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Slip rings are made in various types and sizes; one device made for theatrical stage lighting, for example, had 100 conductors. [6] The slip ring allows for unlimited rotations of the connected object, whereas a slack cable can only be twisted a few times before it will bind up and restrict rotation.
However, the slip power was lost in the resistors. Thus means to increase the efficiency in variable speed operation by recovering the slip power were developed. In Krämer (or Kraemer) drives the rotor was connected to an AC and DC machine set that fed a DC machine connected to the shaft of the slip ring machine. [7] Thus the slip power was ...
Slip ring motors: Starting, switching off 60947-6-2 AC-43 Squirrel cage motors: Starting, switching off during operation 60947-6-2 AC-44 Squirrel cage motors: Starting, counter-current braking ¹) or reversing ¹), typing ²) 60947-6-2 AC-45a Switching of gas discharge lamps 60947-6-2 AC-45b Switching incandescent lamps 60947-6-2 AC-51
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Compared to a squirrel-cage rotor, the rotor of the slip ring motor has more winding turns; the induced voltage is then higher, and the current lower, than for a squirrel-cage rotor. During the start-up a typical rotor has 3 poles connected to the slip ring. Each pole is wired in series with a variable power resistor.
A color scroller, color changer, or "scroller" is a lighting accessory used to change color gels on stage lighting instruments without the need of a person to be in the vicinity of the light. [5] It is attached in the gel frame holder on the outside of a lighting instrument, immediately in front of lens assembly.
Its includes an auxiliary winding composed of a copper ring called a shading ring (or shading coil with more than one turn). [ 5 ] The auxiliary winding produces a secondary magnetic flux which, along with the flux from the primary coil, forms a rotating magnetic field suitable for applying torque to and rotating the rotor. [ 6 ]
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
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