英语翻译Great progress has been made in batteries in recent year

英语翻译
Great progress has been made in batteries in recent years.However,the time has come for achange in emphasis.Previously the pure battery electric was seen as the desired solution.Even ifthe remaining technical issues can be addressed,we are still impeded by weight and cost of sucha solution.Consequently Polaron believe they should focus on hybrid solutions and this needsbatteries optimized for peak power not energy capacity.It requires batteries with geometries
optimized for peak power – ultra-low internal resistance and perhaps high capacitance at the sametime.It will certainly require new packaging.A capacity of 2 kWh at 2 minute rate would beadequate for the average family car.It will also require a low cost short-circuit device to bypasshigh resistance cells in long series strings.
There is now little doubt that brushless DC machines offer the best overall performance whenused in vector control mode,with high voltage windings,Fig.3.6.The reason is that the brushlessDC motor offers the lowest winding current for the overall envelope of operation.An electricvehicle has to provide a non-linear torque/speed curve with constant power operation from basespeed to maximum speed.In a brushless DC motor,the motor voltage may be held constant
over this range using vector control.In an induction motor,the motor voltage must rise over theconstant power speed range.If V and I are the voltage and current at maximum speed and powerthe values at base speed are V ´ (Base Speed/Max Speed)1/2,I ´ (Max Speed/Base Speed)1/2.Ifmaximum speed / base speed = 3.5 times,the current at base speed is 1.87I.Consequently theinduction motor inverter requires 1.87 times the current capacity of the brushless DC motorinverter.
The most significant improvement recently for brushless DC machines has been the
development of the Daido magnet tube in Magnaquench material.This product offers the benefitsof high energy magnet and containment tube.This leads to a third benefit which is not immediatelyobvious but very significant.Surface magnet motors usually employ a containment sleeve whichadds several millimetres of air gap to the magnetic circuit.Since magnet tube does not requirea sleeve if used within its speed capability,a thinner magnet tube is possible whilst maintaining

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英文：Great progress has been made in batteries in recent years.However,the time has come for achange in emphasis.Previously the pure battery electric was seen as the desired solution.Even ifthe remaining technical issues can be addressed,we are still impeded by weight and cost of sucha solution.Consequently Polaron believe they should focus on hybrid solutions and this needsbatteries optimized for peak power not energy capacity.It requires batteries with geometriesoptimized for peak power – ultra-low internal resistance and perhaps high capacitance at the sametime.It will certainly require new packaging.A capacity of 2 kWh at 2 minute rate would beadequate for the average family car.It will also require a low cost short-circuit device to bypasshigh resistance cells in long series strings.There is now little doubt that brushless DC machines offer the best overall performance whenused in vector control mode,with high voltage windings,Fig.3.6.The reason is that the brushlessDC motor offers the lowest winding current for the overall envelope of operation.An electricvehicle has to provide a non-linear torque/speed curve with constant power operation from basespeed to maximum speed.In a brushless DC motor,the motor voltage may be held constantover this range using vector control.In an induction motor,the motor voltage must rise over theconstant power speed range.If V and I are the voltage and current at maximum speed and powerthe values at base speed are V ´ (Base Speed/Max Speed)1/2,I ´ (Max Speed/Base Speed)1/2.Ifmaximum speed / base speed = 3.5 times,the current at base speed is 1.87I.Consequently theinduction motor inverter requires 1.87 times the current capacity of the brushless DC motorinverter.The most significant improvement recently for brushless DC machines has been thedevelopment of the Daido magnet tube in Magnaquench material.This product offers the benefitsof high energy magnet and containment tube.This leads to a third benefit which is not immediatelyobvious but very significant.Surface magnet motors usually employ a containment sleeve whichadds several millimetres of air gap to the magnetic circuit.Since magnet tube does not requirea sleeve if used within its speed capability,a thinner magnet tube is possible whilst maintaining
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中文翻译：近年来有了长足的进步在电池.然而,时间已经改变的重点.以前的纯电池电动被视为理想的解决方案.即使剩下的技术问题可以解决,我们仍然被重量和成本阻碍了这样的解决方案.因此极化子相信他们应该专注于混合动力解决方案,这needsbatteries峰值功率不能容量优化.它需要电池geometriesoptimized峰值功率–超低内阻也许高电容的同时.它肯定需要新的包装.在2分钟的速率的2千瓦时的能力将beadequate为普通家庭用车.它还将一个低成本的短路装置需要bypasshigh耐药细胞在长序列的字符串.现在毫无疑问,无刷直流电机提供最佳的整体性能,用于矢量控制方式,具有高电压绕组,如图3.6所示.原因是,brushlessdc电机提供最低的绕组电流运行的整体信封.一种电动汽车已经提供一种恒功率运行的基本速度到最大速度的非线性扭矩/速度曲线.在无刷直流电机,电机的电压可能会constantover这个范围内采用的矢量控制.在感应电机,电机的恒功率速度范围的电压必须在上升.如果V和我是电压和最大速度和在基值电流、速度V´（基本速度/最大速度）1/2,我´（最大速度/速度）1/ 2.ifmaximum速度/速度=3.5倍,在基速电流1.87i.因此感应电机逆变器要求的无刷直流motorinverter电流容量的1.87倍.最显着的改善无刷直流电机最近一直在magnaquench大同磁管材料的发展.本产品可提供高能量磁铁和遏制管.这导致了三分之一的收益不immediatelyobvious但很重要的.表面磁电机通常采用一个密封套增加气隙的磁电路几毫米.因为如果在它的速度能力,用磁管不需要套,薄磁管可能同时保持
来自：百度翻译