The experiments are carried out using industrial-design machines. All the test machines possess a special base for connecting the machine test system 1.0. The testing system can be used to record the characteristics of the machines under test. Power for the machines is supplied either via the mains or by special laboratory power supplies.
Learning objectives
- Protective measures and electrical safety.
- Setup and commissioning of electrical machines.
- Use of starting circuits.
- Assessment of characteristic curves of electrical machines.
Asynchronous machines as squirrel cage rotors are widely used. These are particularly low-maintenance motors. With the supply by frequency converters, these are increasingly replacing DC machines. Squirrel cage asynchronous machines are used as motors and rarely as generators. The asynchronous motor in this configuration has the suffix 230 / 400 V, which corresponds to the rated voltage specification of the motor. Only with this voltage must the motor be operated in a 230 / 400 V in the star and therefore no start-up can take place in the star delta.
Highlights
- To protect against overheating, the stator windings of the test machines are equipped with thermal detectors.
- In the event of overheating, the machine test CASSY 1.0 system switches off the load of the test machine, thus maintaining air cooling. This prevents damage to the test machines.
- The test machines have a didactic terminal board with the winding diagram printed on it.
- All winding ends are led out to safety sockets (4 mm) on the terminal board.
- Computer-aided data acquisition provides meaningful measurement results.
- The arrangement of the 4 mm safety sockets complies with the standards for industrial motors.
Measuring and media system
Machine Test CASSY
The machine test CASSY 1.0 can be quickly operated in all functions directly via the display, the rotary knob and the buttons on the device. All settings and measurement results can be saved on the device and quickly called up again later or simply downloaded.
In addition, the machine test CASSY 1.0 can be fully controlled in real time via the RJ45 Ethernet, W-LAN and USB-C interfaces.
These interfaces can be used by the following software:
- CASSY Lab 2 for drive and energy technology,
- MATLAB and LabVIEW,
- Lab Docs Editor Advanced.
The following integrated servers are available in the machine test CASSY 1.0 for the local media connection of at least four end devices simultaneously.
Further information can be found in the product documentation 7732901 machine test CASSY 0.3.
Target group
The target group is industrial trainees and students specialising in electrical engineering. The course offers tests at an intermediate level for the vocational school and at the same time provides the necessary insights into the machine behaviour for a scientific interpretation in the bachelor training. The media connection makes the experiments suitable for demonstration in the classroom or a lecture theatre.
The following equipment includes extended experiments with asynchronous machines.
- E2.2.4.1 Squirrel cage rotor, 400/690
- E2.2.4.3 Slip ring rotor.
- E2.2.4.4 Squirrel cage rotor D..
- E2.2.4.5 Multifunction machine.
- E2.5.3.5 Drives with industrial frequency converter, 1.0
- E2.5.4.2 Direct starting or starting with a soft starter of an asynchronous motor under load.
- E2.5.4.4 Operating behaviour of variable-speed asynchronous motors under load.
