Donald B Mcpherson

US Patent:

46746056, Jun 23, 1987

Filed:

Apr 18, 1986

Appl. No.:

6/853600

Inventors:

Donald G. McPherson - Westminster CO

Assignee:

Otis Elevator Company - Farmington CT

International Classification:

G01G 1914

US Classification:

187131

Abstract:

An empty elevator car is caused to lift a predetermined calibration weight(s) located above the normal car excursion. The car load sensor signals before and after lifting the calibration weight together with the known values for the empty car weight and the calibration weight are used to recalibrate the load versus signal function.

US Patent:

47519843, Jun 21, 1988

Filed:

May 3, 1985

Appl. No.:

6/730228

Inventors:

Walter L. Williams - Denver CO
Donald G. McPherson - Westminster CO
Arnold Mendelsohn - Simsbury CT

Assignee:

Otis Elevator Company - Farmington CT

International Classification:

B66B 130

US Classification:

187116

Abstract:

Elevator velocity profile generation is based upon combining an open loop, least time profile for acceleration with a precision closed loop, phase plane control for deceleration. The deceleration phase-plane velocity profile is generated as a modified mirror image of the acceleration profile, and transition from open loop control is within ride quality constraints. Adaptive control permits operating a drive unit closer to its limits without danger of overloading under worst case conditions, which account for a small percentage of the time. Thus, smaller drive units can be used in a given application with minimal impact on performance.