Integrated shaft sensor for load measurement and torque control in elevators and escalators
US6488128B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2000 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Dec 12, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/28
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator machine and control system includes a drive shaft with a motor and brake. A rope, usually a steel cable or belt, is attached at one end to an elevator car and at the other end to a counterweight. The rope is reeved around a traction sheave connected to the drive shaft. At least one torque sensor is integrated into the machine's drive shaft between the brake and the traction sheave. A controller operates the motor based in part upon a feedback signal received from the torque sensor. Depending on the location of the brake vis a vis the motor and traction sheave, either one sensor or two sensors are required to produce a feedback signal which is indicative of a load in the elevator car.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.