An oscillator is capable to oscillate an output about a mean with certain predetermined frequency. The AC being a periodically oscillating can thus be generated using an oscillator with fixing the amplitude of the signal preferably using a multiplier (with a steady value) or an amplifier. This feature is typically helpful for eg. in control systems in drives.
There are of course other ways to produce AC from DC quantities too.
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A generator is used to convert mechanical energy to electrical energy. An oscillator is used to convert dc to ac
I would assume that you mean what devices do you use to convert ac current to dc current?The answer is Diodes.seediode-bridge
The easiest way would be to convert the AC power to DC by using a rectifier diode and a filter capacitor. In that way you can now run your DC motor on DC.
rectifier circuit convert ac to dc signal
first it converts ac to dc as rectifier But the required dc voltage is obtained by taking average of on & off DC input voltage.