scholarly journals Theoretical aspects of optimization synchronous machine rotors

2020 ◽  
Vol 178 ◽  
pp. 01049
Author(s):  
Timur Petrov ◽  
Alfred Safin
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Oil Industry ◽  
Energy Performance ◽  
Synchronous Machine ◽  
Electric Machines ◽  
Aviation Industry ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Cooling Conditions

Permanent magnet synchronous electric machines are increasingly used in various drive technical complexes (oil industry, small generation, aviation industry, etc.). The presented optimization allows you to increase the energy performance of a synchronous machine without increasing the overall dimensions. Permanent magnet synchronous motors have become much more commonly operated in various drive technical complexes. For each drive complex, it is necessary to fulfil the requirements for the developed torque, cooling conditions and strength characteristics. The distribution of materials (topology) in the rotor casing of a synchronous machine (permanent magnets, iron, air, etc) determines the characteristics of permanent magnet synchronous electric machine.

scholarly journals Properties, Characteristics and Parameters of Permanent Magnet Synchronous Motors under Vector and Scalar Frequency Control

2019 ◽  
Vol 62 (3) ◽  
pp. 205-218 ◽  
Author(s):  
B. I. Firago ◽  
S. V. Aleksandrovsky
Keyword(s):  
Vector Control ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Frequency Control ◽  
Asynchronous Motor ◽  
Energy Performance ◽  
Permanent Magnet Synchronous Motors ◽  
Technical Literature ◽  
Synchronous Motors ◽  
Electric Drives

In order to improve energy performance and simplify the system of frequency control of the speed of electric drives, the area of application of synchronous frequency-controlled electric drives with both dependent and independent frequency setting of the voltage supplying the engine is being expanded. This is due to the fact that, as compared with asynchronous variable frequency drives, synchronous ones undergo lower power losses and they have rigid mechanical characteristics without speed feedback. Also, the simplest law of frequency control, viz. a proportional one, which, however, provides the maximum electromagnetic torque of the engine unchanged at R1 = 0 at all frequencies due to the constant magnetic flux, is applicable to a synchronous frequency controlled motor. Characteristics and properties of permanent magnet synchronous motors (PMSM) with the dependent frequency setting of supplied voltage (under vector control of PMSM) have been discussed and reviewed in technical literature quite sufficiently. It cannot be said about the PMSM with independent frequency setting reference which work under scalar frequency control. In the present article a comparison of properties and characteristics of vector and scalar frequency controlled PMSM is presented. For a scalar frequency controlled PMSM a function of the relative voltage g on the relative frequency a (g = f(a)) taking into account the PMSM parameters has been defined. The derived function g = f(a) differs from a proportional law of frequency control g = a. It is found that the influence of the parameters on the law of frequency control is small, and it can be applied without adjustment in most cases, in contrast to the frequency control of the asynchronous motor. For scalar frequency control, a method for determining the parameters of synchronous motors has been proposed in accordance with the parameters of synchronous motors with permanent magnets, which are given for operation under vector control. According to the presented methodology the OMRON SGMH-50D engine parameters have been determined for scalar frequency control and the function of g = f(a) have been computed.

scholarly journals Failure Diagnosis of Demagnetization in Interior Permanent Magnet Synchronous Motors Using Vibration Characteristics

2019 ◽  
Vol 9 (15) ◽  
pp. 3111 ◽  
Author(s):  
Takeo Ishikawa ◽  
Naoto Igarashi
Keyword(s):  
Vector Control ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Vibration Characteristics ◽  
Failure Diagnosis ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Light Load ◽  
Interior Permanent Magnet ◽  
High Degree

The detection of a precursor to the demagnetization of permanent magnets is very important because a high degree of reliability is necessary in permanent magnet synchronous motors (PMSMs). This paper investigated the diagnosis of very slight PM demagnetization. A part of the permanent magnet was altered to non-magnetic material so as to mimic the effect of demagnetization. The vibration characteristics were clarified for low demagnetization in PMSMs driven under vector control by experiments and 3D finite element (FE) analysis. We found that the amplitude of some components of the vibration was approximately proportional to the demagnetization level of the PM and the load torque. Therefore, the measurement of vibration and torque is very useful for the estimation of the magnetization level of PMSMs under vector control except for under very light load.

