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 ...

Various axial and centrifugal fan performance curves will be illustrated throughout this article, with no attempt made to rationalize any particular selection. The most important characteristic of a ...

There is a critical relationship in brushless servomotors between current and torque. The amount of current dictates the magnetic field strength of the motor's stator which, in turn, determines torque ...