Analysis and Experimental Verification of Electromagnetic Vibration Mode of PM Brush DC Motors

IEEE Trans. Transp. Electrific.

Taghavifar

et al. 2021

Section: Electromagnetic Vibrationsupporting

confidence: 70%

“…Electromagnetic forces in a motor. times higher than the tangential force in an SRM [70], 33 times higher than in an PMSM/BLDC [71], and 49 times higher in an IM [66]. That means rotor-and statoreccentricity can produce a large radial force and severe vibration.…”

Section: Electromagnetic Vibrationmentioning

confidence: 96%

In-Wheel Motor Vibration Control for Distributed-Driven Electric Vehicles: A Review

IEEE Trans. Transp. Electrific.

Taghavifar

et al. 2021

“…Regardless of the EM forces f B ðα; tÞ or f H ðα; tÞ, their amplitudes are determined by B2 0 and Bv Z Bμ Z , respectively, in Equation (34). B2 0 and Bv Z Bμ Z are affected by I m and I S I R in Equation (25) and Equation (22). I m , I S and I R can be calculated by Equation (20), they are dominated by U S and s. The relationship between U S and s is given by Equation (18).…”

Section: Electromagnetic Excitation Forcesmentioning

confidence: 99%

“…In Ref. [25], a multi‐physical approach comprising an EM analytical model and a 3D structural FE model, was applied to study the vibration combined by pulsating and bending modes of direct current motors. The magnetic radial force was derived from an analytical model, and the dynamic response was calculated by a 3D structural FE model.…”

Section: Introductionmentioning

confidence: 99%

An integrated approach of a field‐circuit coupling model and multi‐physics finite‐element simulation for analysing transient electromagnetic vibration of pump motors

IET Electric Power Appl

Zhang

Wei

2022

We propose a method to investigate the generation mechanism of the transient vibration of a pump motor induced by electromagnetic (electromagnetic (EM)) forces. Compared with the steady vibration of a pump motor, the transient vibration characterised by a wider excitation frequency spectrum and larger instantaneous amplitude makes the vulnerable structure more easily exposed to potential damage. However, transient vibration of pump motor has not been analysed and verified before. Based on the fact that EM vibration dominates the vibration of pump motors, in this study, an approach which integrates the field-circuit coupling method and multi-physics finite-element (finiteelement (FE)) simulation is proposed to estimate the structural response of pump motors under transient operating conditions. To determine the factors that determine the EM forces, an analytical model describing the transient interaction between the EM and the fluid torque is first created. It was revealed that the input voltage and slip rate are two key factors that affect the transient EM forces. Then, to quantitatively describe the transient EM forces governed by a specific control scheme during the start-up process, a fieldcircuit coupling model embedding in the control scheme, electrical circuit model, motor FE model, and rotor dynamic model is established. This model allows the circuit equations, rotor dynamics equations, and magnetic field equations to be solved simultaneously. The transient EM forces obtained by the field-circuit coupling model provide excitation for the structural response calculation. Subsequently, a multi-physics FE simulation, which takes a weak coupling strategy between the EM and structural dynamics fields, is utilised to link the different physical domains. Thus, the EM forces are transferred to a structural domain to compute the structural response by adopting a direct integration method. The integration approach developed in this study was verified on the pump motors in the main cooling units of ultra-high voltage (UHV) converter stations. The trends of dominant components of simulated signals agree with the measured signals from the pump motors. This indicates that the proposed method can be widely applied for the transient vibration analysis and mitigation for pump motors.

“…Owing to the difficulty in predicting the magnetic field, there is rarely analytical calculation about the electromagnetic force of PM machine with rotor eccentricity. The related studies are mainly directed to the concentric machine [9, 10]. The radial electromagnetic force was calculated analytically and inspected for vibration monitoring of PM machine in [11].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic force density calculation in surface‐mounted PM synchronous machine with rotor eccentricity by an equivalent transformation method

Ren

Wang

IET Electric Power Applications

et al. 2020

An equivalent transformation method is proposed to calculate the electromagnetic force density of surface‐mounted permanent magnet (PM) synchronous machine with static and dynamic eccentricities. It hypothetically transforms the original, eccentric machine into a concentric one with redistributed PM remanence and current density according to equivalent transformation principle. On the basis of the magnetic field of the concentric machine obtained by the subdomain method, the air‐gap flux density of the eccentric machine is then achieved. Finally, the electromagnetic force density is predicted by the air‐gap field based on Maxwell stress tensor method and analysed by the two‐dimensional Fourier transform. The effectiveness of this method is verified on both static and dynamic eccentricities conditions by the finite‐element method and experiment.