Stall protection based on back EMF detection

Details Stall protection based on back EMF detection Stall protection based on back EMF detection

2005-01-04

2005-01-04

Martin, David (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S254100, C318S430000, C318S432000

Reexamination Certificate

active

06838847

ABSTRACT:
A method of detecting a rotor condition of a dc motor is provided. The motor14is part of a motor control circuit10having a free-wheeling diode20in parallel with the motor14. The method establishes a threshold voltage for back emf voltage evaluation. The motor is energized to operate at a certain speed. Current is cut-off to the motor via a switch16for a time sufficient for current through the free-wheeling diode to decay to zero. The back emf voltage detected at leads of the motor is then compared via a comparator21to the threshold voltage.

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Designers' Guide to Power Products, Application Manual, 2ndEdition—SGS-Thomson Microelectronics, Jun. 1992, by Herbert Sax, p. 214-229.

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