DC compound machine, 1.0

The experiments are carried out with industrially manufactured machines class 1 kW. The 1 kW machines have a higher efficiency because of the lower winding resistance and come closer to an ideal machine. All test machines have a special base for connection to the machine testing system 1.0. The machine testing system is used to record the characteristic curves of the test machines. The power supply for the test machines is provided by special laboratory power 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 1.0 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 1.0 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

Several integrated servers are available in Machine Test CASSY 1.0 for the local media connection of at least four end devices simultaneously.

For more details, see product data 7732900 or 7731901 Machine Test CASSY 1.0

The equipment is equally suitable for student experiments in the laboratory with mains voltage (220 V direct current) and - with a mobile trainer - for teacher demonstrations in the classroom or lecture hall. 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:

• E2.3.2.2 Universal motor DC
• E2.5.2.1 Four-quadrant operation of a DC machine with controlled rectifiers

Topics

• 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