- Pump (type 1) mounted outside the oil sump and fitted with a three-phase EC motor and normally with a gerotor.
- An oil pan-installed pump (type 2), also fitted with a three-phase EC motor and submerged below oil level.
- A radial pump (type 3), driven by a single-phase EC motor, also mounted outside of the oil sump.
A relevant feature of type 1 is its installation flexibility. The model is designed as a plug-in unit and can be mounted, with no or only slight modifications, on a variety of powertrains, thus addressing widely different customer applications. Indeed type 1, scaled in different outputs, is the preferred solution for the cooling of e-motors.
Type 2 pumps, in contrast, are virtually custom-tailored due to the different oil pans used on the various kinds of vehicles.
Type 3 pump keeps the transmission oil level low and thus reduces splashing losses caused by the gearwheels. Since pump pressure is low in such instances, a centrifugal pump is most effective in terms of costs, weight, and noise emissions.
An electrically driven oil pump has three subsystems: pump, motor, and electronic controller. Whenever a new pump is developed, attention is paid to the integration of these modules with a view to arriving at a further reduction of footprint, weight, and component count. Since Pierburg has years of experience in these respects and for some time now has been a specialist in electrically driven coolant pumps, such development targets as the durability of the electronics under extreme ambient conditions and vibration profiles have been achieved.
Advanced communication and diagnosis functions have been further developed and adopted from the coolant pump family for synergy effects with the result that customers nowadays benefit from bidirectional communication between pump and controller. Meriting particular mention are the improvements regarding noise emissions on this type of pump which are attained by fine-tuning commutation and lowering pressure pulsation through hydraulic design optimisations.