A new optimal design of surface mounted permanent magnet synchronous motors with integral slot per pole

2018 ◽  
Vol 37 (1) ◽  
pp. 136-152
Author(s):  
Behrooz Rezaeealam ◽  
Farhad Rezaee-Alam
Keyword(s):  
Magnetic Field ◽  
Optimal Design ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Air Gap ◽  
Permanent Magnet Synchronous Motors ◽  
Cogging Torque ◽  
Content Type ◽  
Synchronous Motors ◽  
Air Gap Magnetic Field

Purpose The purpose of this paper is to present a new optimal design for integral slot permanent magnet synchronous motors (PMSMs) to shape the air-gap magnetic field in sinusoidal and to reduce the cogging torque, simultaneously. Design/methodology/approach For obtaining this new optimal design, the influence of different magnetizations of permanent magnets (PMs), including radial, parallel and halbach magnetization is investigated on the performance of one typical PMSM by using the conformal mapping (CM) method. To reduce the cogging torque even more, the technique of slot opening shift is also implemented on the stator slots of analyzed PMSM without reduction in the main performance, including the air-gap magnetic field, the average torque and back-electromotive force (back-EMF). Findings Finally, an optimal configuration including the Hat-type magnet poles with halbach magnetization on the rotor and shifted slot openings on the stator is obtained through the CM method, which shows the main reduction in cogging torque and the harmonic content of air-gap magnetic field. Practical implications The obtained optimal design is completely practical and is validated by comparing with the corresponding results obtained through finite element method. Originality/value This paper presents a new optimal design for integral slot PMSMs, which can include different design considerations, such as the reduction of cogging torque and the total harmonic distortion of air-gap magnetic field by using the CM method.

scholarly journals Topological optimization of the rotors of permanent magnet synchronous motors

2020 ◽  
Vol 220 ◽  
pp. 01040
Author(s):  
Alfred Safin ◽  
Timur Petrov
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Rational Solution ◽  
Parameters Optimization ◽  
Topological Optimization ◽  
Electrical Machine ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Electromagnetic Processes ◽  
Solution Methods

Permanent magnet synchronous motors are increasingly used in the oil industry. These motors need to be made more energy efficient. To do this, it is necessary to optimize the rotor of a synchronous motor by changing the design through topological optimization. Designing an electrical machine as a heuristic process does not guarantee finding the best solution. Methods are needed that complement the experience and intuition of the designer to find the optimal (rational) solution. Topological optimization is currently performed using the finite element method to reduce mass and improve the stiffness of structures. The proposed method allows you to transfer topological optimization to electromagnetic processes in permanent magnet synchronous motors to determine the direction of magnetization and the size of permanent magnets, for a given mass-dimensional parameters. Optimization of the rotor of a serial permanent magnet motor based on a genetic algorithm is proposed. A new topology of the rotor of the motor was calculated and an increase in the torque was obtained by 18.2%, which indicates that topological optimization is promising for synchronous motors with permanent magnets.

scholarly journals Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets

2017 ◽  
Vol 65 (6) ◽  
pp. 833-843 ◽  
Author(s):  
X. Sun ◽  
B. Su ◽  
L. Chen ◽  
Z. Yang ◽  
K. Li
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Torque Ripple ◽  
Field Analysis ◽  
Magnetic Characteristics ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Magnetic Field Analysis ◽  
New Type

Abstract In this paper, a new type of interior composite-rotor bearingless permanent magnet synchronous motors (BPMSMs) with two layer permanent magnets (PMs) is proposed. In order to reduce the torque ripple of this kind of motors, the sizes of PMs are optimized. Moreover, the magnetic field analysis of the interior composite-rotor BPMSM with two layer PMs is carried out by the finite element method (FEM). The corresponding static electronic magnetic characteristics at no load, including magnetic field, PM flux linkage and inductance, are studied in detail. In addition, electromagnetic torque characteristics and suspension force characteristics are also investigated thoroughly. The results of the analysis and simulation lay a significant foundation for further research on the interior composite-rotor BPMSMs with two layer PMs.

