blazo said:
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Temperatures:
20.1C.2 (860c) (power limit 525W) with field weakening -- 75c
20.1C.2 (860c) (power limit 525W)without field weakening -- 74c
0.20.0beta1 (lcd3) (power limit 550W, so even a little higher) -- 55c
Than I tested 20.1C.2 (860c) and set up my max power to 400W. And I got 65c but the ride uphill was much slower.
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Well thanks for the test
Immediately a clarification, the comparison between v20.1C and 0.20beta1-LCD3, is not on equal terms, I have already written it.
The ADC conversion parameters of the current are different.
In all recent versions, one ADC step equals 0.156 Amp, in 0.20beta1-LCD3 it is 0.17 Amp.
The difference is 10%, that's not a little bit.
There is however another parameter with 20% difference and it is for the phase current of the motor used in the calculation of the FOC angle.
I will have to do some tests to understand how much it can affect the actual current / power.
Surely the current / power limit of the 0.20beta1-LCD3 version, at the same value, is lower than v20.1C.
Another consideration, it is not enough to set the power limit, the limit current is also important, it must be adapted to the motor / battery voltage, with the new version this limit is reached more quickly.
The test method must also be improved, in addition to the maximum power, the time taken or the average speed should also be considered. It is to understand where the extra current / power absorbed by the battery goes, because if it goes to the wheel it is not a defect, just take it into account by adjusting the assistance level.
Personally I am very satisfied with this new version of mspider65, in addition to being quieter the motor, in my opinion it consumes less than the previous one.
In these days I have done some tests on a route already done many times, in my way of using the bike at 50/60 rpm without forcing, with 10°C external the motor reaches a maximum of 40°C and I think the sensor works correctly.
One day I increased the assistance by two levels to try to keep the power close to the 500W limit, I only got there in steep uphill sections.
I consumed 50% more battery, on 22 km the average speed was 18 km/h instead of the usual 14 km/h (ascent and descent), the max temperature 50°C instead of 40°C, but contrary to what I expected I did much more effort.
Pedaling uphill over 80 rpm has crushed my legs, having the limit power as a goal to maintain is not for me.
No I'm not going back, the temperature is a problem only in conditions of high power, it is not the only aspect to evaluate.
I'll try to understand and improve if I can, but I'm not going back.