Wie kan mij helpen met het berekenen van de minimale activatie tijd van een solenoid? Ik heb ook al een post geplaatst op fora maar denk plaats het ook even op facebook.... je weet maar nooit. let niet op mijn engels was snel ongecontroleerd getypt:P I have a problem. I want to calculate the minimum time i have to activate a (latching)solenoid so that its final velocity is 0 m/s when it hits the inside. Well I know the following things: F= m*a I know the force and the mass, so a can be calculated. V = a*t. the average speed after accelerating is V/2(assuming the acceleration is with a constant force/speed) i know the strength of the spring(max. 0.8N) with that i know the deceleration speed(f= m*a) again. if also the deceleration is with a constant speed then i know the ratio between acceleration and deceleration. the average speed of the acceleration is known, the deceleration is assumed linear and wished to end at 0 m/s and therefor has the same average speed as the acceleration period. i know the distance of the plunger to pull inside.(9 mm) S = 0.5at^2. where 0.5at can be taken as the speed. s = v*t Because we know the ratio between acceleration an deceleration we know how long the deceleration will take to hit 0 m/s again. This would make s=v*t*(1+Ratio). 1 = acceleration time, ratio is de deceleration time. s=v*t*(1+ratio) => S = 0.5at^2*(1+Ratio). rearrange so that time becomes the subject: t=√(s/(a/2*(1+R)) This gives me te answer of 2.9ms while in reality i have to power the solenoid for atleast 11ms, i did not include the pull force when the plunger closes in to the solenoid. (this would make the power time even less). neither did i include the inductance factor of the solenoid. And the friction(friction is almost none compared to the springs strength. pull force through the shaft is about
Posted on: Mon, 28 Jul 2014 21:05:06 +0000