I'm pretty new at this. I was able to salvage the motor of a washing machine. How will I know if I can reverse the rotation of it? And how will I be able to reverse it if it does?

Also how will I know if this is an induction motor? Single Phase or 3 Phase?

It doesn't say anything like that on the name plate.

Here are the details on the name plate.

Welling YXB170-4B RMOTS0007PLZZ
220~240V 50/60Hz
170W $P
1.4A CL E


It has some sort of diagram on the right.

11 uF/450V then BLUE(CCW), BLACK, RED(CW)

Washer Motor


I opened a box where the wires go to and this is how it looks like inside.

enter image description here

Unfortunately when I opened it, there was a spring that jumped out and messed somethings inside. I tried to put things back together as best as I could but not really sure if I did everything right. At the moment, I would not dare plug it to an electric socket as I don't want it to blow up in my face or something :D.

Is there anyway to run this off using a battery? Hopefully this would be safer.

Appreciate it if someone to guide me thru it.

UPDATE 2018/05/19:

After messing up the box with all the gears, I'm a bit afraid of plugging it to the power since I'm unsure what will happen. Anyways, I would like to ask for some assistance. Here are a couple more images which I'm hoping to help me explain what I need to do.

Figure 1.0 Figure 1.0

In the image above, I labeled the objects based on my understanding.

A - Motor
B - This was the box that had the knob for turning the washing machine on.
C - Capacitor. Label says "SH CAPACITOR. SH.M 400 VAC 50/60Hz 11uF (-5/+10%) NUINTEK/KOREA".

Figure 2.0 Figure 2.0

The image above is a close up on the box (B in Figure 1.0). I labeled somethings that I have concerns with.

A - A metal that connects to a white wire that connects to the power (not sure if positive of negative)
B - A metal that connects to a blue wire that connects to the motor.
C - A metal that connects to a red wire that connects to the capacitor and motor. A black wire then connects the capacitor to the power.

My questions:

  1. The metals (Figure 2.0) B and C are currently not connected to metal A. I haven't tried it yet but my guess is if I plug this to power, nothing will happen since these metals (B,C) are not connected to metal (A). If I want to turn the motor on, should I have metal (B,C) connected to metal (A)? If so, can I connected them permanently?

  2. If I wanted to reverse the rotation, should I connect the blue wire to the capacitor instead of the red one?


  • 1
    \$\begingroup\$ I'd say this is a single phase motor with 3 cables that can be connected like shown in the diagram. Connect your phase to either the blue cable for a counter-clockwise rotation or to the red one for a clockwise rotation. The neutral goes to the black one. \$\endgroup\$
    – po.pe
    Commented May 18, 2018 at 5:38

2 Answers 2


The motor is a single-phase induction motor of the permanent-split capacitor type. It is called permanent-split-capacitor because it is a split-phase motor with the capacitor permanently connected rather than connected for starting and disconnected after the motor comes up to speed when started. The diagram on the label that shows the windings and capacitor indicates that to people familiar with single-phase induction motors.

The label also shows how the power is connected for clockwise (CW) and counter-clockwise (CCW) rotation. That is described in the comment by Humpawumpa. The neutral of the power source is connected to the black wire and the hot wire is connected to either the blue or red wire for either CCW or CW operation.

To run the motor using a battery, you need a power inverter that converts the battery DC voltage to 220-240 volt AC voltage. The inverter must be capable of supplying 1.4 amps at 220-240 volts continuously. It also needs to provide a higher current for a second or so while the motor is starting. That higher current may need to be as much as 10 amps. Operating with a battery is not safer than operating directly from 220-240 volts AC.

Reversing the motor without waiting for it to coast to a stop would be the most stressful operation for an inverter. It would also be stressful for the motor. The motor may or may not be designed for that. The washing machine timer limits how it is reversed and how often it is started. The motor is likely not designed for more stressful duty than allowed by the washer timer.

  • \$\begingroup\$ I was planning on using this as the motor for a DIY automatic gate opener. Kindly let me know if this motor would be sufficient for that task? \$\endgroup\$
    – ads
    Commented May 18, 2018 at 14:57
  • 1
    \$\begingroup\$ There is a good probability that the motor will be suitable. You need to analyze the gate and opening mechanism to determine how much force is required and convert that to torque at the motor shaft. It might be helpful to have the kind of scales used to weigh luggage. That is mostly mechanical engineering. \$\endgroup\$
    – user80875
    Commented May 18, 2018 at 15:11
  • \$\begingroup\$ Thanks. I plan on using either a bike or motorcycle chains, sprockets, angle bar and v-groove wheels. Then use something like lazada.com.ph/products/… as the remote to open and close the gate. But first I need to figure out how to reverse the rotation so that I can also use it to close the gate. \$\endgroup\$
    – ads
    Commented May 18, 2018 at 15:34

Answer to Q1: B or C, NOT both. you will burn the motor out.

,, ,, Q2: Both wires are connected to the capacitor. You just swap the supply lead from one to the other. I knew that type of motor as a 2 phase motor. There are 2 identical windings inside phased at 90 degrees. One connected to the blue wire, and the other to the red. The black is the common. Which ever one the supply is connected to becomes the run winding, and the one fed through the capacitor acts as the start winding. The current through a capacitor leads the voltage by 90deg., so the field in the start winding poles leads, then shifts to the run winding poles, creating a spinning field which the rotor follows. Swapping he supply to the other side of the capacitor reverses the roles of the windings, and direction of the field.

The motor will be plenty powerful enough to open the gate, unless it's a bloody big one. Suddenly reversing the motor won't do any harm. Security might be a problem without a brake or automatic latch to stop people pushing it open.


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