Asynchronous motors are in widespread use as drive mechanisms. They too can generate machine vibrations. If there is an asymmetric gap, the circulating magnetic forces induce rotational and bending vibrations. The same applies to partial failure of the electrical windings. In this case, the asymmetrical magnetic field also induces mechanical vibrations. The PT 500.19 accessory set features an adjustable centering device to adjust an asymmetrical gap. A winding that can be switched off generates an electromagnetic asymmetry. The control unit of the PT 500 base system powers the asynchronous motor and permits the speed to be adjusted. The motor is subjected to load by the PT 500.05 brake and load unit.
The accessory set is mounted on the bse plate of the machinery diagnostic base system PT500. The PT 500.02 instrumentation kit is required for this experiment. It includes a portable vibration analyser and all the necessary sensors to record the vibration phenomena.
Learning Objectives / Experiments
- Influence of the gap on vibration behaviour - Influence of electromagnetic asymmetry on vibration
behaviour - Influence of the load on the level of vibration - Influence of the gap on electromagnetic losses and
efficiency - Influence of speed on vibration behaviour - Experiment familiarises students with the
fundamentals of vibration measurement methods
for plant/machinery condition monitoring - Understanding and interpreting frequency spectra - Use of industrial vibration measuring devices
In conjunction with a current measuring probe: - Measurement of current consumption per phase
Features
* Interaction of electromagnetic and mechanical
elements of the system1 * Adjustable asymmetric gap between stator and rotor1 * Electromagnetic asymmetry with winding that can be
[1] Investigation of vibration behaviour of an electric motor [2] Asynchronous motor with adjustable gap [3] Asymmetric magnetic field by winding with shut-off facility [4] Eccentricity of armature adjustable via position of bearing cover [5] Speed control via frequency converter of base unit [6] Speed display on control unit of base unit PT 500 [7] Power display on control unit of base unit PT 500 [8] Accessory set for PT 500 machinery diagnostic training system [9] Stackable storage box for all components
Technical Data
Speed-controlled asynchronous motor - speed range: 100...6000rpm - nominal power output: 370W
Eccentricity of armature: 0...0.2mm
Dimensions and Weight
l x w x h : 600 x 400 x 315 mm (box) Weight : approx. 23 kg
Scope of Delivery
1 electric motor with terminal box 1 set of fit washers 1 storage box with foam inlay 1 instruction manual
