Hello every body:
Here is my concern:
I have chosen a motor to exert a force on an object. the motor is an electric winch (12 v and about 6 amps drawing current for 150 lbs up to 20amps). Well the key of this project is to get the motor to apply only 150 lbs, then hold the force for 1 second and then release the force. This procedure will be repeated for a certain amount of time.
Here it is how i think i can do it:
1. have a swith to be an input to microcontroller
2. then the output of controller will be high when switch is pressed
3. To drive the current i think a mosfet can do it with the motor's specs
4. Try to use current sensing circuit as a feedback to microcontroller to check if force is 150lbs
My main question is how do i limit the current through the motor for a desired force. For instance, lets say i want 100 lbs which is proportional to current through motor and in order to produce 100lbs i need 4 amps then my current limit will be 4 amps. The winch will keep drawing current until the supply voltage is reached.
Any suggestions, improvements, Is the feedback good or not?
I appreciate every comment
Here is my concern:
I have chosen a motor to exert a force on an object. the motor is an electric winch (12 v and about 6 amps drawing current for 150 lbs up to 20amps). Well the key of this project is to get the motor to apply only 150 lbs, then hold the force for 1 second and then release the force. This procedure will be repeated for a certain amount of time.
Here it is how i think i can do it:
1. have a swith to be an input to microcontroller
2. then the output of controller will be high when switch is pressed
3. To drive the current i think a mosfet can do it with the motor's specs
4. Try to use current sensing circuit as a feedback to microcontroller to check if force is 150lbs
My main question is how do i limit the current through the motor for a desired force. For instance, lets say i want 100 lbs which is proportional to current through motor and in order to produce 100lbs i need 4 amps then my current limit will be 4 amps. The winch will keep drawing current until the supply voltage is reached.
Any suggestions, improvements, Is the feedback good or not?
I appreciate every comment