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I would use an op-amp mounted as a differential amplifier with a gain below 5/24.
But your power supply must deliver a wider range of voltages than 0v - 24v like -5v - 28v, or eventually use a rail-to-rail op-amp.
You're certainly right. 50Hz current impulsions could create undesirable effects. Problem with DC is the cost. MOSFETs are much more expensive than SCRs for the same voltage/current rating.
I didn't know about torque proportionnal to I² (that's interesting because I need the more torque I can...
If you've never done this before, I would recommend you to head for specialized integrated circuits like the DRV8825.
It's the best way to have smooth motion, and avoid doing any damage to the motor. Moreover, the current limiting feature let you use higher voltages than the steeper would carry...
Treez, i think you are refering to phase angle control ;)
Chuckey, problem with relays is the lifespan. As I only need ~110v, I also thought about a derivative of your 4-triacs bridge using two thyristors and two diodes, so I could perform phase angle, and direction control, simply by choosing...
Hi,
I'd like to design a circuit able to control the torque and the direction of a universal motor.
I know the direction isn't supposed to be changed but the motor will run at very low speeds or even motionless.
To avoid overcurrent, i'll bridle it to 110v even if the mains will be 220v AC 50Hz...
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