I was wondering if there is anyway to get more wattage out of a 1000 watt motor?
The motor is only rated at 1000 watts meaning that it can be safely used for extended periods of time at its rated amount. You can push it further by increasing the power you input to it, but be prepared for it to burn up or break or something. All in all it is not recommended.
Check the rating. Often they have a "service factor" of 1.15, which would make a 1000w motor really be an 1150w motor. In addition, the rating is based on certain environmental conditions. So you may well get substantially more out than it is rated for. Bottom line though is as said above: deciding how much risk you want to carry is up to you. A 1000w motor may run just fine at 1300w, but no manufacturer or engineer will recommend or guarantee that for you.
The above is especially true if the motor is operated in a cold or well ventilated environment so that extra heat is limited. Nothing more than a fan, for example, might help.
That might help for overheating, however the electrical and mechanical parts themselves might not be able to withstand the extra power, torque, etc. In the interest of safey I'd say make sure you get a motor correctly rated for whatever job you are doing.
This figure shows a curve for a typical DC motor. Not all motors follow this curve.
Notice the maximum power. It is a product of the torque and speed of the motor, and that is what the motor can output and no more.
At stall torque, where the motor is not rotating, there would be a maximum current. You would not want to "run" your motor there for too long as it would overheat quite quickly.
The only way to increase the power of the motor, would be to increase the voltage to the windings and rotor. In which case your power supply might have to be upgraded ( unless you have a variable power supply that can handle the extra voltage and current ), which would cost probably the same if not more than a more powerful motor.
You could take your motor apart and do some re-winding of the stator and rotor, but unless you know what you are doing that is not recommended for continious safe service -experimentation possibly if that is your goal, but limit youself to small hobby motors of 6v or less.
As for an AC motor running off the mains, lets say the N.American 120v ac 60 Hz , you are stuck with 120 v ac 60 Hz. And don't try plugging a 120v motor into the 220v split because you will not have a motor for too long.
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