Method and apparatus for slowing back spin of a rod string of a

Details Method and apparatus for slowing back spin of a rod string of a Method and apparatus for slowing back spin of a rod string of a

1996-10-23

1998-10-20

Martin, David S.

Electricity: motive power systems

Braking

Dynamic braking

318375, 318760, H02P 300

Patent

active

058251430

ABSTRACT:
A method and apparatus for slowing back spin of a rod string of a progressing cavity pump powered by an electric motor when power is lost. Pulse direct current voltage into the windings of the electric motor powering the progressing cavity pump to magnetize a stator of the electric motor thereby reducing the rotational speed of a rotor of the electric motor and consequently the rotational speed of the back spinning rod string of the progressing cavity pump.

REFERENCES:
patent: 4195255 (1980-03-01), Guttmann
patent: 4410845 (1983-10-01), Lockyear
patent: 4476423 (1984-10-01), Mallick
patent: 4990844 (1991-02-01), Gritter et al.
patent: 5198734 (1993-03-01), Johnson
patent: 5551510 (1996-09-01), Mills
patent: 5653290 (1997-08-01), Bland
Article Watch for flying parts pp. 16 and 17 published in Occupational health and Safety Magazine May 1995.

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