In an electrodynamic movement, what replaces the permanent magnet?

In the context of electrodynamic movement, fixed coils play a crucial role in the generation of magnetic fields that allow motion to occur. In systems that traditionally rely on permanent magnets, such as electric motors or generators, replacing the permanent magnets with fixed coils enables the generation of a variable magnetic field through electrical current.

When current flows through the fixed coils, they generate a magnetic field that interacts with the rotor (or any other magnetic part of the system), thereby creating the force necessary for movement. This method is fundamental in many modern electrical devices where magnets may not provide the needed flexibility or control, especially in varying electromagnetic applications.

Using fixed coils can also help in applications where the strength of the magnetic field needs to be adjusted or controlled more precisely. Unlike permanent magnets, which have a constant magnetic field, fixed coils can provide a variable field depending on the input current, offering a more versatile approach in electrodynamic systems. This principle underlies the operation of many types of electric motors and generators in use today.