Given the problem that drive system of traditional mine transportation winch outputs a large traction force through cooperation an induction motor and reducer to meet needs traffic volume heavy-load starting, this paper studies low-speed high-torque dual-stator permanent magnet direct with separated magnetic circuit. The tinner is torque motor, outer which characterized by no circuit coupling independent control. proposed has excellent heavy load starting ability operation efficiency, it...

This paper proposes a novel modular permanent magnet-assisted synchronous reluctance motor (MPMA-SynRM) structure. The rotor is composed of two types modules that are axially combined. article analyses and explains the combined angle axial assembly different modules. MPMA-SynRM module optimized using differential evolution algorithm space vector diagram established to give torque calculation an analytical expression. Whether there magnetic isolation between rotors analysed, various segment...

To solve the problems of large-size machining and complex control fault-tolerant permanent magnet machines, a module-combined stator synchronous machine is proposed in this paper. The winding has two forms: large small spans. independent power supply each module adopted to decouple electricity between module, which enhances manufacturing flexibility ability motor. A mathematical model established, design method summarized. Then analytical formula radial force acting on under asymmetric...

The technology of extra-high voltage multi-circuit transmission lines on same tower is one novel transmitting technology, which can obviously decrease the route way resource, and capacity per area increased prominently. But its electromagnetic environment problem keys affect feasibility EHV lines, so it's important to study environment. This paper calculates electric field intensity magnetic generated by in different phase line sequences modes. We accurately obtain distribution under using...

The hydrophosphination of heterocumulenes with Ph 2 PH using diethylzinc as precatalyst in neat conditions, which shows excellent catalytic effects. Intermediate is characterized to corroborate the proposed mechanism.

It is well known that the use of slotted stators in motors produces undesirable effects, such as magnetic flux distortion, additional losses, ripple torque, and vibration. However, a large number studies pay more attention to stator slots slot wedges (MSW) asynchronous permanent magnet motors, ignoring same problems capacity high voltage line start synchronous (HVLSPMSM). In order disclose effect on HVLSPMSMs, no-load air gap field distribution leakage reactance are studied. Meanwhile,...

A cheap and easily available ZnEt 2 is an effective precatalyst, which can be used for the hydroboration reaction of various organic carbonates esters with HBpin.

Contactless electrical energy transmission becomes more and attractive for different applications. In this system, the design of separable transformer is very important. The paper uses mutual inductance model to analyze coupling ability primary coil secondary coil. investigations are carried out by means ANSYS simulation measurements. Through analysis, four factors affecting output power system presented. So proposes a new method high coefficient circle And simulations on based have been...

It is difficult to meet the engineering requirements for a high-torque-density direct drive (HTDDD) permanent magnet synchronous machine (PMSM) using thermal load design method traditional motors. In this study, waterway structure HTDDD PMSM depending on motor capacity proposed based temperature cycling module. The program of calculation and an equivalent network method. can be rapidly designed by cyclic checking at each node in motor. A fluid-solid coupled field simulation used analyze...

The traditional canned electric valve consists of an induction motor and a reducer, which need to be matched with the position sensor achieve precise control position. reducer are not only easily damaged in high-temperature liquids, but also slip rate is greatly affected by liquid temperature, makes it difficult accurate control. To address above problems, this paper introduces new topology permanent magnet synchronous (CEV-PMSM), maximum torque per ampere (MTPA) model proposed. MTPA...

The social impact of China’s policy phasing out excess coal production since the 2010s is examined through lens “just transition.” Qualitative fieldwork undertaken in Liupanshui, Guizhou province, focussed on seven mines, among which three were decommissioned. Against backdrop top‐down imperatives aimed at rapidly reducing capacity, more powerful stakeholders took action to safeguard their own perceived interests, thereby transferring costs transition least actors while exacerbating existing...

Background Right ventricular systolic dysfunction (RVSD) in patients with sepsis is an area of growing interest, but its prognostic significance remains unclear and additional tools are needed to improve our understanding. free wall strain (RV-FWS) a relatively new parameter assess RV function. This study aimed investigate the potential correlation between impaired RV-FWS outcomes sepsis. Methods We prospectively assessed right function within initial 24 h their hospital admission. RV-FWS,...

This paper attempts to present the structures and characteristics of multipolar permanent magnet synchronous submersible motor (MPMSSM) for screw pump. The stator lamination, rotor lamination winding are analyzed. And how temperature influences performance is presented. Moreover, calculate air-gap length size MPMSSM discussed. MATLAB used design prototype. And, computer simulation results magnetic field shown by ANSOFT according its model. structure method this can be on common MPMSSM.

TMs paper presents a design method of multipolar line-start permanent magnet synchronous motor (PMSM) for gearless drive systems. The structures stator lamination, rotor lamination and windings are designed. And how temperature influences the performance is analyzed. Moreover, to calculate air-gap length size also discussed. MATLAB program used prototype. Finally, starting process simulated by ANSOFT according its model. By simulation, distribution change magnetic field presented.

This article proposes a torque optimization method that introduces the rotor magnetomotive force (MMF) harmonics, aiming to increase average without increasing cogging and ripple. A spoke type permanent magnet direct drive motor with fractional slot concentrated winding (FSCW) is designed. The FSCW can improve utilization rate of winding, but at same time, it brings wealth MMF harmonics. First, electromagnetic expression derived using principles magnetic energy virtual power. It means...

Abstract Compared with the single‐stator permanent magnet synchronous motor(SS‐PMSM), double‐stator motor(DS‐PMSM) can make full use of space in motor cavity to it have higher torque density, so is more suitable for direct‐drive occasions low‐speed and high‐torque. This paper aims design compare parameters performances DS‐PMSMs four different rotor structures: 1)Series magnetic circuit radial magnetised single‐layer magnet(type Ⅰ), 2)Series double‐layer Ⅱ), 3)Parallel Ⅲ), 4)Parallel...