Method for analyzing the condition of motors based on the use of fiber-optic-fiber-acoustic sensors

// Electric Drives // Electronics and Electrotechnology
Ref-Nr: 17454

Abstract

The invention relates to a reliable, accurate and cost-effective method for analyzing the condition of electromechanical energy converters. In contrast to previous analyses, it is not necessary to intervene in or dismantle the electromechanical energy converter in order to determine its condition and/or the cause of a fault. With the method according to the invention, considerable costs can be avoided by timely intervention.

background

All electric motors use wound coils or coil bars, which must be provided with insulation. Partial discharges are an important indicator of the failure of this insulation. A partial discharge does not necessarily lead immediately to an electrical breakdown, but the insulating material will still be damaged. Sooner or later, partial discharges will inevitably lead to motor failure. Early detection is therefore highly relevant in order to avoid total failure.
The invention relates to a reliable, accurate and cost-effective method for analyzing the condition of electromechanical energy converters. In contrast to existing analyses, it is not necessary to intervene in or dismantle the electromechanical energy converter in order to determine its condition and/or the cause of a fault.

With the method according to the invention, considerable costs can be avoided by timely intervention.

Innovation / Solution

The motor is equipped with (fiber-optic and/or fiber-acoustic) sensors that can pick up vibrations or sound and/or light pulses. Due to the small dimensions of the individual fibers, these can be integrated directly into the winding, for example. They transmit their measurement data to a diagnostic system in which the input signals are processed in analogue form and digitized. This is follo-wed by a second, now digital, processing of the measurement data using common signal processing algorithms and finally an evalua-tion by an expert system. As a result, an assessment of the condition of the engine is generated. The results can be presented locally via LEDs or a display, for example, but can also be forwarded via a network.

Benefits

Cost savings due to permanent monitoring of the motor, which means that routine checks can either be completely eliminated or the maintenance intervals can be extended compared to conventional motors. Prevention of total failure of a motor, so that high follow-up costs are avoided. Possibility of retrofitting the diagnostic system according to the invention to existing motors Although the invention achieves considerable added value, the production of a corresponding motor is only slightly more expensive than that of a conventional motor. The electronics and the fiber-optic-fiber-acoustic sensors can be mount-ed in motors in such a way that safe-ty-critical components do not have to be changed. Contact with low-voltage or high-voltage components, for ex-ample, is not necessary and is also not harmful

fields of application

The field of application of the invention lies in the area of transportation and mobility, in particular in the condition monitoring of electric motors.

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