In this paper, the thermal analysis of a hybrid excitation Linear eddy current brake is presented. The air gap flux of the hybrid excitation linear eddy current brake is provided by the excitation windings and the permanent magnets. Therefore, the braking force produced by the eddy current brake is large and controllable. But on the other hand there is a high heating value in the excitation windings and conductor plate, hence, it is necessary to analyze thermal characteristics of the eddy current brake to avoid the declination of braking performance or even damage of device. Firstly, the working principle of the eddy current brake is described, then, the thermal network model of the eddy current brake is built taking the actual air flow around the eddy current brake into consideration. Finally, the validity of the thermal network model is verified by steady and dynamic thermal experimental measurements, respectively.

Transverse flux machines (TFMs) can achieve high force density by the reducing the pole pitch because of the decoupling of electric and magnetic loadings. But the main flux linkage interlinking with the armature coils will decrease as the pole pitch reducing, resulting in motor performance degradation. Unlike the approaches adopted by many literatures to suppress the leakage flux, this paper proposes a novel dual-consequent-pole transverse flux linear machine by adopting dual-PM structure. Without increasing the occupied volume, the coil flux linkage is enhanced and the force density can be further improved. At first, the basic configuration and operation principle are introduced at first. Then the leading parameter influence on the force density are investigated. The electromagnetic performance of the proposed machine is investigated by three-dimensional finite element analysis and is compared with its counterparts. The field distribution, winding flux linkage, back EMF, detent force and thrust force are emphasized as well as the efficiency and power factor. Finally, a prototype machine is constructed and tested to validate the theoretical analysis.

Due to the enhanced air gap flux density and eddy currents in the favorable path, eddy current brakes with slotted conductors have attracted more attention in recent years. However, due to the increased difficulty in analytical modeling, there is currently no suitable analytical model available for the optimization design of eddy current brakes with slotted conductor. To solve this problem, an improved analytical model is provided based on the subdomain model and the least squares method in this article. The proposed analytical model considers slotted conductor disk, magnetic saturation of primary core and actual path of eddy currents in the conductor disk. The accuracy of the proposed analytical model is verified by finite-element method (FEM) and experimental measurement. The results show that the improved analytical model has good accuracy in the entire speed range. As the analytical model takes less computational time than three-dimensional FEM, it can be used as an effective tool for the optimization design.

The reverse-salient permanent magnet synchronous motors (RSPMSMs) have attracted considerable attention in electric vehicles due to their wide constant-power speed range. However, the dq -axis current distribution laws of the RSPMSM are absent, and the relationships between motor parameters and the constant-power speed range are still unclear. First, the flux-intensifying effects and dq -axis current distribution laws of the RSPMSM are investigated. Second, the relationships between motor parameters and the constant-power speed range are summarized. Then, an RSPMSM with a wide constant-power speed range is proposed. The electromagnetic performance of the proposed RSPMSM is investigated by finite element method simulations and is compared with a conventional interior permanent magnet synchronous motor. Finally, an RSPMSM prototype is manufactured and tested. The results show that the RSPMSM exhibits favorable characteristics such as a wide constant-power speed range, weak flux-weakening current, high permanent magnet operating point, strong short-circuit current suppression capability, and high efficiency at a high speed. The constant-power speed range tested by the experiment reaches 5.5:1. Thus, the dq -axis current distribution laws, the relationships between motor parameters and the constant-power speed range are of great significance to the design of the RSPMSM.

In this paper, a novel dual-consequent-pole transverse flux motor and its analytical model are proposed. Differ from existed transverse flux machines, the proposed motor owns core-tooth-to-magnet types of consequent-pole configuration on both stator and rotor. This unique motor configuration improves the no-load permanent magnet flux linkage interlinking with armature winding, thus leading to an enhanced torque density. The structure and working principle of the proposed motor are introduced as the first half part. Then, based on the combination of equivalent magnetic circuit method and subdomain method, an analytical modeling method is proposed to estimate the electromagnetic performance of the proposed motor. The parameters of the equivalent magnetic circuit model, e.g., the magnetomotive forces and reluctances are calculated based on subdomain model technique, considering the influence of the cores' saturation and the axial end effect during calculation. Based on the magnetic field distribution result, the electromagnetic performance is estimated. The analytical results are verified by both finite element method and prototype experiment.

A novel cage-secondary permanent magnet (PM) linear eddy current brake (ECB) with wide speed range and its analytical model are presented in this article. Differ from the existed PM ECB, the proposed ECB owns the variable parameters cage-secondary structure. This unique secondary structure can keep braking force at a large constant value from high speed to low speed by changing the secondary parameters in different speed ranges. First, both the structure and working principle of the proposed ECB are given. Then, a new analytical model combined with multilayer theory is proposed, where the saturation of secondary iron teeth and the end effect are considered. Based on the magnetic field distribution result, the characteristics of proposed ECB are analyzed. Third, the accuracy and validity of the analysis results are verified by the finite-element method and prototype experiments. Moreover, based on the genetic algorithm, the optimal secondary parameters are obtained with the objective of maximum braking force at each speed.