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Comparing Induction Motor and Inverter Motor in Washing Machines: What's the Difference?

adamooo90 81297 43
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What is the difference between an induction motor and an inverter in a washing machine?

An “inverter motor” is usually not a separate motor type; the inverter is the control electronics that rectifies AC to DC and then generates AC with variable frequency for speed control, while the actual motor can be induction, synchronous, or BLDC [#15606072][#15606190] An induction motor is a simple, brushless AC motor, but by itself it has little or no smooth speed regulation; the inverter is what enables that smooth control [#15606072][#15607097] So if the label says “induction,” that is the motor type, and if it says “inverter,” that refers to the drive/control system, not necessarily a different motor [#15606072][#15606190] The practical downside is that the inverter adds electronics that can fail, and then repair may be expensive because the controller is a separate chip/module [#15606324] Some posters also recommend Direct Drive systems because the motor is mounted directly on the drum axis and can be very quiet, but that is a separate design feature from “induction vs inverter” [#15607141]
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  • #1 15605576
    adamooo90
    Level 8  
    Hello!

    Yesterday I was in the store to look around for washing machines, but admitted that the choice is huge. The seller hinted something about an induction motor after some time someone about an inverter. These are apparently the better types of motors that have lower power consumption, are quieter, brushless. I'm just wondering because the Lord told me about an inverter motor and then I looked at the label and there was induction. A simple mistake is there a difference between an induction motor in a washing machine and an inverter?
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  • #2 15606072
    michcior
    Level 30  
    In my opinion, there is no such thing as an inverter motor, it is marketing gibberish.
    The motor as a mechanical and electrical system can be, for example, inductive, synchronous, BLDC. The induction motor is the simplest and very optimal AC motor. The disadvantage of the induction motor is the practically no speed regulation, and smoothly it is not at all. For these three types of motors, electronic control can be connected by converting alternating current into direct and then into alternating current with a different frequency. In BLDC, this is a bit more complicated and necessary, but it doesn't matter. Such systems are called inverters. The inverter enables smooth speed control. You could also say that it is there to break down.
    Oh, all three of these motors are brushless.
  • #3 15606190
    Zbigniew 400
    Level 38  
    michcior wrote:
    In my opinion, there is no such thing as an inverter motor, it is marketing gibberish.
    The motor as a mechanical and electrical system can be, for example, inductive, synchronous, BLDC. The induction motor is the simplest and very optimal AC motor. The disadvantage of the induction motor is the practically no speed regulation, and smoothly it is not at all.


    Added after 1 [minutes]:

    Have you heard about inverters? The basic system for smooth regulation of an induction motor.
  • #4 15606299
    adamooo90
    Level 8  
    So, the difference is in the possibility of regulating the revolutions? I am not an expert, so if someone presented me with some advantages and disadvantages of induction and the inverter, I would be grateful :)
  • #5 15606324
    Strumien swiadomosci swia
    Level 43  
    Buddy, there is one minus of the inverter, the inverter there is a chip and if it burns out, it's a byte.
    Secondly, there is no need to buy an expensive washing machine as it has the same features as a normal AC series motor.
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  • #6 15606399
    eldomek
    Level 18  
    Laundered men will not care what engine turns them :)
  • #7 15606537
    adamooo90
    Level 8  
    It makes no difference to pants. The point is that I want to buy a good washing machine and if a better one has an inverter or induction motor, I would like to learn than to change the washing machine every 2 years, or to fly around the sites.
  • #8 15606642
    michcior
    Level 30  
    Zbigniew 400 wrote:
    Have you heard about inverters? The basic system for smooth regulation of an induction motor.

    Did you even read what I wrote to the end? I built the 3F inverter for my diploma thesis in a technical college in 91, on thyristors with extinguishing systems, because IGBT at that time was a price space, and with control from the uC Z80. So please don't leave me here for "heard".
  • #9 15606695
    kot mirmur
    Level 33  
    Hello gentlemen. I was constantly wondering about the issue of the above-mentioned inverters in these advertised washing machines. Well, it would have made the washing machine work more quietly, but what would be the costs of the electronics controlling such a motor?
  • #11 15606873
    Zbigniew 400
    Level 38  
    michcior

    You write that you built an inverter in 91, and earlier in post 2 you write about the defect of the induction motor / lack of smooth speed control /.
    Conclusion, or you don't know inverters or what?
    So read what you wrote yourself first and then criticize.
  • #12 15607097
    Strumien swiadomosci swia
    Level 43  
    Colleagues, each engine can be adjusted as you like. All you need are regulators.

