Brake the permanent magnet by Foucault’s currents when it moves near the metal surfaces
Abstract
Purpose: to investigate the braking of a permanent magnet Foucault’s current at its movement near the metal surfaces.
To achieve the goal set and solved the following scientific tasks:
- Theoretically, consideration is given to the process of falling of a magnet in a vertical conducting tube.
- Develop laboratory facilities and conduct research by studying the kinematic parameters of the magnet and their habits with large and formal induction of current.
- As an example of practical application of the acquired knowledge, develop a rescue lift.
The research object: Foucault’s currents.
The research subject: the process of braking the magnetic dipole, which moves near the conducting surface.
Research methods. Methodologically, work was based on the most general principles of physics, and its main scientific and practical results were obtained using modern digital oscilloscopic techniques.
Main scientific results.
- It is theoretically proved that at low speeds the braking force is proportional to the velocity of the magnet in a metal tube; at increasing speed the braking force decreases initially proportionally v–1, and then proportional v–1/2.
- The validity of the theoretical conclusions is confirmed by the results of experiments with glass, aluminum, brass and copper tubes.
- In the presence of a longitudinal section in the tube wall, the amount of braking force decreases by about 1,5 times compared with the continuous tube.
- Based on the research carried out, the design of a non-electric lift for the individual salvation of people from high-rise buildings has been developed.
Conclusions: 1) the process of inhibition of a permanent magnet by Foucault’s currents in the approximation of weak and strong skin effect was investigated theoretically and experimentally; 2) the design of a non-electric lift for the individual salvation of people from high-rise buildings has been developed.