Centrifuge overspeed protection and imbalance detection system

Details Centrifuge overspeed protection and imbalance detection system Centrifuge overspeed protection and imbalance detection system

G - Physics

01

M

73/165, 341/91

G01M 1/14 (2006.01) B04B 9/14 (2006.01) B04B 13/00 (2006.01) H02H 7/093 (2006.01)

Patent

CA 1268055

CENTRIFUGE OVERSPEED PROTECTION AND IMBALANCE DETECTION SYSTEM 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.

509849

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