What effect does increasing the amps or the voltage have on an electric motor?

I'm afraid it's not quite that simple. An AC or DC motor? Alternating-current electric motors run at speeds closely determined by the number of poles in the motor and the frequency of the alternating current supply.

AC motors can be made with several sets of poles, which can be chosen to give one of several different speeds (say, 720/1800 RPM for a 60 Hz motor). The number of different speeds available is limited by the expense of providing multiple sets of windings. If many different speeds or continuously variable speeds are required, other methods are required.

Direct-current motors allow for changes of speed by adjusting the shunt field current. Another way of changing speed of a direct current motor is to change the voltage applied to the armature. Torque is determined mostly by design.

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