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The rated duty cycle is the: on_time/(on_time + off_time). How often will you need to kick the ball?I'll guess maybe every 10 seconds at the maximum, does this sound reasonable?From my post above the solenoid only needs to be energized for a 1/100 of a sec so that would be a 0.1% DC if it kicks every 10 seconds.I also calculated that 120N of force will be required to kick the ball with a 4m/s velocity. The conversion is 1N = 0.2278lb force, so the solenoid needs to have 431 oz force. The none of solenoids look to have the required force according to the data. The third solenoid is the strongest and may be a starting point for tests. This one is rated for 100 Watts and the additional data shows a coil resistance of 6.1 Ohm if wound for 24V. That will be 4 Amps of current.But I calculated that 480 Watts of power is required to accelerate the ball in a stoke length of 2cm. So my guess is that this solenoid will not get you the desired ball velocity. I understand that you already have a solenoid ball kicker so run some tests and measurements with that system to check on my calculations. Then you will have a much better idea as to what is required for the new ball kicker. What specs do you need for the DC-DC converter? Input voltage of 18V (LiPo). Output voltage? Output current? Duty cycle of power demand?Is this a school/team project? It does sound like it and it sounds like it is a fun, challenging project that is doable.
Is this a school/team project? It does sound like it and it sounds like it is a fun, challenging project that is doable.
And i didn't find any (small)solenoid that is 480Wor did you mean:100W solenoid that is boosted to a high voltage it would give 480 w?
i don't know what my output current should be as i guess as the voltage grows the current becomes less?
sorry i ask so many question's
i don't know what kind of chip/circiut i need to achieve those specs
Is this for RoboCup?I am actually part of a RoboCup team, too, but we play in the small sized league.We use a flyback converter to charge a 1F cap bank to ~220V, and was able to get it to kick near the maximum legal speed (forgot what it is). We use an FPGA for control, but a microcontroller will probably work also (if you have a big enough inductor, so the switching frequency doesn't need to be crazy high).http://en.wikipedia.org/wiki/Flyback_converterWe use a 4 cells lithium. Takes about 5 seconds to charge the capacitors.
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