Abstract: A magnetic hysteresis brake includes an inner element and an outer element which defines a cavity for receiving the inner element such that the inner element and the outer element are rotatable about a pivot axis relative to each other. One of the elements is provided with magnets and the other is made of semi-remanent material such that the magnets generate in the semi-remanent material an induced magnetic field through the opposing surfaces. The brake includes a member for adjusting the axial position of one of the elements relative to the other of the elements in order to adjust a degree of engagement of the inner element into the outer element and therefore an intensity of the induced magnetic field. A control instrument and a vehicle include such a brake.

Abstract: The system for controlling the speed of movement of a sliding door for an aircraft comprises a means for electromagnetically braking the door including a transmission shaft and electromagnetic resistive means. The resistive means are autonomous and include a control law relating a first damping value to a first speed threshold of the speed of movement of the door, a second damping value to a second speed threshold of the speed of movement of the door, the resistive means applying on the transmission shaft the resistive torque equal to a first torque proportional to the first damping value when the speed of movement is higher than the first speed threshold, and applying the resistive torque equal to the sum of the first torque and of a second torque proportional to the second damping value when the speed of movement is higher than the second speed threshold.