Analysis of a novel flux adjustable axial flux permanent magnet eddy current coupler

Abstract

Permanent magnet eddy current couplers have been widely used in large fan and pump loads to achieve the purpose of speed regulation and energy saving. In order to reduce the coupler axial volume and simplify the actuator, a novel flux adjustable axial flux permanent magnet eddy current coupler (FAAF‐PMECC) is proposed in this paper. The permanent magnet rotor is divided into three parts: the inner, middle and outer parts, where the permanent magnets are embedded in the core and the adjacent poles are magnetised in opposite directions. The middle part is the adjusting permanent magnet ring (AR), which can rotate around the shaft. The inner part and outer part are fixed permanent magnet rings (FR) that are fixed with the shaft, and the output torque can be controlled by adjusting the relative angle of AR and FR. The structure and working principle of FAAF‐PMECC are described in detail, and the output torque analytical model of the whole regulating process is established based on the magnetic equivalent circuit method. The AR regulation process is simulated by the variable reluctance model. The validation results show that the proposed structure can achieve a good speed regulation effect, and the output torque calculated by the analytical model in a certain slip speed range matches well with the output torque obtained using the 3D finite element method and experimental measurements. The sensitivity analysis of the structure parameters is also carried out. The analysis shows that the proposed coupler can achieve a wide speed range.

Multi-Objective Optimization Design of Permanent Magnet Eddy Current Coupler Based on SCG-BP Neural Network Modeling and the ONDX-NSGA-II Algorithm

“…In addition, we also calculated the efficiency of PMECC before and after optimization to comprehensively measure its performance improvement. The input power of PMECC is the output power of the prime mover, mainly divided into two parts: eddy current loss and output power [27]. The efficiency of PMECC can be calculated as follows:…”

“…Among them T is the output torque, which n represents the speed of the copper disk. P loss can be directly obtained from the previous data, and according to the subsequent calculations in Reference [27], it is known that the eddy current loss is much greater than the loss of iron; therefore, the loss of iron can be ignored.…”

Application and analysis of superconducting magnetic eddy current heater used in wind thermal power generation system

“…In particular, the magnetic eddy current wind heating method uses a wind turbine to drive the magnetic poles, which generate relative motion over the metal surface of the heat generating container and then generate eddy currents that directly heat the heat generating container. In this approach, the system has low mechanical losses and low levels of wear on the mechanical structure, making it an excellent route for wind thermogenesis [13,14].…”

Design Optimization of Permanent Magnet Eddy Current Coupler Based on an Intelligence Algorithm

“…There are three common modeling methods for PMEC. The first is to use the method of separating variables to solve partial differential equations based on Maxwell equations and boundary conditions [3][4][5][6][7][8]. The second is to build an equivalent magnetic circuit (EMC) based on the similarity between the magnetic circuit and the circuit and then solve it according to Kirchhoff's law and Ohm's law of the magnetic circuit [9][10][11][12][13].…”