Current regulator Circuit

Could someone suggest me to control the current being supplied to the brake?Voltage set for the braking coil is around 7 Volts with no current supplied.I wish to gradually increase the braking current so that torque applied will be smooth.

 

In order to control current, you need to measure it and have a way to correct. There are many ways to measure the current, including current sense resistors, hall-effect sensing, inductive, etc. You need to know the range of currents that you are interested, then design an appropriate measurement scheme. For high precision and if you are willing to lose a bit of efficiency, then a resistor is the way to go. You can measure across the resistor (with gain) to figure out the current.

Then, you can raise or lower the applied voltage or PWM. Ideally, this would be done in a PI or PID loop.

I don't understand that your coil is recieving 7V and there is no current being built up. There must be a mistake with that bit of information.

Steve

 

Steve I have duplicated the post.Sorry.