Robot having isolated stator and encoder

Patent metadata

Field	Value
Publication number	US-10069371-B2
Application number	US-201715838819-A
Country	US
Kind code	B2
Filing date	Dec 12, 2017
Priority date	Apr 21, 2014
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An apparatus including a housing; a motor having a stator and a rotor, where the stator is connected to the housing; an environment barrier extending between the stator and the rotor; and a sealing system connecting the environment barrier with the housing. The sealing system includes a first seal interface and a second seal interface. The first seal interface connects to the housing at a first diameter which is at least partially less than or equal to an inner diameter of the stator. The second seal interface connects to the housing at a second diameter which is at least partially greater than or equal to an outer diameter of the stator.

First claim

What is claimed is:

1. An apparatus comprising:
a housing;
a motor comprising a stator and a rotor, where the stator is connected to the housing;
a position encoder comprising an encoder read head and an encoder disk, where the encoder read head is connected to the housing; and
an environment barrier connected to the housing, where the environment barrier comprises a one-piece member which extends between the stator and the rotor and which extends between the encoder read head and the encoder disk.

2. An apparatus as in claim 1 where a first end of the one-piece member forms part of a first seal interface, and where an opposite second end of the one-piece member forms part of a second seal interface.

3. An apparatus as in claim 2 where the second end of the one-piece sleeve member is resiliently deflected to spring load a seal of the second seal interface against the housing.

4. An apparatus as in claim 2 where the first seal interface comprises a concave pocket having a single corner in the housing, where the first end of the one-piece sleeve member compresses a first seal of the first seal interface towards the corner.

5. An apparatus as in claim 2 where the first end of the one-piece sleeve member presses a first seal in a first outward direction towards the housing, and where the second end of the one-piece sleeve member presses a second seal in a second inward direction towards the housing.

6. An apparatus as in claim 1 where the one-piece member has at least one bend of at least 60 degrees between opposite ends of the one-piece member, and where the at least one bend is spaced from the opposite ends.

7. An apparatus as in claim 6 where the at least one bend comprises a first bend of about 90 degrees and a second bend of about 40 degrees or more.

8. An apparatus as in claim 1 further comprising an environment chamber and a shaft connected to the rotor, where the rotor and the shaft are in communication with an environment of the environment chamber, and where the housing and the environment barrier separate the stator from the environment of the environment chamber.

9. An apparatus comprising:
a housing;
a first motor comprising a stator and a rotor, where the stator is connected to the housing;
a position encoder comprising an encoder read head and an encoder disk, where the encoder read head is connected to the housing; and
an environment barrier connected to the housing, where the environment barrier comprises a one-piece member which extends both between the stator and the rotor and between the encoder read head and the encoder disk, where the environment barrier has a first end at a first seal with the housing and a second end at a second seal with the housing.

10. An apparatus as in claim 9 where a first end of the one-piece member forms part of a first seal interface, and where an opposite second end of the one-piece member forms part of a second seal interface.

11. An apparatus as in claim 10 where the second end of the one-piece sleeve member is resiliently deflected to spring load a seal of the second seal interface against the housing.

12. An apparatus as in claim 10 where the first seal interface comprises a concave pocket having a single corner in the housing, where the first end of the one-piece sleeve member compresses a first seal of the first seal interface towards the corner.

13. An apparatus as in claim 10 where the first end of the one-piece sleeve member presses a first seal in a first outward direction towards the housing, and where the second end of the one-piece sleeve member presses a second seal in a second inward direction towards the housing.

14. An apparatus as in claim 9 where the one-piece member has at least one bend of at least 60 degrees between opposite ends of the one-piece member, and where the at least one bend is spaced from the opposite ends.

15. An apparatus as in claim 14 where the at least one bend comprises a first bend of about 90 degrees and a second bend of about 40 degrees or more.

16. An apparatus as in claim 9 further comprising an environment chamber and a shaft connected to the rotor, where the rotor and the shaft are in communication with an environment of the environment chamber, and where the housing and the environment barrier separate the stator from the environment of the environment chamber.

17. A method comprising:
connecting a motor to a housing, where the motor comprises a stator and a rotor, where the stator is connected to the housing;
connecting an encoder disk to the rotor and an encoder read head to the housing;
connecting an environment barrier to the housing, where the environment barrier comprises a one-piece member which extends both between the stator and the rotor and between the encoder read head and the encoder disk, where the environment barrier has a first end at a first seal with the housing and a second end at a second seal with the housing.

Assignees

• Persimmon Technologies Corp
• Persimmon Tech Corporation

Inventors

• Hosek Martin
• Hofmeister Christopher
• Poole Dennis

Classifications

• H02K16/00

  Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} · CPC title

• H02K11/21

  Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) · CPC title

• H02K5/128 Primary

  using air-gap sleeves or air-gap discs · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K11/22

  Optical devices · CPC title