Automatic speed control of dc motor from ac supply

Projects General Guidance
1

hi everyone

i recently took up a project and this is it. controlling the speed of a
small DC motor to vary automatically (not manually) over a short time interval. During this time
interval the speed must increase and decrease. The time interval can be anything from 15 seconds
up to 45 seconds. The length of the time interval will depend on the problem you want to solve. It
can also emulate the solution for problem over a longer time interval, but then the time interval
should not be longer than 45 seconds. The circuit you must build will have a 230V AC supply.
The DC output voltage of your circuit must not increase above 180 V. You must design and
implement this on a DC motor in the lab, rated at 375 W.

2

??? Forum is not building any circuitry for You.

You can post in section for paid jobs, not here.

3

Requirements don't make much sense, what is this? School project?

4

Definitely a school project:

Reads like a school project to me.

@minionsjack you need to put some effort into this yourself before you get help on the forum. People don’t mind helping you, but the forum members don’t want to do your schoolwork for you.

5

I have to wonder how someone will be able to detect a motor slowing or speeding up with no mention of any speed sensor.

6

That sounds like an interesting project that could be a lot of fun! However, please keep in mind that we are not a free design or code-writing service. We’re more than happy to help with your design or code, but we need you to make an initial attempt. Please design and write your code, then post it along with an explanation of what’s not working properly. There is also a for hire section if you want to pay for it.

I would assume the teacher/professor expects you to learn how to do this and understand what you did. This is basic material and if you do not master this you will have an increasingly difficult time.

  1. Show Your Work First: Before asking for assistance, make an attempt to design or write the code yourself. Share your work along with details about what isn’t working. That includes a preliminary schematic that you drew.

  2. Provide Clear Documentation: Since we can’t see your project, share an annotated schematic (best) or a clear drawing of your setup. Clear Pictures are welcome, but avoid using Fritzing diagrams as they are wiring diagrams, not schematics, and are not ideal for troubleshooting.

  3. Include Technical Details: If there is specific hardware involved, include links to technical information. There are often many versions of similar components, so precise details are essential. Many times the processor is assumed, please state which one and post a link to it.

  4. Reference Resources: For additional help, check out useful links and tutorials: Useful Links on Arduino Forum. Of course one of the better sources of information (in my opinion) is the Arduino Cookbook. Skim it cover to cover and stop on any project that interests you.

7

Those are very advanced design goals, intended for someone studying relatively high power AC and DC circuits at the college EE level, second or third year.

If that description does not reflect your situation or background, I suggest to pick a less challenging and less dangerous project.