He has since retired. Sidebar: The Delicate Relationship of Motor Speed and Torque This is a typical torque-speed curve for a standard AC induction motor. It's important to understand some details of ...

Prior to the advent of the adjustable-speed drive (ASD), the polyphase induction motor operated as a constant-speed motor. Figure 1 shows the well-known torque and current curves versus speed for the ...

Having built more than my fair share of forced-induction ... torque curve. It is a basic law of physics that for any given torque output, the horsepower production is a simple matter of the engine ...

Ac drives control ac-induction motors and, like their dc counterparts, control speed, torque ... many different torque curves. Let's now look at how a drive provides the frequency and voltage ...