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Constant speed drive information


Constant speed drive for Boeing 727, made by Sundstrand Corporation

A constant speed drive (CSD) also known as a constant speed generator, is a type of transmission that takes an input shaft rotating at a wide range of speeds, delivering this power to an output shaft that rotates at a constant speed, despite the varying input. They are used to drive mechanisms, typically electrical generators, that require a constant input speed.

The term is most commonly applied to hydraulic transmissions found in the accessory drives of gas turbine engines, such as aircraft jet engines. On modern aircraft, the CSD is often combined with a generator into a single unit known as an integrated drive generator (IDG).

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Constant speed drive

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A constant speed drive (CSD) also known as a constant speed generator, is a type of transmission that takes an input shaft rotating at a wide range of...

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Accessory drive

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also a speed-sensitive governor Generators, often one for engine systems and one for the aircraft Constant Speed Drive to maintain a constant frequency...

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Motor drive

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drive means a system that includes a motor. An adjustable speed motor drive means a system that includes a motor that has multiple operating speeds....

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Continuously variable transmission

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available executions of eBike CVTs include ratioX and e2 Drives. Constant speed drive Friction drive List of automobiles with continuously variable transmissions...

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Floppy disk

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3½-inch drives (notably the Macintosh External 400K and 800K drives) instead use Constant Linear Velocity (CLV), which uses a variable speed drive motor...

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Optical storage media writing and reading speed

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writing/reading speeds. Original CD-ROM drives could read data at about 150 kB/s, 1× constant angular velocity (CAV), the same speed of compact disc players...

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Afterburner

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Scaled Composites. Concorde flew long distances at supersonic speeds. Sustained high speeds would be impossible with the high fuel consumption of afterburner...

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Constant angular velocity

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a floppy or hard disk drive, or gramophone, which operates in CAV mode. In CAV mode, the spindle motor turns at a constant speed, which makes the medium...

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Turbojet

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extracted to drive the compressor. The turbine exit gases still contain considerable energy that is converted in the propelling nozzle to a high speed jet. The...

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Turboshaft

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the shaft output. The gas generator creates the hot expanding gases to drive the power section. Depending on the design, the engine accessories may be...

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Constant linear velocity

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storage, constant linear velocity (CLV) is a qualifier for the rated speed of an optical disc drive, and may also be applied to the writing speed of recordable...

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Compressor stall

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The stall cells rotate with the rotor blades, but at 50 to 70% of their speed, affecting subsequent airfoils around the rotor as each encounters the stall...

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Flameout

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(starter-assisted restart) in order for the compressor to achieve sufficient rotational speed for successful ignition. For example, the Airbus A320 passenger jet has...

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Turboprop

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the propeller control lever. The constant-speed propeller is distinguished from the reciprocating engine constant-speed propeller by the control system...

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Blade pitch

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the final drive of a car. Low pitch yields good low speed acceleration (and climb rate in an aircraft) while high pitch optimizes high speed performance...

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Ramjet

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provide air for combustion. Ramjets work most efficiently at supersonic speeds around Mach 3 (2,300 mph; 3,700 km/h) and can operate up to Mach 6 (4,600 mph;...

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Autothrottle

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version was able to keep constant angle of attack but speed only during approach. When the possibility of maintaining of speed during entire flight was...

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Advanced technology engine

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One version has three drive shafts instead of the usual one. This allows the three sets of blades to revolve at different speeds. An intermediate design...

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Pulsejet

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model aircraft. The speed record for control-line pulsejet-powered model aircraft is greater than 200 miles per hour (322 km/h). The speed of a free-flying...

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Coffman engine starter

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in contrast with other type of cartridge starter which acted directly to drive the engine piston down and so turn the rest of the engine over, such as...

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Rotating detonation engine

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applications. In detonative combustion, the flame front expands at supersonic speed. It is theoretically more efficient than conventional deflagrative combustion...

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Centrifugal compressor

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are at constant shaft speed or with a constant throttle setting. If the speed is held constant, test points are taken along a constant speed line by...

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Auxiliary power unit

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started manually by pulling a cable). After the Riedel unit has reached a speed of about 300 rpm, it automatically engages the compressor shaft of the turbojet...

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