This video explores the surprising capabilities of a powerful permanent electromagnet, focusing on its ability to precisely control magnetic force, fully demagnetize at specific electrical inputs, and launch objects. The creator tests the magnet's lower limit for dropping objects, demonstrating its capacity to release weights as light as 412 milligrams. Through detailed measurements, it's confirmed that the magnet can achieve full demagnetization across its surface at the same electrical input, exhibiting a linear relationship between current and magnetism. Furthermore, the video showcases the magnet's application as a launcher, successfully propelling compressed springs and even a tennis ball, with adjustable launch speeds, highlighting its versatility beyond simple holding force.
Exploring the Permanent Electromagnet: Precision Control, Demagnetization, and Launch Capabilities
0:00 Initial Questions: The video introduces key questions about a permanent electromagnet capable of 190kg force: its ability to drop very light objects, achieve full demagnetization at the same electrical input, and launch springs or payloads.
1:04 Testing Minimum Drop Weight: The magnet is tested to determine the minimum weight it can release, successfully dropping a 412mg pink paper clip, highlighting a surprisingly fine level of control.
1:49 Duty Cycle Reminder: The magnet has a maximum 30-second "on" duty cycle, important for operation.
2:18 Magnetization of Objects: Even small, uncoated paper clips can become magnetized when in the electromagnet's strong field, complicating tests of minimal release.
3:27 Full Demagnetization Confirmed: A key finding is that the permanent electromagnet can be fully demagnetized at the exact same electrical input (setting) that causes a light object to drop.
3:41 Linear Demagnetization: Measurements of the pole's magnetism at 250mA intervals demonstrate a linear relationship between applied current and demagnetization.
5:57 Initial Spring Launch Attempts: Smaller electromagnets are found to be insufficient for holding and launching springs.
6:27 Successful Spring Launches: Using the main, larger permanent electromagnet, the creator successfully launches both small and large compressed springs, demonstrating its capability as a launcher.
7:34 Variable Launch Speed: The launch speed of the springs can be adjusted by varying the power supply setting, allowing for softer decompression.
8:18 Payload Limitations: While capable of launching springs, the system is noted as "not a new satellite launcher" when testing a 57g tennis ball, indicating practical payload limitations.
9:04 Theoretical vs. Real-world Launch Heights: Calculations suggest potential launch heights of 3 meters (small spring) and 7.5 meters (large spring), which are found to be "not far from reality" in actual tests.
10:30 Community Engagement: The creator encourages viewers to suggest other tests for the magnet in the comments.