Explanation of the Solenoids Device Types
Depending on the type of motion cycle, a distinction is made between single, double and reverse acting solenoids.
Single acting solenoids are electromagnets in which the movement from the initial position to the end position is effected by electromagnetic force. An external force is required in order to return the solenoid to its initial position, e.g. spring force, weight force, etc.
Double acting solenoids (with position zero) are electromagnets in which the movement after excitation of the relevant coil takes place from position zero in one of the two opposite directions. Returning to position zero is achieved by external restoring forces after switch-off. Position zero is the initial position for both directions.
Reverse solenoids (without position zero) are electromagnets in which the movement takes place after excitation of the relevant coil from one end position to the other or vice versa.
Principle Rotary solenoid
Rotary Solenoid with return spring
Solenoids that perform a rotary motion are called rotary solenoids.
The single-acting version is the most common of them.
If a return movement is required, a return spring is adapted via suitable spring cage.
As a basic rule and analogically to linear solenoids, a reversible rotary solenoid version with 2 rotary solenoids working against each other can be put into practice. Solenoids Types
Retaining magnets are electromagnets that generally have no or only very small strokes.
Depending on the type of function, the counterpart is attracted by a magnetic field in energized or de-energized state.
Holding magnets create a magnetic field throughout a power supply connection.
Permanet holding magnets constantly attract magnetic counterparts. The magnetic field is generated by an integrated permanent magnet. If the devices are connected to the power supply, this magnetic field is largely neutralized by the magnetic field of the coil additionally installed. Solenoids Device Types