Controllable brake

Abstract

An adjustable resistive device includes a first ring, a second ring, a rotating shaft, multiple permanent magnets, multiple electromagnets, two resistance discs, and two magnetorheological fluid layers. The second ring connects to the first ring and forms an outer space. The rotating shaft rotatably passes through the first and second rings. The multiple permanent magnets are spaced apart in the outer space and positioned between the first and second rings. The multiple electromagnets are located in the outer space, and each electromagnet contacts an adjacent set of permanent magnets. The two resistance discs are fitted onto opposite ends of the rotating shaft and are located within the first and second rings, respectively. The two magnetorheological fluid layers are respectively disposed in the first and second rings, and each magnetorheological fluid layer contacts its respective resistance disc.

Claims

1. An adjustable resistance device, comprising: The first component; A second ring component connects to the first ring component and forms an outer space; A rotating shaft is rotatably disposed through the first ring and the second ring; a plurality of permanent magnets are spaced apart in the peripheral space and located between the first ring and the second ring; a plurality of electromagnets are located in the peripheral space and each electromagnet contacts the adjacent permanent magnets; two resistance discs are sleeved on opposite ends of the rotating shaft and are respectively located in the first ring and the second ring; and two magnetorheological fluid layers are respectively disposed in the first ring and the second ring, and each magnetorheological fluid layer contacts each resistance disc.

2. The adjustable resistance device as claimed in claim 1, wherein each of the permanent magnets includes a rectangular magnet, and the two ends of the permanent magnet abut against the first ring and the second ring, respectively.

3. The adjustable resistive device as claimed in claim 2, wherein the polarity of each of the permanent magnets is opposite to that of the adjacent permanent magnets.

4. The adjustable resistance as claimed in claim 3, wherein each electromagnet has a magnetic post, a first magnetic pole, a second magnetic pole and a coil, the first magnetic pole and the second magnetic pole being disposed at both ends of the magnetic post, and the coil being wound on an outer ring surface of the magnetic post and located between the first magnetic pole and the second magnetic pole.

5. The adjustable resistance device as claimed in claim 4, wherein the first magnetic pole and the second magnetic pole of each electromagnet are respectively in contact with the adjacent permanent magnets.

6. The adjustable resistance as claimed in claim 4, wherein in a first mode, the magnetic field direction of each electromagnet is the same as the magnetic field propagation path of adjacent electromagnets.

7. The adjustable resistive as claimed in claim 4, wherein in a second mode, the magnetic field direction of each electromagnet is opposite to the magnetic field propagation path of adjacent electromagnets.

8. The adjustable resistance as claimed in claim 1, wherein the first ring and the second ring are made of a magnetically conductive material.

9. The adjustable resistance device as claimed in claim 1 further includes a first sealing cover and a second sealing cover, respectively disposed outside the first ring member and the second ring member to form a first flow space and a second flow space, and the rotating shaft protrudes from the first sealing cover and the second sealing cover.

10. The adjustable resistance device as claimed in claim 9, wherein the two resistance discs are located in the first flow space and the second flow space, respectively, and the two magnetorheological fluid layers are filled in the first flow space and the second flow space, respectively.

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