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| A Bandpass Active Filter Designed for Rapid unbalance Measurement |
| Zeng Sheng, Ren Yi, Li Chang-pin |
| Institute of Chemical Machinery, Zhejiang University, HangZhou 310027, China |
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Abstract In connection with the efficiency request of the unbalance measurement for the automatic rotor balancing machine, an 8th-order band-pass active filter is designed, which is compared experimentally with a 2nd-order low-pass active filter and a narrow band-pass tracing filter. The result demonstrates that the 2nd-order low-pass active filter has the characteristics of high measuring accuracy in the case of majority sampling loops, which may be used in the high accuracy requirement situation while the measurement efficiency is not so important. The repeatable accuracy of the narrow band-pass tracing filter is low, so it can only be used to the general balancing machine. In comparison, the 8th-order band-pass active filter hosts the high measuring accuracy, the high repeatability and the high efficiency, which can meet the measurement requirement of “Amplitude ±3mg, phase ±1ºand measurement time 5 seconds”
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Received: 15 March 2010
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Corresponding Authors:
Zeng Sheng
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2011, Vol. 30 
