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	<title>circuitmaniac.com &#187; Armature Reaction and Commutation</title>
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		<title>Methods of Improving Commutation &#8211; Equalizing Connections</title>
		<link>http://www.circuitmaniac.com/2009/05/12/methods-of-improving-commutation-equalizing-connections/</link>
		<comments>http://www.circuitmaniac.com/2009/05/12/methods-of-improving-commutation-equalizing-connections/#comments</comments>
		<pubDate>Tue, 12 May 2009 14:54:20 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1742</guid>
		<description><![CDATA[We know that the armature circuit in lap winding of a multipolar machine has as many parallel paths as the number of poles. Because of wear in the bearings, and for other reasons, the air gaps in a generator become unequal and, therefore, the flux in some poles becomes greater than in others. This causes [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Methods of Improving Commutation-E.M.F. Commutation</title>
		<link>http://www.circuitmaniac.com/2009/05/12/methods-of-improving-commutation-emf-commutation/</link>
		<comments>http://www.circuitmaniac.com/2009/05/12/methods-of-improving-commutation-emf-commutation/#comments</comments>
		<pubDate>Tue, 12 May 2009 14:43:18 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1737</guid>
		<description><![CDATA[In this method, an arrangement is made to neutralize the reactance voltage by producing a reversing voltage in the coil undergoing commutation. The reversing voltage acts in opposition to the reactance voltage and neutralizes it to some extent. If the reversing voltage is equal to the reactance voltage, the effect of the latter is completely [...]]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Methods of Improving Commutation- Resistance commutation</title>
		<link>http://www.circuitmaniac.com/2009/05/12/methods-of-improving-commutation-resistance-commutation/</link>
		<comments>http://www.circuitmaniac.com/2009/05/12/methods-of-improving-commutation-resistance-commutation/#comments</comments>
		<pubDate>Tue, 12 May 2009 13:31:33 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1734</guid>
		<description><![CDATA[Improving commutation means to make current reversal in the short-circuited coil as sparkless as possible. The following are the two principal methods of improving commutation: (i) Resistance commutation (ii) E.M.F. commutation We shall discuss each method in turn. Resistance Commutation The reversal of current in a coil (i.e., commutation) takes place while the coil is [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Commutation</title>
		<link>http://www.circuitmaniac.com/2009/05/10/commutation/</link>
		<comments>http://www.circuitmaniac.com/2009/05/10/commutation/#comments</comments>
		<pubDate>Sun, 10 May 2009 16:36:07 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1726</guid>
		<description><![CDATA[Fig. (2.6) shows the schematic diagram of 2-pole lap-wound generator. There are two parallel paths between the brushes. Therefore, each coil of the winding carries one half (Ia/2 in this case) of the total current (Ia) entering or leaving the armature. Note that the currents in the coils connected to a brush are either all [...]]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Demagnetizing and Cross-Magnetizing Conductors</title>
		<link>http://www.circuitmaniac.com/2009/05/10/demagnetizing-and-cross-magnetizing-conductors/</link>
		<comments>http://www.circuitmaniac.com/2009/05/10/demagnetizing-and-cross-magnetizing-conductors/#comments</comments>
		<pubDate>Sun, 10 May 2009 15:01:13 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1717</guid>
		<description><![CDATA[With the brushes in the G.N.A. position, there is only cross-magnetizing effect of armature reaction. However, when the brushes are shifted from the G.N.A. position, the armature reaction will have both demagnetizing and crossmagnetizing effects. Consider a 2-pole generator with brushes shifted (lead) θm mechanical degrees from G.N.A. We shall identify the armature conductors that [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/05/10/demagnetizing-and-cross-magnetizing-conductors/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Explanation of Armature Reaction</title>
		<link>http://www.circuitmaniac.com/2009/05/09/explanation-of-armature-reaction/</link>
		<comments>http://www.circuitmaniac.com/2009/05/09/explanation-of-armature-reaction/#comments</comments>
		<pubDate>Sat, 09 May 2009 18:51:35 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1709</guid>
		<description><![CDATA[With no current in armature conductors, the M.N.A. coincides with G.N.A. However, when current flows in armature conductors, the combined action of main flux and armature flux shifts the M.N.A. from G.N.A. In case of a generator, the M.N.A. is shifted in the direction of rotation of the machine. In order to achieve sparkless commutation, [...]]]></description>
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		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>Armature Reaction</title>
		<link>http://www.circuitmaniac.com/2009/05/08/armature-reaction/</link>
		<comments>http://www.circuitmaniac.com/2009/05/08/armature-reaction/#comments</comments>
		<pubDate>Fri, 08 May 2009 18:23:52 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Armature Reaction and Commutation]]></category>
		<category><![CDATA[Direct Current Machines]]></category>
		<category><![CDATA[Electrical Machines]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1704</guid>
		<description><![CDATA[In a d.c. generator, the purpose of field winding is to produce magnetic field (called main flux) whereas the purpose of armature winding is to carry armature current. Although the armature winding is not provided for the purpose of producing a magnetic field, nevertheless the current in the armature winding will also produce magnetic flux [...]]]></description>
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		<slash:comments>10</slash:comments>
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