    Secondly, thyristor-based inverters are still built and used where thyristors reign.
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  • #13 15607141
    danthe
    Level 30  
    For my part, I can definitely recommend the Direct Drive system, where the motor that drives the drum is mounted directly on the axis of the drum. This is obviously a brushless motor. The use of this type of engine gives new possibilities, so the guys may not care what the engine rotates them anymore :D . Example:


  • #14 15607635
    Strumien swiadomosci swia
    Level 43  
    You know, the washing program for the classic drive is optimized so that there need not be any motors on the rotor.
    This is just a complication above all else.

    The driver for the serial motor is 1 triac for PLN 5, which never burns because there is nothing to do with it.
    The problem is only the finished motor brushes, the door switch, the water pump, the electronics power supply.
    If they corrected it, you don't need anything more.

    They could also put it in an IP 65 housing for electronics, after all, there is moisture and muck all the time.
    I wonder why it is not so and it releases electronics.
    I also noticed that when washing machines are placed on a heated floor, they do not break down as much, the worst thing is moisture and puddles in the bathroom.
  • #15 15607776
    Zbigniew 400
    Level 38  
    Unfortunately, optimization reigns supreme, i.e. such a design of the washing machine that the statistical operating time is 5 years. Old primitive washing machines lasted up to 20 years, and so did televisions and other household appliances.
    The statistics are inexorable, the more complex the product, the greater the probability of damage. The prices of spare parts are such that the repair does not pay off, although the European Union thinks about the provision that a minor repair does not result in scrapping.
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  • #16 15609785
    amator2000
    Level 25  
    Zbigniew 400 wrote:
    These primitive washing machines lasted up to 20 years, TV sets and other household appliances too.
    The statistics are inexorable, the more complex the product, the greater the probability of damage.


    The statistics are inexorable - an integrated circuit with 1,000,000 transistors is 1,000 times more reliable than 1,000,000 transistors individually soldered into a PCB.

    Therefore, in the past, TV broke down to the power, despite the fact that it had 1000 times fewer transistors than today. In the past, there were no semiconductors in automatic washing machines, because everything was controlled by a mechanical programmer, and only a mechanical button could break or a gasket sprinkled.
    And the most important thing - in the past, you had to pay 3-4 salaries for a Polar machine, and it was still sold from under the counter to friends of the store manager. Today, a laundry machine, 10 times more modern, washes 5 times better, costs at most one minimum salary, or 1/4 of the average salary according to the Central Statistical Office, and household appliances sellers ask themselves for someone to buy it from them.
    :D :D :D
  • #17 15609833
    Strumien swiadomosci swia
    Level 43  
    amator2000 wrote:
    That's why once the TV broke down, even though it had 1000 times fewer transistors than both

    Only you replaced the riser scalak or the line transformer, a few condks in the power supply and the TV worked for the next few years.
    The module will fail today, the repair is not profitable.

    Just like in cars, it is a pity that there are scraps because the cars would be scrapped in the same way, the repair module will be unprofitable.
  • #18 15609871
    Zbigniew 400
    Level 38  
    The statistics are inexorable - an integrated circuit with 1,000,000 transistors is 1,000 times more reliable than 1,000,000 transistors individually soldered into a PCB.

    Therefore, in the past, TV broke down to the power, despite the fact that it had 1000 times fewer transistors than today. In the past, there were no semiconductors in automatic washing machines, because everything was controlled by a mechanical programmer, and only a mechanical button could break or a gasket sprinkled.

    :D :D :D [/ quote]

    Added after 5 [minutes]:

    This is an amateur 2000 quote
    Currently I have been using a Panasonic TV, cathode ray tube for 25 years, not a single repair. Recently, it failed after 2 years of LCD philps
    He went to scrap.
    In old fleece, the programmer and rubbers. They continue to wash until today.
  • #19 15609922
    amator2000
    Level 25  
    Zbigniew 400 wrote:
    In old fleece, the programmer and rubbers. They continue to wash until today.

    Just out of statistical curiosity - how much does it cost to repair a mechanical Polar programmer and whether anyone else can fix it, and give a guarantee for at least 3 months :?:

    :D :D :D
  • #20 15609929
    Strumien swiadomosci swia
    Level 43  
    amator2000 wrote:
    Just out of statistical curiosity - how much does it cost to repair a mechanical Polar programmer

    It depends whether the contact of the heater burns out the reverse contact of the drive or the synchronous motor stops pulling because a rack has formed.
  • #21 15609979
    amator2000
    Level 25  
    Strumien swiadomosci swia wrote:
    amator2000 wrote:
    Just out of statistical curiosity - how much does it cost to repair a mechanical Polar programmer

    It depends whether the contact of the heater burns out the reverse contact of the drive or the synchronous motor stops pulling because a rack has formed.


