September 16th, 2008
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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:
Written by John on September 16th, 2008 with no comments.
Read more articles on Construction of D.C. Machines and Direct Current Machines and Electrical Machines.
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 [...]
Written by John on September 16th, 2008 with no comments.
Read more articles on Construction of D.C. Machines and Direct Current Machines and Electrical Machines.
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 – 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 [...]
Written by John on September 16th, 2008 with no comments.
Read more articles on Construction of D.C. Machines and Direct Current Machines and Electrical Machines.
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:
Written by John on September 16th, 2008 with no comments.
Read more articles on Construction of D.C. Machines and Direct Current Machines and Electrical Machines.
