The phrase "a variable speed motor" is correct and usable in written English.
You can use it when referring to a motor that can operate at different speeds, often in technical or engineering contexts.
Example: "The new design incorporates a variable speed motor to enhance efficiency and performance in various applications."
Alternatives: "adjustable speed motor" or "multi-speed motor".
It found that it could not produce a variable speed motor in their washing machine prototypes because their technology and design were insufficiently advanced.
The mill consisted of a 300 mL horizontal, cylindrical disruption chamber with a central agitator driven by a variable speed motor.
Chuck a small bit into a variable speed motor drill.
The frequency of the spark is then controlled by rotating electrodes mounted on a variable speed motor.
Power-assisted liposuction (PAL) is a commonly used technology that uses a variable-speed motor to provide reciprocating motion to the cannula, which in combination with the reciprocating action of the surgeon's arm, facilitates removal of adipose tissue [ 3].
Dexmedetomidine (40 μg/mL; Tocris, Bristol, UK) or propofol (10 mg/mL; Fresenius Kabi, Runcorn, UK) was delivered intraperitoneally (i.p ., and animals were placed in a custom-built apparatus consisting of a continuously rotating transparent cylinder driven by a variable-speed motor.
The treadmill was attached to a 4-meter cable controlled by a relatively quiet variable speed motor, which was placed in an adjacent room.
Such diversification requires the use of power control units essentially for power control, power conversion and power conditioning applications such as variable speed motor drives (dc ac conversion), dc dc converters and other similar devices.
The impeller was driven by a variable speed DC motor assembly (Parr Instruments).
Positive displacement pumps are frequently used for abrasive slurry pumping, and senior design engineer Jim Handzel further reminds us how the use of variable speed motors — correctly specified — can enhance their efficiency.
Substrate rotation is achieved by means of a variable speed DC gear motor used to rotate the substrate shaft.
