Recommended voltages of motors from CD/DVD driver.

Hi,
There are three motors in a CD/DVD driver.

Does anyone know the recommended voltage of each one?

One of them opens and closes the tray. I suppose it's a common dc motor.

There is also a stepper motor which drives the laser reader.

And the main CD drive motor (BLDC).

Any tips on how to discover the recommended voltages?

Thanks,
Markos