I have seen the Toms question and answers for what determines the voltage of an electric motor? None of the answers not fulfilling. I was not able to comment to get clarify my doubt, so I’m posting this same question with better explaination.

There exists 110v/60Hz motors as well 220/50Hz ac motors rating. Now what determines the voltage of an electric motor? And how can I make 60v/50Hz 2HP ac motor? And the same I want to control it using the VFD for my electric bike. I mean to say I wanted to maintain v/f ratio (1.2) to get equal torque for different RPMs. Thank you.

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    \$\begingroup\$ To make an electric motor, it is necessary to start by designing the machine mechanically and magnetically. You need to determine the total current that must flow through the conductors in each slot. Then you determine the wire size and number of turns for the desired voltage. For a do-it-yourself project, it is not possible to do that. It may be possible to obtain an appropriate motor and replace the windings to obtain the appropriate voltage. \$\endgroup\$ – Charles Cowie Jan 18 at 12:35
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    \$\begingroup\$ Simply put, a 220V motor will have twice as many winding turns as a 110V motor of the same power and configuration. \$\endgroup\$ – Dmitry Grigoryev Jan 18 at 12:40
  • \$\begingroup\$ Don’t make one, buy a motor designed for use in an electric bike - probably the most efficient option or re-purpose an existing motor of similar voltage - not as efficient but probaly more efficient than one you build. \$\endgroup\$ – Solar Mike Jan 18 at 15:55
  • \$\begingroup\$ There are people (Seemingly mostly engineers) who have demos up of the motors and generators they have built on youtube. A few designs are simpler, but suffice to say designing one that is compact and has specific parameters is quite difficult, and that is why recommendations are tending towards buying a motor, which will likely also be cheaper. Repurposing a motor is not out of the question though, so you should thoroughly examine the current motor market. Ebikes are popular, so they may be cheap already, but also check scooter/hoverboard motors and other popular motors of similar size. \$\endgroup\$ – K H Jan 20 at 0:41
  • \$\begingroup\$ If you'd really like to build one yourself (I built a small generator last year) just for fun, accepting that the performance could be anything, start by looking for suitable size motor parts you can repurpose, as you will need layered silicon steel for the windings(I salvaged the core of another motor for mine), and you also need a high degree of precision for anything you can't salvage (I had to use a metal lathe and drill press for a casing and 3d printer for the magnet holder). You may need access to a lot of tools. \$\endgroup\$ – K H Jan 20 at 0:52

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