ELM Basic Machines for Extra-Low Voltage

ELM Basic Machines for Extra-Low Voltage
ELM Basic Machines for Extra-Low Voltage

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This experiment/set up contains dangerous goods.
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The experiments use components from the electrical machine teaching models system and utilise safety extra-low voltage. All machines are mounted on a base unit which is set up vertically in a training panel frame.


  • Recognising basic physical principles
  • Recording machine characteristics
  • Introduction to drive technology
  • Use of simple tools (spanners, oil cans etc.)

This equipment set allows DC, AC and three-phase machines to be assembled from a few easily sorted separate components. The fully functional machines demonstrate the various combinations of stators and rotors and allow for investigation of the various circuit configurations. In spite of these educational machines having model-like characteristics, it is possible to demonstrate the physical processes and typical responses of large-scale machines. The machines are mounted on a base terminal unit and set up with special overlay masks. The open design makes it possible to observe the individual functioning parts in operation. All experiments are carried out using safety extra-low voltage. In addition to conventional machine types, the fundamental properties of linear motors are also covered. New to the range are the three-phase machines with permanently excited rotors made of rare earth metals (high-efficiency rotors).

The equipment set incorporates student experiments which can be carried out in a laboratory safely using safety extra-low voltage. Experiment instructions are contained in a manual in either printed or digital form.

The target group is made up of students in general or vocational education. The experiments are designed as an introduction at a simple level of understanding.

For more advanced understanding, E2.1.3.2 ELM High-efficiency machines for safety extra-low voltage is recommended.


  • AC generators with permanent magnet
  • How terminal voltage depends on speed and load
  • Determination of neutral zone
  • Three-pole rotors/twelve-pole rotors
  • Generators with separate excitation
  • Remanence and self-excitation
  • Series-wound and shunt-wound generators
  • Compound-wound generators
  • AC generators
  • Stationary armature and rotating armature machines
  • Three-phase generators
  • Generator with load in star circuit with and without neutral conductor
  • Delta circuit for a generator
  • Synchronisation of three-phase generators with the mains
  • DC motors
  • Commutation
  • Motors with separate excitation
  • Shunt-wound/series-wound/compound-wound motors
  • AC motors
  • Universal motors
  • Single-phase synchronous and asynchronous (induction) motors
  • Starting motors
  • Single-phase induction motor with capacitive/resistive auxiliary phase
  • Repulsion motors
  • Speed control and reversal by adjusting brushes
  • Shaded-pole motors
  • Rotating fields
  • Reversal of rotational sense
  • Three-phase motors
  • Three-phase squirrel cage rotors
  • Star and delta circuits
  • Speed response to loading
  • Braking circuits
  • DC braking
  • Stator resistance starting circuit
  • Three-phase slip-ring rotors
  • Rotor standstill voltage and rotor current
  • Switchable pole three-phase motors in Dahlander configuration
  • Three-phase machines with six pole pieces
  • Synchronous motors
  • Linear motors

Similar to illustration

Main components:

Components of equipment sets

6 56311  4  ELM coil, 250 turns LD
1 56312  4  ELM squirrel-cage rotor LD
5 56313  4  ELM brush LD
1 56317  4  ELM centring disc LD
1 563181  4  ELM brush holder rack LD
1 56322  8  ELM two-pole rotor LD
1 56323  8  ELM three-pole rotor LD
1 56324  8  ELM drum rotor LD
1 56325  8  ELM rotating field attachment and squirrel cage ring LD
1 56328 ELM magnetic needle rotor LD
1 56329  8  ELM aluminium ring with iron disc LD
2 563091  4  ELM pole piece for magnets LD
3 563101  8  ELM wide pole piece for coils LD
3 563115  4  ELM coil, 500 turns LD
6 563201  4  ELM narrow pole piece for coils LD
2 563211  8  ELM split pole piece for coils LD
1 727811  8  Basic machine unit LD
1 72782  4  Basic terminal unit LD
1 72783  8  Set of masks LD
1 72785  4  Starter LD
1 72786  4  Field regulator LD
1 72787  4  Star-delta load LD
1 72788  8  Drive unit LD
1 68596  4  Driving belt, long for drive unit 72788 LD
1 51048  4  Magnets, 35 mm Ø, pair LD
3 57816  4  Capacitor, 4.7 µF, STE 2/19 LD
3 57906  4  Lamp holder, E10, top, STE 2/19 LD
1 57910  4  Push button (NO), STE 2/19 LD
1 57913  8  Toggle switch STE 2/19 LD
1 56304  4  Storage tray for ELM apparatus LD
1 564171  4  LIT: El. Motor & Generator (German) LD
1 564172  4  LIT: El. Motor & Generator (English) LD
2 531282  8  Multimeter Metrahit Pro LD
1 524013S  8  * Sensor-CASSY 2 Starter LD
1 5800136  8  Tachometer (handheld) LD
Power supply:
1 725721G Three-phase generator in case LD
1 72609  4  Panel frame T130, two-level LD
1 50059  8  Safety bridging plugs, black, set of 10 LD
1 500592  8  Safety bridging plugs with tap, black, set of 10 LD
1 500851  4  Safety connecting leads, 32 A, set of 32 LD
3 505171  4  Bulbs, 6 V/1.1 W, E10, set of 10 LD
3 505191  4  Bulbs, 15 V/2 W, E10, set of 5 LD
1 56316  4  Hex key LD
1 56331  4  Oil, 100 ml, in dropping bottle LD
additionally required:
PC with Windows 7/8/10

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

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