Innovative Solution of an Integrated Motor Pump Assembly

Abstract

In this paper an innovative design solution of a vane pump integrated with an electric motor is presented. In the proposed solution the double vane pump is embedded into the rotor of electric permanent magnets motor (BLDC). CFD simulations of the flow have been carried out to analyze the flow in the pump crossover areas and to avoid the cavitation phenomena at the inlet channel. Results of experimental investigations of the motor pump assembly prototype are presented.

Analysis of vane loads and motion in a hydraulic double vane pump with integrated electrical drive

“…Double vane pumps have many advantages, such as load compensation, small reaction forces in the bearings and relatively high efficiency. These pumps are also often applied due to their high durability and simple design and manufacturing [1,[5][6][7].…”

“…Figure 1 shows a cross-section of a double-acting vane pump integrated in the rotor of an electric motor [1] with permanent magnets. A BLDC motor has been used because such motors have the highest energy efficiency, the highest power value per unit mass, large durability and a very good dynamic range.…”

“…The calculation of the pressure and flow changes in the chamber between the vanes starts with the determination of the chamber volume and its changes in time [19][20][21]. To establish the pressure change in the inter-vane volume Q n the balance of the incoming and outgoing flow rates should be taken into account [1]:…”

“…The new design of the vane pump integrated with the electric motor [1] is based on the kinematic inversion and assumes that the rotor of the electric motor is the outer casing of the pump. Since the pump shaft and motor shaft are not connected, the drive torque is transmitted due to the formfit connection between the rotor of the electric motor and the pump cam ring.…”

CFD Simulation of Flow Phenomena in Selected Centrifugal Pumps, Industrial Fans and Positive Displacement Pumps

“…The innovative vane pump described in study [1] was subjected to the analysis of flow phenomena. In this solution, the pump is integrated into the BLDC permanent magnet electric motor.…”