Recent Developments of Electrical Drives - Part 7. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | 45 I-4. Dynamic Modeling of VHM The correlation between experimental and simulated results is very good giving confidence in the model which can then be used to investigate the machine performance under various loading conditions. Fig. 9 shows the variation in the total three-phase power at the output obtained by subtracting the 12R loss from the product of no-load emf and generator current. There will be additional iron losses and eddy current losses in the permanent magnets which should be included to obtain total efficiency. Frequency control of a wave energy converter The results presented in Verfication of the Generator Models in Block B have been generated for a known displacement measured from the test rig and simply fed into the model by-passing the force model. This was done simply to verify the electrical parts of the model and hence served its purpose. However in any electromechanical system the interaction between the electrical and mechanical system are of interest. Fig. 10 shows the force data generated from the generator force model. Also included in the graph are results of force using an analytical model. The force model based upon the flux-linkage map has been verified using experimental results in 10 . The wave emulator test rig is a mass-spring damper system in which the amplitude is given by equation 6 and the resonant frequency is equal to the root of the ratio of stiffness to mass. On the test rig the mass is 190 kg the X F wave 7M2 - M 2 B 6 spring stiffness is 8 000 Nm and the friction B is equal to 148 N m which was estimated by parameter identification methods from experimental test results. Fig. 11 shows the frequency characteristics of the test rig for different values of B. 46 Mueller et al. a b Figure 8. a Calculated and measured terminal voltage. b Calculated and measured generator phase current. In a wave energy device active power is absorbed from the sea by its damping components. These are divided into mechanical viscous and .
