Abstract
Linear positive displacement machines are becoming increasingly more attractive for applications that are normally known as unconquerable niches of rotary and scroll machines. Free-piston machines are characterized by the absence of a crank mechanism, since there is a direct transformation of electrical energy into the piston movement. From the point of view of manufacturing, these machines benefit from a higher robustness and reliability because of less mechanical components involved and reduced frictional losses associate with a conventional crank mechanism.However, the major challenge in replacing the rotary machines by linear ones is a lower efficiency at lower speeds which is unavoidable because of the nature of linear motion: continuous operation means a reciprocating movement within a stroke length with significantly long periods of acceleration and deceleration when the speed is far from its optimal value. However, the advantage of free-piston machines is the fact that the motion profile is freely configurable within physical constraints, which provides a possibility to optimize the speed given the efficiency map of particular linear motor.While the methods and results of the efficiency assessment for rotary machines are widely available, there is a lack of these analyses for linear machines. The current study provides in-depth analyses of a double-coil iron core linear motor also acting as a generator.
Highlights
Linear drive systems are widely used in industry, for instance, in various pick-and-place applications, computer numerical control (CNC) machines among others
Free-piston machines are characterized by the absence of a crank mechanism, since there is a direct transformation of electrical energy into the piston movement
The current study provides in-depth analyses of a double-coil iron core linear motor acting as a generator
Summary
Linear drive systems are widely used in industry, for instance, in various pick-and-place applications, computer numerical control (CNC) machines among others. Where a linear motion is involved, such machines and actuators provide the possibility of direct transformation of electrical energy into the required motion profile. If a rotating machine is used, the rotation needs to be transformed into translation by means of diverse transmissions such as crank, screw, swash plate, rack, and pinion mechanisms. Mechanical losses, associated with the transmission, affect the overall efficiency of the system. If a linear motor is implemented, an improvement of around 5.5 % can be obtained, as reported by [1].
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