For energy conversion between electrical and mechanical forms, electromechanical devices are developed. In general, electromechanical energy conversion devices can be divided into three categories: (1) Transducers (for measurement and control) These devices transform the signals of different forms. Examples are microphones, pickups, and speakers. (2) Force producing devices (linear motion devices) These type of devices produce forces mostly for linear motion drives, such as relays, solenoids (linear actuators), and electromagnets. (3) Continuous energy conversion equipment These devices operate in rotating mode. . | 48550 Electrical Energy Technology Chapter 5. Principles of Electromechanical Energy Conversion Topics to cover 1 Introduction 4 Force and Torque Calculation from 2 EMF in Electromechanical Systems Energy and Coenergy 3 Force and Torque on a Conductor 5 Model of Electromechanical Systems Introduction For energy conversion between electrical and mechanical forms electromechanical devices are developed. In general electromechanical energy conversion devices can be divided into three categories 1 Transducers for measurement and control These devices transform the signals of different forms. Examples are microphones pickups and speakers. 2 Force producing devices linear motion devices These type of devices produce forces mostly for linear motion drives such as relays solenoids linear actuators and electromagnets. 3 Continuous energy conversion equipment These devices operate in rotating mode. A device would be known as a generator if it convert mechanical energy into electrical energy or as a motor if it does the other way around from electrical to mechanical . Since the permeability of ferromagnetic materials are much larger than the permittivity of dielectric materials it is more advantageous to use electromagnetic field as the medium for electromechanical energy conversion. As illustrated in the following diagram an electromechanical system consists of an electrical subsystem electric circuits such as windings a magnetic subsystem magnetic field in the magnetic cores and airgaps and a mechanical subsystem mechanically movable parts such as a plunger in a linear actuator and a rotor in a rotating electrical machine . Voltages and currents are used to describe the Principle of Electromechanical Energy Conversion state of the electrical subsystem and they are governed by the basic circuital laws Ohm s law KCL and KVL. The state of the mechanical subsystem can be described in terms of positions velocities and accelerations and is governed by the Newton s laws. The .
