The force which a simple motor can produce can be increased by:
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increasing the current through the armature;
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increasing the number of turns in the coils on the armature;
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increasing the magnetic field strength. In a motor where the magnetic field strength is provided by electromagnets, the magnetic field strength can be changed quite easily.
This is a common problem with two pole motors, which have a single coil of wire.
Often a two pole motor needs a spin to get it going. Most toy motors have three poles. Therefore they can start whatever position the poles are. Larger motors have many more.
Electric motors can be made more efficient by having more poles, and circular magnets, which means that the magnetic field remains at 90 degrees all the time.
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