This paper proposes a novel permanent magnet retarder (PMR) structure that uses water cooling to improve the braking performance of conventional PMR for heavy vehicles. A finite element model water-cooled was developed by considering temperature dependence magnetic characteristics and heat conductivity. The eddy current distribution were analyzed using magneto-thermal coupled method. Retarder tested at test bench. results show calculated torque agreed fairly well with measured results. PMRs...

A new permanent magnet retarder (PMR), which based on the principle of eddy-current braking, is proposed as an auxiliary braking apparatus for heavy vehicles. Its torque can be stepless adjusted by adjustment mechanism. multi-physics field coupling model was established, includes electromagnetic field, thermal and fluid field. The distributions three fields were calculated using finite-element method. To predict demagnetization magnet, a analysis method irreversible proposed, uses dynamic...

Trucks have the problems of frequent braking and long-term during long-slope transportation. As temperature traditional eddy current retarder is as high 500 °C braking, torque seriously degraded. According to principle thermal effect, this paper proposes an in which both stator excitation coil are water-cooled. The multi-field coupling bidirectional data transmission model field, field transient electromagnetic established. relationship between working time analyzed under continuous...

In this article, a clear and concise analytical method for predicting the performance of Liquid-cooling eddy current brake (LC-ECB) is proposed. The LC-ECB has coolant channel in rotor to allow direct cooling inner surface stator. static air-gap magnetic field distribution obtained by dynamic equivalent circuit (MEC) method, flux leakage global saturation effects are fully considered. intensity function reaction derived first time based on Ampere circuital theorem. Considering local skin...

Aiming at slippage and belt breakage of large mechanical conveyor belts, a new type water-cooled permanent magnet brake (WPMB) is proposed. In order to determine the braking performance WPMB, multi-physics coupling model analysis method magneto-thermal-structure are built. The torque temperature characteristics WPMB under different working conditions obtained. Based on magnetic vector potential equation, an electromagnetic eddy current established, variation trend with speed predicted. field...

To solve the problem of complex operating device and permanent magnets (PMs) demagnetization at high temperature, a new type magnet fluxed-switching coupler (PMC) with synchronous rotating adjuster is proposed. Its torque can be adjusted by switched flux angle between PMs along circumferential direction. The structural feature working principle PMC are introduced. analytical model novel was established. curves calculated in transient field using three-dimensional finite element method (3-D...

With the development of integrated circuit packaging technology, ultrasonic scanning detection technology is more and widely used in semiconductor industry. From chips to various MEMS electronic devices, they can be detect their internal defects. This paper introduces basic principle microscope system multilayer structure key defect judgment. includes a phase judgment algorithm based on amplitude variation A-scan waveform inversion. By marking layered defects, generate scanned images with...

Although the urban environment pollution is decreased by electric buses, driving range still a problem for car. Especially, there dramatic decline in while heating bus cabin winter. To solve this problem, authors propose an eddy-current braking and system. The energy converted to thermal directly electromagnetic method. conversion efficiency of system higher than that regenerative A management control strategy based on fuzzy proposed. dynamic programming algorithm simulated analysed...

To improve braking power density of the eddy current retarder, a novel hybrid excitation retarder was proposed. The work and control principle were introduced. analytical model established. electromagnetic field established by finite element method. air gap flux torque predicted results showed that larger than electric at same ampere turn number.

This paper introduced a hump rail brake equipment which used the Nd-Fe-B permanent magnet as energy source of force and control theory magnetic circuit. The focused on bringing forward design methods key parts, calculated circuit simulated system with ANSYS software. Through analyzing results machined model this reached actual application level provided new economic solving scheme for velocity control.

Aiming at the problems of large power consumption, serious heat-fade and failure to recover braking energy conventional eddy current retarder, a new electromagnetic liquid-cooled recovery retarder was proposed based on principle brake regenerative brake. The is composed liquid cooled single-phase reluctance motor. field model established by finite element method, performance predicted, opening closing angles motor were optimized, calculated during downhill continuous braking. simulation...

Wafer grinding is a key process for integrated circuit chip packaging. The air spindle, the core component of thinning equipment, directly affects TTV and roughness wafer grinding. In view requirement large stable force, this paper proposes new type spindle structure with bearing capacity high stiffness. working principle introduced, analytical formulas characteristics radial thrust are deduced by using volume flow method. relationship between parameters. Based on Reynolds equation NS...

The new energy vehicle industry has entered a stage of accelerated development, and the safety requirements vehicles have become higher higher. As one core components vehicles, IGBT (Insulated Gate Bipolar Transistor) determines conversion efficiency reliability vehicle. However, defects such as voids delamination in solder layer power module may cause junction temperature to be too high, resulting reduction chip or failure. Due high long life, it is necessary conduct all inspections...

Integrated circuit chip manufacturing is the core area of national strategy, and wafer bonding a key process for 3D advanced packaging. In order to solve error problems caused by optical alignment, large stroke motion position calibration. Based on magnetic tunnel junction effect, new alignment technology proposed in this paper, which expected reduce difficulty design manufacture equipment. The scheme mechanism are introduced. field distribution numerically simulated visualized. relationship...

Wafer grinding is a key process for chip packaging, and the temperature distribution of aerostatic spindle an important factor affecting accuracy equipment. Traditional spindles driven by induction motors will generate lot heat, which seriously affect wafer accuracy. In this paper, based on permanent magnet motor technology heat transfer theory, according to working characteristics spindle, embedded (ASEPM) designed. The mathematical model electromagnetic field ASEPM established, transient...