Magnetic damping pendulum
- In stock with stable lead times — single units or complete sets
- Size, appearance and interaction can be adapted to the museum’s theme
- For science museums, campus science rooms, community science centers and mobile science museums
- Export packing and overseas on-site installation support
1. Content
Exhibition items mainly consist of exhibition stands, brackets, magnets, and single pendulum made of different materials. There are three sets of magnetic fields composed of permanent magnets set on the table, and in each set of magnetic fields, there are suspended single pendulums composed of different materials, namely aluminum pendulum, coil pendulum, and plastic pendulum, in pairs. When the audience participates in the interaction, they can use their hands to move each group's pendulum and release it from the same height to observe the movement status of each group's pendulum. The audience will notice that when the aluminum pendulum swings, it will quickly stop swinging; When swinging the plastic pendulum, it will swing freely for a long time; When the swinging coil swings, the coil swings slower and slower, which is the phenomenon of magnetic damping. The induced current generated by a pendulum made of different materials in a magnetic field is different, resulting in different magnetic field resistance, which leads to different motion states of the pendulum made of different materials.
2. Principle
The phenomenon of electromagnetic damping originates from the principle of electromagnetic induction. The macroscopic phenomenon is that when a closed conductor and a magnet undergo relative motion, electromagnetic resistance is generated between them, hindering the relative motion. This phenomenon can be explained by Lenz's law: when a closed conductor and a magnet undergo a motion of cutting magnetic induction lines, the magnetic flux penetrated by the closed conductor changes, and an induced current is generated. The magnetic field generated by this current will hinder the relative motion between the two. The magnitude of its resistance is proportional to physical quantities such as the magnetic induction intensity and relative velocity of the magnet.
The phenomenon of electromagnetic damping is widely used in situations that require stable friction and braking force, such as electric meters, electromagnetic braking machinery, and even maglev trains. In order to increase the stability of the system and suppress the resonance peak of the rotor in a simple and reliable manner, a new type of passive electromagnetic damper is proposed. Its structure is similar to electromagnetic bearings, but does not require closed-loop control and operates using direct current. Through analysis, it was found that the phase difference between the fluctuating current generated by the magnetic field changing during rotor vortex in the electromagnetic damper coil and the rotor displacement is the reason for damping. Formulas for calculating the fluctuating current and damping coefficient were derived. The experimental results show that the damping provided by the damper can effectively suppress resonance amplitude.
The traditional ABS brake system has been modified based on the principle of electromagnetic damping to adapt to the braking of electric vehicles. And optimized the traditional ABS in some details.
3. Purpose
The exhibition items mainly showcase the oscillation of different materials and structures of the same material in a magnetic field, and understand the phenomenon of magnetic field damping on metal materials by comparing and understanding them.