Electricity: motive power systems – Braking – Dynamic braking
Patent
1982-10-27
1984-11-06
Truhe, J. V.
Electricity: motive power systems
Braking
Dynamic braking
318 60, 318134, 318138, 318258, 318327, 360 71, 360 741, H02P 314, H02P 318
Patent
active
044814496
ABSTRACT:
A power fail circuit provides protection for tape such as used in the tape transport apparatus of a video recorder in the event of a failure of the external power supply. The tape transport apparatus includes as a feature the provision of an electrical error signal used to govern drive motors to maintain substantially constant tape tension when the system is operating normally. After power failure occurs, the power fail circuit continues to respond to the error signal by coupling current from the drive motors to provide dynamic braking. Further, current taken from the drive motors selectively is coupled to an energy storage device operatively associated with the system power supply, to provide augmenting energy from the kinetic energy of the motors for continued control of the power fail circuit as the drive motors are caused to decelerate under control to stop.
REFERENCES:
patent: 3117262 (1964-01-01), Mullin
patent: 3130357 (1964-04-01), Westlake et al.
patent: 3218529 (1965-11-01), Evans et al.
patent: 3463984 (1969-08-01), Ross et al.
patent: 3852731 (1974-12-01), Hollands
patent: 3879756 (1975-04-01), DeBell et al.
patent: 3942084 (1976-03-01), Louth
patent: 4027204 (1977-05-01), Norbeck
patent: 4031463 (1977-06-01), Norberg
patent: 4031464 (1977-06-01), Norberg
patent: 4156257 (1979-05-01), Roberts
Electronic Design, May 24, 1979, "One-Shot Serving as Missing Pulse Detector Spots Loss of AC Line Voltage Quickly".
Almeida George B.
Ampex Corporation
Ip Paul S. L.
Talcott Joel D.
Truhe J. V.
LandOfFree
Power fail servo system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power fail servo system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power fail servo system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1044116