| ??? 04/04/07 10:44 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#136583 - you need a H-bridge as has been mentioned Responding to: ???'s previous message |
A MOSFET driver and to control the motor speed you use Pulse Width Modulation.The idea with DC motors with brushes at any rate is that you are effectivly driving a large inductor with a square wave of varying timescale.The affect of that is that when the voltage is high the current through the inductor will start to rise, and when its off will start to fall. You need to arrange the frequency of the Pulse Width Modulation such that the current through the inductor doesnt have time to change significatntly so the current through the motor is effectivly a constant controlled by the PWM signal.
Depending on the type of motor you are using PWM over about 20 Khz should give minimun switching losses in the MOSFETS which are arranged so that they are only dissipating power during the time that they are switching between saturated and unsaturated states and the current through the motor is effectivly linear with the PWM duty cycle. |
| Topic | Author | Date |
| High current Dc motor controller | 01/01/70 00:00 | |
| More detail required | 01/01/70 00:00 | |
| try these ics | 01/01/70 00:00 | |
| for drivers, there is, in my opinion, ONE source | 01/01/70 00:00 | |
| I would use a MOSFET instead of relay | 01/01/70 00:00 | |
| more details | 01/01/70 00:00 | |
| Well i think that Relay is Best Solution for you, | 01/01/70 00:00 | |
| Not suitable - no speed control! | 01/01/70 00:00 | |
| 800 A ??? | 01/01/70 00:00 | |
| Are you sure? | 01/01/70 00:00 | |
| High is relative | 01/01/70 00:00 | |
| you need a H-bridge as has been mentioned | 01/01/70 00:00 | |
| Topology is simple | 01/01/70 00:00 | |
| Tutorial | 01/01/70 00:00 | |
| good info | 01/01/70 00:00 | |
| The +1 karma point came from me,... | 01/01/70 00:00 | |
| relay will work ,but | 01/01/70 00:00 | |
| better power amp | 01/01/70 00:00 | |
READ the question | 01/01/70 00:00 |