Various types of traction synchronous motors for urban use

2021 ◽  
pp. 3-7
Author(s):  
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
High Efficiency ◽  
Asynchronous Motor ◽  
Good Alternative ◽  
Operating Conditions ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Inductor Motor ◽  
Urban Conditions

Asynchronous and valve-inductor (synchronous-reactive) motors have high efficiency at high rotor speeds, while permanent magnet synchronous motors (SPM and IPM) have high efficiency at low and medium frequencies. The latter are the most optimal for urban conditions, and the former for conditions of operation on highways and highways. Synchronous motors with permanent magnets are more expensive, so a good alternative to them can be synchronous-jet motors with permanent magnets, which determine the optimal balance of active and reactive torque, as well as efficiency. Keywords: synchronous motor, asynchronous motor, valve-inductor motor, synchronous-jet motor, permanent magnet, efficiency, operating conditions, reactive torque

scholarly journals Failure Diagnosis for Demagnetization in Interior Permanent Magnet Synchronous Motors

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Takeo Ishikawa ◽  
Naoto Igarashi ◽  
Nobuyuki Kurita
Keyword(s):  
Vector Control ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Low Frequency ◽  
Axial Direction ◽  
Permanent Magnet Synchronous Motors ◽  
Element Analysis ◽  
Synchronous Motors ◽  
Interior Permanent Magnet ◽  
Axis Position

Since a high degree of reliability is necessary for permanent magnet synchronous motors, the detection of a precursor for the demagnetization of permanent magnets is very important. This paper investigates the diagnosis of very slight PM demagnetization. The permanent magnet volume is altered so as to mimic the effect of demagnetization. This paper investigates the influence of demagnetization by using several methods: the 3D finite element analysis (FEA) of the motor, the measurement of high-frequency impedance, and the measurement and FEA of the stator voltage and current under vector control. We have obtained the following results. The back-EMF is proportional to permanent magnet volume, and there is no difference in the demagnetization in the radial direction and in the axial direction. Even harmonics and subharmonics of flux density at the teeth tip could be useful for diagnosis if a search coil is installed there. The relatively low frequency resistance at the d-axis position is useful for diagnosis. Under vector control, the stator voltage is useful except in an intermediate torque range, and the intermediate torque is expressed by a simple equation.

Influence of unbalanced magnetic force on shaft deflection in permanent magnet synchronous motor with fractional slot concentrated windings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1461-1468
Author(s):  
Ting Dong ◽  
Juyan Huang ◽  
Bing Peng ◽  
Ling Jian
Keyword(s):  
Permanent Magnet ◽  
Magnetic Force ◽  
Permanent Magnet Synchronous Motor ◽  
Operational Reliability ◽  
Topology Structure ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Shaft Deflection ◽  
Large Length ◽  
Fractional Slot

The calculation accuracy of unbalanced magnetic forces (UMF) is very important to the design of rotor length, because it will effect the shaft deflection. But in some permanent magnet synchronous motors (PMSMs) with fractional slot concentrated windings (FSCW), the UMF caused by asymmetrical stator topology structure is not considered in the existing deflection calculation, which is very fatal for the operational reliability, especially for the PMSMs with the large length-diameter ratio, such as submersible PMSMs. Therefore, the part of UMF in the asymmetrical stator topology structure PMSMs caused by the choice of pole-slot combinations is analysized in this paper, and a more accurate rotor deflection calculation method is also proposed.

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