Abstract
This paper presents the modular topologies of the dual-stator dual-winding permanent magnet (PM) linear motors for linear compressors used in the electrified transportation application. Compared to the conventional PM linear motor in compressor, the proposed modular model is designed with the same volume but a higher thrust force density and a further higher air pressure in air cylinder, which are competitive in the compressor industry. The proposed compact PM linear motors are constructed with tubular windings in both inner and outer stators, as well as the ring-type magnet in mover. Simulation results of motor characteristics are compared by three-dimensional finite element method (3D FEM). Finally, the prototypes of the proposed PM linear motors are manufactured and tested for the linear compressor application.
Highlights
In the application of electrified transportation, a rotary motor system generally has relative low efficiency and additional mechanical friction
In order to effectively eliminate the extra energy waste and save volume caused by the crank mechanism in the rotary motor system, the linear compressor motor is widely adopted due to its no crank mechanism, which can be directly oscillated by the inside drive motor and the helical coil springs [1,2,3]
Unipolar magnet can be made as the ring-type, with the half height design compared to the outer-stator tooth. Both of two stator cores are laminated based on the path of the magnetic flux, where outer stator cores are divided into eight segments for easy manufacture and inner stator core is listed in the circumferential pattern for less eddy current loss
Summary
In the application of electrified transportation, a rotary motor system generally has relative low efficiency and additional mechanical friction. As the relative high-performance linear motor, numerous PM linear motors have been developed for the linear compressor application, mainly aiming to improve the thrust force density, power, as well as efficiency [4,5,6,7,8,9]. Unipolar magnet can be made as the ring-type, with the half height design compared to the outer-stator tooth Both of two stator cores are laminated based on the path of the magnetic flux, where outer stator cores are divided into eight segments for easy manufacture and inner stator core is listed in the circumferential pattern for less eddy current loss. Two groups of stator tubular windings in both inner and outer stators are proposed, aiming to improve the motor thrust force density and air cylinder pressure with limited compressor installation space. The prototypes of the proposed motors are constructed and performance is experimentally validated for application on the electrified transportation linear compressor
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