Non-contacting and torquer brake mechanism

Claim 2

A brake mechanism comprising: an inner assembly including a pair of spaced apart inner ferromagnetic pole structures, each inner pole structure including a plurality of inner salient ferromagnetic poles extending radially outwards; and an outer assembly surrounding the inner assembly, the outer assembly including a pair of spaced apart outer ferromagnetic pole structures, each outer pole structure including a plurality of outer salient ferromagnetic poles extending radially inwards towards the inner assembly; one of the inner and outer assemblies further including a flux source between its pole structure pair; the other of the inner and outer assemblies further including a ferromagnetic bridge between its pole structure pair; magnetic air gaps being defined by outer surfaces of the inner and outer poles when the outer surfaces of the inner and outer poles are in opposing relationships.

Claim 3

The mechanism of claim 1, wherein the flux source includes a permanent magnet.

Claim 4

The mechanism of claim 1, wherein the flux source includes an electromagnet.

Claim 5

The mechanism of claim 3, further comprising means for controlling an excitation current supplied to a coil of the electromagnet.

Claim 6

The mechanism of claim 1, wherein the assembly including the bridge is made solid.

Claim 7

The mechanism of claim 1, wherein the inner assembly is securable to a shaft, whereby the inner assembly is rotatable relative to the outer assembly.

Claim 8

The mechanism of claim 1, wherein the poles define interpole spaces, and wherein the interpole spaces are filled with a non-ferromagnetic material.

Claim 9

The mechanism of claim 1, wherein the poles define interpole spaces, and wherein the poles and the interpole spaces span equal arcuate distances.

Claim 10

An assembly for a non-contacting brake mechanism, the assembly comprising: a first pole structure including a first ferromagnetic disc and a plurality of first salient ferromagnetic poles extending from the first disc in a radial direction; a second pole structure including a second ferromagnetic disc and a plurality of second salient ferromagnetic poles extending from the second disc in a radial direction wherein the poles define interpole spaces; and an annular flux source between the first and second pole structures, the annular flux source providing flux between the first and second pole structures.

Claim 11

An assembly for a non-contacting brake mechanism, the assembly comprising: a first pole structure including a first ferromagnetic disc and a plurality of first salient ferromagnetic poles extending from the first disc in a radial direction; a second pole structure including a second ferromagnetic disc and a plurality of second salient ferromagnetic poles extending from the second disc in a radial direction wherein the poles define interpole spaces; and an annular flux source between the first and second pole structures, the annular flux source providing flux between the first and second pole structures.

Claim 12

The assembly of claim 9, wherein the first and second discs have inner perimeters, and wherein the first and second poles extend radially inward from the inner perimeters of the first and second discs.

Claim 13

The assembly of claim 9, wherein the annular flux source includes an electromagnet.

Claim 14

The assembly of claim 9, wherein the annular flux source includes a permanent magnet.

Claim 15

The assembly of claim 9, wherein the interpole spaces are filled with a non-ferromagnetic material.

Claim 16

The assembly of claim 9, wherein a cylinder surrounds the first and second poles such that an inner surface of the cylinder and outer surfaces of the first and second poles define magnetic air gaps.

Claim 17

A power drive unit of a cargo roller assembly, the power drive unit comprising: a transmission; an electric motor having a shaft coupled to the transmission; and a brake mechanism, the brake mechanism including an inner assembly secured to the shaft and an outer assembly surrounding the inner assembly, the inner assembly including a pair of inner ferromagnetic pole structures, both inner pole structures including inner salient ferromagnetic poles extending radially outward towards the outer assembly, the inner assembly further including a ferromagnetic bridge between the inner pole structures; the outer assembly including a pair of outer ferromagnetic pole structures, both outer pole structures including outer salient ferromagnetic poles extending radially inwards towards the inner assembly; the outer assembly further including a flux source between the outer pole structures; magnetic air gaps being defined by outer surfaces of the inner and outer poles when the outer surfaces of the inner and outer poles are in opposing relationships.

Claim 18

A power drive unit of a cargo roller assembly, the power drive unit comprising: a transmission; an electric motor having a shaft coupled to the transmission; and a brake mechanism, the brake mechanism including an inner assembly secured to the shaft and an outer assembly surrounding the inner assembly, the inner assembly including a pair of inner ferromagnetic pole structures, both inner pole structures including inner salient ferromagnetic poles extending radially outward towards the outer assembly, the inner assembly further including a ferromagnetic bridge between the inner pole structures; the outer assembly including a pair of outer ferromagnetic pole structures, both outer pole structures including outer salient ferromagnetic poles extending radially inwards towards the inner assembly; the outer assembly further including a flux source between the outer pole structures; magnetic air gaps being defined by outer surfaces of the inner and outer poles when the outer surfaces of the inner and outer poles are in opposing relationships.

Claim 19

The unit of claim 15, wherein the flux source includes a permanent magnet.

Claim 20

The unit of claim 15, wherein the flux source includes an electromagnet.

Claim 21

The unit of claim 17, further comprising means for controlling an excitation current supplied to a coil of the electromagnet.

Claim 22

The unit of claim 15, wherein the poles define interpole spaces, and wherein the interpole spaces are filled with a non-ferromagnetic material.

Claim 23

The unit of claim 15, wherein the poles define interpole spaces, and wherein the poles and the interpole spaces span equal arcuate distances.