Tacho sensor in a washing machine: tachogenerator, Hall sensor
A tachometer, also known as a tachogenerator, is necessary in order to take into account the number of revolutions. In addition, it also measures the generated voltage. These are very important indicators that need to be taken into account correctly. Controlling these parameters allows you to maintain the functionality of the machine and correctly perform all modes and programs. And in addition, it helps protect the washing machine from many malfunctions.
When the tachometer fails, uncontrolled rotation of the drum occurs. That is, the number of its revolutions may differ from the required one. This can be noticed when the machine malfunctions when spinning washed items.
The drum can rotate as necessary to perform this mode. When the washing machine operates, the rotor rotates. And an alternating electrical voltage appears. Data about it is sent to the control module. It analyzes the information received and makes a decision to speed up or slow down the drum rotation speed. If the rotation speed matches the required one, then he can leave it as is. In this way, the operation of the machine is monitored as all specified programs are executed.
Some modern brands of washing machines, which are distinguished by high quality and reliability, use Hall sensors instead of a tachometer. They are installed in the electric motor.
The following manufacturers typically use such devices:
- Siemens,
Bosch- and others.
This part has rather modest dimensions. When installed, it is fixed on the stationary part of the electric motor. Its job is to monitor the magnetic field generated during rotation. This sensor has three special pins. They provide the data necessary to control the number of revolutions to the electronic control module of the washing machine. In accordance with this data, the module decides whether it is necessary to increase or decrease the drum speed.
Tachogenerator failure
If you decide that the tachometer is broken, then you should not rush into further actions.
First, let's look at other possible causes of the problem:
- First of all, pay attention to the key that turns on the spinning of the laundry. There is a possibility that it is jammed. And this is what caused this problem.
- Check how securely the tachogenerator is secured. The washing machine vibrates during operation. These vibrations could weaken its fastening over time.
- Check the contacts with a tester (multimeter). In the inactive state, the normal resistance would be one that is close to 70 ohms. If the resistance changes when the motor shaft rotates, then our sensor must be working.
- Another reason may be a lack of grounding. If some of the charge from the drive belt gets onto the engine pulley, the engine's operation may become very unstable.
Check for these breakdowns. If they are the whole reason, then when you eliminate them, the washing machine will work normally. If after eliminating these faults the problem remains, then either the electronic control module or the tachogenerator is broken.
In neither case do we recommend changing the part yourself. We recommend leaving this work to specialists.If you are confident in your abilities and have the necessary skills, then you can do all the work of replacing the tachometer or module yourself.
Interesting:
17 reader comments
Good afternoon everyone! I have a problem of this nature, I turn on the machine for the first time, while it is all cold, it runs the entire cycle of any program at 5, interesting things later. I set the program, it washes, but before the rinse mode, i.e. it turned on, rinsed, drained the water and... spins the drum indefinitely at one speed, but it is clearly lower than usual and nothing else happens, I checked the engine, it seems hot but my hand is tolerating it. I checked the tachogenerator, the parameters match your 70 ohms, etc.. Can you tell me what??? Thanks in advance.
It all depends on the brand of your SM. On old Samsungs, the relay for high engine speeds failed. Good luck.
My tachometer gives 530 ohms, is this normal or not. (I know that it is available at 165 ohm.) The Zanussi FA 1023 washing machine either tries and fails, sometimes it doesn’t even start, or it keeps spinning, in general, everything is somehow not clear, what’s wrong with it?
On the Whirlpool AWG328/1, the tachometer has a resistance of 520 Ohms, and when the magnet inside rotates, the resistance changes slightly. Is this the normal state of the sensor? Sensors on sale with suitable dimensions internal D=24mm external D=39mm H=12mm have a declared resistance of 70 Ohm...
Thanks for the tips. I turned it over, checked the contacts, put the washer back in place and it started working. There was an error 3E.
Good evening, I have the following problem with the Indesit washing machine: at the very beginning, the machine fills the tank with water (soaks things) and drains the water. Refills the water, turns the tank 2-3 times and starts draining! It shouldn't be like this! And the drain occurs until it is unplugged from the outlet. Can you tell me what the problem is? Thank you very much in advance!
And after the failure of the Indesit wil85 washing machine, the door (lock) indicator and the easy ironing indicator blink, I will be very grateful in solving this problem!
Good day! My tacho shows 37 ohms, is this normal?
Good evening! I have a problem with my Hansa machine; almost every wash it gives me error E08. The washing machine stops and does not spin, the filter is clean, we check the doors. Can you tell me what this could be and how to fix it?
Good evening! Kandy machine compact front loading! Recently a problem appeared with the spin cycle - it does not give an error and ends the program normally (End is displayed). The laundry remains wet! When I choose to just spin, it may work, but it may not! I start it without underwear - it works fine with a set of revolutions! When loading laundry, depending on the quantity and weight, it may remain wet! Before that I changed the heating element!
Try without things, I also changed the heating element on Virul. The problem was the uneven layout of the linen. A wool sweater is saturated with water and overloads.
My LG has 2-6 washes and the tachometer is flying. Can you tell me the reason?
Hello! My HANSA machine (manufactured in 2004) starts washing and after the drum makes a couple of revolutions it gives error E21. We checked the tachometer for resistance. 228 Ohm, its dimensions are d20/D31/H13mm. Is it correct?
My Samsung Bio Compact does not spin the drum, I can’t find the tachometer. The error shows that he is. Help.
Please tell me, Miele w3240 washing machine. It turns at maximum speed when turned on, the resistance of 265 Ohms on the tachogenerator is normal and what should it be for this model? I've looked through a bunch of resources - I can't find them, please help!
Good afternoon. Tell me the reason! I have an Indesit wi82 washing machine. The entire specified washing cycle occurs well, without any failures. But as soon as the spin starts, it does not automatically turn off, but continues to spin. I turn it off manually. What's wrong? Thank you in advance!
My LG changed 4 hall sensors in 2 months. What is the reason for the sensor failure?
I have a Samsung s821, the engine initially burned out, I found a used one and installed it. He started turning at such a crazy speed, he checked the tacho sensor. Both on the old engine are 40th, and on the new 40th. I don’t understand which relay is responsible for the tacho sensor?