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LUBRICATION FILM FORMATION MECHANISM OF SLIPPER PAIRS IN LOW SPEED HIGH TORQUE HYDRAULIC MOTORS 被引量:5
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作者 LI Yong SHI Guanglin CHEN Zhaoneng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第1期31-35,共5页
Pressure-flow analytical formulas of lubrication film of slipper pairs on camshaft connecting rod type low speed high torque (LSHT) hydraulic motors are put forward. The bottom surface of slipper pairs is rectangle,... Pressure-flow analytical formulas of lubrication film of slipper pairs on camshaft connecting rod type low speed high torque (LSHT) hydraulic motors are put forward. The bottom surface of slipper pairs is rectangle, and the effect of squeeze flow and pressure differential flow is considered. The dynamic process of lubrication film formation through squeezing is numerically studied by computer simulation. Effects of supply pressure, initial lubrication film thickness, velocity damping coefficient, loading impact and gravity, etc are studied. Advantages of novel slipper pairs with large oil cavity area are pointed out. 展开更多
关键词 Camshaft connecting rod Low speed high torque Hydraulic motor Slipper pair
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STRATEGY AND IMPLEMENTATION FOR HIGH-SPEED TORQUE ENHANCEMENT OF BRUSHLESS DC MOTOR 被引量:1
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作者 韦榕 许镇琳 蔡昆 《Transactions of Tianjin University》 EI CAS 2001年第2期76-80,共5页
Serious commutation lag occurs when a Brushless DC Motor(BLDCM) operates at high speeds,and this leads to torque decline with ripple.In this paper,an advanced conduction control scheme is proposed which can accelerate... Serious commutation lag occurs when a Brushless DC Motor(BLDCM) operates at high speeds,and this leads to torque decline with ripple.In this paper,an advanced conduction control scheme is proposed which can accelerate the commutation and enhance the torque production remarkably.Besides,an on line adjusting algorithm based on the Golden Section Method is adopted to search the optimal advanced conduction angle.Simulation and experimental results verify the feasibility and effectivity of the scheme proposed. 展开更多
关键词 BLDCM high speed torque optimal advanced conduction angle control
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Numerical simulation of the flow field of a flat torque converter 被引量:6
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作者 闫清东 刘城 魏巍 《Journal of Beijing Institute of Technology》 EI CAS 2012年第3期309-314,共6页
A flexible flat torque converter was proposed to fulfill the requirement of miniaturization and power density maximization for automobiles.Constructed by two arcs joined by lines,the torus was designed directly from d... A flexible flat torque converter was proposed to fulfill the requirement of miniaturization and power density maximization for automobiles.Constructed by two arcs joined by lines,the torus was designed directly from design path.The influence of flatness on the performance of the torque converter was evaluated.The software CFX and standard k-ε model were adopted to simulate the internal flow fields of the torque converter under different flatness ratios.The results indicated that the performance of the torque converter got worse as the flatness declined,but the capacity of pump increased.The efficiency and the torque ratio dropped slightly as the flatness ratio decreased.So the torque converter could be squashed appropriately to get high power density without too much efficiency sacrifice.But when the flatness ratio was below 0.2,there was a significant drop in the efficiency. 展开更多
关键词 torque converter 3D flow simulation flatness ratio efficiency high power density
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Application for Optimization of New Soft Magnetic Material Motor by Taguchi Method 被引量:1
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作者 Yixuan Song Xusheng Wu Wei Gao 《CES Transactions on Electrical Machines and Systems》 CSCD 2022年第3期261-268,共8页
The application of new soft magnetic materials in permanent magnet motor can effectively reduce the loss of motor and improve the efficiency of motor. Taguchi method is a local multivariable and multi-objective optimi... The application of new soft magnetic materials in permanent magnet motor can effectively reduce the loss of motor and improve the efficiency of motor. Taguchi method is a local multivariable and multi-objective optimization method widely used in various engineering problems, which can effectively improve the efficiency of engineering optimization. In this paper, based on a 25 kW, 1700 r/min three-phase permanent magnet motor, the relevant motor model is established in the finite element simulation software, and the relevant simulation analysis is carried out. Combined with Taguchi method optimization, the local optimal structure scheme is obtained. Through optimization, the motor can maintain high efficiency, reduce the cogging torque of the motor by 53.45%, reduce the torque ripple by 36.79%, and increase the torque generated by the permanent magnet per unit mass by 21.42%. Through this optimization, the overall performance of the motor has been significantly improved. The research content of this paper verifies the feasibility of the application of Taguchi method in the optimization of new soft magnetic material motor, provides a new idea for the optimization design of new soft magnetic material motor, and also provides a certain reference for the local multi-objective optimization of the electromagnetic structure of other similar motors. 展开更多
关键词 Motor optimization Taguchi method New soft magnetic Multi-objective optimization high torque motor
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Development of a New Flux Switching Transverse Flux Machine with the Ability of Linear Motion 被引量:4
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作者 Chengcheng Liu Shaopeng Wang +3 位作者 Youhua Wang Gang Lei Youguang Guo Jianguo Zhu 《CES Transactions on Electrical Machines and Systems》 2018年第4期384-391,共8页
This paper proposes a new rotary flux switching transverse flux machine with the ability of linear motion(FSTFMaLM),in which both the stator and the rotor cores are made by using soft magnetic composite(SMC)materials.... This paper proposes a new rotary flux switching transverse flux machine with the ability of linear motion(FSTFMaLM),in which both the stator and the rotor cores are made by using soft magnetic composite(SMC)materials.With the special design pattern,for the rotary motion model,the proposed machine can combine both the advantages of the flux switching permanent magnet machine(FSPMM)and the transverse flux machine(TFM).It can output with relatively high torque density,and as there is no windings or the magnets on the rotor cores,the proposed machine can operate in the high speed region to improve the output power.With the adoption of the SMC materials,the manufacturing of this machine can be quite easy.By stacking the rotor core together and prolong it with the determined length in the axial direction,in addition with the special control algorithm,the proposed machine can have the ability of the linear motion.In this paper,the operation principle of this machine has been explained and the design methods are also presented.To seek the better performance,the main dimension of the machine is optimized,and for the performance evaluation,the finite element method(FEM)is adopted.The proposed machine can be used for the electric driving systems,robotic systems or other applications where the linear motion ability is required. 展开更多
