How to start a stepper motor without electronics

I have a lot of different office equipment that went out of order. I do not dare to throw it out, but it will come in handy. It is possible to do something useful from its parts. For example: a stepping motor, which is so common, is usually used by do-it-yourselfers as a mini generator for a flashlight or something. But I almost never saw it used as an engine for converting electrical energy into mechanical energy. It's understandable: to control the stepper motor you need electronics. You can't just connect it to voltage. And as it turned out, I was wrong. A stepper motor from a printer or another device, it’s pretty easy to start from AC. I’ve got such a motor.
How to start a stepping motor without electronics
How to start a stepping motor without electronics
Usually they have four outputs, two windings. In most cases, but there are others of course.I'll take a look at the best way.

Stepper motor circuit

Its winding pattern looks like this:
How to start a stepper motor without electronics
Very similar to a conventional asynchronous motor circuit. You will need:
  • Capacitor with a capacity of 470-3300 uF.
  • 12 V AC power supply.
We close the windings in series.
How to start a stepper motor without electronics
Twist and seal the middle of the wires.
How to start a stepper motor without electronics
Connect the capacitor with one output to the middle of the windings, and the second output to the power supply to any output. In fact, the capacitor will be parallel to one of the windings.
How to start a stepping motor without electronics
How to start a stepper motor without electronics
Apply power and the engine starts to spin.
How to start a stepper motor without electronics
If you transfer the capacitor output from one power output to another,then the motor shaft will begin to rotate in the other direction.
How to start a stepper motor without electronics
Everything is extremely simple. And the principle of operation of this all is very simple: the capacitor forms a phase shift on one of the windings, as a result, the windings work almost alternately and the stepping motor turns. It is a pity that the engine speed cannot be adjusted. Increasing or decreasing the supply voltage will not lead to anything, since the revolutions are set by the mains frequency. I would like to add that in this example a DC capacitor is used, which is not quite the right option. And if you decide to use such a switching circuit, take an AC capacitor. You can also do it yourself by switching on two DC capacitors in a counter-sequential manner.

Date: 09.10.2018, 12:46 / Views: 52462

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