Dynamic Modelling of Induction Motor: In general, the mechanical time-constant for any machine is much larger than the electrical time constant. Therefore, the Dynamic Modelling of Induction Motor can be simplified by neglecting the electrical transient without any loss of accuracy of results. The circuit model of Induction motor holds for constant slip but would […]
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Speed Control of Induction Motor: Stepless control of speed of induction motors cannot be carried out as efficiently and inexpensively as for dc motors. Various methods of Speed Control of Induction Motor can be visualized by consideration of the speed equation It is seen from this equation that there are two basic methods of speed
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Starting Methods of Induction Motor: Starting Methods of Induction Motor – At the time of starting the motor slip being unity, the load resistance with reference to the approximate circuit model of Fig. 9.23 is meaning thereby that short-circuit conditions prevail. Therefore, the motor current at starting can be as large as five to six
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Torque Slip Characteristics of Induction Motor: The expression for Torque Slip Characteristics of Induction Motor (T(s)) is easily obtained by finding the Thevenin equivalent of the circuit to the left of ab in Fig. 9.12. The circuit then reduces to Fig. 9.13 in which it is convenient to take VTH as the reference voltage. From
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Air Gap Power in Induction Motor | Torque and Power Output Equation: Air Gap Power in Induction Motor – The circuit model is shown in Fig. 9.10. The power crossing the terminals ab in this circuit is the electrical power input per phase minus the stator loss (stator copper-loss and iron-loss) and hence is the
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Induction Motor Equivalent Circuit: Induction Motor Equivalent Circuit – The behavior of the induction machine was studied in terms of the basic field phenomenon. The attempt here was purposely focused on the transformer analogy of induction motor. Certain facts established so far are summarized below: 1. where E2 = standstill rotor emf. Further I’2 flows
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What is RAM?: What is RAM? -Unlike ROM, we can read from or write into the RAM, so it is often called read/write memory. The numerical and character data that are to be processed by the computer change frequently. These data must be stored in type of memory from which they can be read by
What is Flash Memory in Digital Electronics? Flash Memory in Digital Electronics (sometimes called “flash RAM”) is a type of constantly-powered nonvolatile memory that can be erased and reprogrammed in units of memory called Blocks. It is a variation of electrically erasable programmable read-only memory (EEPROM) which, unlike flash memory, is erased and rewritten at
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NVRAM (Non Volatile Random Access Memory): NVRAM (Non Volatile Random Access Memory)- It is Non Volatile Ram. It created by the combination of a static RAM and an electrically erasable PROM (EEPROM) in the same chip. The EEPROM and static RAM have exact mirror memories structure of each other. Upon powered it functions as a
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IC 723 Voltage Regulator: The popular general purpose precision regulator is IC 723. It is a monolithic linear integrated circuit in different physical packages. The pin diagram of IC 723 Voltage Regulator along with the various packages is shown in the Fig. 2.109 (a), (b) and (c). Features of IC 723: It works as voltage
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