| 摘要 |
The cylindrical rotor of a switch for switching very large DC currents has a conducting element extending arcuately over a portion of its cylindrical surface and axially therealong. Two stationary brush members extend radially inward toward and axially along and are in sliding electrical contact with the cylindrical rotor surface. An arc chamber formed in the insulation between the brush members and extending arcuately around the rotor from one of the brush members accommodates the massive arc which is drawn as the rotor is rotated from a first position in which the conducting element shorts the brush members and conducts therebetween the very large current applied to the brush members and a second position in which contact between the rotor conducting element and the one brush member is broken. In one embodiment of the invention, the rotor conducting element shorts the second brush member to a third when the rotor is in the second position. In another embodiment of the invention, the first mentioned conducting element extends diametrically through the cylindrical rotor with additional conducting elements extending around the cylindrical surface on either side thereof. In this configuration, the additional conducting elements each short one of the brush members to an additional brush member when the rotor is in the second position and an arc chamber is also provided adjacent the second brush member.
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