ELEVATOR LINEAR PROPULSION SYSTEM WITH COOLING DEVICE

• US 20180215587A1
• Filed: 08/05/2016
• Published: 08/02/2018
• Est. Priority Date: 08/07/2015
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Ranjan, Ram, Manes, Enrico, Siewert, Bryan Robert, Piech, Zbigniew
• Granted Patent: US 11,001,477 B2
• Time in Patent Office: Days
• CPC Class Codes: B66B 11/0407 actuated by an electrical linear motor in the counterweight B66B17/12
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence
• CPC Class Codes: H02K 9/18 wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing
• CPC Class Codes: H02K 9/225 Heat pipes
• CPC Class Codes: H02K 9/227 Heat sinks

Abstract

An elevator system includes an elevator car constructed and arranged to travel in a hoistway. A linear propulsion system of the elevator system is configured to impart a force upon the elevator car to control movement of the car. The linear propulsion system includes a secondary portion mounted to the elevator car and having a plurality of magnets. A first primary portion of the linear propulsion system includes a mounting assembly, a plurality of coils engaged to the mounting assembly, and a first cooling device including at least one conduit projecting outward from the mounting assembly and into the hoistway for transferring heat.

Claims

1. An elevator system, comprising:

an elevator car constructed and arranged to travel in a hoistway; and

a linear propulsion system configured to impart force to the elevator car, the linear propulsion system including;

a first primary portion including a mounting assembly, a plurality of coils engaged to the mounting assembly, and

a first cooling device including at least one conduit loop at least partially embedded in the mounting assembly for flowing cooling fluid.

2. The elevator system set forth in claim 1, wherein the linear propulsion system includes a secondary portion mounted to the elevator car and including a plurality of magnets.

3. The elevator system set forth in claim 1, wherein the at least one conduit loop is partially embedded in a panel of the mounting assembly supporting the plurality of coils.

4. The elevator system set forth in claim 1, wherein the at least one conduit loop is partially in a cavity defined at least in part by a panel of the mounting assembly that supports the coils disposed in the cavity.

5. The elevator systems set forth in claim 1, wherein the at least one conduit loop is made of a material having a coefficient of thermal conductivity that is about greater than 100 watts per meter kelvin.

6. The elevator system set forth in claim 1 further comprising:

a rail disposed in and extending along the hoistway, and wherein the mounting assembly is engaged to the rail and the first cooling device includes a plurality of cooling fins projecting outward from the rail into the hoistway with the at least one conduit loop extending through each one of the plurality of cooling fins.

7. The elevator system set forth in claim 6, wherein each one of the plurality of cooling fins substantially extend vertically.

8. The elevator system set forth in claim 1, wherein the first cooling device includes a pump interposed in the at least one conduit loop for driving the cooling fluid flow.

9. The elevator system set forth in claim 1, wherein the cooling device includes a plurality of cooling fins located outside of the hoistway with the at least one conduit loop extending through each one of the plurality of cooling fins.

10. The elevator system set forth in claim 1 further comprising:

a rail disposed in and extending along the hoistway, and wherein the mounting assembly includes an electrically non-conductive panel engaged to the plurality of coils and a bracket engaged between the non-conductive panel and the rail with the at least one conduit loop partially embedded in the bracket.

11. The elevator system set forth in claim 1, wherein the cooling device includes a heat exchanger interposed with the at least one conduit loop.

12. The elevator system set forth in claim 11, wherein the heat exchanger is located outside of the hoistway.

13. The elevator system set forth in claim 11, wherein the heat exchanger is a liquid-to-liquid heat exchanger.

14. The elevator system set forth in claim 11, wherein the heat exchanger is a liquid-to-air heat exchanger and the cooling device includes a fan for moving air through the heat exchanger.

15. The elevator system set forth in claim 1 further comprising:

a second primary portion including a second cooling device including a plurality of heat pipes.

16. The elevator system set forth in claim 1 further comprising:

a second primary portion including a second cooling device including a plurality of solid conduits constructed and arranged to transfer heat conductively.

17. An elevator linear propulsion system comprising:

a substantially vertical rail;

a first primary portion including a plurality of first electrical coils, a first mounting assembly, and a first cooling device including a plurality of solid conduits constructed and arranged to conduct heat out of the first mounting assembly; and

a second primary portion including a plurality of second electrical coils, a second mounting assembly, and a second cooling device including at least one conduit loop for flowing cooling fluid, and wherein the at least one conduit loop extends partially through the mounting assembly for cooling the mounting assembly.

18. The elevator linear propulsion system set forth in claim 17, wherein the first and second primary portions are modular portions distributed along the rail.

19. The elevator linear propulsion system set forth in claim 18, wherein the first primary portion includes a duty cycle of about less than thirty percent and the second primary portion includes a duty cycle of about greater than thirty percent.

20. The elevator linear propulsion system set forth in claim 17, wherein the distribution of the first and second cooling devices is a function of elevator car duty cycle.

21. A method of operating an elevator system comprising:

operating an elevator car via a first primary portion having a duty cycle of greater than thirty percent; and

flowing cooling fluid through a conduit loop of a first cooling device for cooling electrical coils of the first primary portion.

22. The method set forth in claim 21 further comprising:

operating an elevator car via a second primary portion having a duty cycle of less than thirty percent; and

reducing temperature of a support assembly constructed and arrange to support electrical coils of the second primary portion via heat conduction through a plurality of conduits of a second cooling device.