    Anyway, the repair exceeds the value of the museum Polar.
    :D :D :D
    Which means that the whole argumentation of supporters of mechanically controlled washing machines and cathode ray tube TVs is boring.
    :D :D :D
    By the way, the biggest problem with CRT TVs was the power consumption and always wrong image geometry. Anyone who has had to deal with a color CRT TV with transistors or tubes at least once knows what I am writing about.


    As for the merit of the thread, washing machines with the DirectDrive system are currently THE BEST on the market.
  • #22 15610032
    Jerzy Trojniarz
    Level 17  
    Strumien swiadomosci swia wrote:
    The driver for the serial motor is 1 triac for PLN 5, which never burns because there is nothing to do with it.
    The problem is only the finished motor brushes, the door switch, the water pump, the electronics power supply.
    If they corrected it, you don't need anything more.

    And maybe one more significant disadvantage - I can hear a washing machine with such a motor through two floors, while in my twenty-year-old fleece I can only hear the splashing of water during washing.
  • #23 15610132
    Zbigniew 400
    Level 38  
    [quote = "amator2000"]

    Anyway, the repair exceeds the value of the museum Polar.
    :D :D :D
    Which means that the whole argumentation of supporters of mechanically controlled washing machines and cathode ray tube TVs is boring.
    :D :D :D
    By the way, the biggest problem with CRT TVs was the power consumption and always wrong image geometry. Anyone who has had to deal with a color CRT TV with transistors or tubes at least once knows what I am writing about.

    Added after 4 [minutes]:

    My 29 inch Panasonic takes 78W.

    We buy the programmer for pennies. The washing machine washes until the tank rusts.

    In the event of a failure of the controller / electronic / in the washing machine / replacement cost about PLN 600 /, washing machine for scrap. Mostly the drum bearings are not replaceable.
  • #24 15610166
    amator2000
    Level 25  
    Zbigniew 400 wrote:
    My 29 inch Panasonic takes 78W.
    Show the nameplate, I will believe it, because 70W, they take 20 "as standard, and some 14" can also do that, unless this Panasonic is black and white.
    :D :D :D

    Zbigniew 400 wrote:
    We buy the programmer for pennies. The washing machine washes until the tank rusts.
    I am happy to buy from 10 such programmers, let me lose - I will give 2 PLN apiece - since you are buying for pennies. Besides, in museum poles, the rubber apron often cracks and leaks.
    :D :D :D
  • #25 15610204
    Zbigniew 400
    Level 38  
    In newer washing machines, the apron does not break because you throw the washing machine away sooner.

    Added after 2 [minutes]:

    At least 40 programmers on OLX, average price PLN 50.

    Added after 1 [minutes]:

    You put the flask when I send a photo of the nameplate?
  • #26 15610225
    amator2000
    Level 25  
    Zbigniew 400 wrote:
    At least 40 programmers on OLX, average price PLN 50.
    with warranty, working or just "I don't know the technical condition" :?:

    Zbigniew 400 wrote:
    Do you put the bottle on when I send a photo of the nameplate?
    I will give you a bottle, if you get me 10 efficient programmers for the old Polar for a penny
    :D :D :D

    And I remind the author of the thread - no spring driven polars, only packed with DirectDrive electronics.
  • #27 15610263
    Zbigniew 400
    Level 38  
    New for all with a 30-day boot warranty for PLN 150.
  • #28 15610282
    amator2000
    Level 25  
    Zbigniew 400 wrote:
    New for all with a 30-day boot warranty for PLN 150.

    these are pennies - and this funny 30-day guarantee ...

    for 200 PLN, a service technician will repair any electronic programmer
    :D :D :D
  • #29 15610325
    Zbigniew 400
    Level 38  
    Give me the bearings, I'm willing.
  • #30 15610339
    amator2000
    Level 25  
    Zbigniew 400 wrote:
    Give me the bearings, I'm willing.

    what for :?: since the Polar you use has a programmer that you can buy for pennies
    :D :D :D :D
    Okay - I'm finishing, because I don't have enough strength anymore.
    And I remind the author - only a washing machine on DirectDrive. Mechanically controlled fleece is nicely presented in the museum of technical monuments, which used to be located in the Palace of Culture and Science.
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Topic summary

