PM Motor Research Articles

Unified Analytical Modeling of Armature Magnetic Field of Slotless PM Motor With Equidirectional Toroidal Winding

Unified Analytical Modeling of Armature Magnetic Field of Slotless PM Motor With Equidirectional Toroidal Winding

Design Optimization of Spoke-Type Flux-Intensifying PM Motor With Asymmetric Rotor Configuration for Improved Performance

Design Optimization of Spoke-Type Flux-Intensifying PM Motor With Asymmetric Rotor Configuration for Improved Performance

AC Copper Loss Evaluation Method for High-Speed PM Motors with Rectangular Coils

AC Copper Loss Evaluation Method for High-Speed PM Motors with Rectangular Coils

Research on Stator Loss Suppression of a Dual-Rotor Flux-Modulated PM Motor Based on Harmonic Directional Reduction

Research on Stator Loss Suppression of a Dual-Rotor Flux-Modulated PM Motor Based on Harmonic Directional Reduction

Research on Power Factor Improvement of a Variable-Leakage-Flux PM Motor Based on Regulated-Flux-Barrier Topology

Research on Power Factor Improvement of a Variable-Leakage-Flux PM Motor Based on Regulated-Flux-Barrier Topology

Research on Characteristic Airgap Harmonics of a Double-Rotor Flux-Modulated PM Motor Based on Harmonic Dimensionality Reduction

Research on Characteristic Airgap Harmonics of a Double-Rotor Flux-Modulated PM Motor Based on Harmonic Dimensionality Reduction

Low Vibration Research and Design of in-Wheel V-Shaped PM Motor From the Perspective of Winding Magnetomotive Force

Low Vibration Research and Design of in-Wheel V-Shaped PM Motor From the Perspective of Winding Magnetomotive Force

Study on the Slotless PM Motor Design Process Considering High Speed

Study on the Slotless PM Motor Design Process Considering High Speed

Vibration Performance Analysis of a Yokeless Stator Axial Flux PM Motor with Distributed Winding for Electric Vehicle Application

This article presents a detailed analysis of the electromagnetic force and vibration behavior of a new axial flux permanent magnet (AFPM) machine with a yokeless stator and interior PM rotor. Firstly, the configuration of an AFPM machine with a dual rotor and a sandwiched stator is introduced, including the structural design, fixation of the yokeless stator and segmented skew rotor structure. Then, the influence of anisotropic material and a fixed structure on stator modes is analyzed, including elastic modulus, shear model, the skew angle of slot and the thickness of stator yoke. Furthermore, a new non-equally segmented skew rotor structure is proposed and calculated for the reduction in vibration based on the multiphysics model. Three different segmented skew rotor schemes are compared to illustrate the influence of reducing vibration and noise. The predicted results show that the effect of the non-equally segmented skew rotor on reducing vibration is better than the other two schemes. Finally, a 120 kW AFPM motor is experimented with and the result matches well with the predicted data. The vibration performance of the AFPM motor with a dual rotor and sandwiched yokeless stator is revealed comprehensively.

Analysis and Research on Local Irreversible Demagnetization of Inverter-Powered PM Motor

Analysis and Research on Local Irreversible Demagnetization of Inverter-Powered PM Motor

Simultaneous Suppression of Torque Pulsation and Electromagnetic Vibration of a Spoke-Type PM Motor by Space-Time Flux Density Harmonics Optimization

Simultaneous Suppression of Torque Pulsation and Electromagnetic Vibration of a Spoke-Type PM Motor by Space-Time Flux Density Harmonics Optimization

A Review on Poles Demagnetization in Permanent Magnet Motors

Permanent magnet motors like BLDC and PMSM are widely used in industry and electric vehicles. Demagnetization of permanent poles in motors is the biggest problem. To design a machine that has good efficiency and no demagnetization problems, real-time fault diagnosis is necessary. Various causes of demagnetization, detection, and measuring methods are discussed by researchers analyzed in this paper. Apart from the comparison of different methods of fault detection, a general comparison among the different methods of various strategies has been made based on the torque ripple, analysis of harmonics, current waveform, back e.m.f. waveform and losses of the PM motor. Finite Element Analysis (FEA) and analytical method adopted by some researchers to get the results. Moreover, considering the importance of BLDC in the electric vehicles (EVs) industry, the selection of the best method to detect demagnetization has been discussed.

