Self-propelled elevator system having windings proportional to car velocity

Patent metadata

Field	Value
Publication number	US-2016137459-A1
Application number	US-201314897106-A
Country	US
Kind code	A1
Filing date	Jun 27, 2013
Priority date	Jun 27, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

An elevator system includes a hoistway; an elevator car to travel in the hoistway; permanent magnets mounted to the elevator car; and primary windings mounted in the hoistway, the primary windings having a first section having a first number of turns and a second section having a second number of turns, wherein the first number of turns is less than the second number of turns.

First claim

1 . An elevator system comprising:
a hoistway; an elevator car to travel in the hoistway; permanent magnets mounted to the elevator car; and primary windings mounted in the hoistway, the primary windings having a first section having a first number of turns and a second section having a second number of turns, wherein the first number of turns is less than the second number of turns.

2 . The elevator system of claim 1 wherein:
the elevator car travels in the first section at a first velocity and the elevator car travels in the second section at a second velocity, the first velocity being greater than the second velocity.

3 . The elevator system of claim 2 wherein:
the first section is driven by a first coil current and the second section is driven by a second coil current, the first coil current being greater than the second coil current.

4 . The elevator system of claim 3 wherein:
the first number of turns multiplied by the first coil current is substantially equal to the second number of turns multiplied by the second coil current.

5 . The elevator system of claim 1 wherein:
the first section corresponds to one floor of the hoistway.

6 . The elevator system of claim 1 wherein:
the first section corresponds to multiple floors of the hoistway.

7 . The elevator system of claim 1 wherein:
the first section corresponds to less than one floor of the hoistway.

8 . The elevator system of claim 1 further comprising:
first power electronics providing first coil current to the first section; and
second power electronics providing second coil current to the second section.

9 . The elevator system of claim 8 wherein:
the second power electronics have a lower current rating than the first power electronics.

10 . An elevator system comprising:
a hoistway; an elevator car to travel in the hoistway; permanent magnets mounted to the elevator car; and primary windings mounted in the hoistway, the primary windings having a plurality of sections; wherein a coil current in each section is proportional to elevator car velocity in a respective section and a number of turns in each section is inversely proportional to elevator car velocity in the respective section.

11 . The elevator system of claim 10 wherein:
the number of turns multiplied by the coil current is substantially equal for each section.

12 . A method for establishing primary windings in a self-propelled elevator system, the method comprising:
determining a first section of the primary windings where the elevator car travels at a first velocity; assigning a first number of turns and a first coil current to the first section; determining a second section of the primary windings where the elevator car travels at a second velocity, the second velocity lower than the first velocity; and assigning a second number of turns and a second coil current to the second section, wherein the second number of turns is greater than the first number of turns and the first coil current is greater than the second coil current.

13 . A propulsion system comprising:
a traveling component; permanent magnets mounted to the traveling component; and primary windings to impart force to the traveling component, the primary windings having a plurality of sections; wherein a coil current in each section is proportional to traveling component velocity in a respective section and a number of turns in each section is inversely proportional to traveling component velocity in the respective section.

14 . A propulsion system, comprising:
a stationary guide having a plurality of sections including at least a first section and a second section,
the first section having a first winding comprising a first plurality of turns,
the second section having a second winding comprising a second plurality of turns, and
wherein the first plurality of turns comprises less turns than the second plurality of turns;
a movable portion configured to move along the stationary guide, the movable portion comprising a plurality of permanent magnets; a power source to provide a first current to the first winding; and a second power source to provide a second current to the second winding; wherein a product of the first current and a number of turns in the first plurality of turns is substantially equal to a product of the second current and a number of turns in the second plurality of turns.

15 . The propulsion system of claim 14 wherein:
the movable portion travels in the first section at a first velocity and the movable portion travels in the second section at a second velocity, the first velocity being greater than the second velocity.

16 . The propulsion system of claim 15 wherein:
the first current is greater than the second current.

17 . The propulsion system of claim 14 wherein:
the second power source has a lower current rating than the power source.

Assignees

• Otis Elevator Co

Inventors

• Rodriguez Fernando

Classifications

• B66B11/0407 Primary

  actuated by an electrical linear motor (in the counterweight B66B17/12) · CPC title

• H02K41/031

  of the permanent magnet type · CPC title