QuickField

A new approach to field modelling

Main >> Applications >> Sample problems

Biased relay force

polarized relay force

A biased relay operation.

Problem type:
Axisymmetric multiphysics problem of Magnetostatics coupled to Transient magnetic analysis.

Geometry:
Biased relay force Biased relay operates on the compensation of the magnetic pull of the permanent magnet by the opposing magnetic field of the current in the coil. Plunger Core Winding + Winding - 24 mm 7.7 3 mm 13.2 mm 4 mm Ø24 mm Ø8.4 mm

Given:
Permanent magnet coercive force Hc = 500 kA/m;
Winding material is copper;
Winding number of turns: 312;
Nominal voltage: 3.5 V.
The core and plunger are made of steel with a nonlinear dependence B(H):

Task:
Determine the pulling force vs. time dependency after switching the relay on.

Solution:
Biased relay operates on the compensation of the magnetic pull of the permanent magnet by the opposing magnetic field of the current in the coil.
Initially the current is zero. The plunger is pulled in by the permanent magnet attraction. The initial state is simulated in DC magnetics problem.
Then the voltage is switched on, and the current in the coil changes the magnetic field distribution and force acting on a plunger, The transient electromagnetic process which leads to stabilization of the field distribution and current in the circuit is simulated in the transient magnetic problem. DC magnetic problem coupled to this Transient Magnetic problem provides the initial distribution of the magnetic field caused by DC Magnet.

Results:
The voltage is switched on at 4.5ms. At the moment of 6.3ms the plunger pulling force value changes direction

Biased relay force

  • Video: Biased relay force
  • Watch on YouTube.
  • Download simulation files (files may be viewed using any QuickField Edition).
  • New version QuickField 6.4

    Product
    Order
    Evaluation request
    Editions
    Version history
    Packages
    Components
    Programming
    Consulting

    Applications
    Industrial
    Educational
    Scientific
    Sample problems
    Success stories
    Customers

    Support
    Webinars
    Virtual Classroom
    Online courses
    Customer login
    Glossary
    QuickField help
    FAQ

    Downloads
    QuickField Student Edition
    User manual
    Data Libraries
    Video
    Free tools

    News
    Product News
    Events
    Publications
    Subscription

    Contacts
    Tera Analysis info
    Resellers
    Contact us
    Online chat
    About us