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	<title>circuitmaniac.com &#187; Construction of D.C. Machines</title>
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	<link>http://www.circuitmaniac.com</link>
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	<lastBuildDate>Mon, 21 Nov 2011 18:35:03 +0000</lastBuildDate>
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		<title>Important terms regarding armature winding</title>
		<link>http://www.circuitmaniac.com/2009/04/29/important-terms-regarding-armature-winding/</link>
		<comments>http://www.circuitmaniac.com/2009/04/29/important-terms-regarding-armature-winding/#comments</comments>
		<pubDate>Wed, 29 Apr 2009 17:23:32 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>
		<category><![CDATA[armature winding]]></category>
		<category><![CDATA[back pitch]]></category>
		<category><![CDATA[coil and winding element]]></category>
		<category><![CDATA[coil pitch]]></category>
		<category><![CDATA[coil span]]></category>
		<category><![CDATA[commutator pitch]]></category>
		<category><![CDATA[conductor]]></category>
		<category><![CDATA[front pitch]]></category>
		<category><![CDATA[pitch of a winding]]></category>
		<category><![CDATA[pole pitch]]></category>
		<category><![CDATA[resultant pitch]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1650</guid>
		<description><![CDATA[Armature Windings The mean­ing of the following terms used in connection with armature winding should be clearly kept in mind. Pole-pitch It may be variously defined as : i) The periphery of the armature divided by the number of poles of the generator i.e. the distance between two adjacent poles. ii) It is equal to [...]]]></description>
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		<slash:comments>8</slash:comments>
		</item>
		<item>
		<title>Armature Shaft Bearings</title>
		<link>http://www.circuitmaniac.com/2008/09/16/armature-shaft-bearings/</link>
		<comments>http://www.circuitmaniac.com/2008/09/16/armature-shaft-bearings/#comments</comments>
		<pubDate>Tue, 16 Sep 2008 09:51:50 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=99</guid>
		<description><![CDATA[For small machines roller bearings are used at both ends. For large machines roller bearings are used at driving end and ball bearings at non driving or commutative end.Sometimes pedastal bearings are also used for large machines.The bearings are housed in the endshield.The figure below shows a pedestal bearing. Share and Enjoy:]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Brush Holders &amp; Brush Rockers</title>
		<link>http://www.circuitmaniac.com/2008/09/16/brush-holders/</link>
		<comments>http://www.circuitmaniac.com/2008/09/16/brush-holders/#comments</comments>
		<pubDate>Tue, 16 Sep 2008 09:24:33 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=92</guid>
		<description><![CDATA[Usually we use box type brush holders in all D.C. machines.At the outer end of arm a brush box is provided which is open at top and the bottom is attached.The brush is pressed to the commutator by means of a clock spring and this pressure could be adjusted by a level arrangement in the [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Brushes</title>
		<link>http://www.circuitmaniac.com/2008/09/16/brushes/</link>
		<comments>http://www.circuitmaniac.com/2008/09/16/brushes/#comments</comments>
		<pubDate>Tue, 16 Sep 2008 08:50:40 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=89</guid>
		<description><![CDATA[The brushes used for machines are divided into five classes according to the material with which it is made they are Metal Graphite brush Carbon Graphite brush Graphite brush Electro &#8211; Graphite brush Copper brush The maximum current density at brush contact varies from 0.5A/sq.cm to 23A/sq.cm for copper.For large current machines working at low [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Brush Gear</title>
		<link>http://www.circuitmaniac.com/2008/09/16/brush-gear/</link>
		<comments>http://www.circuitmaniac.com/2008/09/16/brush-gear/#comments</comments>
		<pubDate>Tue, 16 Sep 2008 07:20:23 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=81</guid>
		<description><![CDATA[We use brush gear to collect or feed current from a rotating commutator.A brush gear consists of following parts. Brushes Brush Holders Brush studs or Brush holder arm Brush Rocker Current collecting busbars Share and Enjoy:]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Commutator</title>
		<link>http://www.circuitmaniac.com/2008/09/15/commutator/</link>
		<comments>http://www.circuitmaniac.com/2008/09/15/commutator/#comments</comments>
		<pubDate>Tue, 16 Sep 2008 06:51:38 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=75</guid>
		<description><![CDATA[A commutator converts alternating voltage into direct voltage.A commutator is a cylindrical structure built up of segments made of hard drawn copper.These segments separated from each other and from frame by means of mica strips.These segments are connected to the winding by means of risers .The risers have air spaces between one another or that [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Armature Windings</title>
		<link>http://www.circuitmaniac.com/2008/09/15/armature-windings/</link>
		<comments>http://www.circuitmaniac.com/2008/09/15/armature-windings/#comments</comments>
		<pubDate>Tue, 16 Sep 2008 06:33:49 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=71</guid>
		<description><![CDATA[The armature windings are placed or housed in the slots grooved on the surface of armature and and are so spaced such that one coils side or say a conductor of coil comes under north pole and the other coilside or second conductor comes under south pole. Generally in D.C. machines two layer windings with [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Armature</title>
		<link>http://www.circuitmaniac.com/2008/09/15/armature/</link>
		<comments>http://www.circuitmaniac.com/2008/09/15/armature/#comments</comments>
		<pubDate>Mon, 15 Sep 2008 17:39:23 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=58</guid>
		<description><![CDATA[The armature consists of a core and winding.Due to the good magnetic properties of iron it is used as the armature core.Iron is also a good conductor of electricity so the rotation of iron core in the magnetic field could produce a current in the core and this current called eddy current cause the wastage [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Commutating poles /Interpoles</title>
		<link>http://www.circuitmaniac.com/2008/09/13/commutating-poles-interpoles/</link>
		<comments>http://www.circuitmaniac.com/2008/09/13/commutating-poles-interpoles/#comments</comments>
		<pubDate>Sat, 13 Sep 2008 09:48:54 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=55</guid>
		<description><![CDATA[Interpoles or commutating poles are similar to that of main poles and has got a core which terminates with in a poleshoe.it is constructed in various shapes and the coils are mounted on the core.It is usually spaced in between two two main poles and bolted to yoke.Interpoles are usually made of solid steel but [...]]]></description>
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		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Field Poles</title>
		<link>http://www.circuitmaniac.com/2008/09/13/field-poles/</link>
		<comments>http://www.circuitmaniac.com/2008/09/13/field-poles/#comments</comments>
		<pubDate>Sat, 13 Sep 2008 09:31:32 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Construction of D.C. Machines]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=51</guid>
		<description><![CDATA[In early stages or say in the case of small machines the poles were cast integral to the yoke.But nowadays we use completely laminated pole or solid steel poles with laminated pole shoes. Why we use laminated field poles? We use laminated field poles because the surface of armature is not uniform since it has [...]]]></description>
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		<slash:comments>1</slash:comments>
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