Title:
METHOD AND DEVICE FOR PROTECTING REGENERATING RESISTOR OF SERVO MOTOR FOR DRIVING INVERTER
Document Type and Number:
WIPO Patent Application WO/1996/034450
Kind Code:
A1
Abstract:
A method and a device for protecting regenerating resistor by which a regenerating resistor is sufficiently protected from thermal damage caused by excessive regeneration by using both a thermostat and an analog simulation circuit in cooperation of their protection regions. A thermally-actuated switch (2) stops the power supply to a DC link (10) when the temperature of the regenerating resistor (5) becomes higher than a prescribed value. The analog simulation circuit (1) is provided with a charge/discharge circuit which performs charging/discharging in accordance with a regenerating pulse signal from a level detector (7), estimates the quantity of heat accumulated in the resistor (5), and stops the power supply to the link (10) when the estimated value exceeds a prescribed threshold. The fusing region of the resistor (5) is covered with at least either the protective region by the switch (2) or that by the circuit (1).
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Inventors:
SUZUKI NAOYUKI (JP)
HORIKOSHI SHINICHI (JP)
HORIKOSHI SHINICHI (JP)
Application Number:
PCT/JP1996/001185
Publication Date:
October 31, 1996
Filing Date:
April 30, 1996
Export Citation:
Assignee:
FANUC LTD (JP)
SUZUKI NAOYUKI (JP)
HORIKOSHI SHINICHI (JP)
SUZUKI NAOYUKI (JP)
HORIKOSHI SHINICHI (JP)
International Classes:
H02H5/04; H02H6/00; H02P3/18; H02P3/22; H02H7/122; (IPC1-7): H02P3/18; H02P3/101
Foreign References:
| JPS6013485A | 1985-01-23 | |||
| JPH0226340U | 1990-02-21 | |||
| JPH02211083A | 1990-08-22 | |||
| JPS63161886A | 1988-07-05 |
Other References:
See also references of EP 0773623A4
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