Abstract
The technology of gerotor pumps is progressing towards cutting-edge applications in emerging sectors, which are more demanding for pump performance. Moreover, recent environmental standards are heading towards leakage-free and noiseless hydraulic systems. Hence, in order to respond to these demands, this study, which will be referred to as the GeroMAG concept, aims to make a leap from the standard gerotor pump technology: a sealed, compact, non-shaft-driven gerotor pump with a magnetically-driving outer rotor. The GeroMAG pump is conceived as a variable-flow pump to accomplish a standard volumetric flow rate at low rotational speed with satisfactory volumetric efficiency. By following the authors’ methodology based on a catalogue of best-practice rules, a custom trochoidal gear set is designed. Then, two main technological challenges are encountered: how to generate the rotational movement of the driving outer rotor and how to produce the guide of rotation of the gear set once there is no drive shaft. To confront them, a quiet magnet brushless motor powers the driving outer rotor through pole pieces placed in its external sideway and the rotational movement is guided by the inner edgewise pads carved on it. Subsequently, GeroMAG pump architecture, prototype, housing, methodology, materials and manufacture will be presented. As a principal conclusion, the GeroMAG proof of concept and pump prototype are feasible, which is corroborated by experimental results and performance indexes.
Highlights
Gerotor pump technology is being increasingly employed in innovative application fields, such as life science where its presence was unusual not many years ago
The rotational speed of the GeroMAG pump is controlled by means of the sensorless drive
The research presented in this paper is the technological development of a new concept of hydraulic machine: an innovative sealed, compact and non-shaft-driven gerotor pump with magnetically-driving outer rotor
Summary
Gerotor pump technology is being increasingly employed in innovative application fields, such as life science (pharmaceutical, medical and biotechnology) where its presence was unusual not many years ago. This remarkable growth is based on its three main advantages: simplicity, versatility and performance. Variable displacement pumps are widely used in hydraulic systems but they can be high-cost, high-performance, and are a very expensive unit for common consumer functions They are not suitable for much lower-cost applications, and there are new concepts of variable gerotor pumps that do not bleed off the delivered flow [1]. Hydraulic systems pumps are usually fixed-displacement units and generally incorporate a flow control valve, which bleeds off excess flow, resulting in poor performance efficiency
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