High-speed PMSM Research Articles

A Semi-Analytical Approach for the Optimization of High-Speed PMSM With Halbach Magnet Array

A Semi-Analytical Approach for the Optimization of High-Speed PMSM With Halbach Magnet Array

Design Considerations of High-Speed PMSM With Nonuniform Two-Segment Halbach Magnet Array

Design Considerations of High-Speed PMSM With Nonuniform Two-Segment Halbach Magnet Array

Inductance–Resistance Online Identification for Sensorless High-Speed PMSM Considering Resistive Characteristic of Invertor Nonlinearity

Inductance–Resistance Online Identification for Sensorless High-Speed PMSM Considering Resistive Characteristic of Invertor Nonlinearity

Mechanical Field Calculation and Analysis of a High Speed PMSM

Mechanical Field Calculation and Analysis of a High Speed PMSM

Robust Single-Side-Current Damping Framework of High-Speed PMSM With Sine Wave Filter Based on Novel Duty-Cycle Updating Mechanism

Robust Single-Side-Current Damping Framework of High-Speed PMSM With Sine Wave Filter Based on Novel Duty-Cycle Updating Mechanism

Sensorless Control Based on Discrete Fractional-order Terminal Sliding Mode Observer for High-Speed PMSM with LCL Filter

Sensorless Control Based on Discrete Fractional-order Terminal Sliding Mode Observer for High-Speed PMSM with LCL Filter

Extending the Harmonic Optimization Function of Capacitively Coupled Active Damper for LCL-Equipped High-Speed PMSM Drives

Extending the Harmonic Optimization Function of Capacitively Coupled Active Damper for LCL-Equipped High-Speed PMSM Drives

Simplified Continuous-Control-Set Model Predictive Control for LCL-Equipped High-Speed PMSM With High Dynamic Performance

Simplified Continuous-Control-Set Model Predictive Control for LCL-Equipped High-Speed PMSM With High Dynamic Performance

Discrete-Time Model Based Dynamic Decoupling Active Damping Current Control for CSI-Fed High-Speed PMSM with Low Carrier Ratio

Discrete-Time Model Based Dynamic Decoupling Active Damping Current Control for CSI-Fed High-Speed PMSM with Low Carrier Ratio

Mathematical Modeling of High-Speed PMSM Considering Rotor Eddy Current Reaction Effect

Mathematical Modeling of High-Speed PMSM Considering Rotor Eddy Current Reaction Effect

Motor Current Feedback-Only Active Damping Controller With High Robustness for LCL-Equipped High-Speed PMSM

This paper proposes a flexible active damping method for LCL-equipped high-speed permanent magnet synchronous motor. The damping ratio of the LCL resonance can be freely designed by the proposed high-order partial-state (virtual output voltage and the capacitor current) feedback. Moreover, a coefficient selection method is developed to complete the design of the damping system quickly and efficiently. As the main contribution, the proposal can easily apply to single-sensor (motor current feedback-only) applications to eliminate the sensor of the capacitor current with high parameter robustness. The experimental results of a 72kr/min test motor verify the stability and robustness of the proposed control strategy.

A Novel Energy Balance Control Method for a Modular Multilevel Converter in a High-Speed PMSM Drive Application

Nowadays, high-speed permanent magnet synchronous machines (HSPMSMs) are widely used in high-speed direct-drive applications. Moreover, modular multilevel converters (MMCs) have attracted a lot of attention. In this paper, the mathematical model of the MMC for the HSPMSM was built on high- and low-speed regions, respectively, and the control of each model is completely decoupled. Moreover, energy balance control schemes based on the common mode current injection of the MMC with HSPMSM drive applications have been proposed for high- and low-speed cases, respectively. Based on this model, the controller is proposed for high- and low-speed cases, respectively. Simulation and experiment results indicate that the proposed energy balance control method for an MMC in the high-speed PMSM drive application exhibits significant performance, which can ensure the energy balance of the MMC and eliminate the circulating current of the MMC directly.

Multiobjective Optimization and Multiphysics Design of a 5 MW High-Speed IPMSM Used in FESS Based on NSGA-II

The flywheel energy storage system (FESS) has high-power density and fast response speed, hence it is widely used as a pulse power supply. For the high-speed permanent magnet synchronous machine (HSPMSM) used in high-power FESS, there are two technical problems that need to be solved, including huge centrifugal forces of the rotor at a high-speed operation region and large phase currents at a low-speed operation region. In this paper, a 5 MW high-speed interior PMSM (HSIPMSM) is designed for FESS. The design goal of this electric machine is to reduce the maximum phase current at the lowest speed as much as possible while ensuring the rotor mechanical strength. Based on the response surface (RS) model and non-dominated sorting genetic algorithm II (NSGA-II), the multiobjective design of the HSIPMSM is accomplished using 29 groups of multiphysical field finite element analysis (FEA) sampling experiments. The computational cost is effectively reduced. In addition, the constant power optimal trajectory and control switching speed of the HSIPMSM are analyzed and discussed, and the reason that the constant power flux weakening region of the designed HSIPMSM is not wide and the maximum torque per ampere (MTPA) mode is adopted at a low-speed operation region is further illustrated.

