The motor is rated for the local voltage as well, so it would also need to be changed.

@demetriosx27422 I don't see any parts mentioned in your comment. The instructions for replacing the board are the same between the US and EU versions. If you go to the repair parts lists and find one for a 220-240V model (usually start with the number 5) then you can get the part number for the replacement board for 220V-240V/50Hz.

From what I have seen, there isn’t a discrete sensor to detect line frequency. Far more likely it is either the microcontroller detecting the frequency or it is built into one of the other chips on the board (maybe U1, which appears like it might be the SMPS controller IC). If it is the microcontroller, which I think is the most likely option, then the firmware would have to be modified and/or a replacement microcontroller soldered to the board. If it is a different chip like U1, then first we would have to identify the right chip, figure out the chips ID, and then hope there might be some info on how to configure online somewhere. In the end, I don’t have any good answers beyond that. For most non-technical people, it would be far easier to just replace the board.

You will need to find a KitchenAid parts store that ships to your country. Sorry, I don't have any advice beyond that.

Unfortunately, I just saw this. The AC and DC motors are a similar size/dimensions, but I can't guarantee they are the exact same size nor can I determine if they have the same locations for the mounting holes. If they do, then replacing the motor and control board are all you need to do to convert things over. You do lose the 1/2 speed used for folding ingredients but otherwise I don't see any downside.

This is a known issue with this style of attachment. Dirt/grim/etc. can get in between the planetary and the rod that attaches the planetary to the transmission. The most common solutions are penetrating oil (e.g., Kroil or similar), heating the part with a heat gun to try to soften what is binding the planetary, hard mechanical force, and/or a combination of one or more of these.

Sorry for the delayed response, is the board your purchased a 220-240V version or a 120V version? If it is a 120V version, plugging it into 220V will blow the board. If it is a 220-240V version, then you should be fine.

Sorry, I don't live in Europe. So I don't know of any reputable parts places there.

The same issue was mentioned in a comment above. So far, I have not heard of any successful reports of someone using a voltage transformer with these models of mixers.

The speed/motor control board in these models is far more advanced than in the old models. There are two possible causes: First, with the speed/motor control board being more advanced, it might be a lot more sensitive to voltage sag due to the transformer. Second, and more likely, the motor control board is detecting the 50Hz line frequency and stopping the mixer.

Since I haven't seen anyone able to use a voltage transformer with this model, it is likely that your only solution is to replace the motor, speed/motor control board, and the power cord. The standard European equivalent to your model (meaning it has the Euro power plug) is the 5KSM70SHXE. The part number for the motor is W11480076, speed/motor controller is W11512563, and Euro power cord is W11459270. If your country doesn't use the standard Euro plug, let me know and I'll help.

@hannah72826 There are a few issues here. First off, the model you suggested is a KSM60, while yours is KSM55. Second, in the USA KitchenAid mixers are rated in quarts (so KSM55 = 5.5 Qts, KSM60 = 6.0qts, etc.). In Europe, while they use liters to rate their models, the model numbers don't change.

All that being said, this isn't actually a deal breaker because the models share the vast majority of internal parts. Based on your selection of the 5KSM60SPXB (the last two letters are a color code and don't matter except for painted parts), you are in the UK. There currently isn't a KSM55 model released in the UK. When they do release on in the UK, it will likely be the 5KSM55SXXB.

Checking the repair parts lists on the main page, the control board for the5KSM55SXXB would be the W11509358. The board for the 5KSM60SPXB is the W11480076. The only difference appears to be the KSM55 has a black plastic knob while the KSM60 has a silver plastic knob.