- #1
Vacre
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Hello
I have composed some figures for a flywheel system that would be used in a custom car and involve multiple flywheels. The vehicle would be use the flywheels for energy storage and recovery, and would be powered by electric engines placed on the drive axles. These flywheels would be magnetically levitated, and operate in a vacuum, and have a group shielding (as opposed to an individual shielding for each). I would expect the flywheels to be magnetically levitated, and shielded as a group in a L:60 x W:30 x H:33 box of mild steel that is at least half an inch thick (although I am not sure if that is too much or too little).
I am considering multiple flywheels because a single flywheel would incur weight issues (with the flywheel itself and the system), gyroscopic issues, and shielding issues, I have decided to divide the power into multiple flywheels. There would be at least 18 flywheels.
Gyroscopic forces: dividing the total energy into 18 flywheels and then spinning 9 clockwise and spinning the other 9 counter- clockwise would help mitigate negative effects. Placing the flywheels in a containment system that is not rigidly mounted to the vehicle would also help.
Shielding: increasing the number of flywheels should help by decreasing the amount of material in the event of a failure. The division of energy among flywheels also involves decreasing the amount of energy that would be output by one, massive flywheel in the event of a failure.
But I am not familiar with specific carbon fiber materials and wanted to know what sort of energy storage I could achieve with a flywheel has a 27- inch diameter, a low moment of inertia, and up to a one- inch thickness. The thickness is not fixed because I am not sure what I can get out of a .3- inches thick flywheel versus a one- inch thick flywheel. I considered the 27- inch diameter because of some figures I made using a bicycle tire physics unit I found online.
I have looked at some sources and understand that the essential ceiling for flywheel rotation is 100, 000 rpm. The flywheels being used in Kinetic. Energy. Recovery. Systems. (Formula One, Porsche GT3 R Hybrid) typically have 40k rpm limits, but they also have low energy capacities of around .2 kilo-watt hours. I would like to get at least one kWh per flywheel, and this would require a higher rpm level of maybe 65k to 85k rpm. This high rpm is the reason I considered carbon fiber.
I would be grateful if someone could provide the dimensions of the flywheel that could achieve this (the diameter does not have to be 27 inches), material to be used, cost of the flywheel, and energy capacity equaling at least one kilo-watt hour.
Thank you
I have composed some figures for a flywheel system that would be used in a custom car and involve multiple flywheels. The vehicle would be use the flywheels for energy storage and recovery, and would be powered by electric engines placed on the drive axles. These flywheels would be magnetically levitated, and operate in a vacuum, and have a group shielding (as opposed to an individual shielding for each). I would expect the flywheels to be magnetically levitated, and shielded as a group in a L:60 x W:30 x H:33 box of mild steel that is at least half an inch thick (although I am not sure if that is too much or too little).
I am considering multiple flywheels because a single flywheel would incur weight issues (with the flywheel itself and the system), gyroscopic issues, and shielding issues, I have decided to divide the power into multiple flywheels. There would be at least 18 flywheels.
Gyroscopic forces: dividing the total energy into 18 flywheels and then spinning 9 clockwise and spinning the other 9 counter- clockwise would help mitigate negative effects. Placing the flywheels in a containment system that is not rigidly mounted to the vehicle would also help.
Shielding: increasing the number of flywheels should help by decreasing the amount of material in the event of a failure. The division of energy among flywheels also involves decreasing the amount of energy that would be output by one, massive flywheel in the event of a failure.
But I am not familiar with specific carbon fiber materials and wanted to know what sort of energy storage I could achieve with a flywheel has a 27- inch diameter, a low moment of inertia, and up to a one- inch thickness. The thickness is not fixed because I am not sure what I can get out of a .3- inches thick flywheel versus a one- inch thick flywheel. I considered the 27- inch diameter because of some figures I made using a bicycle tire physics unit I found online.
I have looked at some sources and understand that the essential ceiling for flywheel rotation is 100, 000 rpm. The flywheels being used in Kinetic. Energy. Recovery. Systems. (Formula One, Porsche GT3 R Hybrid) typically have 40k rpm limits, but they also have low energy capacities of around .2 kilo-watt hours. I would like to get at least one kWh per flywheel, and this would require a higher rpm level of maybe 65k to 85k rpm. This high rpm is the reason I considered carbon fiber.
I would be grateful if someone could provide the dimensions of the flywheel that could achieve this (the diameter does not have to be 27 inches), material to be used, cost of the flywheel, and energy capacity equaling at least one kilo-watt hour.
Thank you