Motor drive having dual inverter system connected to first and second stator sections

• US 10,532,911 B2
• Filed: 12/05/2013
• Issued: 01/14/2020
• Est. Priority Date: 12/05/2013
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Rodriguez, Fernando
• Primary Examiner(s): Salata, Anthony J
• Application Number:
  US15/100,766
• Publication Number:
  US 20160311656A1
• Time in Patent Office: 2,231 Days
• Field of Search: 187247, 187277, 187289, 187290, 187293, 187296, 187297, 187391, 187393, 318135, 318687, 318799, 318800-815, 104281-283, 104290, 310 1201, 310 1204, 310 1209, 310 1211, 310 1215, 363 34, 363 37, 363 40
• CPC Class Codes: B66B 1/30 effective on driving gear , e.g. acting on power electronics, on inverter or rectifier controlled motor
• CPC Class Codes: B66B 11/0407 actuated by an electrical linear motor in the counterweight B66B17/12
• CPC Class Codes: B66B 19/00 Mining-hoist operation
• CPC Class Codes: B66B 9/003 for lateral transfer of car or frame, e.g. between vertical hoistways or to/from a parking position
• CPC Class Codes: B66B 9/02 actuated mechanically otherwise than by rope or cable

Abstract

A linear propulsion system and method of assembling and testing the same. The linear propulsion system may comprise a track, a vehicle, a mover mounted to the vehicle, and a dual inverter system. The track may include a first plurality of stator sections interleaved with a second plurality of stator sections. The dual inverter system may include first and second multi-phase inverters (52a, 52b) that share input hardware.

Claims

1. A linear propulsion system comprising:

a track comprising a first plurality of stator sections and a second plurality of stator sections, the second plurality interleaved between the first plurality, each stator section including frame and a plurality of coils mounted on the frame, each stator section having an activated state and a deactivated state;

a vehicle;

a mover functionally mounted to the vehicle and disposed adjacent to the track, the mover including a plurality of magnets; and

a dual inverter system operably connected to each of the stator sections, the dual inverter system including;

first and second multi-phase inverters, the first inverter operably connected to the first plurality of stator sections, the second inverter operably connected to the second plurality of stator sections; and

a controller operably connected to the first and second multi-phase inverters,

wherein a propulsion force on the vehicle is generated when the mover is adjacent to one or more of the stator sections in the activated state.

2. The system of claim 1, wherein a length of the mover is about the same or shorter than the stator section.

3. The system of claim 1, in which the mover includes permanent magnets.

4. The system of claim 1, in which stator section includes a plurality of subsections arranged consecutively, each subsection including a plurality of coils, wherein a length of the mover is longer than each subsection but shorter than the stator section.

5. The system of claim 1, in which the dual inverter system further includes input hardware shared by and operably connected to the first and second multi-phase inverters.

6. The system of claim 5, in which the input hardware includes a filter.

7. The system of claim 5, in which the input hardware includes a pre-charge circuit that limits the initial current received by the first and second inverters from a power source.

8. The system of claim 5, in which the input hardware includes an AC to DC converter.

9. The system of claim 5, in which the input hardware includes a DC-link capacitor.

10. An elevator system comprising:

the linear propulsion system of claim 1;

wherein the vehicle comprises a car;

input hardware disposed between a power source and each of the first and second multi-phase inverters, the input hardware shared by the first and second multi-phase inverters; and

wherein when the first inverter is activated, a first stator section in the first plurality is energized and the interaction between the mover and the first stator section generates a propulsion force on the car in a vertical direction, and when the second inverter is activated, a second stator section in the second plurality is energized and the interaction between the mover and the second stator section generates a propulsion force on the car in a vertical direction.

11. The elevator system of claim 10, wherein, during propulsion of the car in a segment, the hardware utilization of the input hardware is in the range of about 95% to 100%.

12. The elevator system of claim 10, in which each stator section includes subsections, wherein a length of the mover is longer than each individual subsection.

13. The elevator system of claim 10, in which the input hardware includes sensors.

14. The elevator system of claim 10, wherein, when power is received from the first multi-phase inverter, a first stator section of the first plurality is activated but none of the second plurality of stators sections is activated.

15. The elevator system of claim 10, wherein, when power is received from the second multi-phase inverter, a second stator section of the second plurality is activated but none of the first plurality of stator sections is activated.

16. The elevator system of claim 10 further comprising a plurality of switches in a one-to-one correspondence with each of the stator sections, each switch disposed between the dual inverter system and one of the stator sections, each switch moveable between an open position and a closed position, wherein when the switch is in the closed position, the stator section is activated.

17. The elevator system of claim 10, wherein the mover includes permanent magnets.

18. The elevator system of claim 10, wherein the length of the mover is the same or shorter than each stator section.

19. The elevator system of claim 10, wherein each stator section comprises three subsections.