Relationship between stator core buckling, core losses, vibration and local over-temperatures

1988 ◽  
Vol 3 (1) ◽  
pp. 56-63 ◽  
Author(s):  
K.N. Lehoczky
Keyword(s):  
Stator Core ◽  
Core Losses

Time-stepping finite element analysis on the influence of rotational flux on local core losses of AC electrical machines

2013 ◽  
Vol 33 (1/2) ◽  
pp. 126-136
Author(s):  
Zhao Haisen ◽  
Liu Xiaofang ◽  
Cui Xueshen ◽  
Luo Yingli
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Machines ◽  
Stator Core ◽  
Element Analysis ◽  
Content Type ◽  
Time Stepping ◽  
Harmonic Field ◽  
Core Losses ◽  
Element Method

Purpose – The purpose of the paper is to study the influence of rotational flux on local core losses of the motors, which is difficult to distinguish the iron losses caused by rotational flux in certain electric machines through experiment. Therefore, time-stepping finite element method (T-S FEM) is used to consider the rotational flux and to predict the local core losses. Design/methodology/approach – Time-stepping finite element method. Findings – It is found that, in stator side, rotational flux mainly exists in tooth root and yoke area near the bottom of stator slot, those area is about 45 percent of total stator core area; in rotor side, due to slot harmonic field, the rotational flux mainly exists in the tip of tooth. Originality/value – Through analyzing the magnetization characteristics at different positions in stator and rotor cores by T-S FEM, the influence of rotational flux on local core losses of AC electric machines is studied.

A Model- Based Detection Method for Stator Core Fault in Induction Motors

2012 ◽  
Vol 588-589 ◽  
pp. 1068-1071
Author(s):  
Xu Hong Wang ◽  
Hui Zhi Liu
Keyword(s):  
Detection Method ◽  
Equivalent Circuits ◽  
Stator Core ◽  
Core Losses ◽  
Zero Sequence ◽  
On Line ◽  
Coordinate Model ◽  
Stator Fault ◽  
Negative Sequence Current ◽  
Asymmetrically Distributed

An on-line method to detect induction motor stator core fault by stator negative sequence current is proposed in this paper. New equivalent circuits including the positive, negative and zero sequence equivalent circuits are is obtained by the existing abc coordinate model. In the circuits, the stator core losses is increased and asymmetrically distributed among the three phases when a stator fault happens. Experiment results prove the effectiveness of this method.

scholarly journals Analysis of Core Loss of Permanent Magnet Synchronous Machine for Vehicle Applications under Different Operating Conditions

2020 ◽  
Vol 10 (20) ◽  
pp. 7232
Author(s):  
Guohui Yang ◽  
Shuo Zhang ◽  
Chengning Zhang
Keyword(s):  
Permanent Magnet ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Core Loss ◽  
Operating Conditions ◽  
Permanent Magnet Synchronous Machines ◽  
Stator Core ◽  
Core Losses ◽  
Novel Method ◽  
Maximum Torque Per Ampere

Permanent magnet synchronous machines (PMSMs) are widely used in electric vehicles due to their high power density, high efficiency, etc. Core losses account for a significant component of the total loss in PMSMs. Therefore, it is necessary to carefully consider it when designing PMSMs according to actual scientific research project applications. This paper extracts the characteristic operating points of the PMSMs under different operating conditions at different speeds. Then a harmonic analysis of air-gap flux density, phase current, core loss was completed, and detailed comparative analysis was performed. A novel method for comprehensively analyzing the stator core loss of PMSMs for vehicles is proposed, which reveals the law of the core loss of the PMSM under Maximum-Torque-Per-Ampere (MTPA) and Space Vector Pulse Width Modulation (SVPWM). The method was verified by a prototype experiment where the actual core loss of PMSMs was measured to verify the correctness of the method. This research provides a reference for accurately predicting core loss during the forward design of PMSMs and completing core loss evaluation for existing PMSMs.

A novel method to predict the influence of rotor structures on the core loss of permanent magnet synchronous machines

2021 ◽  
pp. 1-14
Author(s):  
Guohui Yang ◽  
Chengning Zhang ◽  
Shuo Zhang
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Core Loss ◽  
Synchronous Machines ◽  
Magnetic Flux Density ◽  
Permanent Magnet Synchronous Machines ◽  
Stator Core ◽  
Element Analysis ◽  
Core Losses ◽  
Rotor Structure

Permanent magnet synchronous machines (PMSMs) are widely used owing to high power density, high efficiency, etc. Core losses account for a significant component of the total loss in PMSMs beside winding losses. Therefore, it is necessary to consider core losses when designing PMSMs according to actual research applications. In this paper, taking four typical rotor structures (surface-mounted, embedded, “—” shape, “V” shape) as examples, an analysis method is proposed to predict the influence of different rotor structures on core loss of PMSMs. In the case of the same stator and winding structures, due to the influence of the rotor structure on the magnetic circuit, the corresponding variation law of the magnetic field in the stator core is studied. This method analyzes the radial and tangential components of magnetic flux density vector of the 4 representative points (stator tooth tip, middle tooth and yoke part), and then evaluates the entire core loss through finite element analysis results. In order to verify the method, a prototype was manufactured. The experimental results show good performance of the proposed method of this paper. It provides reference for selecting the appropriate rotor structure and designing the corresponding PMSM according to different specification.

Research on the Influence of Harmonics on High-Speed Permanent Magnet Motor

2013 ◽  
Vol 690-693 ◽  
pp. 3275-3278
Author(s):  
Hong Cui ◽  
You Qing Gao
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Stable Operation ◽  
Permanent Magnet Motor ◽  
Stator Core ◽  
Current Harmonics ◽  
Core Losses ◽  
Key Issues ◽  
Motor Control System ◽  
Rotor Losses

The influence of current harmonics on high-speed permanent magnet motor is analyzed in this paper. The several aspects influence of current harmonics are analyzed in detail such as on the stator core losses, copper losses, as well as additional losses, the rotor losses, the electromagnetic torque etc. The necessity of suppressing current harmonics for high-speed motor stable and reliable running and the key issues of high-speed motor control system stable operation is stated.

scholarly journals Core losses of a permanent magnet synchronous motor with an amorphous stator core under inverter and sinusoidal excitations

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056804 ◽  
Author(s):  
Atsushi Yao ◽  
Takaya Sugimoto ◽  
Shunya Odawara ◽  
Keisuke Fujisaki
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Stator Core ◽  
Core Losses
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