Adaptive overload protection of electric motors and static switc

Details Adaptive overload protection of electric motors and static switc Adaptive overload protection of electric motors and static switc

1989-12-22

1990-12-25

Shoop, Jr., William M.

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 31, H02P 738

Patent

active

049806246

ABSTRACT:
Protection apparatus for an AC or DC motor (4) and a static drive (8), including a static inverter or a static drive (8). An I.sup.2 T signal is modified to take account of the frequency with which the switching elements of the drive (8) are switching their load current (at 42) and other factors. The modified I.sup.2 T signal is lowpass filtered in a filter whose cutoff frequency is also a function of the drive's switching frequency. The resulting drive protection signal is compared with a predetermined threshold. An I.sup.2 T signal is also modified to take account of the speed of the motor and other factors, then filtered, to provide a motor-related signal (at 90). Upon occurrence of an overload both the drive-related signal and the motor-related signal are indpendently capable of turning off the system by tripping a line contactor (6).

REFERENCES:
patent: 4156162 (1979-05-01), Warfield et al.
patent: 4445075 (1984-04-01), Fry
patent: 4491775 (1985-01-01), Harvey et al.
patent: 4574226 (1986-03-01), Binder
patent: 4599548 (1986-07-01), Schultz
patent: 4810943 (1989-03-01), Kawaguchi et al.
patent: 4829218 (1989-05-01), Bauer
patent: 4831313 (1989-05-01), Beilfuss

Affiliated with

Also associated with

Rating

Adaptive overload protection of electric motors and static switc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive overload protection of electric motors and static switc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive overload protection of electric motors and static switc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1165244