Polyphase motors: Polyphase squirrel-cage motors are basically constant-speed machines, but some degree of flexibility in operating characteristics results from modifying the rotor slot design.

What is interesting about these motor parameters is that if you change one of the three variables, the other two are affected. For example, if you increase horsepower while keeping speed constant, ...

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 ...

high speed drills to large motors that drive electric locomotives. Many are designed to run at a constant speed while others run at variable speeds over a wide range. Applications may also require ...

Within the space of two years Tesla had patented over twenty useful modifications of his new motors: to start up under heavy loads, to run at variable speed, or at constant speed, or with ...

Ac motor drives: The ac induction motor is sometimes considered a constant-speed motor, and it is when connected to a 60-Hz power source. However, its speed can be adjusted if power is supplied by ...

the latest being a CVT transmission system which uses a tilting sphere to get a variable speed output from a constant speed input. Video after the break. In [James]’ proof of concept RC vehicle ...

The new Eon 42 motor is the latest in the Eon line of energy efficient motors. The Eon 42 is a more energy efficient solution for the standard PSC motor found in many fan coils and blower deck ...

June 25], I explained that you determine motor speed by the number of poles. (Dividing the constant, 7,200, by the number of poles gives you revolutions per minute, or rpm.) When the motor is under ...

When an application operates at a constant speed, the only thing that is required may be a gearbox or speed reducer that brings the motor speed down to the required level. However, many ...

Part I of this three-part series, "Improving the Performance of Boiler Auxiliaries," explored the air preheater (APH) and important performance calculations. Part II discussed the performance ...