Ronghai Qu
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View article: Research on 66 kV bus voltage optimization strategy and its stability
Research on 66 kV bus voltage optimization strategy and its stability Open
In power systems, busbar voltage is a direct reflection of power quality and directly affects the efficiency of power generation, transmission, and utilization equipment, training an acceptable voltage level is a key factor to ensure the s…
View article: A D-Axis Current Reference Compensation Method for Sensorless Control of Induction Motors Under Virtual Voltage Injection Based on Neural Networks
A D-Axis Current Reference Compensation Method for Sensorless Control of Induction Motors Under Virtual Voltage Injection Based on Neural Networks Open
Sensorless control technology for induction motors has been widely applied in various industrial scenarios due to its advantages of low cost and high reliability. However, significant instability can occur in the low-speed generation regio…
View article: An Inverter Nonlinearity Identification Method Based on Physics-Informed Network for Different Working Conditions
An Inverter Nonlinearity Identification Method Based on Physics-Informed Network for Different Working Conditions Open
The compensation of inverter nonlinearity effects (INE) can significantly mitigate current distortion, motor vibration, and losses within the motor. In industrial applications, compensation voltages derived from the INE model, as well as o…
View article: Applied Superconductivity Conference
Applied Superconductivity Conference Open
View article: Suspension Force-Coupling Analysis of Flux-Reversal Bearingless Slice Motor Based on Advanced Magnetic Field Model
Suspension Force-Coupling Analysis of Flux-Reversal Bearingless Slice Motor Based on Advanced Magnetic Field Model Open
Flux-reversal bearingless slice motor with direct suspension current (DC-FRBLM) is a novel slice bearingless motor. The robust rotor structure of the DC-FRBLM brings benefits including high compactness and ease of manufacturing. However, t…
View article: Pulsating Torque Reduction of Flux Reversal Permanent Magnet Machines with Halbach Array Magnets and a Designed Rotor Shape
Pulsating Torque Reduction of Flux Reversal Permanent Magnet Machines with Halbach Array Magnets and a Designed Rotor Shape Open
View article: IEEE Transactions on Applied Superconductivity Publication Information
IEEE Transactions on Applied Superconductivity Publication Information Open
View article: A Computationally Efficient Semi-Analytical Method for Circulating Current Loss of High Speed Permanent Magnet Machines
A Computationally Efficient Semi-Analytical Method for Circulating Current Loss of High Speed Permanent Magnet Machines Open
This article proposes a computationally efficient (CE) semi-analytical method for winding power loss calculation of high speed permanent magnet machines induced by circulating current. It combines a CE magnetostatic finite element method (…
View article: Characteristic Analysis of a New Structure Eccentric Harmonic Magnetic Gear
Characteristic Analysis of a New Structure Eccentric Harmonic Magnetic Gear Open
An eccentric harmonic magnetic gear (EHMG) is better suited for situations requiring larger transmission ratios than magnetic-field-modulated magnetic gears. In the meantime, to increase the torque density even further, a new structure for…
View article: Additively Manufactured Winding Design for Thermal Improvement of an Oil-Cooled Axial Flux Permanent Magnet Machine
Additively Manufactured Winding Design for Thermal Improvement of an Oil-Cooled Axial Flux Permanent Magnet Machine Open
This article proposes a new additively manufactured winding with integrated heat sinks to improve thermal performance of an oil-cooled yokeless and segmented armature (YASA) axial flux permanent magnet machines. The heat sinks featuring pi…
View article: Torque Capacity Improvement of Flux-Switching PM Machines Based on Directional Stator Permeance Design
Torque Capacity Improvement of Flux-Switching PM Machines Based on Directional Stator Permeance Design Open
As one type of flux modulation machines, flux-switching permanent magnet (FSPM) machines present high sensitivity to airgap structures. Therefore, both stator/rotor teeth and slot/pole combinations have significant influences on machine pe…
View article: Method and apparatus for wind turbine air gap control
Method and apparatus for wind turbine air gap control Open
Methods and apparatus for assembling a wind turbine generator are provided. The wind turbine generator includes a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis, a rotor rotatable about…
View article: Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement
Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement Open
Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors (LATMs), which are primarily used to position first-stage valves in electrohydraulic servosystems. This paper pre…
View article: Performance Investigation and Improvement of Linear Vernier Permanent Magnet Motor for Servo Application
Performance Investigation and Improvement of Linear Vernier Permanent Magnet Motor for Servo Application Open
With its high thrust density and low force ripple, the linear vernier permanent magnet motor (LVPMM) is regarded as a good competitor for linear servo applications. However, typical LVPMMs have shortcomings, such as phase imbalance, a long…
View article: BROADBAND NOISE ATTENUATION IN THE FLOW DUCT USING METAMATERIAL-BASED ACOUSTIC LINERS
BROADBAND NOISE ATTENUATION IN THE FLOW DUCT USING METAMATERIAL-BASED ACOUSTIC LINERS Open
View article: An Overview of High-efficiency Synchronous Reluctance Machines
An Overview of High-efficiency Synchronous Reluctance Machines Open
In recent years the synchronous reluctance machines (SynRMs) have received much attention. They have some good features such as high torque density, high reliability and low cost. This paper aims to give an overview of SynRMs with particul…
View article: Design Trade-Off Between Torque Density and Power Factor in Surface-Mounted PM Vernier Machines Through Closed-Form Per-Unit Equations
