Hello dr depper.Yes the 30 revs is because wind turbines can be made to give high torque at low speed, the higher the number of blades on a turbine the higher the torque and the lower the speed.
I'm not sure what you are doing exactly, if you want to drive the wind gen permanently from the engine, ie not use it as a wind gen anymore then if the wind gen has a gearbox to increase the speed to the alternator/dynamo remove it and drive it direct from the engine, if the alty/dynamo rotates at the same speed as the blades then you'll need a reduction box for the engine, there are various ways to do this depending on your skill / budget, you could get hold of a cheap geared motor, remove the motor machine a pulley and use its gearbox, or use a vehicle gearbox then you'll have changing gears, or even for a beer budget repurpose some pushbike gearing parts, 5kw might be too much for bicycle stuff though.
A stepper motor is an electric motor so all you would be doing is using electricity to power a motor to drive your generator which in turn would provide less electrical power than you are putting into driving it.What I would like to do is use some sort of engine/motor for run that generator for produce 220v and 3-5 kW.
Tony talk about stepper motor,what will be the solution?
100% correct, this thread is like the blind leading the blind!A stepper motor is an electric motor so all you would be doing is using electricity to power a motor to drive your generator which in turn would provide less electrical power than you are putting into driving it.
To be honest, if you need 5 - 10 KW of 220 VAC generator power that can be driven from an engine you would be better off using a common AC generator that runs at a normal shaft speeds equal to what the engine runs at, say 1500 or 3000 RPM for 50Hz power or 1800 or 3600 RPM for 60 HZ power, not a super low RPM one.