Here is a quick ballpark way of getting drive system efficiency.
Take the square root of the percentage of regen to get the combined propulsion-regen efficiency.
If you were able to recover 69 percent of the energy being initially consumed by the propulsion motor then
the combined efficiency would be 83% after motor, controller, contactor, wiring and gear losses not including any additional losses caused by thrust on the bearing for each unit.
This test is not entirely accurate…. since we can't delineate between the propulsion and the regen unit. But it is still a nice, quick way of measuring a system for efficiency and does make an interesting benchmark.
So we assume propulsion motor efficiency 83% x regen motor efficiency 83% = 69%. This is the combined efficiency.
In actuality, either propulsion or regen will be operating at a higher efficiency than the other. We just don't have the tools to measure that….. yet
James Lambden
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
On Feb 22, 2016, at 5:26 PM, jt.yahoo@jtaylor.ca [electricboats] wrote:
true enough. I guess the only way to estimate propellor efficiency is to infer it by calculating all the other efficiencies, then looking at total watts in vs watts out and subtracting the known quantities, leaving what's left to be prop efficiency plus other unknowns. But we should be able to assume that the propellor efficiency is the lion's share of that.
Thanks for the correction./Jason
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Posted by: James Lambden <james@electroprop.com>
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