Caiyong Ye

Novel Single-Phase Doubly Salient Permanent Magnet Machine With Asymmetric Stator Poles

One novel 4/6 stator/rotor single-phase doubly salient permanent magnet machine with asymmetric stator poles is proposed in this paper. The stator poles of proposed machine are distributed non-uniformly along the circumference of the stator yoke. First, it investigates the new topology and working principle in detail. Then, the presented structure is optimized based on 2-D finite element analysis. Finally, full comparison of electromagnetic performance indexes of the new machine with those of the traditional one is also presented. It indicates that the novel structure has a much higher torque density, lower cost of permanent magnet, and a much better starting capability than those of the traditional one under the constant volume and electrical load.

Optimization for 4/4 stator/rotor single-phase asymmetric-stator-poles doubly salient permanent magnet machine

One novel 4/4 stator/rotor single phase doubly salient permanent magnet machine (SP-DSPMM) with asymmetric stator poles is proposed in this paper. The stator poles for the proposed machine are distributed non-uniformly along the circumference of the stator yoke. Firstly, it investigates the new topology and operation principle based on diagram description and mathematical derivation. Then, several improved structures are presented to improve the output torque performance. Finally, comprehensive comparison on main electromagnetic performance indexes for all the proposed structures are performed. It indicates that the torque ripple and minimum torque under rated operation condition can be improved with pole shoe, step air gap and auxiliary teeth introduced in the original structure.

Model predictive control for linear induction machines with less computational burden

The model predictive current control (MPCC) strategy considers all participating voltage vectors to select the optimal voltage vector, which needs comparatively longer computational time to make future current mostly approaching to its reference. In order to decrease time consumption burden, the mathematic model of linear induction machines (LIM) is built up in αβ coordinate instead of dq coordinate so as to avoid the complex coordinate transformation. And, the predictive current model of LIM is analyzed in detail to get the principle of selecting optimal voltage vector instead of complicate calculation.

Optimal flux trajectory analysis of linear induction machine considering thrust transient

The efficiency optimization control (EOC) in steady state optimizes the flux to improve the efficiency of linear induction machine (LIM). However, it is inefficient in dynamic operations, in which the aforementioned flux solution no longer satisfies the change of thrust, thus the efficiency is deteriorated. In this paper, LIM losses including both copper and core losses during thrust transient are analyzed, and a dynamic loss model of LIM is established. A numerical solution to estimate the optimal flux trajectory is derived, and a practical method based on experimental prototype is put forward to minimize the losses as well as to meet the desired thrust response.

Fast global terminal sliding mode control method for torque regulation on disc coreless permanent magnet synchronous motor

The disc coreless permanent magnet synchronous motor (DCPMSM) is drived by an inverter with current source chopper. A fast global terminal sliding mode control (FGTSMC) method is proposed in this paper for the torque loop, and the instantaneous torque is predicted. The proposed control system can dramatically reduce the current ripple of the DCPMSM by low inductance. The feasibility of this proposed control method is confirmed by simulation and experimental results.

Novel single phase doubly salient permanent magnet machine with asymmetric stator poles

One novel 4/6 stator/rotor single phase doubly salient permanent magnet machine with asymmetric stator poles is proposed in this paper. Design optimization technique based on 2D finite element analysis (FEA) is used to refine the proposed machine. Besides, comparison of electromagnetic performance indexes of the proposed machine with that of traditional 4/6 stator/rotor single phase doubly salient permanent magnet machine with uniformly distributed stator poles is also presented. It indicates that the proposed machine has much higher torque, lower core losses, and higher efficiency than those of traditional one.

In-wheel outer rotor flux switching permanent magnet machine with fractional-slot concentrated windings for electrical vehicles

In this paper, a 15kW novel out rotor flux switching permanent magnet machine (OR-FSPM) with 48/56 stator/rotor configuration (OR-FSPM) is proposed for in-wheel electrical vehicle. The OR-FSPM machine with fractional-slot concentrated windings (FSCWs) has become good candidates for in-wheel motors due to their robust rotor structure, high torque and power capability. What is more, the out rotor configuration of the machine can provide the convenient for in-wheel direct drive. Comprehensive simulations based finite element analysis (FEA) are studied on the overall electromagnetic property of this machine, especially the output capability.

Composite field-oriented control for linear induction motor based super-twisting sliding mode observers

A composite sliding mode field-oriented control (FOC) for linear induction motors (LIM) is developed in this paper. A new sliding-mode observer-controller scheme is designed to provide a line speed tracking, in which the observer can estimate the load thrust and feed back to controller for small switching gain of sliding mode controller. The control scheme also incorporates super-twisting sliding mode observers of current and rotor flux, so as to improve the LIM control performance. Simulated and experimental results show that this scheme can provide fast dynamic characteristics and strong robustness.