What is the function of an electromagnetic clutch? What is its purpose?

The electromagnetic clutch controls the engagement and separation of the clutch by the on-off power of the coil. Electromagnetic clutch can be divided into: dry single-chip electromagnetic clutch, dry multi-chip electromagnetic clutch, wet multi-chip electromagnetic clutch, magnetic powder clutch, slip electromagnetic clutch, etc. The working mode of electromagnetic clutch can be divided into: power-on combination and power-off combination. Dry single-chip electromagnetic clutch: When the coil is powered on, magnetic force is generated to attract the "armor" plate, and the clutch is in the engaged state; when the coil is powered off, the "armor" rebounds and the clutch is in the disengaged state.

Dry multi-piece and wet multi-piece electromagnetic clutch: The principle is the same as above, and several friction payments are added. The same volume torque is larger than that of the dry single-piece electromagnetic clutch. The wet multi-piece electromagnetic clutch must be cooled with oil or other coolant when working. 2. Magnetic powder clutch: Place magnet between the active and the driven member. When the power is not turned on, the magnetic powder is in a loose state. When the power is turned on, the magnetic powder is combined, and the active and the driven member rotate at the same time.

Advantages: The torque can be adjusted by adjusting the current, allowing for a large slip. Disadvantages: The temperature rises larger when the slip is large, and the price is relatively high. Slide electromagnetic clutch: When the clutch is working, there must be a certain speed difference between the master and slave parts before torque transmission can be achieved. The torque depends on the magnetic field strength and speed difference. The excitation current remains unchanged, and the speed drops sharply with the increase of torque; the torque remains unchanged, and the excitation current decreases, and the speed decreases more severely. Since there is no mechanical connection between the main and slave parts, no wear and consumption, no magnetic powder leakage, no impact, adjusting the excitation current can change the speed and use it as a continuously variable transmission, which is its advantage. The main disadvantage of this clutch is that the vortex in the rotor generates heat, which is proportional to the rotational speed difference. The efficiency is very low when running at low speed, and the speed ratio of the driven shaft is the main efficiency value, that is, η=n2/n1. A mechanical transmission system suitable for high-frequency operation can combine or separate the driven part with the active part when the active part is operated. When the actuator and the follower are in a separate state, the actuator rotates and the follower is stationary; the actuator and the follower are in an engaged state, and the follower rotates between the actuator and the follower.