Variable-Speed Drive

variable-speed drive

[′ver·ē·ə·bəl ¦spēd ′drīv]
(mechanical engineering)
A mechanism transmitting motion from one shaft to another that allows the velocity ratio of the shafts to be varied continuously.

Variable-Speed Drive


a separate or built-in unit of a machine for the smooth alteration of the gear ratio. The drive consists of one or several infinitely variable transmissions and devices that ensure their operation. The basic characteristic of the variable-speed drive is the range of regulation—that is, a ratio of the largest gear ratio to the smallest (usually 3-6; less frequently 10-12).

Variable-speed drives provide optimal speed conditions of a machine under various operating conditions. For example, on a machine tool the best cutting speed for the various parts of a blank can be maintained when processing a rotating surface of varying radius. On subway escalators, variable-speed drives serve to closely match the speeds of the handrails and the stairs. These drives are used on machine tools, machines, and mechanisms of the textile, paper, and chemical industries, and in transportation. A widespread construction is a V-belt variable-speed drive with a built-in electric motor. The use of such drives as infinitely variable speed regulators (with programmed control when necessary) is rising significantly in connection with the possibility of using them for the automation of the control of production processes.


References in periodicals archive ?
Ltd, a subsidiary of SINOMA Group has awarded an order to ABB for a highly energy efficient variable-speed drive solution for a dual pinion ball mill in the PT Semen Bosowa Maros cement plant, which is located in Indonesia.
ABB announced it is launching an advanced control package embedded within a variable-speed drive.
It is often said that using a variable-speed drive is the best way to save energy, no matter what the application.
A variable-speed drive converter also eliminates the current spikes generated during acceleration and torque surges, ensuring less wear on the mechanical system components.
A combination of a variable-speed drive with an AC induction motor.
Each ICL unit consists of a centrifugal compressor, high-speed motor, transformer and variable-speed drive.
It's one part software; one part variable-speed drive.
Options include weigh-scale hopper or cycle count control systems, adjustable side rails, discharge chutes, hoppers, photo eyes and variable-speed drive.
has built a "swinging choke" for its ACS550 variable-speed drive to combat the harmonics that such drives produce in line-side, upstream circuits.
Virtually any part can be deburred, deflashed, burnished, polished, descaled or brightened automatically when the proper media and chemical compound are matched to the vibratory finisher, The machine features a variable-speed drive with vibration frequency from 1200-2600 cycles/min.
A manufacturer of sheet plastics has reportedly cut energy costs on a blown film extruder by up to 15 % per tonne by installing an ABB variable-speed drive and motor.
The variable-speed drive is to consist of two clutches and a drive belt:

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