Cargo handling system

Patent metadata

Field	Value
Publication number	US-9694978-B2
Application number	US-201514801596-A
Country	US
Kind code	B2
Filing date	Jul 16, 2015
Priority date	Jul 16, 2015
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

Disclosed is a cargo handling system, and a power drive unit (PDU) for a cargo handling system, wherein the PDU comprises a permanent magnet motor (PMM) and is designed to provide a first static restraint braking function effectuated by designing the PMM to have a high cogging torque, and a second dynamic control braking function effectuated by motor regeneration.

First claim

What is claimed is:

1. A cargo handling system comprising a power drive unit (PDU), said PDU comprising:
a permanent magnet motor (PMM) having a power drive function, a static restraint braking function, and a dynamic control braking function; and
a wheel component in power driving engagement with the PMM, wherein the PMM has a magnet component including a magnet pole arc of approximately between 120 and 160 electrical degrees.

2. The cargo handling system of claim 1 , wherein the PMM has a cogging torque of at least 16 ounce inches.

3. The cargo handling system of claim 2 , wherein the PMM has an output torque of at least 76 ounce inches.

4. The cargo handling system of claim 1 , wherein the dynamic control braking function comprises regenerative braking.

5. The cargo handling system of claim 1 , further comprising:
a tray comprising a plurality of transport rollers supported on said tray and retaining said PDU.

6. The cargo handling system of claim 5 , further comprising a cargo restraint device in said tray.

7. The cargo handling system of claim 1 , wherein the magnet pole arc is approximately 140 electrical degrees.

8. The cargo handling system of claim 1 , wherein the dynamic control braking function being triggered when the cargo handling system is in a powered off state.

9. The cargo handling system of claim 1 , wherein the PMM comprises a resistance load effectuating the dynamic control braking function.

10. The cargo handling system of claim 9 , wherein the dynamic control braking function comprises at least one of a linear increasing force or a non-linear increasing force.

11. A power drive unit (PDU), comprising:
a permanent magnet motor (PMM) including a power drive function, a first braking function, and a second braking function; and
a wheel component in power driving engagement with the PMM, wherein the first braking function comprises a static restraint braking function, and the second braking function comprises a dynamic control braking function, and wherein the PMM has a magnet component including a magnet pole arc of approximately between 120 and 160 electrical degrees.

12. The PDU of claim 11 , wherein the PMM has a cogging torque of at least 16 ounce inches.

13. The PDU of claim 12 , wherein the PMM has an output torque of at least 76 ounce inches.

14. The PDU of claim 11 , wherein the second braking function comprises regenerative braking.

15. The PDU of claim 11 , wherein the magnet pole arc is approximately 140 electrical degrees.

16. The PDU of claim 11 , wherein the PMM comprises a resistance load effectuating the second braking function.

17. The PDU of claim 16 , wherein the second braking function comprises a linear increasing force or a non-linear increasing force.

Assignees

• Goodrich Corp

Inventors

• Harms Scott
• Larson Walace Harold

Classifications

• H02P3/22

  by short-circuit or resistive braking · CPC title

• H02K7/10

  Structural association with clutches, brakes, gears, pulleys or mechanical starters · CPC title

• H02K26/00

  Machines adapted to function as torque motors, i.e. to exert a torque when stalled · CPC title

• B65G13/00 Primary

  Roller-ways (storage devices comprising roller-ways B65G1/02; endless-chain conveyors comprising load-supporting rollers B65G17/00; rollers or arrangements thereof B65G39/00) · CPC title

• B64D2009/006

  Rollers or drives for pallets of freight containers, e.g. PDU · CPC title