Correction to A super‐high‐speed PM motor drive for centrifugal air compressor used in fuel cell unmanned aerial vehicle

Correction to A super‐high‐speed PM motor drive for centrifugal air compressor used in fuel cell unmanned aerial vehicle

RASP methods for achieving low torque pulsation in spoke-type PM motors

RASP methods for achieving low torque pulsation in spoke-type PM motors

Cooling System Analysis of an Enclosed Yokeless Stator for High-Power Axial Flux PM Motor With Distributed Winding

Cooling System Analysis of an Enclosed Yokeless Stator for High-Power Axial Flux PM Motor With Distributed Winding

A high efficient 33 level inverter for electric vehicle application using PMSM

The permanent magnet synchronous motor (PMSM) avoids commutation-related torque ripples and produces smooth torque. Its great handling capacity and better efficiency make it an excellent choice for high-demand applications. A typical PM motor drive fed with pulse width-modulated voltages may cause the motor insulation to break down if rapid voltages (dv/dt) occur across the motor terminals. Applying variable voltage with low dv/dt and implementing multiple inverter topology can solve this issue. Multilevel converters have minimal switching losses, better power quality and the ability to operate at both fundamental and higher switching frequencies. In this study, a three phase stacked multilevel inverter-based FOC driven PMSM drive design is proposed. Here, the neutral point is a capacitor intermediate point on DC side, where current is naturally balanced throughout a switching cycle. This makes it possible to use downstream batteries and even lower voltage equipment, greatly increasing efficiency, improved performance and smother control at low speed. Therefore, direct-battery-driven electric vehicles will be able to use this. A 33 level inverter-based PMSM drive was used to implement the FOC, and the simulation results were used to validate it. The Matlab/Simulink tool is used to simulate the entire system.

Harmonic-Oriented Design and Vibration Characteristic Suppression for Interior Permanent Magnet Motors

In this article, a radial-electromagnetic-force-harmonic-oriented design methodology is proposed to suppress motor vibration. In the proposed methodology, the radial electromagnetic force harmonics innovatively act as the effective bridge between structural field and vibration performance. And avoiding low-order and large-amplitude radial electromagnetic force harmonics is the premise of designing low-vibration PM motors. For extensive investigation, a 36-slot/8-pole IPM motor with different winding configurations and variable rotor parameters is chosen as a design example. Then, vibration suppression methods of lowest-nonzero-spatial-order-shifting in the stator system and dominant-harmonic-amplitude-reduction in the rotor system are proposed. Next, the performances of the IPM motor are simulated for validating the proposed methodology. Finally, a prototype motor is fabricated and experimented. Both theoretical derivation and test results are presented to verify the validity of the motor and the proposed design methodology.

Improved Matlab/Simulink model of dual three-phase fractional slot and concentrated winding PM motor for EV applied brushless DC drive

Improved Matlab/Simulink model of dual three-phase fractional slot and concentrated winding PM motor for EV applied brushless DC drive

Design and analysis of a hybrid permanent magnet variable leakage flux motor for low core loss and wide speed range

In this paper, a new hybrid permanent magnet variable leakage flux (VLF-HPM) motor is proposed. In order to enhance motor speed range, short arc-shaped and elliptical-shaped magnetic barriers are placed on the q-axis magnet circuit, realizing the so-called leakage flux effect. In addition, ferrite PMs are artfully designed, so self-leakage flux can be reduced while main flux is enhanced. The relationship among PM topology, flux barrier and flux-regulation capability are also investigated in detail. Finally, the electromagnetic performance of VLF-HPM motor is evaluated by the finite element analysis and compared with a conventional V-typed PM motor. It is noted that, compared with conventional V-typed PM motor, the VLF-HPM motor possesses lower core losses and a wider speed range, which offers a new research path for high-performance PM motor.

D-Q-axis magnetic field design and investigation of asymmetrical multi-layer flux barriers PM motor for speed regulation enhancement

In this paper, an asymmetrical multi-layer flux barriers permanent magnet (AMFB-PM) motor is proposed. The key of this study is to design the d-q-axis magnetic field reasonably. Firstly, the influence of d-axis inductance on the constant power speed range is analyzed. To optimize the constant power speed regulation performance, an asymmetric flux barrier is employed to adjust the saturation degree of the d-axis magnetic circuit under flux-weakening state. Additionally, the introduction of the asymmetrical flux barrier enables directional deflection of reluctance torque, thereby enhancing the output torque. The analysis results verify the effectiveness of the asymmetrical flux barrier design, which provide a wide speed regulation with constant power operation and high torque density for PM motors.