| ??? 09/20/05 06:55 Read: times |
#101245 - Please Say Sensing stop ....Please Responding to: ???'s previous message |
Pratik said:
You could use a time duration with a little experementing but this will need a really tolerant motor else you may burn the winding if you continue driving it beyond end position of the valve.
According to the data in 'More!' post i think danger of this method and using Microswitch is the same. A better option is to insert a shunt in the motor path and sense the current which dramatically increases when the motor stalls. Use the voltage drop across the shunt as a stop signal for the processor. You might need to do a little calculation based on the hardware, the motor, you plan to use. I agree totally with you,And for this reason i wanted to use 89c2051, but how?The motor winding resistor is small so for using a shunt resistor it must be small too that is meaning increase of power dissipation The easier way out is to use a motor with friction clutch more popularly called slip mechanism. You can get hold of a "Window winder motor" from one of the car accessories dealers and the 'on-time' shall do the rest for you. Unfortunately the motor and valve is in one package and i only have 2 wires for controlling this pack! Hope this helps Indeed I must say Thanks Dear Pratik Mehdi |
| Topic | Author | Date |
| Sensing Stop Point of a DC Motor! | 01/01/70 00:00 | |
| I doubt that, the time it takes a motor | 01/01/70 00:00 | |
| More! | 01/01/70 00:00 | |
| You can sense the stops by measuring the | 01/01/70 00:00 | |
| I to V? But | 01/01/70 00:00 | |
| SHUNT | 01/01/70 00:00 | |
| You missed the important point! | 01/01/70 00:00 | |
| Listen to Erik & Andy | 01/01/70 00:00 | |
| Another Approach! | 01/01/70 00:00 | |
| Not reliable | 01/01/70 00:00 | |
| you don't get it, do you | 01/01/70 00:00 | |
| Stop sensing for DC motor | 01/01/70 00:00 | |
| Please Say Sensing stop ....Please | 01/01/70 00:00 | |
| Sensing Stop -:) | 01/01/70 00:00 | |
| no........ | 01/01/70 00:00 | |
| That is not the big risk | 01/01/70 00:00 | |
| I've seen it all before! | 01/01/70 00:00 | |
| Thanks Russel And Erik | 01/01/70 00:00 | |
| CYA | 01/01/70 00:00 | |
| Why did the original driver fail? | 01/01/70 00:00 | |
It Works proper but.. | 01/01/70 00:00 |