Single-Phase Motor: Change Rotation Direction with 3 Wires & Starting Capacitor

Gentlemen, how is it possible to change the direction of rotation in a single-phase motor when 3 wires are led outside, the motor has a starting capacitor?

One of these three tips is the ends of the two working and auxiliary windings. Without changing this connection, you will not change the direction of rotation. If it were a motor with an centrifugal switch, the principle remains the same (changing the connection of the windings)

cane9 wrote-

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Gentlemen, how is it in the end

It is just like the experts write on the forum

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Is it possible to change the direction of rotation in a single-phase motor when 3 wires are led outside, the motor has a starting capacitor?

This is possible because this type of motor has two windings. Working and starting / auxiliary / You only need to swap the start and end of the coil. auxiliary - from which the beginning / or end / is derived from you, and the end / or beginning / is already tightened in the engine! You only need to find them ...

Unfortunately, with a single-phase motor with three leads, it is not possible to change the direction of rotation of the rotor. To do this, four winding ends are brought out.

Oki, it's all clear:
And what Akrzy74 answers, I have already seen here on the forum (I entered this topic in the search engine) opinions of PROFESSIONALS that it is not possible to change the direction when there are 3 wires, so I have already doubted it myself. But thanks for the info

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And who to listen to?

To be precise - if you separate the starting and work windings connected in the middle of the motor and lead the fourth wire outside, then of course it is possible.

ok but there is no such possibility, so crap ??

There is always such a possibility (if the varnish used in the engine allows for safe disconnection of this connection), any rewinder will do it for you.

I urgently need an exemplary electrical diagram of a 1-phase induction motor with a capacitor, which is controlled by the controller (diagram with the option to change the direction of rotation). I would like to see how it is drawn. For help in advance a day

If the capacitor is not permanently installed, the direction of rotation can be changed. In a single-phase motor without a phase shift between the windings there is a pulsating field and the strong field may rotate in any direction. If you spin the shaft fast enough to the right it will start to turn right, if you turn left it will turn left. If you add a capacitor, it will turn, let's say right, and if the inductor, it will turn to the left. Check the impedance of both windings, you will have the answer. greetings

I was just doing a change of the direction of rotation at school on a single-phase induction motor with a capacitor, so as the guides wrote, there are 2 ends for the main winding and 2 ends for the auxiliary winding. To change the direction of motor rotation, we use 2 contactors. When the first one corresponds to, for example, left-hand rotations, then we rotate the other side in such a way that we transfer (duplicate) the main winding and change only the connection of the auxiliary winding ends (change the phase) (HERE I HAVE 4 OUTPUTS-tips)

The diagram is 1 and 3 phase is the same.

I have a request because I have a dirty single-phase motor control diagram that changing the speed could someone correct it and insert a corrected diagram, I will be grateful

for Mintaj18
Hello !
Could this be a rotation switching diagram of a single-phase motor, on the terminal board? (i.e. where the windings are connected).

Regards Stefan

Single-phase motor with a three-wire capacitor can be switched right-left. Measure the resistance of the windings (three measurements in a triangle), they should be equal (if not one direction is privileged). To the two wires we connect the capacitor and the power to the third wire and the second power wire to the capacitor on one side or on the other depending on the direction of rotation. This is how the washing machine motors work (although in this case it is a double motor) and spinning (2900 rpm) has a privileged direction (the one-way motor is more powerful.

I have four wires in a single phase motor with auxiliary winding and a capacitor.
I've been mixing these endings for two weeks now and it always turns to the left.
I think I will convert to three-phase and it will be cool.

if you have 4 wires, no problem.
there are motors with 3 wires in which it is possible to change the direction of rotation. you have to disassemble them and turn the stator 180 degrees.

in order for a single-phase motor to rotate in both directions, it must have two ends from the main and auxiliary windings, if there are only three, then cut and lead out the other end of the auxiliary winding

Hello and I confirm that you can change the direction of rotation of the motor with three wires, recently in our Kaercher dirty water pump, the direction of rotation of the propeller changed automatically and the pump stopped pumping, on the advice of my colleague gsminfo I tracked the starting capacitor and simply cut off the power cable from one of its ends and connected to the other. The pump is now pumping
Little Update - after a few hours it turned out that the engine is overheating and the thermic disconnects it until it cools down and so over and over again, that is, it changed the direction of rotation for a reason, but my friend's gsminfo method is ok

Could colleagues familiar with the issue take a look at this diagram and write what to do to make this engine spin clockwise and counterclockwise?

You have the diagram ready, so what are you asking? The switch, marked "off", alternately closes the opposite contacts in pairs, for clockwise and counter-clockwise rotation.

Krzysztof Kamienski wrote:

You have the diagram ready, so what are you asking?

because I'm not a specialist in electrical engineering. This diagram is from the user manual of the device I purchased a few days ago and has only right spins. The switch has three stable positions. 1-0-2. Position 0 is, of course, the machine is not working, position 1 and 2 are the same speed.
According to the distributor, this device according to specifications have had only one type of turnover for at least a few years. Where did my question even come from? Well, one machine, coming from the same distributor, has clockwise and counter-clockwise rotation, which caused a lot of interest and questions like, why.
Moreover, machines of this type usually have a switch with a left rotation position, monostable, for temporary use. If the diagram is correct, then after the warranty period I would like to (a specialized workshop) have both right and left.

PS The diagram does not necessarily correspond to reality. I can't check it yet.

@ witek1965 So I will answer straight my colleague. Yes, this motor can easily change the directions of rotation by changing (inverting) the connection of the main and starting winding wires (the one with the capacitor).

So, to sum up, after the warranty period, I can contact an engine specialist and he will connect me in such a way that I will also have right and left rotation in my machine.
Cool. thanks for the answer.

@ witek1965 Yes, by connecting a three-position switch according to the diagram.

It follows that the one piece that came in was connected correctly, according to this schema and the rest not. Probably the same manufacturer produces the same device model for different distributors with different specifications. Some have the so-called revers, others are connected differently as in this diagram and they simply do not have it. Or a series of faulty switches, but that's rather impossible, not for several years.
Considering that mine, and not only, the machine rotates only in one direction, position 1 and 2 is bridged, not connected according to the attached diagram.

Hello, I am sorry for reheating the cutlet, as a rule I read but I do not want to damage anything. I have an engine from an apparently old, still Soviet vacuum cleaner, but it works. There are 4 wires coming out of the winding, of which a capacitor and a brush are connected on one side, and the same on the other, and the third wire goes to the housing. What is it because I am more of a visual learner than an electrician, but I am not quite a layman, but I can do something there. The engine spins clockwise and my dream would be it spins counterclockwise. which wires do I have to change. Please help.

Hello - please swap the wires coming from the coils (motor stator)
which are connected to the brushes.

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This is a series motor as in a hand drill.

So this wire, which goes to the right brush in the first photo on the left, should be connected to the left brush, and the wire from the left brush to the right. On the principle of "kali to eat" capacitors remain unchanged?

Just as you write, here is a diagram of a drill with a ready switch.

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