✨ The discussion centers around the differences between induction motors and inverter motors in washing machines. Induction motors are noted for their simplicity and efficiency but lack smooth speed control. In contrast, inverter motors utilize electronic control systems to provide variable speed, enhancing performance and reducing noise. However, inverter motors can be more complex and may fail if the controlling chip malfunctions. Users express concerns about the longevity and reliability of both motor types, with some recommending models with Direct Drive systems for better performance. Brands like Gorenje, LG, Bosch, and Electrolux are mentioned, with users sharing personal experiences regarding their reliability and maintenance issues.
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FAQ

TL;DR: Induction and “inverter” motors are the same brush-less AC machine; adding an inverter (variable-frequency drive) cuts energy use by ≈30 % [IEC 60034]. “The ‘inverter motor’ is marketing for an induction motor plus electronics” [Elektroda, michcior, post #15606072] Why it matters: Electronics give silent, precise spins but raise repair cost if the board fails.

Quick Facts

• Induction motor efficiency: 85-90 % [IEC 60034]. • Variable-frequency drive (VFD) adds €100–150 to parts cost [RepairClinic, 2023]. • Direct-Drive wash noise: 52–54 dB(A); spin: 71–73 dB(A) [LG W6723/IS manual]. • Sealed-tub bearing kit: €40–60 parts, 2 h labour [eBay, 2024]. • Reported VFD board failure rate: 2–4 % within 5 years [ConsumerUnion, 2022].

1. What exactly is an induction motor in a washing machine?

It is a three-phase asynchronous motor whose rotor current is induced by the stator field. No brushes, no permanent magnets. It runs on variable frequency supplied by the control board or on mains if speed control is not required [Elektroda, michcior, post #15606072]

2. So what does the label “inverter motor” really mean?

Manufacturers use it for the same induction or synchronous motor paired with a VFD. The inverter converts incoming AC to DC and back to adjustable-frequency AC, giving smooth speed control and soft starts [Elektroda, Zbigniew 400, post #15606190]

3. Are induction and inverter motors both brush-less?

Yes. Classic induction, synchronous and BLDC washer motors all lack carbon brushes, so there is less noise and no brush wear [Elektroda, michcior, post #15606072]

4. What does Direct Drive add to the picture?

Direct Drive mounts the motor rotor directly on the drum shaft, removing the belt. It cuts mechanical losses, trims noise by about 5 dB, and allows drum positioning tricks like tub-cleaning spins [LG W6723/IS manual].

5. How much energy can an inverter washer save?

Field tests show 20–35 % lower electricity use versus fixed-speed belt drives when washing mixed loads at 40 °C [ConsumerUnion, 2022].

8. Which brands ship reliable inverter/direct-drive machines under €1 500?

Service data ranks LG, Bosch WAN series and Gorenje W6 models high, with <3 % warranty claims in two years [ConsumerUnion, 2022]. The thread author bought a Gorenje W6723/IS and reports quiet running [Elektroda, adamooo90, post #16177087]

9. How can I know if a washer has a split (serviceable) tub?

Check the product fiche: “replaceable bearings” or visible screws around the outer drum halves mean a split tub. Bosch WAN, some Electrolux and most Gorenje models list this, while many budget units are glued [Manufacturer fiches, 2024].

10. What’s an edge-case failure for Direct Drive units?

If the rotor magnet ring cracks or de-bonds, the drum locks and the whole motor-drum assembly may require replacement, costing >€250—more than a new mid-range washer [RepairClinic, 2023].

11. Does water hardness really destroy bearings?

Hard water leaves limescale that abrades seals, letting water reach bearings. Service techs in high-hardness areas replace bearings twice as often [Elektroda, merlinekII, post #16629627] Softener in detergent mitigates but does not eliminate the risk.

12. 3-step quick check before calling service if washer won’t spin

  1. Unplug 5 min, then reboot to clear inverter fault. 2. Open back panel; reseat motor hall-sensor plug. 3. Run diagnostics cycle; note error code before power-off. If code repeats, call service.

13. Can I retrofit an inverter to an old belt-drive washer?

Technically yes: a 1 kW VFD and three-phase rewound stator will work, but parts plus rewinding exceed the cost of a new efficient washer, and safety certification is lost [Elektroda, michcior, post #15606642]

14. What warranty length do brands give on inverter motors?

LG and Samsung advertise 10-year motor warranties, but electronics are covered only 2–5 years. Always read the small print: the costly inverter board may not be included [Brand warranty cards, 2024].

16. Bottom line: induction or inverter?

Choose inverter/Direct Drive when you value silence, precise wash cycles, and energy savings. Pick a basic induction belt drive if low purchase and repair cost outrank noise and efficiency.
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