Electromagnetic Motion Devices – Chapter 1-1

Here are some important points I learned in my readings of chapter 1 of Electromagnetic Motion Devices:

• In all electromechanical devices, mechanical motion must occur (surprise!!). This motion reflects into the system as a flux linkage (in electromagnetic systems) or charge change (in electrostatic systems).
• Amperes Law. (Ni) is the current enclosed in a close loop circuit and has the units of (amperes), however it is commonly referred to as Ampere-Turn (At) or Magnetomotive Force (mmf).
• Generally (from what I understand) the way to solve the work out problems in this section is to
  1. draw the equivalent electric circuit diagram of the magnetic system
  2. calculate different R values (reluctances of different paths on the system) and come up with equivalent reluctance of the whole system
  3. Put all the know and unknown information into the ? * (R1+R2) = Ni equation.

• Electromechanical Motion Devices By Paul C. Krause