Suffixes with the same meaning vary from model to model. Some have submodels identified by a suffix indicating specific facilities, implemented sometimes by additional tools supplied. Older cordless models pre-dating the Dyson V6 have names in the "DC14" style. Cordless vacuum cleaners are identified by names such as "V11" or "V7" which denote the version of the appliance (the higher the model number, the greater its specification). Later upright and cylinder cleaners have labels such as "Small Ball" or "Big Ball" which relate to the machine's form factor. Most versions are identified by a name such as "DC14". Most of the current range use "2 Tier Radial cyclones", consisting of two cascaded levels of cyclonic separators to remove dirt and dust without requiring a bag or filter.
The DC17, DC22, and DC23 use the improved "Root Cyclone & Core Separator", also called "Radix Cyclone", "Intermediary Cyclone", or "Level 3 Root Cyclone Technology". The Dyson Root Cyclone technology is used in all Dyson vacuum cleaners from DC07 onward. Dyson has continued to develop its proprietary motor designs for various products, improving efficiency for increased battery life, and reducing acoustic noise, resulting in a "V8" version (for cordless vacuums) and a "V9" version (for a hair dryer), as of 2020. The first mass-produced version was named "X020" and used in the Airblade hand dryer the later DDM "V2" was used for Dyson handheld vacuum cleaners. In order to deal with the high speed and centrifugal forces, the impeller is made of carbon fibre reinforced polymer the shaft is steel. Dyson said its efficiency was 84%, which was less than the 96% efficiency that is achieved in some brushless designs.
The motor used a two-pole brushless rotor with a digital controller. These brushless motors rotate at up to 110,000 rpm.
According to Dyson, it is smaller, lighter, cleaner, and more power-efficient (due in part to tight tolerances) than conventional electric motors. The electric motor marketed as the Dyson Digital Motor (DDM) is a direct current motor, operating on the switched reluctance principle.
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