Need help expert guidance please

Hello all,
I am a doctor and hence not well versed with this field at all. However I stubled upon this educative forum while searching for a specific query.

I have an electrical massage chair (which was earlier powered by an Class2 transformer adapter supplied by the manufacturer-Input 110V 60HZ Output 24V 1Amp-I have a picture if needed).
With this, the motorised massage chair (with variable speed on remote) was working perfectly well.

I have relocated to a place with 220V input & also the bigger problem is that in this shifting I have lost the original 110V adapter mentioned above.

Can anyone suggest how to get this chair to be in use again.

The only power supply I could find was a 24V 3A adaptor (the laptop adaptor type) & the shops were insistent that 24V with anything more than 1Amp would work perfectly.

With my LITTLE knowlege of physics from college I find it difficult to beleive that 24V1A requirement
of Class2 transformer would work perfectly well even with a 24V3A laptop like adaptor.

I hope that someone of u can explain that since the 24V DC requirememnt matches it it OK to run the motor with 3Amps supply instead of the previous 1Amp supply of the previous transformer.

I agree with the suggestion. A 24V DC adaptor with 1 A or higher current rating should work, because it's essentially a constant voltage supply (similar to a 24 V battery) and the motor takes only the current it needs, usually less than 1 A.

The suggested replacement is surely a switched mode adapter, it behaves partly different than a transformer power supply, e.g. if the motor has a large inrush current. There's a certain risk that a switched mode adapter has problems to start the motor, but that's less likely a problem if the adapter has larger current rating. A practical test will be necessary in any case.

Thank u so much for the prompt reply.
I need a little more clarification from ur reply.
From ur reply, I gather that I can go ahead with testing the newly bought 24V3Amp adapter to work with the motorised massage chair. (the picture of the attempted replacement adapter is attached with this-Please see it if it is OK)

Is there any risk of damage to the motor/rollers in the chair (thats my only concern)
The adaptor cost is barely a few dollars (so it is immaterial)

Lastly I did not understand what u meant by "switched mode adapter"
Is it some modification to be made to this new adapter or is it something to be bought afresh.
Thanks

That adaptor will almost certainally be fine.

Switched mode refers to the way that modern power supplies are made (using internal power switching devices to create a high frequency for the very much smaller transformer that can then be used), the old supply used a low frequency transformer which is larger and heavier but conceptually a much simpler component. It is pretty much an implementation detail.

Give it a go, I don't forsee a problem.

Regards, Dan.

A higher current adapter will certainly drive the motors. The only potential problem with a higher current rating is that the motor may produce quite a bit more torque when loaded. That could be a good or bad thing, but for a massage chair I doubt it's a big problem. If you're really worried about it, then you could put a 1A fuse in series with the motor.

The 24V 3A adaptor will work fine, just make sure the + goes to + and the neg to neg,

Orson Cart, BE (E&E) power electronics engineer.