Method and apparatus for reducing gear backlash impacts in an el

Details Method and apparatus for reducing gear backlash impacts in an el Method and apparatus for reducing gear backlash impacts in an el

1984-11-26

1986-10-14

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 500

Patent

active

046167331

ABSTRACT:
Collision impacts between meshing gears in a speed reduction mechanism 11 of an elevator system due to backlash during transitions between power/driving and regenerative/driven modes of operation are reduced by detecting the actual or approaching separation of the gear teeth, and in response thereto temporarily reducing the motor torque to correspondingly reduce the equalized relative speed difference between the input and output shafts of the mechanism. Tooth separation may be detected by sensing a difference in amplitude between signals proportional to the input and output shaft speeds, equalized in accordance with the gear ratio, or by sensing a polarity change in the motor drive current. The motor torque may be reduced by the relay controlled switching of resistors 40, 43 in a speed controller to thereby convert the function of an operational amplifier 45 therein from a first order time lag circuit to an integrator.

REFERENCES:
patent: 2653291 (1953-09-01), Rice et al.
patent: 4030570 (1977-06-01), Caputo
patent: 4269286 (1981-05-01), Ishii et al.
patent: 4271931 (1981-06-01), Watanabe
patent: 4475631 (1984-10-01), Nomura

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