Variable Speed

Some articles on variable speed, variable, speed, speeds:

AC Motor - Wound Rotors
... An alternate design, called the wound rotor, is used when variable speed is required ... connect the slip rings to an external controller such as a variable resistor that allows changing the motor's slip rate ... In certain high-power variable speed wound-rotor drives, the slip-frequency energy is captured, rectified and returned to the power supply through an inverter ...
Tip Speed Ratio - Cp - λ Curves - The Case For Variable Speed Wind Turbines
... Originally, wind turbines were fixed speed ... This has the benefit that the rotor speed in the generator is constant, thus the frequency of the AC Voltage is fixed ... the figure above, we can see that the power co-efficient is a function of the tip-speed ratio ...
Combine Harvester - Maintaining Threshing Speed
... Another technology that is sometimes used on combines is a continuously variable transmission ... This allows the ground speed of the machine to be varied while maintaining a constant engine and threshing speed ... It is desirable to keep the threshing speed constant since the machine will typically have been adjusted to operate best at a certain speed ...
Adjustable-speed Drive
... Adjustable speed drive (ASD) or variable-speed drive (VSD) describes equipment used to control the speed of machinery ... Many industrial processes such as assembly lines must operate at different speeds for different products ... conditions demand adjustment of flow from a pump or fan, varying the speed of the drive may save energy compared with other techniques for flow control ...

Famous quotes containing the words speed and/or variable:

    “It was undoubtedly the feeling of exile—that sensation of a void within which never left us, that irrational longing to hark back to the past or else to speed up the march of time, and those keen shafts of memory that stung like fire.”
    —Albert Camus (1913–1960)

    “Walked forth to ease my pain
    Along the shore of silver streaming Thames,
    Whose rutty bank, the which his river hems,
    Was painted all with variable flowers,”
    —Edmund Spenser (1552?–1599)