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  2. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    Modern automobile engines are typically operated around 2000 rpm – 3000 rpm (33 Hz – 50 Hz) when cruising, with a minimum (idle) speed around 750 rpm – 900 rpm (12.5 Hz – 15 Hz), and an upper limit anywhere from 4500 rpm to up to 10 000 rpm (75 Hz – 166 Hz) for a road car, very rarely reaching up to 12 000 rpm for certain cars (such ...

  3. Rotational frequency - Wikipedia

    en.wikipedia.org/wiki/Rotational_frequency

    Rotational frequency, also known as rotational speed or rate of rotation (symbols ν, lowercase Greek nu, and also n), is the frequency of rotation of an object around an axis. Its SI unit is the reciprocal seconds (s −1 ); other common units of measurement include the hertz (Hz), cycles per second (cps), and revolutions per minute (rpm).

  4. Torque converter - Wikipedia

    en.wikipedia.org/wiki/Torque_converter

    As with a basic fluid coupling the theoretical torque capacity of a converter is proportional to , where is the mass density of the fluid (kg/m 3), is the impeller speed , and is the diameter . [3]

  5. Specific speed - Wikipedia

    en.wikipedia.org/wiki/Specific_speed

    Specific speed N s, is used to characterize turbomachinery speed. [1] Common commercial and industrial practices use dimensioned versions which are of equal utility. Specific speed is most commonly used in pump applications to define the suction specific speed —a quasi non-dimensional number that categorizes pump impellers as to their type and proportions.

  6. Motor constants - Wikipedia

    en.wikipedia.org/wiki/Motor_constants

    The rating of a brushless motor is the ratio of the motor's unloaded rotational speed (measured in RPM) to the peak (not RMS) voltage on the wires connected to the coils (the back EMF). For example, an unloaded motor of K v {\displaystyle K_{\text{v}}} = 5,700 rpm/V supplied with 11.1 V will run at a nominal speed of 63,270 rpm (= 5,700 rpm/V ...

  7. Torque - Wikipedia

    en.wikipedia.org/wiki/Torque

    A conversion factor may be necessary when using different units of power or torque. ... where rotational speed is in revolutions per minute (rpm, rev/min).

  8. Centrifugal clutch - Wikipedia

    en.wikipedia.org/wiki/Centrifugal_clutch

    This works on the principle of centrifugal force, which means when engine speed reaches a specific rpm (Revolutions per minute) it generates enough centrifugal force inside the clutch which results in clutch engagement, and it transmits the engine power. At lower speeds, it disconnects itself to stop power transmission.

  9. Motor drive - Wikipedia

    en.wikipedia.org/wiki/Motor_drive

    A variable speed motor drive is a system that includes a ... these would be 1800 RPM and 900 RPM. If speed changes are rare, the motor may be initially connected for ...