Elevator system including a permanent magnet (PM) synchronous motor drive system

Patent metadata

Field	Value
Publication number	US-11078049-B2
Application number	US-201615750964-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 7, 2015
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

An elevator drive system ( 40 ) includes a permanent magnet (PM) synchronous electric motor ( 34 ) including a plurality of phases and a plurality of motor drives ( 55, 58 ) electrically connected to the PM synchronous electric motor. Each of the plurality of motor drives is operatively connected to a corresponding one of the plurality of phases. The plurality of motor drives is configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases.

First claim

What is claimed is:

1. An elevator drive system comprising:
a permanent magnet (PM) synchronous electric motor including a plurality of phases; and
a plurality of motor drives electrically connected to the PM synchronous electric motor, each of the plurality of motor drives being operatively connected to a corresponding one of the plurality of phases, the plurality of motor drives being configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases;
wherein one of the plurality of motor drives is designated as a primary motor drive and remaining ones of the plurality of motor drives are designated as secondary motor drives.

2. The elevator drive system according to claim 1 , wherein the primary motor drive is configured and disposed to establish a field orientation angle for each of the secondary motor drives.

3. The elevator drive system according to claim 1 , wherein the primary motor drive is solely responsible for controlling velocity of the PM synchronous electric motor.

4. The elevator drive system according to claim 1 , wherein the primary motor drive is solely responsible for controlling braking of the PM synchronous electric motor.

5. The elevator drive system according to claim 1 , wherein the primary motor drive and one or more secondary motor drives are responsible for controlling braking of the PM synchronous electric motor.

6. The elevator drive system according to claim 1 , wherein the PM synchronous electric motor includes at least three (3) phases.

7. The elevator drive system according to claim 6 , wherein the PM synchronous electric motor includes at least six (6) phases.

8. The elevator drive system according to claim 7 , wherein the PM synchronous electric motor includes at least nine (9) phases.

9. An elevator drive system comprising:
a permanent magnet (PM) synchronous electric motor including a plurality of phases; and
a plurality of motor drives electrically connected to the PM synchronous electric motor, each of the plurality of motor drives being operatively connected to a corresponding one of the plurality of phases, the plurality of motor drives being configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases;
wherein the PM synchronous electric motor includes at least twelve (12) phases.

10. The elevator drive system according to claim 1 , wherein each of the plurality of phases is independent of others of the plurality of phases.

11. The elevator drive system according to claim 10 , wherein each of the plurality of phases includes an independent ground.

12. An elevator system comprising:
a hoistway;
a car movably arranged with the hoistway; and
an elevator drive system operatively connected to the car, the drive system comprising:
a permanent magnet (PM) synchronous electric motor operatively connected to the car, the PM synchronous electric motor including a plurality of phases; and
a plurality of motor drives electrically connected to the PM synchronous electric motor, each of the plurality of motor drives being operatively connected to a corresponding one of the plurality of phases, the plurality of motor drives being configured and disposed to equally deliver torque current to each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases;
wherein one of the plurality of motor drives is designated as a primary motor drive and remaining ones of the plurality of motor drives are designated as secondary motor drives.

13. The elevator system according to claim 12 , wherein the primary motor drive is configured and disposed to establish a field orientation angle for each of the secondary motor drives.

14. The elevator system according to claim 12 , wherein the primary motor drive is solely responsible for controlling velocity of the PM synchronous electric motor.

15. The elevator system according to claim 12 , wherein the primary motor drive is solely responsible for controlling braking of the PM synchronous electric motor.

16. The elevator system according to claim 12 , wherein the primary motor drive and one or more secondary motor drives are responsible for controlling braking of the PM synchronous electric motor.

17. The elevator system according to claim 12 , wherein the PM synchronous electric motor includes at least three (3) phases.

18. The elevator system according to claim 17 , wherein the PM synchronous electric motor includes at least six (6) phases.

19. The elevator system according to claim 18 , wherein the PM synchronous electric motor includes at least nine (9) phases.

20. The elevator system according to claim 19 , wherein the PM synchronous electric motor includes at least twelve (12) phases.

21. The elevator system according to claim 12 , wherein each of the plurality of phases is independent of others of the plurality of phases.

22. The elevator system according to claim 21 , wherein each of the plurality of phases includes an independent ground.

Assignees

• Otis Elevator Co

Inventors

• Piedra Edward D

Classifications

• B66B1/308 Primary

  with AC powered elevator drive · CPC title

• B66B11/043 Primary

  actuated by rotating motor; Details, e.g. ventilation (roping on drum, sheave, winch or pulley B66B11/0065; power supply or control B66B1/28, H02P; motor construction H02K) · CPC title

• B66B1/32

  effective on braking devices {, e.g. acting on electrically controlled brakes (brake control H02P, lift brakes per se B66B5/02)} · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title

• H02P21/36

  Arrangements for braking or slowing; Four quadrant control · CPC title