BLDC Motor and Unregulated Power Supplies

[stpx]

Hello

I have been doing some reading and some seem to build their own power supplies using full bridge rectifiers and fat capacitors.

This under load will cause a ripple/ac component without regulation.

Is it still possible to use impure DC to supply a brushless DC motor and if yes what will be the side effects compared to running the brushless motor using a pure DC supply (motor heat , noise , steady speed?)

I'm looking at 340 VDC, 3A continuous
240/240 isolation transformer -> Full Bridge Rectifier-> Caps
or 240/110 and two 170 VDC in series

[Al_The_Man]

For that supply to obtain ~5% -10% ripple which is perfectly acceptable you would not need any more than a 5000µf capacitor.
Unregulated linear supplies are very prevalent in servo/stepper supplies.
Al.

[Boltz]

Is unregulated preferred for better accommodating large transients?

-Jim Hart

[Al_The_Man]

My preference is always the linear supply, they do the job just fine and generally are more rugged than switching, even a linear regulated supply.
Switching supplies can be very difficult to repair or find original parts in many cases.
Al.

[stpx]

Thanks a lot!
I'll be doing more reading in the right direction