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Bishop, Robert H. - The Mechatronics Handbook [CRC Press 2002] Part 4

Tham khảo tài liệu 'bishop, robert h. - the mechatronics handbook [crc press 2002] part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The current i defined as flowing from left to right establishes the polarity of the voltage across R. FIGURE 11.24 Basic principle of mesh analysis. FIGURE 11.25 Use of KVL in mesh analysis. FIGURE 11.26 One-port network. o- Vr AWr R Once the direction of current flow has been selected KVL requires that V1 v2 v3. v2 A mesh o The number of equations one obtains by this technique is equal to the number of meshes in the circuit. All branch currents and voltages may subsequently be obtained from the mesh currents as will presently be shown. Since meshes are easily identified in a circuit this method provides a very efficient and systematic procedure for the analysis of electrical circuits. The following section outlines the procedure used in applying the mesh current method to a linear circuit. Mesh Current Analysis Method 1. Define each mesh current consistently. We shall always define mesh currents clockwise for convenience. 2. Apply KVL around each mesh expressing each voltage in terms of one or more mesh currents. 3. Solve the resulting linear system of equations with mesh currents as the independent variables. In mesh analysis it is important to be consistent in choosing the direction of current flow. To avoid confusion in writing the circuit equations mesh currents will be defined exclusively clockwise when we are using this method. One-Port Networks and Equivalent Circuits This general circuit representation is shown in Fig. 11.26. This configuration is called a one-port network and is particularly useful for introducing the notion of equivalent circuits. Note that the network of Fig. 11.26 is completely described by its i-v characteristic. Thévenin and Norton Equivalent Circuits This section discusses one of the most important topics in the analysis of electrical circuits the concept of an equivalent circuit. It will be shown that it is always possible to view even a very complicated circuit in terms of much simpler equivalent source and load circuits and that