What kind of timer is there
The types of modern timers include electromagnetic dot timers, electric spark timers, persistence timers, parking timers, reaction timers, magnification timers, windows timers, and so on. Electromagnetic dotting timers and electric spark dotting timers are the most common.
The electromagnetic dot timer is a timing instrument that uses AC power. Its working voltage is 4-6V, and the frequency of the power supply is 50Hz. It beats once every 0.02s. Working principle: When the coil of the electromagnetic timer is energized, the coil generates a magnetic field, the vibrating plate in the coil is magnetized, and the vibrating plate moves up or down under the action of the permanent magnet magnetic field. The direction of the alternating current changes every cycle twice.
Therefore, after the vibrating plate is magnetized, the magnetic poles will change, and the direction of the permanent magnet’s force on it will also change. When the vibrating plate is subjected to a downward force, it strikes once, and when the vibration plate is subjected to an upward force, it does not strike. Dot once in a cycle of alternating current, that is, the time interval between every two points is equal to the cycle of alternating current.