Dynamical Equations of Electromechanical Systems: Dynamical Equations of Electromechanical Systems – Figure 4.19 shows an electromagnetic relay whose armature is loaded with spring K, damper B, mass M and a force generator F. Figure 4.20 shows the abstracted diagram of a general electromechanical systems. It is easily noticed that the electromechanical device has one electrical […]

Electric Field Energy: Electromechanical energy conversion via the electric field is analogous to the magnetic field case studied earlier. Charge in the Electric Field Energy is analogous to flux linkages and voltage to current in the magnetic field case. Figure 4.18 shows a parallel plate condenser with a fixed and a movable plate. The condenser is […]

Force System with Permanent Magnets: Method of finding force system with permanent magnets is best illustrated by an example. Figure 4.17(b) shows a moving armature relay excited by a permanent magnet (PM). The dc magnetizing curve of the permanent magnet is drawn in Fig. 4.17(a) which upon linear extrapolation at the lower B-end can be […]

Multiply Excited Magnetic Field System: Multiply Excited Magnetic Field System – Singly-excited devices discussed earlier, are generally employed for motion through a limited distance or rotation through a prescribed angle. Electro-mechanical transducers have the special requirement of producing an electrical signal proportional to forces or velocities or producing force proportional to electrical signal (current or […]

Principle of Electromechanical Energy Conversion: Principle of Electromechanical Energy Conversion is a reversible process and Eqs (4.26) to (4.29) govern the production of mechanical force. In Fig. 4.4 if the armature is allowed to move on positive x direction under the influence of Ff, electrical energy is converted to mechanical form via the coupling field. If […]

Field Energy and Mechanical Force: Field Energy and Mechanical Force – Consider once again the attracted armature relay excited by an electric source as in Fig. 4.4. The field produces a mechanical force Ff in the direction indicated which drives the mechanical system (which may be composed of passive and active mechanical elements). The mechanical […]

Energy in Magnetic System: Energy in Magnetic System – The chief advantage of electric energy over other forms of energy is the relative ease and high efficiency with which it can be transmitted over long distances. Its main use is in the form of a transmitting link for transporting other forms of energy, e.g. mechanical, […]