Induction machines

Conductive-Induction Machines Electrostatic separators exploiting the principle of conductive induction will generally use the follovv -ing electrode designs ... 

The rotor flux-oriented control is more popular among different manufacturers to achieve high precision of speed control in an induction machine. With this technology (any of the three methods noted above), it is now possible to obtain a high performance of the machine, i.e. torque up to 100% of Tr at speeds down to zero. 

Characteristics are similar to an induction machine as shown in Figure 6.51 ... 

Bressani, M., Bobig, P. and Secco, M., A support experimental program for the qualification of safely-related medium-voltage induction motors for nuclear power generating stations. Presented at the International Conference on the Evolution and Modem Aspects of Induction Machines Torino, July (1986). 

By the harmonic flux and frequencies Increased iron losses in the inductive machines, operating on such a system, due to saturation effects (equations (1.12) and (1.13). 

Mingers, J., 1989. An Empirical Comparison of Pruning Methods for Decision Tree Induction. Machine Learning, 4, 221. 

Any given machine will have minimum and maximum allowable steam flows. In the case of extraction and induction machines, there will be minimum and maximum flows allowable in each turbine section. These minimum and maximum flows are determined by the physical characteristics of individual turbines and specified by the turbine manufacturer. 

A different type of apparatus was the induction machine of Count Ruhmkorff, introduced in 1851. The tests conducted in 1853 at la Villette, near Paris proved to be so successful that the machine was adopted in France for mining. It was successfully used in 1854 by Count de Mon cel for blasting in Port of Cherbourg. The machine was also patented in England, in 1855, 1862. 1864. The induction exploders are not used any more being replaced by other systems, such as magneto type, etc... 

The working principle of the induction machines is based on the fact that rotor currents are induced by the stator currents, and this is the main cause of losses in the rotor windings, which makes these types of machines less efficient than other brushless machines [11]. However, asynchronous machines are widely used and their mass production makes them reliable and well developed, for that reason their cost is quite low. 

At this stage operational impedances and time constants have been derived for synchronous machines, and for induction machines, if appropriate substitutions are made as shown in Reference 23. 

The absence of the field winding can be used to convert the mathematical model of the synchronous machine into one for an induction machine. In addition the mutual inductance in the < -axis is made equal to mumal inductance in the d-axis, i.e. the machine becomes symmetrical in both axes. The matrix equations (20.6) to (20.16) are modified as shown below. In these equations the mutual inductances Mj and become M, Lim and Lihq become L/j., Rjut and R/aj become Rk. All the derived reactances and time constants for an induction machine are equivalent to those appUcable to the g-axis of the synchronous machine. 

It is reasonable to regard the rotor windings as damper windings and use the notation of sub-transient reactances. Hence the following derived reactances and time constants are appropriate to induction machines. 

F. D. Rodriguez and O. Wasynczuk, A refined method of deriving reduced order models of induction machines. IEEE Transactions on Energy Conversion, Vol. EC-2, No. 1, March 1987. 

S. S. Kalsi and B. Adkins, Transient stability of power systems containing both synchronous and induction machines. Proc lEE, Paper No. 6517P, Vol. 118, No. 10, Oct 1971. 

Fuchs, K. W. (2003). Some diagnosis methods for voltage source inverters in variable speed drives with induction machines—A survey. In Proceedings of the 29th Annual Conference cf the IEEE Industrial Electronics Society, IECON 032 (pp. 1378-1385). 

Advantages of PWM-Fed Induction Machine Appiied to Mine Hoists... 

ADVANTAGES OF PWM-FED INDUCTION MACHINE APPLIED TO MINE HOISTS... 

Jansen, P.L., Lorenz, R.D., A Physically Insightful Approach to the Design and Accuracy Assessment of Flux Observers for Field Oriented Induction Machine Drives," IEEE Transactions on Industry Apphcations, 1994, 30(1) 101-110. 

In recent years, the electrical drive manufacturers who have traditionally supplied equipment for mine winders have ceased production of large, slow speed DC machines and, depending on the manufacturer, only slow speed synchronous or induction machines suitable for mine winders can be sourced in sizes exceeding ISOOkW. (See Figure 27.)... 

Keywords Bond graphs Rotary electric machines DC and AC Machines Synchronous machines Induction machines Permanent magnet machines Reluctance machines Electrical drives... 

Chapter 11], for instance. Some of these models are presented in Section 8.3. They are more complex than those in the previous sections and are intended or well suited to perform studies demanding more modeling details, like effects of magnetic phenomena and misbehavior due to faults. The induction machine and the switched reluctance motor are treated as example. 

Section 8.2.1 immediately following this short introduction presents more models of DC-machines while Section 8.2.2 deals with AC synchronous and induction machines, the latter being discussed in more detail. Both are the kind of machines most likely to be encountered in industrial systems converting power in the range... 

---