|SinusLeistungsSteller - Sine-Current Control|
The SinusLeistungsSteller introduces the principle of field oriented control (FOC) to the model builder scene. The FOC has its origin in the industrial drive technology - e.g. steel mills, electric cars, hybrid cars, electric locomotives, etc. - i.e. from an area of very high demands on the drive train (Reliability, efficiency, control dynamics, noise emission, etc.)
In the areas of "big" drive systems the field oriented control has proven for years - however this method could not be established in the model construction sector so far. The towards block commutated ESCs significantly higher complexity of the FOC, which require the use of DSP (= Digital Signal Processor) with high processing power, was an obstacle all those years, for the use of such sophisticated converters in the model construction sector.
The SLS represents the attempt to make this exciting technology accessible, for both the ambitious modelers and users from industry .
The outstanding difference between ESCs that are common in the model builder scene and the SLS is the characteristic to be able to control the motor current, both in partial and at full load to a sinusoidal waveform. This results automatically from the above mentioned usage of the field-oriented control. This three-phase system, built-up by the FOC, ensures a smooth running of the motor, caused by widest possible avoidance of undesired torque-ripple and reduction of noise associated with it.
As a result of the reduction of current harmonics (Fourier), which mainly are responsible for the torque ripple, the motor can be operated with more power (in other words with the same power output the motor gets less warm ... or on the other hand: at the same temperature more power can be delivered).
The interaction of the 3 motor currents ensures a DC current drawn from the battery - and this is guranteed in all load situations. So pulse-shaped battery currents in partial load now belong to the past - the input capacitors (electrolytics) survive partial load phases longer. For the not very cheap LIPO cells an important point, since this way the lifetime of these batteries can be increased.
A measurement in comparison with a block commutated ESC can be found HERE (ca.300 kByte)