Magnetic elevator drive member and method of manufacture

Patent metadata

Field	Value
Publication number	US-10587180-B2
Application number	US-201615154148-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	May 13, 2016
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

An illustrative example embodiment of a method of making a rotary magnetic drive member includes establishing a plurality of magnet retainers on a rod using an additive manufacturing process. Magnets are inserted between the retainers with magnetic poles of axially adjacent ones of the magnets oriented with like poles facing toward a portion of one of the retainers between the adjacent ones of the magnets.

First claim

I claim:

1. A method of making a rotary magnetic drive member, the method comprising:
establishing a plurality of magnet retainers on a rod using wire arc additive manufacturing; and
inserting magnets between the magnet retainers with magnetic poles of axially adjacent ones of the magnets oriented with like poles facing toward a portion of one of the magnet retainers between the adjacent ones of the magnets, wherein inserting the magnets comprises
positioning at least one of the magnets at least partially in a gap between ends of the magnet retainers near one end of the rod and
moving the at least one of the magnets within the gap in a helical direction along the rod toward an opposite end of the rod into a desired location.

2. The method of claim 1 , wherein the magnet retainers comprise a magnetic material.

3. The method of claim 2 , wherein the magnetic material comprises low carbon steel.

4. The method of claim 1 , comprising shaping the magnet retainers to include a retention feature on the magnet retainers, the retention feature maintaining the magnets near the rod.

5. The method of claim 4 , wherein
shaping the magnet retainers comprises removing a portion of the magnet retainers to establish a first axial distance between the magnet retainers distal from the rod and a second axial distance between the magnet retainers near the rod; and
the first axial distance is smaller than the second axial distance.

6. The method of claim 5 , wherein removing the portion of the magnet retainers comprises machining away the portion of the magnet retainers.

7. The method of claim 4 , wherein shaping the magnet retainers comprises providing the magnet retainers with a dovetail shaped cross-section.

8. The method of claim 1 , wherein establishing the plurality of magnet retainers comprises arranging the magnet retainers in a helical arrangement on the rod.

9. The method of claim 1 , comprising
sequentially performing the positioning for each of the magnets; and
subsequent to positioning at least some of the magnets, moving the at least some of the magnets simultaneously within the gap in the helical direction along the rod.

10. The method of claim 1 , wherein the rod comprises a non-magnetic material.

11. The method of claim 10 , wherein the rod comprises a hollow cylinder.

12. The method of claim 1 , wherein the magnets comprise a ceramic compound.

13. The method of claim 1 , wherein the magnets comprise rare earth magnets.

Assignees

• Otis Elevator Co

Inventors

• Fargo Richard N

Classifications

• B66B11/0438

  with a gearless driving, e.g. integrated sheave, drum or winch in the stator or rotor of the cage motor · CPC title

• H02K15/03

  having permanent magnets · CPC title

• B23K9/173

  and of a consumable electrode · CPC title

• B23K2103/04

  Steel {or steel} alloys · CPC title

• B66B9/025

  by screw-nut drives · CPC title