I was a little bit confuesed about the problems of rc esc´s with half trottle
after some serching of generally design from rc esc´s i found out that most of the esc´s are blockcomultating (hope it´s right)
i think thats the main problem so they designed for most time full throttle.
I found an esc thats designed for lower throttle but its a little pricy.
Otherwhise i think for the same money you will get an bicycle fork or an crank or.... so for high quality rc drive setup´s its maybe an option.
here´s an translation from the highlights
Conventional controllers are usually blockkommutierte on achieving and maintaining a designed maximum speed ('Vollgas' operation). This reached a peak drive its performance. (Power is proportional to RPM * Torque - the torque is limited by the maximum motor current -.. Possible more power is so only by increasing the speed) the same time a blockkommutierter controller operates at maximum speed in a relatively favorable operating point, as compared with the operating at partial load switching operations take place only a few of the power semiconductor switching losses are minimized and therefore in the power semiconductors. Only state losses are incurred and must be dissipated as heat.
If a regulator blockkommutierter operated at part load, will fall significantly more switching operations (PWM frequencies usual amount for the part-load operation 8kHz, 16kHz, 32kHz) and therefore switching losses. For such loss control services are usually blockkommutierte not designed to overheat if they are a long time operated at part load. This controller does not die blockkommutierte the 'heat death' is that only the complete shutdown of the drive as a way out. In practice, we encounter this problem with simple avoidance of the part-load ("never between 70% -90%") or a time limit of such a partial load condition 'by feel'.
Certain corrective gain additional heat sink and fan assembly, which are mostly cultivated by the user himself. This theory, an extension of the allowed part-time load is reached and the shutdown of the controller are delayed. Poor thermal connectivity of individual power semiconductors lead to failure of this method on a regular basis - a single overheated power semiconductors leads to the failure of the entire controller. In addition to the extra weight does not stay with this additional heat sink and / or fan unmentioned. Not should be mentioned: Some blockkommutierte regulator handle the situation elegantly by hochgeschalten is above a certain (even non-critical) part-load to 100%. Partial load does not exist for this control in the upper area!
When sinusoidal power controller makes use of field-oriented control mandatory also at full load with a relatively high frequency PWM switch - the motor current should eventually be controlled even at full load to a sinusoidal shape. The SLS has to be interpreted by its thermal design that is the 'worst case' full load. This also means that each state equal to full load operation (ie, every conceivable part-load operation) less power dissipation on the regulator with the result and thus is critical! The SLS is thus part load full!
As the largest loss of heat is obtained at full load, it is possible for the SLS of imminent overheating of the power output reduced (ie to go into partial load) and thus automatically to provide cooling. The SLS also switched not off when over-temperature, but continues to operate with reduced power, just enough that no temperature overshoot is observed. A non-vernachläßigender safety aspect!
OK, at full load incurred with more losses than SLS block-commutated controllers, which result out of the SLS higher switching losses. However, by the sine-flow losses avoided in the engine (keyword: harmonics), which compensate for the additional losses in more than SLS. So comparing a complete drive train "SLS + engine" with a "+ motor controllers blockkommutierter" the system with SLS in efficiency is better! ... and thus also in the expected flight time!
In addition, should in practice the very fact of not having to fly at full throttle most additional flight time based on a battery charge dysfunction!
did anyone know if there is a cheaper controller with sinusoidal power control?
greets and nice weekend