Malcolm
10 kW
I was just reading the Zilla blog the other day. The 3-phase Zilla is in development, but he said not to expect anything soon.
Gas/vacuum as Insulator
Air at atmospheric pressure is the most common gaseous insulation. The breakdown of air is of considerable practical importance to the design engineers of power transmission lines and power apparatus. Breakdown occurs in gases due to the process of collisional ionization.
Electrons get multiplied in an exponential manner, and if the applied voltage is sufficiently large, breakdown occurs. In some gases, free electrons are removed by attachment to neutral gas molecules; the breakdown strength of such gases is substantially large. An example of such a gas, with larger dielectric strength, is sulphur hexafluoride (SF6).
High pressure gas, provides a flexible and reliable medium for high voltage insulation using gases at high pressures, field gradients up to 25 MV/m have been realized. Nitrogen (N2) was the gas first used at high pressures because of its inertness and chemical stability, but its dielectric strength is the same as that of air. Other important practical insulating gases are carbon dioxide (CO2), dichlorodifluor9methane (CC12F2) (popularly known as Freon), and sulphur hexafluoride (SF6). The breakdown voltage at higher pressures in gases shows an increasing dependence on the nature and smoothness of the electrode material. It is relevant to point out that, of the gases examined to-date, SF6 has probably the most attractive overall dielectric and arc quenching properties for gas insulated high voltage systems.
TylerDurden said:That is funny. As if nerds don't already spend too much time & money on gadgets, if they find out they could possibly get laid...
fechter said:OK, until the induction motor is developed, you could increase the resistance to arcing and flashover on the commutator by pressurizing the area around the commutator with sulfur hexafluoride gas.
SF6 is probably expensive and hard to come by, but CO2 may be substantially better than air, and is much easier to get ahold of.
We used to use SF6 to fill the waveguides on our linear accelerator to prevent arcing at high power levels.
If the gas leaked out, the waveguide would do a major meltdown.
Slightly rounding the edges of the commutator segments may reduce arcing also.
Gas/vacuum as Insulator
Air at atmospheric pressure is the most common gaseous insulation. The breakdown of air is of considerable practical importance to the design engineers of power transmission lines and power apparatus. Breakdown occurs in gases due to the process of collisional ionization.
Electrons get multiplied in an exponential manner, and if the applied voltage is sufficiently large, breakdown occurs. In some gases, free electrons are removed by attachment to neutral gas molecules; the breakdown strength of such gases is substantially large. An example of such a gas, with larger dielectric strength, is sulphur hexafluoride (SF6).
High pressure gas, provides a flexible and reliable medium for high voltage insulation using gases at high pressures, field gradients up to 25 MV/m have been realized. Nitrogen (N2) was the gas first used at high pressures because of its inertness and chemical stability, but its dielectric strength is the same as that of air. Other important practical insulating gases are carbon dioxide (CO2), dichlorodifluor9methane (CC12F2) (popularly known as Freon), and sulphur hexafluoride (SF6). The breakdown voltage at higher pressures in gases shows an increasing dependence on the nature and smoothness of the electrode material. It is relevant to point out that, of the gases examined to-date, SF6 has probably the most attractive overall dielectric and arc quenching properties for gas insulated high voltage systems.
KillaCycle said:Interesting thought, but the brushes require air to work properly. I've run brush motors in vacuum, helium, 1600 psi N2, and 1600 psi argon. The brushes fail quickly in all these different atmospheres, but work just fine in air.