Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1985-05-31
1987-10-13
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
340671, 494 7, 494 10, 73457, 318811, H02P 528
Patent
active
047001178
ABSTRACT:
A centrifuge overspeed protection and imbalance detection system is structured to provide a method for detecting rotor imbalance and rotor overspeed. The system has a single transducer to provide real-time data necessary to detect rotor imbalance and control motor speed.
Motor speed is controlled by synthesis of a drive frequency signal for driving the inverter motor control. The drive frequency signal may be inhibited to provide slow acceleration or deceleration, or to shut the motor off by providing a zero slip frequency. Motor control is responsive to a Rotor Identification circuit and operator programming, as well as a closed loop response to the real time tach signal.
Imbalance detection is provided by counting tach pulses in each of a plurality of intervals, detecting deviations in tach pulse rate and sounding an alarm when the irregularity of tach pulse signals exceeds the limits of a predetermined standard deviation.
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Sen et al, "Induction Motor Drives with Microcomputer Control System", Conference-IAS Annual Meeting, 1980, Cincinnati, OH, (28-Sep.-3 Oct. 1980).
Dewan et al.; "Slip Speed in an Induction Motor Drive with a Phase Locked Loop", Conference: Industry Applications Society-IEEE-IAS Annual Meeting, Cleveland, OH., (30 Sep.-4 Oct. 1979).
Moffat, et al., Digital Phase-Locked Loop for Induction Speed Control", IEEE Transactions on Industry Applications, vol. IA-15, No. 2, Mar./ Apr. 1979, pp. 176-182.
Sen et al., "Micro Processor Control of an Induction Motor with Flux Regulation", Conference: Industry Applications Society IEE-IAS Meeting, (1-5 Oct. 1978), pp. 664-668.
Giebeler Robert H.
Parkes Christopher W.
Beckman Instruments Inc.
Harder P. R.
May W. H.
Smith Jr. David
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