关键词 Flux switching linear motion high torque density soft magnetic composite(SMC) transverse flux machine
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A Novel Axial Flux Stator and Rotor Dual Permanent Magnet Machine 被引量:1
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作者 Yunchong Wang W.N.Fu Xingjian Li 《CES Transactions on Electrical Machines and Systems》 2017年第2期140-145,共6页
A novel structure of axial flux stator and rotor dual PMs Vernier machine is presented as an effective option for high torque-density direct-driven applications.The key is to locate PMs on both sides of rotor and stat... A novel structure of axial flux stator and rotor dual PMs Vernier machine is presented as an effective option for high torque-density direct-driven applications.The key is to locate PMs on both sides of rotor and stator.With dual PMs,this proposed machine with a novel structure generates an improved torque per armature current at low speed.It is very suitable for direct drive applications with limited space such as the in-wheel electric vehicle(EV)motors.The theory of the structure with PMs on both sides is analyzed theoretically.The structure and operation principle of machine are introduced and the steady and steady performance of machine is analyzed and verified with time-stepping finite element method(TS-FEM). 展开更多
关键词 DIRECT-DRIVE finite element method flux modulation high torque density permanent magnets
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How does a woodpecker work? An impact dynamics approach 被引量:1
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作者 Yuzhe Liu Xinming Qiu +2 位作者 Tongxi Yu Jiawei Tao Ze Cheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2015年第2期181-190,共10页
To understand how a woodpecker is able accelerate its head to such a high velocity in a short amount of time,a multi-rigid-segment model of a woodpecker's body is established in this study.Based on the skeletal speci... To understand how a woodpecker is able accelerate its head to such a high velocity in a short amount of time,a multi-rigid-segment model of a woodpecker's body is established in this study.Based on the skeletal specimen of the woodpecker and several videos of woodpeckers pecking,the parameters of a three-degree-of-freedom system are determined.The high velocity of the head is found to be the result of a whipping effect,which could be affected by muscle torque and tendon stiffness.The mechanism of whipping is analyzed by comparing the response of a hinged rod to that of a rigid rod.Depending on the parameters,the dynamic behavior of a hinged rod is classified into three response modes.Of these,a high free-end velocity could be achieved in mode II.The model is then generalized to a multihinge condition,and the free-end velocity is found to increase with hinge number,which explains the high free-end velocity resulting from whipping.Furthermore,the effects of some other factors,such as damping and mass distribution,on the velocity are also discussed. 展开更多
关键词 Woodpecker Muscle torque high impact velocity Whipping Hinged rod
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Cooling and Optimization in the Groove of the Outer Rotor HubMotor
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作者 Zhuo Liu Yecui Yan 《Frontiers in Heat and Mass Transfer》 EI 2024年第5期1443-1460,共18页
The external rotor hub motor adopts direct drive mode,no deceleration drive device,and has a compact structure.Its axial size is smaller than that of a deceleration-driven hub motor,which greatly reduces the weight of... The external rotor hub motor adopts direct drive mode,no deceleration drive device,and has a compact structure.Its axial size is smaller than that of a deceleration-driven hub motor,which greatly reduces the weight of the vehicle and increases the cruising range of the vehicle.Because of the limited special working environment and performance requirements,the hub motor has a small internal space and a large heat generation,so it puts forward higher requirements for heat dissipation capacity.For the external rotor hub motor,a new type of in-tank watercooled structure of hub motor was proposed to improve its cooling effect and performance.Firstly,the threedimensional finite element model of the motor is established to analyze the characteristics of motor loss and temperature field distribution.Secondly,the cooling performance of different cooling structures in the tank was studied.Finally,the thermal network model and three-dimensional finite element analysis were used to optimize the water-cooled structure in the tank,and the power density of themotor was improved by improving the cooling performance under the condition of volume limitation of the hub motor.The results show that the cooling effect of the proposed water-cooled structure in the tank is significant under the condition of constant power density.Compared to natural ventilation,the maximum temperature was reduced by 33.13°C and the cooling effect was increased by about 27.7%. 展开更多
关键词 Outer rotor hub motor temperature field water cooling in the tank motor loss thermal networks high torque density
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A Novel Stator and Rotor Dual PM Flux Modulated Machine
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作者 Yunchong Wang W.N.Fu +1 位作者 Shuangxia Niu Xingjian Li 《Chinese Journal of Electrical Engineering》 CSCD 2017年第1期10-15,共6页
A novel structure of Veriner permanent magnet(VPM)machine is presented as an effective option for high torque density direct-driven applications.The key is to locate PMs on both sides of rotor and stator,and design th... A novel structure of Veriner permanent magnet(VPM)machine is presented as an effective option for high torque density direct-driven applications.The key is to locate PMs on both sides of rotor and stator,and design the stator PMs as a cylinder shape,the rotation of which can be controlled by an external driven system.With this design,magnetic field in the airgap can be directly regulated by the rotation of stator PMs.The structure and operation principle are introduced and the performance is analyzed with time-stepping finite element method(FEM).Analysis results show that the novel structure has really high torque density and good field weakening performance. 展开更多
关键词 Directly-driven finite element method flux modulation high torque density permanent magnets
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