B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/27
B66B 1/44 (2006.01) B66B 1/28 (2006.01) B66D 1/12 (2006.01)
Patent
CA 1290476
ABSTRACT: This control device suppresses the jerk (or jolt) at the start-up of speed controlled elevator installations in both directions of travel, not only the friction jerk (or jolt) at the transition from the static friction (RH) to the sliding friction (RG) but also the imbalance jerk (or jolt) at unbalanced car load. For this a nominal value multiplier (39) is connected to the output side of a nominal value transmitter (14) in the drive control; the multiplying factor m (of the multiplier (39) ) can be con trolled by way of an on-/off circuit (46) and the multiplier (91) and is switched, prior to the start of the movement, by the flow control (21) to a value > 1 and at start of movement in the di- rection of travel by the motion detector (16) again to the value 1. From this there results for the customary nominal start-up curve (92) an increase of the initial range (?). By m >1 the monotonically rising correction curve (97) is chosen here in such a way, that with the monotonically dropping correction curve (98) the motor driving power is reduced at the start of the move- ment in synchronism with the friction resistance and an initial sagging respectively jerking up of the elevator car against the direction of travel because of the rapid run-up of the motor driving force is prevented to a great extent. The corresponding actual-start-up curve (99) exhibits in comparison to the custom- ary actual-start-up curve (93) an earlier beginning of the move- ment t3 and has a horizontal start-up tangent (100) and thus jerk (or jolt) free start-up without a transient process (94). This suppression of jerks (or jolts) is eminently suitable for the ulterior fitting of controlled elevator drives and increases, due to the earlier start of movement, their elevating capacity. (figures 7a, 7b)
567479
Klingbeil Klaus-Jurgen
Woyciel Horst
Ag Inventio
Riches Mckenzie & Herbert Llp
LandOfFree
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