dq全数字化双闭环可逆直流pwm调速系统的研究dwg中英文翻译

1、直流电机脉冲宽度调制(Pulse Width Modwed-简称)调速系统产生于 70 年代中期.最早用于不可逆、小功率驱动,例如自动天文望远镜、自动仪表等 。近十多年来,由于晶体管器件水平的提高及电路 技术的发展,同时又因出现了宽调速永磁直流电机, 它们之间的结合促使使电气驱动技术推进到一个新的高度.技术的高速发展,并在国外,最早是在军事工业以及空间技术中应用。它以优越的性能,满足那些高速度、高精度随动系统的需求。近年来,进一步扩散到民用工业,特别是在机床行业、自动生产线及机器人等领域中广泛应用。可以这样说,六十年代中期发展起来的晶体管 OTL 电路、OCL 电路,特别是桥型无变压器输出的B

2、TL 电路,为系统的发展奠定了电路基础,而各种先进的功率器件(如GTR,提供了良好的条件。系统的特点模块等)及宽调速直流电机的出现,更为技术的应用开关损耗小,变流器效率高。系统主回路电源是经过整流及大容量电容器虑波后供电,因而不会因电网电压波形的失真而影响调节质量。以 1KHZ-8KHZ 的高频脉冲电流给电机的电枢供电,由于是感性负载,脉冲电流得以滤平,所以波系数小,电机发热量小,可以减小机械变形,从而能提高工作机械的精度。也正是由于波形系数小,电机利用率高,从相同发热量的角度考虑,系统获得可以比 SCR 系统高 1.3-1.8 倍的转矩,因此系统可以选用较小容量的电机.特别是工作在正反转频繁

3、的伺服系统中,其优点尤为突出。系统的响应频带很宽,可达到 100-200HZ 以上。因此起制动非常快,而且超调量小,可以大大提高高冲击率机械的生产效率。因系统采样频率高,频带宽,所以抗负载扰动的性能好,动态速度下降小,恢复时间快,因此动态硬度好,加工零件表面光洁度高。6)同样由于采样频率高,避开了电机及传械的点,所以运动平稳,这也是提高加工光洁度的一个有利。7)系统很容易地实现四象限运行。当用于 2 千瓦以下的电机时,在再生制动的情况下,再生的能量可在功率电容器中,2 千瓦以上的电机,再采用特殊电子线路,让能量馈送到再生负载电阻上去,以加快制动过程,并防止电子元件因过压而造成损坏。8)系统调速

4、范围宽,最低速度可达到 1 转/24 小时。这特别适用于自动系统。例如监测站的地磁变化曲线的等。而在机床伺服驱动系统中应用时,1 转/分钟即够用系统的最低速度实际取决于速度调节器的零点飘移量、速度给定电压的精度与分辩率、以及测速电机的纹波系数和电的波动力矩等。从9)有于伺服单元本身看,其潜力是很大的。本身性能的优越,因此不必象SCR 系统那样,为了提高系统性能而费尽心机,添加了许多环节,增加了系统的复杂性。例如各种滤波环节、电抗器之类的惯性环节、电流自适应环节以及函数发生器环节等等。使驱动系统的结构更加简单可靠,调整于应性。都十分方便。同时对个种参数不同的直流电机均有很好的适The direc

5、t current machine pulse width modulation (Pulse Width Modwed- is called) to modulate velocity the system to produce in the 70sermediate stagesUses in mostearly irreversiblily, the lower actuation,For exself-registering instrument and so on. Nearly morele automatic tracking trackingescope,n ten for y

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7、trical actuation technology to advance newly to highlyIn overseas,superior performanis most early apps in war industry as well as the spatial technology. It byatisfies these high velocity, the high accuracy follow-up tracking systemdemand. Nearly eight, for nine years,Further proliferates to the con

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10、efficiency is high.the systematic host ring current is ponders the wave after the rectification and the large capacitycapacitor to supplyer,Thus cannot but affect the adjustment quality because of the electricalnetwork voltage waveform distortion.3) gives the electrical machinery by the 1KHZ-8KHZ hi

11、gh frequency pulse electric current thearmatureer supply,Because is the perceptual load,The pulse electric current can filterevenly,Therefore the wave coefficient is small,The electrical machinery calorific capacity is small,May reduce the machinery distortion,Thus can enhance the work machinery the

12、 preci.Also is precisely because the wave form factor is small,The electrical machinery use factor ishigh,Considered from the same calorific capacity angle,Thesystem be highern 1.3-1.8 time of torque,Therefore thesystem obtains may SCR system may select thethe frequent servosystem,Itslow-er electric

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14、e system s ling frequency is high,Band width,Therefore the anti- loadperturbation performance is good,The dynamic speed drops slightly,Restores the time to bequick,Therefore the dynamic degree of hardness is good,Prosing components superfillyattractive fineness is high.6) similarly because the sling

15、 frequency is high,Has avoided the electrical machinery and thegearing resonance po,Therefore the movement is steady,This also is enhansmooth finish a favorable factor.the prosing7) thesystem very easily realizes four quadrants movements. When uses in 2 kilowattbelow electrical machinery,In electric

16、 regenerative braking situation,The regeneration energy maystore up in theer capacitor,2 kilowatt above electrical machinery,Again uses the spelelectronic circuit,Let the energy present to the regeneration loadcomes up,By speeds upapps the brake the prothe damage.s,And prevents the electronic compon

17、ent because to press breates8) thesystem velocity modulation scope is wide,Minimum speed may amount to for 1revolution of /24 hour. This iitable spelly for the automatic recording system. For exleearthquake inspection sion magnetic variation curve record and so on. But when engine bedservo drive sys

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