How can I handle the speed of an electric motor?

well-known motor speed in the product: question by cody : How can I control the speed of an electric motor I purchased a treadmill for pretty low-cost, but it is @ slower speeds, I worry that the controller if thier was some wiring basic controller I have two spare Strait could casue the engine is just a u button once again for the speed I was questioning how it is stuck and two two treadmills low-cost get others, I always wondered what type of electric motor accelerates anyway regulate

Tesla's Energy Motor