What are the factors to be considered for selecting solenoids?
To obtain the optimum performance, reliability and life of a solenoid, selection considerations should include the following factors:
- Force or Torque. Pull, push or rotary load, developed by plunger when the coil is activated by an external voltage.
- Stroke.
- Temperature.
- Duty cycle.
What does a push pull solenoid do?
Solenoids are basically electromagnets: they are made of a big coil of copper wire with an armature (a slug of metal) in the middle. When the coil is energized, the slug is pulled into the center of the coil. This makes the solenoid able to pull (from one end) or push (from the other).
How do I choose a solenoid valve?
To determine the optimal size for your solenoid valve, you need to know the flow rate, which allows you to determine the flow factor (kv). The flow factor is a theoretical value that indicates the volume of water at room temperature that flows through the solenoid valve with a pressure drop of 1 bar for one minute.
What are two functions of a solenoid?
Its primary function is as the actuating coil of a contactor (a relay designed for large electric currents) which connects the battery to the starter motor proper.
How to calculate the force of a solenoid block?
Plugging the preceding equation into the equation for electromagnetic force gives the force-stroke relationship of the solenoid for a current i0: The Solenoid block solves for α and β by taking the two specified force and stroke measurements and substituting them into the preceding equation.
How is the electromagnetic force related to the solenoid?
The electromagnetic force is related to the solenoid current and inductance by: where α and β are constants. Plugging the preceding equation into the equation for electromagnetic force gives the force-stroke relationship of the solenoid for a current i0:
How does current in a solenoid valve work?
With increasing stroke the inductive resistance decreases and causes an increase in current consumption. This means that at the instant of de-energization, the current reaches its maximum value. The opposite situation applies to a DC solenoid where the current consumption is a function only of the resistance of the windings.
Can a plunger be removed from a solenoid?
For example, by changing the plunger tip geometry, the force versus stroke relationship can be totally altered. Most solenoids listed in our catalog have “non-captive” plungers. This means that the plunger is free to travel within the solenoid until it is totally removed from the body of the solenoid.