Linear induction motor-driven divert mechanisms

• US 9,108,807 B1
• Filed: 12/17/2013
• Issued: 08/18/2015
• Est. Priority Date: 12/17/2013
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Ogle, David Arthur II
• Primary Examiner(s): Bidwell, James R
• Application Number:
  US14/108,870
• Time in Patent Office: 609 Days
• Field of Search: 198/370.01, 198/370.03, 198/370.13, 198/371.2, 198/371.3, 198/690.1, 193/35.MD
• US Class Current: 1/1
• CPC Class Codes: B65G 39/025 having spherical roller elements
• CPC Class Codes: B65G 47/46 and distributing, e.g. automatically, to desired points in tube mail systems B65G51/36
• CPC Class Codes: B65G 47/53 between conveyors which cross one another
• CPC Class Codes: B65G 47/82 Rotary or reciprocating members for direct action on articles or materials, e.g. pushers, rakes, shovels means for pushing glass articles onto a conveyor C03B9/453
• CPC Class Codes: B65G 54/02 electrostatic, electric, or magnetic

Abstract

Linear induction motor-driven divert mechanisms may be installed or associated with conveying systems and may cause a change in velocity of one or more objects (i.e., a change in direction and/or a change in speed) to passing through the conveying systems. The divert mechanisms may include one or more spherical rotors including magnetizable slugs, and the spherical rotors may be rotatably positioned above positioned above one or more stator plates. Energizing one or more of the stator plates causes the corresponding spherical rotors to rotate in a given direction. Therefore, the divert mechanism may be used to transport or direct objects within conveying systems by controlling the rotation and angular velocity of one or more of the spherical rotors, which may impart motion to the objects.

Claims

1. A conveyor system comprising:

an ingress conveyor;

at least one egress conveyor; and

a linear induction motor-driven divert mechanism comprising;

a plurality of spherical rotors rotatably positioned between an upper frame and a nesting table; and

a power table having a stator plate associated with each of the plurality of spherical rotors;

wherein the power table is positioned beneath the nesting table, and

wherein each of the spherical rotors is adapted to rotate about an axis upon an application of alternating current to a stator plate corresponding to the spherical rotor.

2. The conveyor system of claim 1, wherein an angular velocity of the rotation of each of the spherical rotors is determined based at least in part on a frequency of the alternating current applied to the stator plate associated with the spherical rotor.

3. The conveyor system of claim 1, wherein the linear induction motor-driven divert mechanism is configured in series between the ingress conveyor and the at least one egress conveyor, and

wherein the linear induction motor-driven divert mechanism is adapted to receive objects from the ingress conveyor, to pass the objects over at least one of the spherical rotors, and to direct the objects in a direction of the at least one egress conveyor.

4. The conveyor system of claim 1, wherein the spherical rotor is formed from a paramagnetic material, and

wherein the spherical rotor comprises a plurality of rotor slugs evenly distributed about a center of the spherical rotor.

5. A conveying system comprising:

a linear induction motor-driven conveying apparatus comprising a plurality of spherical rotors and a plurality of stator plates,

wherein each of the stator plates is positioned beneath one of the spherical rotors, and

wherein two or more of the plurality of spherical rotors are adapted to rotate about parallel axes upon energizations of the stator plates associated with the two or more spherical rotors.

6. The conveying system of claim 5, wherein the two or more spherical rotors are adapted to rotate about the parallel axes upon the energizations of the stator plates associated with the two or more spherical rotors with alternating current, and

wherein an angular velocity of the two or more spherical rotors is based at least in part on a frequency of the alternating current.

7. The conveying system of claim 5, further comprising an ingress conveyor aligned to transport objects to the linear induction motor-driven conveying apparatus.

8. The conveying system of claim 6, further comprising a variable frequency drive controller for controlling the frequency of the alternating current.

9. The conveying system of claim 5, further comprising at least one egress conveyor aligned to receive objects from the linear induction motor-driven conveying apparatus.

10. The conveying system of claim 5, wherein the plurality of spherical rotors comprises a first group of spherical rotors and a second group of spherical rotors,

wherein each of the first group of spherical rotors is adapted to rotate about parallel axes upon an energization of each of a first group of stator plates positioned beneath the first group of spherical rotors, and

wherein each of the second group of spherical rotors is adapted to rotate about parallel axes upon an energization of each of a second group of stator plates positioned beneath the second group of spherical rotors.

11. The conveying system of claim 10, wherein the stator plates of the first group comprise at least one conductor oriented along a first axis, and

wherein the stator plates of the second group comprise at least one conductor oriented along a second axis.

12. The conveying system of claim 5,

wherein each of the two or more of the plurality of spherical rotors comprises an inner sphere having a plurality of magnetizable rotor slugs mounted therein, and

wherein each of the magnetizable rotor slugs is distributed about a center of the inner sphere.

13. The conveying system of claim 12,

wherein each of the two or more of the plurality of spherical rotors further comprises an outer layer surrounding the inner sphere.

14. The conveying system of claim 12,

wherein the inner sphere is formed of a paramagnetic material, and

wherein the magnetizable rotor slugs are formed from at least one of iron, steel, nickel or a rare Earth magnet.

15. A conveying system comprising:

a linear induction motor-driven conveying apparatus comprising a spherical rotor, a stator plate associated with the spherical rotor, an upper frame and a nesting table,

wherein the spherical rotor is rotatably provided between an opening of the upper frame and a cavity in the nesting table,

wherein the spherical rotor is adapted to rotate about a predetermined axis upon an energization of the stator plate with alternating current, and

wherein an angular velocity of the spherical rotor is based at least in part on a frequency of the alternating current.

16. The conveying system of claim 15,

wherein at least one of the upper frame or the nesting table is formed of a paramagnetic material.

17. A method for conveying objects comprising:

providing a conveying system comprising a linear induction motor-driven divert mechanism in series between an ingress and a plurality of egresses, wherein the divert mechanism comprises a plurality of spherical rotors rotatably positioned above a plurality of stator plates;

selecting a first one of the plurality of egresses;

selecting a first group of the plurality of spherical rotors for directing objects to the first egress;

applying an alternating current in a given polarization to at least one of the stator plates corresponding to the first group of spherical rotors, wherein the alternating current causes the first group of spherical rotors to rotate about parallel or collinear axes at an angular velocity defined at least in part on a frequency of the alternating current;

transporting at least one object from the ingress to the divert mechanism; and

causing the at least one object to be directed to the first egress.

18. The method of claim 17, further comprising:

selecting a second one of the plurality of egresses;

selecting a second group of the plurality of spherical rotors for directing objects to the second egress;

securing the alternating current to the at least one of the stator plates corresponding to the first group of spherical rotors;

applying an alternating current in a given polarization to at least one of the stator plates corresponding to the second group of spherical rotors, wherein the alternating current causes the second group of spherical rotors to rotate about parallel or collinear axes at an angular velocity defined at least in part on a frequency of the alternating current;

transporting at least one object from the ingress to the divert mechanism; and

causing the at least one object to be directed to the second egress.