Determination of the Synchronous Reactance | Open Circuit and Short Circuit test of Synchronous Machine: Determination of the Synchronous Reactance – With the assumption of a linear magnetic circuit, the circuit model (per phase) of a synchronous machine is as given in Fig. 8.10c. If Ra is neglected, it then follows that It is immediately […]
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Equivalent Circuit of Synchronous Motor: By assuming linearity of the magnetic circuit, it is possible to obtain simple Equivalent Circuit of Synchronous Motor. The validity of this assumption stems from the fact that air-gap is the predominant component of the magnetic circuit of the machine. As per Eq. (8.7), the resultant mmf phasor is given
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Voltage Regulation of Synchronous Generator: The Voltage Regulation of Synchronous Generator is defined on lines similar to that of a transformer. Consider the generator supplying full-load current at a specified power factor and rated terminal voltage, Vt (rated). As the load is thrown off keeping the field current constant, the terminal voltage rises to The
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Generating Mode and Motoring Mode of Synchronous Machine: Generating Mode and Motoring Mode of Synchronous Machine is derived by a realistic synchronous machine will have resistance ra and leakage reactance xl per armature phase which can be assumed to be lumped in series between the terminal voltage Vt and the air-gap emf Er for each
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Construction of Cylindrical Rotor Synchronous Machine: As stated earlier the Cylindrical Rotor Synchronous Machine offers constant permeance to mmf waves irrespective of the mechanical position of the rotor and is, therefore, simpler to model. Figure 8.1 shows the cross-sectional view of a 2-pole Cylindrical Rotor Synchronous Machine. The rotor has distributed windings which produce an
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What is Synchronous Motor | Construction | Advantages: A synchronous Motor is one of the important types of electric machines; in fact all generating machines at power stations are of synchronous kind and are known as synchronous generators or alternators. The structure and certain operational features of Synchronous Machine have already been explained in this
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DC Machine Applications Whenever the application of any machine is considered, its operating characteristics along with its economic and technical viability as compared to its competitors are the essential criteria. For a DC Machine Applications, of course, the main attraction lies in its flexibility, versatility and ease of control. This explains why in spite of
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Separately Excited DC Motor for Dynamic Analysis: Separately Excited DC Motor for Dynamic Analysis – The DC machines are quite versatile and are capable of giving a variety of V-A and speed-torque characteristics by suitable combinations of various field windings. With solid-state controls their speeds and outputs can be controlled easily over a wide range
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Hopkinsons Test on DC Machine: This is a regenerative test in which two identical dc shunt machines are coupled mechanically and tested simultaneously. One of the machines is made to act as a motor driving the other as a generator which supplies electric power to motor. The set therefore draws only loss-power from the mains
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Testing of DC Machine or Swinburne Test: Testing of DC Machine or Swinburne Test – Machine efficiency, in general, has been discussed already. The approach here will be to apply the general principles for the specific case of dc machines. The power flow diagrams for the generating and motoring modes of a dc machine are
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