Variable frequency drive reflected wave suppressors

Details Variable frequency drive reflected wave suppressors Variable frequency drive reflected wave suppressors

1997-05-22

1998-07-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 58, 361111, 361118, 361 23, H02H 900

Patent

active

057842361

ABSTRACT:
The invention provides a circuit to protect an AC motor powered by a Variable Frequency Drive (VFD) from overvoltages caused by reflected waves. A full wave bridge rectifier circuit across the lines of the motor to be protected provides rectified voltage output to a capacitor, across which a low resistance discharge resistor in series with one or more zener diodes is attached. When an overvoltage above the clamping voltage of the zener diode(s) occurs across the protected lines, the zener diode(s) will conduct, causing the excess charge across the capacitor to discharge through the resistor until the voltage drops below the clamping voltage of the diode(s).

REFERENCES:
patent: 5444609 (1995-08-01), Swamy et al.
patent: 5610793 (1997-03-01), Luu
patent: 5646810 (1997-07-01), Funke
R. Kerman et al., "Interaction of Drive Modulation & Cable Parameters on AC Motor Transients", 1966, IEEE.
Swaney and Houdek, "Low Cost ASD Motor Protection Stops the Damage to Motors Due to ASD dv/dt Effects" Aug. 22, 1995.
Rockwell Automation, Allen-Bradley, "Effective Motor Protection Against Reflected Wave Phenomenon" May 1996.
Product Literature, TCI, Trans-Coil, Inc., Jun. 1996.

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