Interior permanent magnet synchronous motor minimum current harmonics torque ripple suppression strategy based on magnetic co-energy model

This study describes the development of the world’s smallest interior permanent magnet synchronous motor (IPMSM) to increase the torque density of micromotors. The research evaluates the feasibility of the miniaturization of IPMSM since recent studies in this area focus on medium to large size compressor and traction motor applications. The standard-type and spoke-type IPMSM were selected for ease of micro machining. In order to surpass the performance of an inset motor of the same size used in previous research, the interior motors were designed with a different slot pole number, permanent magnet shape and rotor structure. Two types of interior motors were manufactured and tested to compare their performance. It was shown that the spoke-type interior motor had a better output torque, while the standard-type interior motor had a lower torque ripple, and both motors matched the specifications of commercially available motors. To achieve a higher torque density, the IPMSM designs increased the slot pole number from 6 slots 4 poles to 9 slots 6 poles. The torque density of the spoke-type motor was increased by 48% compared to the inset motor. The disadvantage is that the new design has a greater number of parts and smaller size, resulting in difficulties in manufacturing and assembly.

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Sensitivity-Based Optimization of Interior Permanent Magnet Synchronous Motor for Torque Characteristic Enhancement

Energies ◽

10.3390/en14082240 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2240

Author(s):

Sajjad Ahmadi ◽

Thierry Lubin ◽

Abolfazl Vahedi ◽

Nasser Taghavi

Keyword(s):

Sensitivity Analysis ◽

Finite Element ◽

Permanent Magnet ◽

Permanent Magnet Synchronous Motor ◽

Computational Cost ◽

Torque Ripple ◽

Synchronous Motor ◽

Element Analysis ◽

Multi Objective ◽

Interior Permanent Magnet

This paper presents a multi-objective optimal rotor design for an interior permanent magnet synchronous motor (IPMSM) based on finite element analysis. Due to the importance of torque characteristic in electromagnetic design of IPMSMs, the main efforts of this study are focused on finding a proper trade-off for its torque profile challenges. In this regard, in order to attain high average torque and low torque ripple, the influence of several key factors, such as the permanent magnet (PM) arrangements, PM positions and PM sizes, are examined. Subsequently, according to the outcomes of the performed sensitivity analysis, the appropriate variation interval of the parameters as well as their initial values is determined. Employing such a deterministic optimization algorithm, which does not need large sample points, minimizes the finite element computational cost and leads to accelerate the convergence process. The two-dimensional finite element model (FEM) of an IPMSM is used to perform a sensitivity analysis and establish a multi-objective FEM-based optimization.

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Harmonic Suppression Strategy in Flux-Weakening Control of Interior Permanent Magnet Synchronous Motor Using Repetitive Controllers

10.23919/icems52562.2021.9634310 ◽

2021 ◽

Author(s):

Yao Chen ◽

Chaohui Zhao ◽

Lisi Tan ◽

Zhaoyuan Zhang

Keyword(s):

Permanent Magnet ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Harmonic Suppression ◽

Interior Permanent Magnet ◽

Suppression Strategy ◽

Flux Weakening Control ◽

Flux Weakening

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An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor

Electronics ◽

10.3390/electronics8070769 ◽

2019 ◽

Vol 8 (7) ◽

pp. 769 ◽

Cited By ~ 5

Author(s):

Guozheng Zhang ◽

Chen Chen ◽

Xin Gu ◽

Zhiqiang Wang ◽

Xinmin Li

Keyword(s):

Cost Function ◽

Permanent Magnet ◽

Permanent Magnet Synchronous Motor ◽

Torque Ripple ◽

Synchronous Motor ◽

Torque Control ◽

Flux Control ◽

Interior Permanent Magnet ◽

Improved Model ◽

The Cost

In conventional model predictive control, the dimensions of the control variables are different from each other, which makes adjusting the weighted factors in the cost function complicated. This issue can be solved by adopting the model predictive flux control. However, the performance of the electromagnetic torque is affected by the change of the cost function. A novel model predictive torque control of the interior permanent magnet synchronous motor is presented in this paper, and the cost function involving the excitation torque and reluctance torque is established. Combined with the model predictive flux control and discrete space vector modulation, the current ripple and torque ripple are reduced. The performance of torque under an overload condition is superior to model predictive flux control. The effectiveness of the proposed algorithm is verified by the simulation and experimental results.

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