Rotor Multidisciplinary Optimization of High Speed PMSM Based on Multi-Fidelity Surrogate Model and Gradient Sequential Sampling

High-speed permanent magnet synchronous motor (PMSM) is widely used in industrial applications because of the high-efficiency, but the disadvantages which limit its development are still severe, which include the low yield strength of permanent magnet material and the poor rotor dynamics performance, thus the stress and modal analysis of the high-speed rotor are important. The traditional multidisciplinary optimization numerical analysis of the different disciplines is too time-consuming because the optimization process requires multiple calls to the numerical models of the motor. Therefore, a multi-fidelity (MF) surrogate model is proposed to balance the accuracy and efficiency of the multidisciplinary optimization process, which uses the analytical models to establish the large low fidelity (LF) sample space and use numerical models to establish the small high fidelity (HF) sample space; then uses the hybrid sample space to train the surrogate models. And in order to reduce the total number of the sample points, a gradient sequential sampling is proposed. That sampling method can make the sampling process more efficient as well. After that, the multi-fidelity surrogate models are used to optimize the rotor system under the NSGA-II algorithm. Finally, a prototype is manufactured to verify the final optimal point.

Full-order adaptive sliding mode control with extended state observer for high-speed PMSM speed regulation

In order to achieve speed control of high-speed permanent magnet synchronous motor with high precision, the sliding mode control (SMC) is usually adopted. However, the inherent chattering phenomenon affects the speed control performance. In order to solve this problem, a composite speed regulator is proposed in this paper, which is made up of two parts: the adaptive full-order SMC and extended state observer (ESO). Switching gain adaption law is proposed for minimizing chattering as much as possible while ensuring the robustness of sliding mode control. The total disturbance is estimated by the ESO and through feedforward, thus improving the system anti-disturbance ability. Finally, the effectiveness of the proposed speed regulator has been validated in the test bench.

Transient Performance Improvement of Deadbeat Predictive Current Control of High-Speed Surface-Mounted PMSM Drives by Online Inductance Identification

This article presents an analytical derivation of transient performance deterioration for high-speed surface-mounted permanent magnet synchronous machine (SPMSM) drives under parameter mismatches, with an advanced deadbeat predictive current control (DBPCC), which exhibits fast dynamics and strong robustness with disturbances rejection. All the influential factors, including permanent magnet flux linkage and inductance mismatches, inverter nonlinearity, and speeds are taken into account in the analysis. It is shown that the transient performance with the advanced DBPCC is only dependent on inductance accuracy. Large transient overshoot and cross-coupling in the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dq</i> -axis currents at high speeds arise due to inductance mismatch. Based on the understanding gained through the analysis, a novel inductance identification method is also proposed in this article, which significantly improves the transient performance of high-speed SPMSM drives. The proposed online inductance identification method does not require signal injection, is nonintrusive, and can be easily implemented. By integrating the proposed method with the advanced DBPCC, the close-to-ideal deadbeat control can be achieved for high-speed SPMSM drives even in the presence of parameter mismatch and inverter nonlinearity. Both the analysis and proposed method have been validated experimentally on a prototype high-speed (30 000 r/min) SPMSM drive under various conditions.

Coupled Electromagnetic–LPTN Analysis Under Steady and Transient Overload Condition of High-Speed PMSM for Mechanical Vapor Recompression Applications

Coupled Electromagnetic–LPTN Analysis Under Steady and Transient Overload Condition of High-Speed PMSM for Mechanical Vapor Recompression Applications

New formulation of Loss-Surface Model for accurate iron loss modeling at extreme flux density and flux variation: Experimental analysis and test on a high-speed PMSM

The Loss-Surface (LS) model, commonly used for the prediction of iron losses in electrical machines, is reformulated for better accuracy and reliability when it is extrapolated beyond the parametric identification region. First, the dynamic hysteresis behaviors of typical soft magnetic materials are analyzed by both measurements and FE simulations. They are then described by the LS model using different mathematical formulations. The most relevant one, which requires 14 parameters to reproduce and extrapolate any loss surface, will be presented in this paper. The newly reformulated LS model is tested, in the last part, to estimate the iron losses of intrinsic measurements as well as of an electrical machine. In the first case, the results obtained of four different materials are generally within 5% error. And in the latter case of a high speed permanent magnet synchronous motor, by performing a study on the effects of manufacturing methods (punching and assemble) with respect to the iron losses, it is shown that the LS model provides an estimation with around 10% of deviation.

Analysis of alternating flux density harmonics inside the rotor of a 1 MW high-speed interior permanent magnet synchronous machine used for flywheel energy storage systems

With the popularization of renewable distributed energy generation in the power grid, flywheel energy storage systems (FESS) with fast response and high power density are gradually becoming popular for achieving fast frequency modulation. Generally, the rotor of high-speed permanent magnet synchronous machine (HSPMSM) used for FESS rotates in a vacuum to reduce air friction loss, which concurrently makes it difficult to dissipate heat in the rotor. For reducing rotor iron loss and preventing demagnetization of the PM due to high temperature, effective measures need to be applied. In this study, a 1 MW 10,500 r/min high-speed interior PMSM (HSIPMSM) is proposed for an FESS. As rotor iron loss is caused by alternating flux density harmonics (FDH) inside the rotor, the causes and characteristics of alternating FDHs are analyzed. Then, the finite element analysis (FEA) is combined with two-dimensional fast Fourier transform (2D-FFT) to obtain the alternating frequencies and amplitude variation trends of alternating FDHs in the designed rotor. The analytical results indicate that the amplitudes of alternating FDHs on the PM surface are effectively reduced due to bypass of the rotor core at the outside of the PM to alternating FDHs, which helps to restrain the rotor iron loss from the source. This provides a design idea for mitigating the high temperature of high-power high-speed PM rotors.

Mode Transition of Synchronous Optimal Modulation for High-Speed PMSM Drives

Mode Transition of Synchronous Optimal Modulation for High-Speed PMSM Drives