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Design of a Balancing Device for Small High Speed Rotors

Pfeffer, Daniel and Klug, Florian and Schlaak, Helmut F. and Pott, Peter P. (2016):
Design of a Balancing Device for Small High Speed Rotors.
In: ACTUATOR 2016, 15th International Conference on New Actuators & 9th Exhibition on Smart Actuators and Drive Systems, Bremen, Germany, 13. - 15. Jun. 2016, [Conference or Workshop Item]

Abstract

An unbalance in high speed rotating machines leads to unwanted noise and vibration and thus to increased wear in bearings and higher friction losses. Therefore, it is desired to reduce the unbalance of the rotor to a well-defined amount, at which the radial forces and moments do not peril the intended life-time of the whole system. Taking an air-driven small-scale turbine as an exemplary application, a balancing device for small high speed rotors has been designed and characterized. The device is designed to allow rotational speeds up to 65 000 rpm. Based on dynamic force measurement using piezo-electric PZT stacks and digital lock-in-amplifiers, unbalance can be measured down to less than 1 mg·mm. In an iterative process, manual correction of the unbalance using a hand-operated rotary tool is verified and, if necessary, repeated. A key experiment shows, that an initial unbalance of 300 mg·mm can be reduced by a factor of more than 100, using the balancing device outlined above.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Pfeffer, Daniel and Klug, Florian and Schlaak, Helmut F. and Pott, Peter P.
Title: Design of a Balancing Device for Small High Speed Rotors
Language: English
Abstract:

An unbalance in high speed rotating machines leads to unwanted noise and vibration and thus to increased wear in bearings and higher friction losses. Therefore, it is desired to reduce the unbalance of the rotor to a well-defined amount, at which the radial forces and moments do not peril the intended life-time of the whole system. Taking an air-driven small-scale turbine as an exemplary application, a balancing device for small high speed rotors has been designed and characterized. The device is designed to allow rotational speeds up to 65 000 rpm. Based on dynamic force measurement using piezo-electric PZT stacks and digital lock-in-amplifiers, unbalance can be measured down to less than 1 mg·mm. In an iterative process, manual correction of the unbalance using a hand-operated rotary tool is verified and, if necessary, repeated. A key experiment shows, that an initial unbalance of 300 mg·mm can be reduced by a factor of more than 100, using the balancing device outlined above.

Uncontrolled Keywords: balancing, high speed rotor, piezo-stack, unbalance, lock-in-amplifier
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Microtechnology and Electromechanical Systems
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology
Event Title: ACTUATOR 2016, 15th International Conference on New Actuators & 9th Exhibition on Smart Actuators and Drive Systems
Event Location: Bremen, Germany
Event Dates: 13. - 15. Jun. 2016
Date Deposited: 05 Aug 2016 10:15
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