Linear Solenoids  Classification & Mechanism  Applications   Selection Factors    Option Board

Selection Factors for Linear Motion Solenoid

Bear these factors in mind while selectiong linear motion solenoids, or fill out Application Condition & Requirement Form (Optiona Board)

A. Output Requirements

  1. Stroke / Force
    --Definition of Stroke: Displacement of plunger in reference to position of fully pulled in. (ref. bellow pictures)
    --Solenoid generates force, which is changeable with stroke changes: bigger force at shorter stroke.
    (Ideal Result: Solenoid’s stroke / force curve matching that demanded by application)
      Pull Type Push Type
    0 Stroke

    S Stroke

  2. Response Time
    Time from energizing solenoid to plunger achieving desired displacement.
  3. Duty Cycle =On time /（On time＋Off time）〕X100%
  4. Maximum on time
    --Solenoid heats up while being energized. Duty cycle or maximum on time, and power of solenoid decide temperature rise of solenoid. --Temperature rise and ambient temperature decides selection of Insulation class.
    (Insulation Class=℃: A=105,  E=120,  B=130,  F=155,  H=180,  N=200,  C=220+)

B. Input Conditions

  1. Power Supply Mode & Power
    Input of different current wave shapes determines different motion mode of solenoid. Application may have: AC/DC (constant voltage / Current Supply, battery, dry cell, DC generator, capacitor), commutate and filer methods, voltage range and maximum current.
  2. Diode as Rectifier:
    If the power supply available for the solenoid is AC, a rectifier is required to convert it into DC. The rectifier should in principles be designed to be of full-wave rectificatino type. The rectifier elements should have a peak inverse voltage three times as high as the solenoid drive voltage.
  3. Current (Power) is in proportion to force output within limited range. Force won’t increase any more with current (power) increase when solenoid gained magnetic saturation.
    In the mean time: Temperature Rise increase in proportion to current (power)

C. Environment Factor & Life.

  • Environment factors & expected life are critical for material and finish consideration.
  • Environment factors include: temperature; humidity; magnetic or electric field; gas, liquid, dust pollutants or corrosives; impact or vibration, etc.

D: Connections of Assembling, Power Supply and Load; and Size:

  1. Assembly methods: a). external bolt.   b). solenoid frame thread holes   c). Fitting in
  2. Power supply connection method:  a). Lead wire    b). Lead wire + connector   c). 187 quick connect terminals
  3. Load connection method: .
           
         

E: Protection of Contacts in Driving Circuit.

The control contacts for use with the DC Solenoid may spartk, wear and cause noise interference. Provide a proper protection  as the case maybe.
Resistor & Capacitor Method Diode Insertion Method