and accessible from the outside via brushes. Wound rotor motors are preferred for use in drives which require high torque but low starting current. Asynchronous machines with slip-ring rotors are increasingly being replaced with conventional machines featuring squirrel cage rotors fed via a frequency converter. Such drives achieve similar operating response to slip-ring rotor motors but they are easier to manufacture and avoid wear to the slip contacts, which undergo both mechanical and electrical wear and tear.


  • In order to protect against overheating, the stator windings of the test machines are equipped with temperature sensors
  • Should overheating occur, the machine testing system automatically shuts down the machine under test, thus preventing any damage to it.
  • 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 connected to the terminal board and can be accessed via 4-mm safety sockets.
  • Computer-supported acquisition of measurement data provides for meaningful measurement results.

The individual equipment set is equally suitable for student experiments in laboratories with low voltage supplies (400 V three-phase) and for setting up on a mobile trolley for demonstration by teachers in a classroom. The procedures for the experiments are provided in a printed 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 motor may only be connected in star (Y) configuration to the 400 V mains.


  • Design and function of a motor with slip-ring rotor
  • Starting
  • Measurement of rotor standstill voltage and rotor current
  • Adjusting speed via starting resistors
  • Characteristics in motor operation
  • Use of slip-ring rotor asynchronous machines as three-phase transformers

Main components:

Components of equipment sets

1 773233 Slip Ring Motor 0.3 LD
1 73213  8  Motor protection switch, 0.6-1 A LD
1 745561 Power circuit breaker module LD
1 73229 Rotor starter 0.3 LD
1 7732000 Machine Test System 0.3 LD
1 524222 CASSY Lab 2 for Drives and Power Systems LD
1 73106  4  Coupling 0.3 LD
Additional recommended:
Power supply:
1 72675  8  Three-phase supply unit with RCD LD
1 72609  8  Panel frame T130, two-level LD
2 50059 Safety bridging plugs, black, set of 10 LD
1 500591  8  Safety bridging plugs, yellow/green, set of 10 LD
1 500855  8  Safety connecting leads, 32 A, Set 34 LD
1 500856  4  Safety connecting leads, 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  8  Assembly set el. machine base 0.3 long LD
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