Boots – shoes – and leggings
Patent
1985-03-04
1988-05-10
Lall, Parshotam S.
Boots, shoes, and leggings
318245, 318490, 324177, G01P 342, G06F 15332
Patent
active
047440414
ABSTRACT:
Disclosed is a DC parameter motor tester based on current time response, which tester does not require coupling of the motor (14) to some mechanical device or measuring other noise sensitive parameters taken from only a few discrete data points. As is disclosed, the steady state speed of the motor is determined from the frequency composition of the commutation noise and ripple in the steady state current by performing a fast fourier transform on the steady state current to determine its power-spectral-density which shows the frequency composition of the steady state current waveform by giving the power in the waveform at each frequency. The frequency at which the most power exists is divided by the number or twice the number, depending upon the construction of the motor, of commutation segments in the motor to determine the motor's frequency of rotation or velocity at measured power input. The parameters which are derived from the current time response points are taken from data in which such data has a significant, if not dominant influence.
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Lord et al, "Pasek's Technique for Determining the Parameters of High Performance DC Motors", May 1974, pp. 1-10.
Poussart et al, "Rapid Measurement of System Kinetics-An Instrument for Real-Time Transfer Function Analysis", Proceedings of the IEEE, vol. 65, No. 5, pp. 741-747, May, 1977.
"A Frequency Response Method for Determining the Parameters of High-Performance DC Motors" by R. A. Schulz, IEEE Transactions on Industrial Electronics, vol. 1E-30, No. 1, pp. 39-42, Feb. 1983.
Strunk Timothy L.
Westerman Glenn S.
Brady John A.
Dick William J.
International Business Machines - Corporation
Lall Parshotam S.
Mattson Brian M.
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