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Fig 60 with two coils at right clngles. The accompanying diagram (Fig 61) shows the waveforms of the generated e. The generator terminal voltage ncver falls to zero but it is obvious that two distinct disadvantages are still evident.

Secondly, but or prime importance is the new condition 131 ELECTROMAGNETIC INDUCTION B A EM. Since the brushes must be placed in a position to contact the coil in which e.

Thus coil A tends to be short-circuited by a coil in which the e. This current is diverted from the. If the number of coils is increased, the tendency would be to give a smoother output voltage but continued arcing at the brushes would persist. This arrangement Is obviously not satisfactory. In the early period of development of a satisfactory arrangement for the armature conductors many ideas were introduced. One such arrangement was incorporated in the Gramme-Ring Armature, which involved a special construction, in that the armature iron q c u i t was built up as a ring and the conductors were connected in series, with tappings being Plendil (Felodipine)- FDA out Plendil (Felodipine)- FDA the commutator segments.

This was a most uneconomical arrangement since it wasted conductor material. Although the Gramme-Ring Armature is shown (Fig Plendil (Felodipine)- FDA, it is abnormality that this never was a commercial proposition. The only reason why it is being described here is Plendil (Felodipine)- FDA it shows the student how a continuous closed winding can be made to operate as a suitable source of generated e.

It is not intended that the reader should give the arrangement undue attention nor should he consider the actual details worth remembering.

The ring arrangement shows how a continuous winding is possibk, in which the induced e. The coils in which no e. All other active conductors are however used to advantage and are connected in series to Diatrizoate Meglumine and Iodipamide Meglumine Injection (Sinografin)- FDA the e.

Even though the armature is rotating, the disposition of the active conductors in space can be considered to be stationary. As any one coil passes from one side of a brush to the Plendil (Felodipine)- FDA, it leaves the series circuit of one parallel branch of the armature winding to be replaced by a similar coil, which has just been cornmutated o r short-circuited by passing under a brush.

Thus one coil enters into the series circuit of one of the parallel paths as one coil leaves and the total e. For a 4-pole machine the winding will be divided into hf bf3 parallel paths and so on. The armature can now be looked upon as a battery made up from a number of similar cells.

An armature with one hundred Plendil (Felodipine)- FDA, being wound for a 4-pole machine, will mean twenty-five conductors are in series for one parallel path and there are four such parallel paths.

If 1V is generated in one conductor, the e. This is also the e. THE DRUM W I N DI N G. The diagram (Fig 63) h o w s the basic arrangement. This armatwg winding arrangement is accepted as the only modern method of connecting the active conductors together. The basic winding uses a number of coils in series Plendil (Felodipine)- FDA brushes, these coils being arranged at constant angles to each other.

T h e resultant e. The connecting up of such coils presents difficulties; but any requirement can be realised by. An Plendil (Felodipine)- FDA of a simple drum winding can now be considered. Fig 63 i 1 I I I i 1 A, B, C, D, etc are insulated conductors fitted into slots cut into the iron programs mental health the armature.

There are also four commutator segments Nos 123 and 4. The conductors may Plendil (Felodipine)- FDA connected Plendil (Felodipine)- FDA each otlier and to the pfizer logos in a variety of ways and one possible arrangement is shown in the diagram. With rotation as shown, the e. The full lines show coqnection to segments and Plendil (Felodipine)- FDA dotted lines connections, Plendil (Felodipine)- FDA constitute the overhang of the coils, at the back.

There are thus two circuits in parallel and it will also be noticed that, as a brush passes from one segment to the next, one coil is short-circuited and the brush must be located so Plendil (Felodipine)- FDA to short the coil at the instant when its e. Such an instant is shown in Fig 63b giving correct commutation conditions for the short-circuited coils between segments 1 and 2 and between segments 3 and 4. The average stseng4li of the field in the air-gap is 0.

If the armature has 144 conductors arranged in 8 parallel paths, find the e. A N D D. THEORY The reader will be required from now onwards to give equal attention to both the a. T o assist in this, the following chapters in Volume 6 will treat both aspects of theory alternatively, thereby ensuring correct progression along both channels of study.

It should be noted that the amount of a. Here in Volume 6, Plendil (Felodipine)- FDA the broad coverage of the d. Agents and capacitance have also been introduced because of their importance to a.

The following diagram will help to explain the course b a n g followed. Generator) CHAPTER 7 (Basic A. Theory) I CHAPTER 10 (The D. Motor) CHAPTER 9 (The A. Circuit) CHAPTER 12 (Electromagnetism) CHAPTER 1 1 (.

The axles are 1. Find the generated e.



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