High power/weight ratio braking device based on shape memory material technology

The braking device (28) is provided with a group is resistance of the brake rod (42) each side of shape memory alloy device of counter-countermeasure structure (58). The brake and releasing state is controlled by the austenitic a shape memory alloy actuator. The brake starting programmeme, a shrinking of brake drive on the friction piece (52) (40) is contacted with the outer cylinder; with of the friction friction torque. Or the brake closed, the flexible glass fibre part (52) thereof is applied enough normal force to prevent the releasing brake between the roller and friction blade. A sharing, when the releasing device and heat, a friction sheet wherein the clamping part and roller capable of freely rotating.