Electromagnetic motor timing.
2007-08-17 13:56:39 · 4 answers · asked by matte 1 in Science & Mathematics ➔ Engineering
if your on/off switch could be slow you can use a simple mechanical relay.
if you need the switch to be fast, even fast enough to be able for controlling the amount of power to the load, so you have to use SCRs ---silicon controlled rectifier.
just make a web search SCR, DC power conversion, DC motor drive
2007-08-17 14:55:35 · answer #1 · answered by Anonymous · 0⤊ 0⤋
You haven't stated the voltage, but at 50A MOSFETS (probably a number in parallel;) are probably a good choice, SCRs are more difficult in DC circuits because once they turn on they stay on until the current is stopped, that can be done with the help of a capacitor, but is more complicated than just turning a MOSFET on and off.
Searching for PWM motor control will find a lot of inforation.
2007-08-18 02:13:35 · answer #2 · answered by tinkertailorcandlestickmaker 7 · 0⤊ 0⤋
You really need a solid state switch or a variable frequency drive. Your finger on a button is going to get very tired pulsing that current.
2007-08-17 21:17:11 · answer #3 · answered by Rich Z 7 · 0⤊ 0⤋
http://www.4qdtec.com/ 4QD is THE Giant of websites for high current motor controllers.
I have 2 4QD 36v PWM MOSFET 100 amp controllers. they know their stuff.
Controlling brushed motors with pulsed high power DC is their game.
good luck
2007-08-21 01:04:49 · answer #4 · answered by Rockies VM 6 · 0⤊ 0⤋