Effects of static eccentricity on the no‐load back electromotive force of external rotor permanent magnet brushless DC motor used as in‐wheel motor

Ma, Chunfeng; Li, Qiongyao; Zheng, Ping; Zhou, Shengsen; Gao, Haibo; Fang, Jianguang; Wang, Yanyan

doi:10.1049/iet-epa.2018.5394

Cited by 10 publications

(15 citation statements)

References 29 publications

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“…If the parallel branch number is equal to 1, three unit motors are in series and no‐load back‐EMF can be calculated [28, 29]

({, \begin{matrix} 1em4pt \\ e_{A normal_a 1} = \sum_{i \in A} \frac{1}{2} k_{i} N_{s} L ω r B_{r} ()(, R_{s}, θ_{i}, t) \\ e_{B normal_a 1} = \sum_{i \in B} \frac{1}{2} k_{i} N_{s} L ω r B_{r} ()(, R_{s}, θ_{i}, t) \\ e_{C normal_a 1} = \sum_{i \in C} \frac{1}{2} k_{i} N_{s} L ω r B_{r} ()(, R_{s}, θ_{i}, t) \end{matrix})

where, when slot i contains single‐ or two‐phase conductors, k i = 2 or k i = 1, respectively, i = 1, 2,…,27.…”

Section: Analytical Model Of No‐load Back‐emfmentioning

confidence: 99%

“…In addition, in [28], the effects of SE fault on no-load back-EMF of external rotor PM DC brushless motor with 46 poles and 51 slots are discussed. However, there are three areas for improvement in [28]:…”

Section: Introductionmentioning

confidence: 99%

“…(i) In [28], the number of unit motors of external rotor PM DC brushless motor is equal to 1, so the effects of SE fault on no-load back-EMF is only applicable to the motor with 1 unit motor. When the number of unit motors is >1, the asymmetry of three-phase noload back-EMF of a single unit motor will be offset due to the series and parallel connections of multiple unit motors.…”

Section: Introductionmentioning

confidence: 99%

“…When the number of unit motors is >1, the asymmetry of three-phase noload back-EMF of a single unit motor will be offset due to the series and parallel connections of multiple unit motors. Therefore, the law revealed in [28] is not applicable to SE fault diagnosis of the motor with a unit motor number >1. (ii) The authors of [28] only studied the effects of the SE ratio on no-load back-EMF, ignoring the effects caused by SE circumferential angle.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the law revealed in [28] is not applicable to SE fault diagnosis of the motor with a unit motor number >1. (ii) The authors of [28] only studied the effects of the SE ratio on no-load back-EMF, ignoring the effects caused by SE circumferential angle. Nevertheless, SE circumferential angle will also significantly cause the asymmetry of three-phase no-load back-EMF.…”

Section: Introductionmentioning

confidence: 99%

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Eccentric position diagnosis of static eccentricity fault of external rotor permanent magnet synchronous motor as an in‐wheel motor

Gao

Wang

et al. 2020

IET Electric Power Applications

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An eccentric position diagnosis method of static eccentricity (SE) fault of external rotor permanent magnet synchronous motor (ER‐PMSM) is presented. Firstly, an analytical model of no‐load radial magnetic field of ER‐PMSM is established. Analytical models of no‐load Back‐EMF of both unit motors and the whole motor are carried out and are verified by finite element method (FEM) and experimental measurements. Then, the influences of SE ratio, SE circumferential angle, winding distribution mode and number of parallel branches on no‐load radial magnetic field and no‐load Back‐EMF are analyzed based on these analytical models. The results show that SE does not affect the frequency characteristics of no‐load radial magnetic field, but changes space order characteristics. On one hand, for ER‐PMSM, of which the number of unit motors is equal to 1, SE causes no‐load Back‐EMF distortion. On the other hand, for ER‐PMSM, of which the number of unit motors is greater than 1, SE does not affect no‐load Back‐EMF of the whole motor, but it still leads to no‐load Back‐EMF distortion of unit motors. Therefore, based on total harmonic distortion (THD) of no‐load Back‐EMF of unit motor, a projection method of intersection lines for SE fault diagnosis of ER‐PMSM is proposed finally.

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“…If the parallel branch number is equal to 1, three unit motors are in series and no‐load back‐EMF can be calculated [28, 29]