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.
Objectives
- 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.
Highlight:
- 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
Topics
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Connection and operation of the compound machine as series, shunt and double-phase machine
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Armature reaction and commutation
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Characteristics of motors
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Load characteristic of a generator
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Possibilities of speed setting and voltage setting
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Starting and braking
-
Characteristics of generators
Main components:
| 1 | 773 186 | Compound machine, 0.3  |
| 1 | 732 83 | Motor protection switch, 1.6-2.4 A |
Set-up for the machine test
| 1 | 745 563 | Power circuit breaker |
Machine test system 300 W | 1 | 773 1900 | Machine Test CASSY, 0.3 |
| 1 | 524 222 | CASSY Lab 2 for Drives and Power Systems |
| 1 | 773 1991 | Electrical dynamometer, 0.3 |
| 1 | 773 108 8 | Coupling / shaft end guard 0.3, transparent |
| 1 | 773 110 | Machine base bench, 90 cm |
| 1 | 315 39 4 | Weight, 1 kg |
Alternative machine base unit:
A longer machine base unit is required if drives with commutation are used.
| 1 | 773 115 | Machine base bench, 120 cm |
| 1 | 731 06 4 | Coupling, 0.3 |
Extension for additional motor experiment | 1 | 731 94 8 | Starter, 0.3 |
| 1 | 731 95 4 | Field rheostat, motor, 0.3 |
Extension for additional generator experiment | 1 | 773 360 | Controllable resistive load, 0.3 |
| 1 | 731 96 4 | Field rheostat, generator, 0.3 |
Manuals: | 1 | 775 190DE 4 | LIT-print: DC machines 0.3, German |
| 1 | 775 190EN 4 | * LIT-print: DC machines 0.3 |
Power supply: | 1 | 725 852DG 4 | DC machine supply, 0.3 |
| 1 | 726 09 4 | Panel frame T130, two-level |
| 2 | 500 59 8 | Safety bridging plugs, black, set of 10 |
| 1 | 500 591 4 | Safety bridging plugs, yellow/green, set of 10 |
| 1 | 500 855 4 | Safety experiment cables, 32 A, set of 34 |
| 1 | 500 856 4 | Safety experiment cables, 32 A, yellow/green, set of 5 |
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 | 773 181 4 | Assembly set el. machine base 0.3 short |
| 1 | 773 182 4 | Assembly set el. machine base 0.3 long |
Articles marked with * are not essential, we do however recommend them to carry out the experiment.
