barcode reader code in c# net Figure 1743 Induction motor classi cation in Software

Print QR Code in Software Figure 1743 Induction motor classi cation

Figure 1743 Induction motor classi cation
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Introduction to Electric Machines
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Figure 1744 Simpli ed induction motor dynamic model
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most commonly used type of induction motor, with typical values of slip of 3 to 5 percent Class C motors have a high starting torque for a given starting current, and a low slip These motors are typically used in applications demanding high starting torque but having relatively normal running loads, once running speed has been reached Class D motors are characterized by high starting torque, high slip, low starting current, and low full-load speed A typical value of slip is around 13 percent Factors that should be considered in the selection of an AC motor for a given application are the speed range, both minimum and maximum, and the speed variation For example, it is important to determine whether constant speed is required; what variation might be allowed, either in speed or in torque; or whether variable-speed operation is required, in which case a variable-speed drive will be needed The torque requirements are obviously important as well The starting and running torque should be considered; they depend on the type of load Starting torque can vary from a small percentage of full-load to several times full-load torque Furthermore, the excess torque available at start-up determines the acceleration characteristics of the motor Similarly, deceleration characteristics should be considered, to determine whether external braking might be required Another factor to be considered is the duty cycle of the motor The duty cycle, which depends on the nature of the application, is an important consideration when the motor is used in repetitive, noncontinuous operation, such as is encountered in some types of machine tools If the motor operates at zero or reduced load for periods of time, the duty cycle that is, the percentage of the time the motor is loaded is an important selection criterion Last, but by no means least, are the heating properties of a motor Motor temperature is determined by internal losses and by ventilation; motors operating at a reduced speed may not generate suf cient cooling, and forced ventilation may be required Thus far, we have not considered the dynamic characteristics of induction motors Among the integral-horsepower induction motors (ie, motors with horsepower rating greater than one), the most common dynamic problems are associated with starting and stopping and with the ability of the motor to continue operation during supply system transient disturbances Dynamic analysis methods for induction motors depend to a considerable extent on the nature and complexity of the problem and the associated precision requirements When the electrical transients in the motor are to be included as well as the motional transients, and especially when the motor is an important element in a large network, the simple transient equivalent circuit of Figure 1744 provides a good starting approximation In the circuit model of Figure 1744, XS is called the transient reactance The voltage ES is called the voltage behind the transient reactance and is assumed to be equal to the initial value of the induced voltage, at the start of the transient RS is the stator resistance The dynamic analysis problem consists of selecting a suf ciently simple but reasonably realistic representation that will not unduly complicate the dynamic analysis, particularly through the introduction of nonlinearities It should be remarked that the basic equations of the induction machine, as derived from rst principles, are quite nonlinear Thus, an accurate dynamic analysis of the induction motor, without any linearizing approximations, requires the use of computer simulation
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Part III
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AC Motor Speed and Torque Control As explained in an earlier section, AC machines are constrained to xed-speed or near xed-speed operation when supplied by a constant-frequency source Several simple methods exist to provide limited speed control in an AC induction machines; more complex methods, involving the use of advanced power electronics circuits can be used if the intended application requires wide-bandwidth control of motor speed or torque In this subsection we provide a general overview of available solutions
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