What is meant by frame solenoid？

Frame solenoid is also called box solenoid because it has a square shape. This frame solenoid is a device that generates electromagnetism. When the transformer core is rotating outside and its output power is in line with the conductive winding resistance, the coil with current has the same magnetic properties as a magnet. We usually make it in a strip or hoof shape to make it easier to magnetize the transformer core. In addition, in order to make the electromagnet immediately power off demagnetization, we often use fast demagnetization of soft iron or silicon steel material to make. This electromagnet will be magnetic when plugged into the power supply. When the power is turned off, the magnetic field will disappear. The square electromagnet has many uses in our daily life because its production also makes a great increase in the output of the generator set.

Electromagnet AC Principle
Let's take a look at the principle of electromagnet composition: electromagnet is mainly composed of coil, core and armature. Cores and armatures are generally made of soft magnetic materials. They are generally divided into DC magnets and communication electromagnets. What is the principle of communication electromagnet?
When the communication electromagnet coil is inserted, the core and armature are magnetized into two magnets of opposite polarity. When the adsorption force exceeds the reaction force of the tension spring, the armature steering point moves toward the core. When the current in the coil falls below a certain value or the power supply is interrupted, the electromagnetic absorption force is lower than the reaction force of the tension spring, and the armature returns to its original release direction under the reaction force.
It is worth noting that the electromagnetic absorption force of the communication electromagnet is composed of the magnetic field of the magnetic separator and the magnetic field of the magnetic separator of the magnetic field of the two alternating electric field force plus the DC net weight effect, easier to release, so the output power is low, the transformer core volume is large, the coil energy consumption is high; power factor is low, the coil current is large, the heat is serious, not only wasted power, but also cause premature destruction of the coil aging. Very bad. Therefore, most of the time we will choose DC power rather than communication solenoid.