I have been working on a project controlling a coil to attract a metal ball at high speed. I measure the speed of the ball in front of the coil and then decide how fast I want the ball to accelerate because the speed it needs to have when it leaves the coil is about 10 m/s. I found out I have about 9 miliseconds to use the coil. So what I was thinking is i'll use a MOSFET and a pwm signal in this way i can change the duty cycle and then control the coil. But I read on a site if I want this to work I need to switch high side and low side because else the coil still will be magnetic. now is my question: does somebody know what they mean or what I need and how does is work since I haven't got much experience with coils.
Specs: PWM signal : 3.3v 10Khz Coil: 51v 16A