| Abstract |
Electro mechanic contacts are widely used in
several appliances, because they are cheap, but also very
robust, capable to withstand overvoltage and overcurrent
surges. Especially they are necessary with commutators of
universal electric motors for they are enabling commutation.
These motors achieve high power per a unit of volume
due to their high shaft speed, and they are produced at relatively
low costs for a unit of power. So, they are economically
very important for their numerous production, and
they use sliding contacts for their operation. The sliding
contacts are mechanical contacts and so electric arcs ignite
between their contact members during commutation, and
usually they are drawn arcs. Therefore it is very important
to determine contact materials which avoid forming the
electric arcs. |
