Variable braking systems and devices

1. A brake roller assembly, comprising:

a shaft;

a first roller bearing coupled to the shaft and disposed at a first axial end of the shaft;

a second roller bearing coupled to the shaft and disposed at a second axial end of the shaft;

a roller cylinder disposed radially outward of the first roller bearing and the second roller bearing;

a cavity defined between the shaft and the roller cylinder, wherein the cavity is configured to receive a fluid; and

a braking arrangement, including:

a plurality of electrodes, and

a plurality of rotor disks coupled to the roller cylinder, each rotor disk in the plurality of rotor disks disposed between an anode in the plurality of electrodes and a cathode in the plurality of electrodes.

2. The brake roller assembly of claim 1 , wherein the fluid is an electro-rheological fluid.

3. The brake roller assembly of claim 1 , further comprising a stator disk having a piezoelectric material, wherein the piezoelectric material is configured to act as a power source for the plurality of electrodes.

4. The brake roller assembly of claim 1 , wherein the anode and the cathode are configured to create an electric field therebetween.

5. The brake roller assembly of claim 1 , further comprising a plurality of skewed rollers, wherein each rotor disk in the plurality of rotor disks is disposed between a first skewed roller in the plurality of skewed rollers and a second skewed roller in the plurality of skewed rollers.

6. The brake roller assembly of claim 1 , further comprising an axle disposed radially outward from the shaft and radially inward from the roller cylinder.

7. The brake roller assembly of claim 6 , wherein the plurality of electrodes are coupled to the axle.