Washing Machine Motor Agitator Timer Circuit

The article details a circuit design for controlling a washing machine motor agitator through a preset time sequence which also includes an alternate reversing of the motor rotation. The circuit was requested by Mr. E.Rama Murthy.

The Circuit Request

Dear sri. Muzumdar,

I am having old washing machine which is good working till now. Of late, its PCB has gone and I am not able to get it locally.

The mechanical/electrical working is good. The timer is electrical-mechanical and is working okay. What I need is a circuit or your made-item with the specifications as below.

It could work on 220 volt ac or I can provide 5Volt dc supply thru local power adaptor. The unit should have for operating of motor, 2 nos separate relays for running the motor forward and reverse.

The timing for the operations of relays is 2 secs stop and 5 secs forward and 2secs stop and 3 secs reverse. This is for working of clothes agitation process.

The motor is 0.5 hp. I should be able to enclose it in a box which is water-proof. Kindly let me know how much I should send you by way of bank transfer, which should include your packing and forwarding charges.

Thanking you in advance.

E.Rama Murthy., Visakhapatnam., A.P.

Designing the Circuit

The proposed washing machine motor agitator controller circuit functioning may be understood as explained below:

When power is switched ON to the circuit, pin15 of IC gets reset by C1, rendering a high at its first pin#3 which is the first pinout in the order of sequence for the IC 4017.

The above high logic at pin#3 instantly passes through C2 causing a logic high at the input of N1 which in turn causes a logic high at the output of N2.

The above situation keeps T2 and RL/1 switched OFF.

Now after a predetermined time of 2 seconds which can set by appropriately selecting the values of C2/R2/R3, C2 becomes fully charged rendering a logic zero at the input of N1 which instantly changes the states at the outputs of N1/N2 causing a logic zero at the output of N2 which in turn switches ON T1.

T1 passes a short positive pulse via pin#3 high across its emitter/collector to pin#14 of IC1.

The above pulse clocks IC1 so that the logic high pin#3 now shifts to the next pinout in the order, pin#2.

The above high at pin#2 identically passes on at the input of N3 rendering an instant low at its output. This low triggers T2 and RL/1 activating the motor in a particular direction depending on the wiring of RL/2 contacts.

N4 holds the above logic state until 3 seconds is lapsed which is determined by the values of C3/R7, after which N4 reverts its state switching ON T3, which causes a short pulse to pin#14 of IC1.

The above pulse once again clocks IC1 so that the logic now shifts from pin#2 to pin#4 in the order of the sequence.

Pin#4 high yet again repeats the first sequence which was implemented when the logic was at pin#3.

The above conditions deactivates RL/1 and the motor for another 2 seconds.

After the above 2 seconds has elapsed, T1 switches ON providing a pulse to pin#14 which results in the shifting of the sequence to pin#7.

The high at pin#7 yet again switches ON T2/RL1 and also RL/2. However this time the motor changes its rotational direction due to the activation of RL/2.

C4/R11 values make sure that the above condition stays ON for about 5 seconds. After 5 seconds T5 performs the clocking of pin#14 which shifts the sequence to the next pinout order that is at pin#10. Since pin#10 is connected to pin#15, the situation instantly bounces of and resets back to pin#3....and the cycle repeats.

Circuit Schematic

 

 

 

Parts List for the above washing machine controller timer circuit

R1, R4, R5, R6, R8, R9, R10 = 10K
R2, R3, R7, R11, C2, C3, C4 = TO BE DETERMINED BY TRIAL AND ERROR
R12 = 100K
C5 = 33uF/25V
T1, T3, T5 = BC557
T2, T4 = 2N2907
D1----D10 = 1N4007
N1----N6 = IC 4049
IC1 = 4017
RL/1, RL/2 = 6V/100mA RELAYS SPDT

How to Wire the washing machine motor connections.

As shown in the above diagram, the motor would have three wires, one of them would be the mains input while the other two for the flipping action or for reversing the motor directions.

You would want to take the help consult a qualified washing machine repair technician for confirming the exact wire inputs before connecting them with the circuit.

25 thoughts on “Washing Machine Motor Agitator Timer Circuit

  1. Have questions? Please feel free to post them through comments! Comments will be moderated and solved ASAP.
  2. will you draw a circuit for my washing machine motor that runs it 15 seconds forward then stop it for 5 seconds and then run it 15 seconds backward and then stop it for 5 seconds and repeat this cycle for 15 minutes continuously.
    pls. help me.
    thanks
    Manish Gupta

  3. sir, i am not an electric engineer i don't know how to connect ic 4049 would you tell me how to connect it ( from which pins i connect it ) please tell me. can i use another ic instate of ic4017 and ic4049 as it is not available in market

    thanks

    • Hi Manish, I am sorry, If you are not reasonably expert with electronics then you must not try the above circuit because the circuit may involve and call for precise testing operations, adjustments and tweaks, until it finally serves the purpose….

    • you can check the datasheet of the IC, you will find 6 triangle shaped gates in it having single inputs and outputs….use these gates as shown in the above diagram

      all the gates are identical so these can be configured as one may choose…just make sure the input and the output pins are correctly positioned….also identify the (+) (-) of the iC and connect those with the supply rails…

    • yes yuo can do it in that way…….other than the gates look for the supply +/- pins of the IC and connect them accordingly…. ignore the rest of the pins.

  4. Dear Swagatam
    will you tell me approx what capacity of R2, R3, R7, R11, C2, C3, C4 should i use for my purpose as given above
    can i use variable resistors instate of R2, R3, R7, R11 if yes then what capacity of variable resistor should i have use.

  5. HELLO Hope you will be fine.
    sir i have final year project in this semester that is fully automatic washing machine.we buy a old body of that machine and remove controller of that machine. because we are going to programing on repberi pi. to control that machine. sir we have issue regarding controller circuit i mean how we can make that and also issue in universal ac motor controllering. if you can regarding this point so we will very thank full to you

    • Hello,

      please provide all the details regarding how the motor is supposed to move…and I think a DC motor will be more easy to operate and control than an AC motor.

      DC motors are easier to control either ways (reverse and forward) compared to an AC motor



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