Design Trade-Off Between Torque Density and Power Factor in Surface-Mounted PM Vernier Machines Through Closed-Form Per-Unit Equations Open
Benefited from flux modulation effects, surface-mounted permanent magnet vernier machines (SPMVMs) present the high-torque low-speed properties, which can become the potential candidates for direct-drive applications. However, their power …
View article: Electrical machines and assemblies including a yokeless stator with modular lamination stacks
Electrical machines and assemblies including a yokeless stator with modular lamination stacks Open
An electrical machine includes a rotor with an inner rotor portion and an outer rotor portion, and a double-sided yokeless stator. The yokeless stator includes modular lamination stacks and is configured for radial magnetic flux flow. The …
View article: Dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine
Dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine Open
The present invention provides a novel dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine. The present invention improves electrical machine torque density and efficiency. At least one concentric surface-mounted permanent …
View article: Method and apparatus for assembling a permanent magnet pole assembly
Method and apparatus for assembling a permanent magnet pole assembly Open
A pole assembly for a rotor, the pole assembly includes a permanent magnet pole including at least one permanent magnet block, a plurality of laminations including a pole cap mechanically coupled to the pole, and a plurality of laminations…
View article: Permanent magnet machine with windings having strand transposition
Permanent magnet machine with windings having strand transposition Open
This document discusses, among other things, a stator with transposition between the windings or coils. The coils are free from transposition to increase the fill factor of the stator slots. The transposition at the end connections between…
View article: Method for Predicting RUL of Rolling Bearings under Different Operating Conditions Based on Transfer Learning and Few Labeled Data
Method for Predicting RUL of Rolling Bearings under Different Operating Conditions Based on Transfer Learning and Few Labeled Data Open
As industrial development increases, electric machine systems are more widely used in industrial production. Rolling bearings play a key role in machine systems and so the prevention of faults in rolling bearings is more important than eve…
View article: Optimal Pole Ratio of Spoke-type Permanent Magnet Vernier Machines for Direct-drive Applications
Optimal Pole Ratio of Spoke-type Permanent Magnet Vernier Machines for Direct-drive Applications Open
Due to magnetic gearing effects, spoke-type permanent magnet vernier machines (ST-PMVMs) have the merit of high torque density, where an extra torque amplification coefficient, i.e., pole ratio (the pole-pair ratio of PMs to armature windi…
View article: A Novel Airgap Permeance Modeling Approach for Magnetic Field Analysis of Electrical Machines Based on Electrostatic FEA
A Novel Airgap Permeance Modeling Approach for Magnetic Field Analysis of Electrical Machines Based on Electrostatic FEA Open
Detailed airgap permeance information is of great importance for analyzing the operation principle and optimizing the electromagnetic field distribution of an electric machine with unconventional topology. So far, analytical approaches upo…
View article: Convective Heat Transfer Characteristics on End-Winding of Stator Immersed Oil-Cooled Electrical Machines for Aerospace Applications
Convective Heat Transfer Characteristics on End-Winding of Stator Immersed Oil-Cooled Electrical Machines for Aerospace Applications Open
The stator immersed oil cooling has emerged as a promising thermal management method for high power density electric machines applied in aerospace applications. However, due to the complex geometry of end-winding, the research on the conve…
View article: Comparative Study of Non-Rare-Earth and Rare-Earth PM Motors for EV Applications
Comparative Study of Non-Rare-Earth and Rare-Earth PM Motors for EV Applications Open
Recently, non-rare-earth motors are attracting more and more attention due to the booming of the electric vehicle (EV) market and, more importantly, the increasing price of the rare-earth magnet material. This paper focuses on the performa…
View article: Milestones, hotspots and trends in the development of electric machines
Milestones, hotspots and trends in the development of electric machines Open
As one of the greatest inventions of human beings, the electric machine (EM) has realized the mutual conversion between electrical energy and mechanical energy, which has essentially led humanity into the age of electrification and greatly…
View article: Message from editors
Message from editors Open
In recent years, 4th Industrial Revolution and Industry 4.0 have swept the world and deeply influenced the development of global industry market. This movement arises wide attention to electric motor drive system which is playing an increa…
View article: Torque Performance Enhancement of Flux-Switching Permanent Magnet Machines With Dual Sets of Magnet Arrangements
Torque Performance Enhancement of Flux-Switching Permanent Magnet Machines With Dual Sets of Magnet Arrangements Open
Torque performance, especially torque density, is a critical performance index for the flux-switching permanent magnet (FSPM) machine that is attractive for the propulsion system. In this article, a novel FSPM machine with dual sets of mag…
View article: Design and Analysis of T-Shaped Consequent Pole Dual PM Vernier Machines With Differential Magnetic Network Method
Design and Analysis of T-Shaped Consequent Pole Dual PM Vernier Machines With Differential Magnetic Network Method Open
This article has proposed a novel design of dual permanent magnet (PM) vernier machine (DPVM) with T-shaped consequent pole (TCP) rotor. The analytical model of T-shaped magnet rotor based on differential magnetic network method is first d…