Abstract
A novel winding type permanent magnet coupling (WTPMC) is proposed to work as an adjustable speed drive with slip power recovery function. As a kind of dual-mechanical-port electric machine with radial-flux configuration, the WTPMC consists of an outer rotor embedded with three-phase windings, an inner rotor populated with permanent magnets, and a slip power recovery circuit comprising a rectifier, a boost converter, and an ultracapacitor. The working principle of the WTPMC is presented, and its mathematical model is derived. To develop a WTPMC prototype for automotive applications, two-dimensional (2D) finite element analysis (FEA) is conducted using Ansoft Maxwell software to study the steady-state (constant slip speed) performance. For the experimental validation, the WTPMC prototype is manufactured and tested on a test bench. To show the accuracy of the 2D FEA, the computed results are compared with those obtained from experimental measurements. It is shown that the agreement between the 2D FEA and experimental results is good. Moreover, the WTPMC prototype can operate in the output speed range under different load torque conditions. The slip power recovery efficiency for the 2D FEA is 66.7%, while, for experimental measurements, it is 57.2%.
Highlights
Magnetic couplings have been widely employed in various industrial applications that require power transmission with no mechanical connection
It is shown that the agreement between the 2D finite element analysis (FEA) and experimental results is good
The winding type permanent magnet coupling (WTPMC) prototype can operate in the output speed range under different load torque conditions
Summary
Magnetic couplings have been widely employed in various industrial applications that require power transmission with no mechanical connection They can transmit torque through an air gap between two rotors that are, respectively, attached to the prime mover and the load. For permanent magnet eddy current couplings, the magnetic field is produced by permanent magnets, eliminating the electrical supply system In this case, the magnetic field can be regulated by varying the air gap length for axial-flux configuration or by adjusting the overlapping area between two rotors for radial-flux configuration. Due to the induction of eddy current in the conductive rotor, the slip power, that is the power difference between input and output terminals, is dissipated as heat and can not be recovered This will significantly decrease the coupling’s efficiency under large-slip conditions. Note that it is promising to Mathematical Problems in Engineering develop a type of magnetic coupling which can work efficiently under large-slip conditions, and one of the feasible ways is trying to recover the slip power
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