I am trying to find a 120vac motor that spins at 2500rpm - 3000rpm. It won't really carry much of a load.?
You can use a series or universal motor. Its speed could go up to 3600 rpm but, reduces in proportion to the load.
Your only hope to get something in the range of 2500 to 3000 RPM is to use pulleys or gears and adjust the gear ratio. You are not going to find a 60 Hz, 120 V ac motor that will spin in that speed range. The formula for the speed of a synchronous ac motor is: RPM = 120 x freq ÷ poles where: rpm = revolutions per minute freq = frequency of ac voltage poles = number of poles in the motor windings. This is an even number since you North and South poles come in pairs. In North America, the 60 Hz system will result in these motor speeds: A two pole motor will spin at 3600 RPM A four pole motor will spin at 1800 RPM A six pole motor will spin at 1200 RPM Since most motors are induction motors, slip will result in actual rpms about 5% less. If you were in Europe, the 50 Hz system would result in these motor speeds: A two pole motor will spin at 3000 RPM A four pole motor will spin at 1500 RPM A six pole motor will spin at 1000 RPM
Gear or belt down a std. 3600 rpm motor, or buy a solid state fan controller. (Lots easier).
