Determining the mechanical data of a machine

The mechanical data of a machine means the mechanical losses and the moment of inertia.

The mechanical losses can be determined with a static measurement, i.e. with a constant speed. For this measurement, the moment of inertia is not effective. The mechanical losses consist of the bearing friction and the energy required for cooling.

For a dynamic measurement with constant acceleration, the moment of inertia as well as the mechanical forces from friction and cooling are also effective. The moment of inertia can then be determined.

Objectives

• Mechanical losses
• Fan losses
• Moment of inertia

The learner will get to know the fundamentals of mechanical losses and the moment of inertia with an asynchronous machine. These properties are investigated in several experiments. Another group of experiments with the behaviour of different work machines. Characteristics diagrams are recorded and analysed for evaluation purposes.

Highlights:

• The measurements are carried out with the CASSY Machine Test.
• All measurements can be carried out with or without a computer.

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 equipment is equally suitable for pupil and student experiments in the laboratory with low voltage (DC, AC and three-phase 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.

Topics

• Friction torque of a machine
• Static torque characteristic
• Dynamic torque characteristic
• Moment of inertia of the set-up
• Moment of inertia of the machine