Different electromagnets operate in various ways, and push-pull electromagnets are different from holding electromagnets.

The telescopic electromagnetic magnet utilizes a coil to generate a strong magnetic force in a compact space. The assembled coil is encapsulated within a metallic iron tube, using high permeability steel to achieve a smaller size and weight while producing a greater attractive force. The design of the movable core employs an auxiliary magnetic circuit to increase the output power by 20% to 50%.

Retentive electromagnets utilize the advantages of permanent magnets. Their operating principle is similar to that of all linear electromagnets. When the coil is powered, the movable core moves, and even after the power is disconnected, the movable core remains in the powered position. This is because the permanent magnet creates a magnetic field to retain the movable core, allowing the power to be disconnected after the coil is powered, using the magnet to retain for energy-saving effects.瞬间 delivering a large amount of power produces a substantial force, and the magnet's long-duration retention prevents the coil from being damaged by excessive heat.

Retentive electromagnets are categorized into two types: single-retentive electromagnets and dual-retentive electromagnets.

Permanent Magnet Solenoid: Utilizing a permanent magnet located at one end of the frame, its operating principle is similar to that of all linear motion solenoids. Upon the coil being energized, the sliding rod moves towards the core and stops at the end position. When the power is disconnected, the sliding rod remains in place. To return the sliding rod, reverse voltage or current must be applied. These solenoids can be designed for both pull-in and push-out actions.

Bi-directional Holding Electromagnet: While a single-holding electromagnet keeps the core at only one position at the end of the stroke, the bi-directional holding electromagnet features a dual-coil structure with a permanent magnet situated between the two coils. This design allows the core to be held at two different positions—both at the start and the end of the stroke—and these positions provide equal output force.

Single-pole electromagnet: Offers advantages such as stable operation, high precision, long service life, energy-saving, and environmental protection.

Double-Sided Maintained Electromagnet: Features bidirectional self-retaining characteristics, advantages such as energy-saving and environmental protection. Utilizes a high-power instant pulse current for quick startup, generating a significant initial force, then powers off to self-retain with a strong holding force. Widely applied in DC charging gun electronic locks and AC power outlet electronic locks, etc.