SinusLeistungsSteller - SLS Development/2014 |
In this section we provide frequently news on development and progress ... Details about the SLS are found here (click...) 04.08.2014: In some cases, controllers failed, when they were connected to the battery without precharging the capacitors. We examined the occuring problem in detail (view P03.PDF ) and conclude, that the use of the existing precharge options is mandatory! 14.07.2014: The CLAFIS Privat Energy Solarboat Team also won the first Solar1 Monte-Carlo-Cup in Monaco. In total rating they occupied the 1. and also the 2. place, because they started with two boats. The scoring speaks for itself: 1000, 925, 569, 450, 433, ... 07.07.2014: Last week the DONG-energy Solar Challenge 2014 took place. This year 2 teams were equipped with the SinusLeistungSteller: The CLAFIS Privat Energy Solarboat Team around Gerard van der Schaar in the Top-Class (No.T63), equipped with a SLSi-60-240 and a EBSi-60-240 and also the Solarteam ROC Friese Poort Sneek around Ray Blokker in the A-Class (No.A08) equipped with a SLS-60-200-1PM We congratulate the CLAFIS Privat Energy Solarboat Team for their outstanding victory! ... unbelievable: in the the end-rating the advantage was over 3 and a half hours with respect towards the second place ... and this with a total driving time of only 7 hours!!! 11.06.2014: We were also able to increase the current significantly with the compact version: +40% ... a cSLSi-60-140-WK reached at max. current of 140Aac the temperaturure limit of 90°C after 10 minutes - at the capacitors! Even in derated operation (starting at minute 12) the max. current can almost be hold, without the caps temperature increasing over 90°C. ... we supported a bit with a small fan, because it was hot today in the office, almost 30°C! We transfered the caps-temperature-measurement and -derating also to the cSLSi, so the controller operated always within the temperature limits. We observed that the water cooling flow rate can be strongly reduced, without significantly increasing the power-modules temperature - when increasing the flow rate from 2.0L/min to 5.0L/min the temperature reduced only by 5 Kelvin - This can be seen in the two steps of the temperature plott (T_P). A constant current of about 120Aac should be possible without any problems - even with only 8mm² silicon cable on the motor side. SN58_140Aac_vergossen.slt 15.05.2014: The industrial-versions tend to become our bestsellers :-) ... 24.04.2014: Today we measured the first finished and potted SLSi-60-360. As all SLSi it additionly measures and monitors the capacitors temperature (in the resin, under the caps). The capacitor temperature will (similar as on the power-module (T_P)), be used for derating the power. The limit for derating is fixed at 90°C. The caps endure a temperature up to 105°C - that is also the temperature needed for a complete shutdown. This allows the capacitors to work always in a permitted temperature area! This can be seen in the first section of the diagram running up to 350Aac is clearly visible: the current is derated down to 280Aac automatically. The caps temperature (T_E) does not further increase and stabilizes at about 90°C. The electrolytic capacitors are outside in the air and usually a bit cooler than measured internally (see IR-picture). If needed an external fan can be attached in order to delay the derating at high currents. The water cooled power-MOSFETs are designed for constant operation. With the flow-rate of 5.0L/min (T_water=20°C) used in this test, a max. T_P of 73°C was reached. In addition to T_E and T_P we also had to monitor the motor temperature. Although our motor and generator where cooled by additional fan, we canceled the test as soon as the motor reached 100°C. Between the breaks of the high current tests, the motor cooled down to 50°c. After 10 minutes at 200Aac (incl. a short increase up to 250Aac) the motor temperature stabilized at a safe value of 98°C. A continuous operation at this working point is possible ... ... everything was measured at controlled partial load!
1004_350Aac_vergossen.slt
21.01.2014: The new year beginns with an extensive update of the SLS-WMonitor and the cSLS/SLS-firmware. Both can be found here download-area. Noticible innovations:
- settable current profile motoric and generatoric (option "current profile") - setpoint via serial port possible (by servo signal simulation or "control panel") - support of new hardware - e.g. SLSi-60-240 und SLSi-60-360 The current profile opens up completely new ways of use! E.g. limit of constant power (E.g. 250W at an e-bike ...not depending on RPM!),or monitoring the preset load-characteristic (e.g. unwanted objects in a propeller). In the industrial area new ways of testing, for example a load simulation within a motor-/generator-system are possible. On the motoric side the torque profile of an 2-stroke or 4-stroke engine could be simulated or a propeller-load could be simulated on the generatoric side. The possibility to set the working point via serial interface enables complete control of the motor. All reference values for RPM, motor-/generator-current can be set dynamically during runtime. A crossover from RPM- to torque-control proceeds fluently. The SLS_WMonitor supports these new possibilities trough a control panel (optional): All setpoint values can be comfortably managed over slide control via mouse. The actual values are shown graphically. The user is also able to set up his own control - the SW-protocol is provided on request. To recognize a industrial version correctly, the SLS-WMonitor has been extended. SLS/SLSi or cSLS/cSLSi are brought together through a shared firmware. In other words the SLSi and SLS operate with the same firmware (SLSxxxx.BIC) and cSLS/cSLSi also (cSLSxxxx.BIC). A cSLSi is treated identically as the cSLS (and appears also as cSLS in the SLS-WMonitor) - the SLSi can be recognized securely in terms of hardware differences. (and is shown in the SLS-WMonitor as SLSi). ... Development 2013 ... (click here...) |