scholarly journals The Unbalanced Radial Force of In-Wheel Switched Reluctance Motors Effect on Vehicle Performance under Stability Condition

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yanyang Wang ◽  
Funing Yang ◽  
Fuxing Shang ◽  
Qing Xiong
Keyword(s):  
Stability Condition ◽  
Stability Criterion ◽  
Radial Force ◽  
Mode Analysis ◽  
Vehicle Stability ◽  
Vertical Force ◽  
Switched Reluctance Motors ◽  
Vehicle Performance ◽  
Switched Reluctance ◽  
Vehicle System

This paper studies the unbalanced radial force of in-wheel switched reluctance motors effect on vehicle performance under stability condition. First, the IWM-EV vehicle model which highlights the new factors of the rotor, stator, SRM vertical force, and airgap deflection was adopted. And the vehicle comparison models were established to make a contrastive study about IWM-EV new structure effects. Then, Routh’s stability criterion method was adopted to judge the vehicle system’s stability condition. It includes two parts: characteristic polynomial of the vehicle system which is served to calculate the IWM-EV system Routh array and Routh’s stability criterion which is used to judge the vehicle system’s stability condition. The effect of the new structure on vehicle performance was further discussed under stability condition. It mainly includes two aspects: vehicle vibration mode analysis which is used to study vehicle vibration characteristics and amplitude-frequency analysis which is served to research transfer response characteristics of the vehicle system. The result shows that the new structure of IWM-EV has a negative effect on vehicle stability performance. The SRM vertical force will change vehicle stability characteristic. In some severe cases, it will even destroy IWM-EV’s stability.

scholarly journals FxLMS Method for Suppressing In-Wheel Switched Reluctance Motor Vertical Force Based on Vehicle Active Suspension System

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Yan-yang Wang ◽  
Yi-nong Li ◽  
Wei Sun ◽  
Chao Yang ◽  
Guang-hui Xu
Keyword(s):  
Vertical Component ◽  
Active Suspension ◽  
Radial Force ◽  
Suspension System ◽  
Vertical Force ◽  
Least Mean Square ◽  
Active Suspensions ◽  
Switched Reluctance ◽  
Resonance Frequencies ◽  
Suspension Performance

The vibration of SRM obtains less attention for in-wheel motor applications according to the present research works. In this paper, the vertical component of SRM unbalanced radial force, which is named as SRM vertical force, is taken into account in suspension performance for in-wheel motor driven electric vehicles (IWM-EV). The analysis results suggest that SRM vertical force has a great effect on suspension performance. The direct cause for this phenomenon is that SRM vertical force is directly exerted on the wheel, which will result in great variation in tyre dynamic load and the tyre will easily jump off the ground. Furthermore, the frequency of SRM vertical force is broad which covers the suspension resonance frequencies. So it is easy to arouse suspension resonance and greatly damage suspension performance. Aiming at the new problem, FxLMS (filtered-X least mean square) controller is proposed to improve suspension performance. The FxLMS controller is based on active suspension system which can generate the controllable force to suppress the vibration caused by SRM vertical force. The conclusion shows that it is effective to take advantage of active suspensions to reduce the effect of SRM vertical force on suspension performance.

Torque Ripple Reduction of Switched Reluctance Motor by Optimizing Stator Pole Type

2014 ◽  
Vol 494-495 ◽  
pp. 1395-1400 ◽  
Author(s):  
Hong Xing Wu ◽  
Qing Jie Sun ◽  
Ji Gui Zheng ◽  
Shou Ming Zhou
Keyword(s):  
Tangential Force ◽  
Wedge Angle ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Radial Force ◽  
Switched Reluctance Motors ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
The Right ◽  
Air Gap Magnetic Field

The torque ripple is the important restriction affecting the promotion and application of switched reluctance motor, the analytic expressions to calculate switched reluctance motors tangential force and radial force are derived in this paper, based on analyzing the cause of switched reluctance motor vibration and torque ripple. By improving the stator poles structure, the torque near the commutation points is compensated, which smooth the wave of air gap magnetic field to reduce torque ripple when the stators and the rotors salient poles coincide. In this paper, three structures that puts wedge angle on both sides of the stator poles is presented, and analysis of torque ripple is made. Studies shows that the right size of wedge angle can effectively inhibit the switched reluctance motor torque fluctuations.

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