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同步型交流伺服电动机虽较感应电动机复杂，但比直流电动机简单。它的定子与感应电动机一样，都在定子上装有对称三相绕组。而转子却不同，按不同的转子结构又分电磁式及非电磁式两大类。非电磁式又分为磁滞式、永磁式和反应式多种。其中磁滞式和反应式同步电动机存在效率低、功率因数较差、制造容量不大等缺点。数控机床中多用永磁式同步电动机。与电磁式相比，永磁式优点是结构简单、运行可靠、效率较高；缺点是体积大、启动特性欠佳。但永磁式同步电动机采用高剩磁感应，高矫顽力的稀土类磁铁后，可比直流电动外形尺寸约小1/2，质量减轻60﹪，转子惯量减到直流电动机的1/5。它与异步电动机相比，由于采用了永磁铁励磁，消除了励磁损耗及有关的杂散损耗，所以效率高。又因为没有电磁式同步电动机所需的集电环和电刷等，其机械可靠性与感应（异步）电动机相同，而功率因数却大大高于异步电动机，从而使永磁同步电动机的体积比异步电动机小些。这是因为在低速时，感应（异步）电动机由于功率因数低，输出同样的有功功率时，它的视在功率却要大得多，而电动机主要尺寸是据视在功率而定的。
在控制策略上，基于电机稳态数学模型的电压频率控制方法和开环磁通轨迹控制方法都难以达到良好的伺服特性，当前普遍应用的是基于永磁电机动态解耦数学模型的矢量控制方法，这是现代伺服系统的核心控制方法。虽然人们为了进一步提高控制特性和稳定性，提出了反馈线性化控制、滑模变结构控制、自适应控制等理论，还有不依赖数学模型的模糊控制和神经元网络控制方法，但是大多在矢量控制的基础上附加应用这些控制方法。还有，高性能伺服控制必须依赖高精度的转子位置反馈，人们一直希望取消这个环节，发展了无位置传感器技术(Sensorless Control)。至今，在商品化的产品中，采用无位置传感器技术只能达到大约1:100的调速比，可以用在一些低档的对位置和速度精度要求不高的伺服控制场合中，比如单纯追求快速起停和制动的缝纫机伺服控制，这个技术的高性能化还有很长的路要走。
伺服电机编码器是安装在伺服电机上用来测量磁极位置和伺服电机转角及转速的一种传感器，从物理介质的不同来分，伺服电机编码器可以分为光电编码器和磁电编码器，另外旋转变压器也算一种特殊的伺服编码器，市场上使用的基本上是光电编码器，不过磁电编码器作为后起之秀，有可靠，价格便宜，抗污染等特点，有赶超光电编码器的趋势。
伺服电机是指在伺服系统中控制机械元件运转的发动机，是一种补助马达间接变速装置。
伺服电机可使控制速度，位置精度非常准确，可以将电压信号转化为转矩和转速以驱动控制对象。伺服电机转子转速受输入信号控制，并能快速反应，在自动控制系统中，用作执行元件，且具有机电时间常数小、线性度高、始动电压等特性，可把所收到的电信号转换成电动机轴上的角位移或角速度输出。分为直流和交流伺服电动机两大类，其主要特点是，当信号电压为零时无自转现象，转速随着转矩的增加而匀速下降。
力士乐同步伺服电机MSK071C-0450-NN-S1-UG0-NNNN，德国REXROTH伺服电机；
德国力士乐REXROTH同步伺服电机订货号和型号：
R911343985 MSK071C-0200-NN-M1-AG1-NNAN
R911320472 MSK071C-0200-NN-M1-UG0-NNNN
R911321167 MSK071C-0200-NN-M1-UG0-NSNN
R911320336 MSK071C-0200-NN-M1-UG1-NNNN
R911337849 MSK071C-0200-NN-M1-UG1-NSNN
R911325654 MSK071C-0200-NN-M1-UG2-NNNN
R911327296 MSK071C-0200-NN-M1-UP0-NNNN
R911324006 MSK071C-0200-NN-M1-UP1-NNNN
R911373104 MSK071C-0200-NN-M1-UP2-NNNN
R911322616 MSK071C-0200-NN-M2-UG0-RNNN
R911323769 MSK071C-0200-NN-M2-UG1-RNNN
R911372668 MSK071C-0200-NN-M3-UG0-NNNN
R911371356 MSK071C-0200-NN-M3-UG1-NNNN
R911370781 MSK071C-0200-NN-M3-UP0-NNNN
R911317802 MSK071C-0200-NN-S1-UG0-NNNN
R911327530 MSK071C-0200-NN-S1-UG1-NNNN
R911379827 MSK071C-0200-NN-S1-UG2-NNNN
R911322620 MSK071C-0200-NN-S1-UP0-NNNN
R911335194 MSK071C-0200-NN-S1-UP1-NNNN
R911339680 MSK071C-0200-NN-S2-UG0-RNNN
R911329205 MSK071C-0200-NN-S2-UG1-RNNN
R911342060 MSK071C-0200-NN-S2-UP0-RNNN
R911344816 MSK071C-0200-NN-S3-UG0-NNNN
R911342647 MSK071C-0200-NN-S3-UP2-NNNN
R911334657 MSK071C-0300-NN-M1-AP0-NNAN
R911333548 MSK071C-0300-NN-M1-BG0-NNAN
R911369876 MSK071C-0300-NN-M1-BG2-NNAN
R911320885 MSK071C-0300-NN-M1-UG0-NNNN
R911318419 MSK071C-0300-NN-M1-UG1-NNNN
R911322703 MSK071C-0300-NN-M1-UG2-NNNN
R911327768 MSK071C-0300-NN-M1-UP0-NNNN
R911324104 MSK071C-0300-NN-M1-UP1-NNNN
R911330886 MSK071C-0300-NN-M2-UG0-RNNN
R911335569 MSK071C-0300-NN-M2-UG1-RNNN
R911344577 MSK071C-0300-NN-M2-UG2-RNNN
R911335722 MSK071C-0300-NN-M2-UP0-RNNN
R911324270 MSK071C-0300-NN-M2-UP1-RNNN
R911380400 MSK071C-0300-NN-M3-UG0-NNNN
R911340131 MSK071C-0300-NN-M3-UP1-NNNN
R911331022 MSK071C-0300-NN-S1-UG0-NNNN
R911382840 MSK071C-0300-NN-S1-UG0-NSNN
R911332432 MSK071C-0300-NN-S1-UG1-NNNN
R911319817 MSK071C-0300-NN-S1-UP0-NNNN
R911343032 MSK071C-0300-NN-S1-UP1-NNNN
R911347172 MSK071C-0300-NN-S2-UG0-RNNN
R911376518 MSK071C-0300-NN-S2-UG1-RNNN
R911345666 MSK071C-0300-NN-S3-UG0-NNNN
R911382714 MSK071C-0300-NN-S3-UG1-NNNN
R911335606 MSK071C-0300-NN-S3-UP0-NNNN
R911337635 MSK071C-0302-NN-S1-UG0-NNNN
R911384261 MSK071C-0450-NN-M1-AG1-NNAN
R911325569 MSK071C-0450-NN-M1-AG2-NNAN
R911320698 MSK071C-0450-NN-M1-UG0-NNNN
R911316155 MSK071C-0450-NN-M1-UG1-NNNN
R911319178 MSK071C-0450-NN-M1-UG2-NNNN
R911319229 MSK071C-0450-NN-M1-UP0-NNNN
R911372256 MSK071C-0450-NN-M1-UP0-NSNN
R911321455 MSK071C-0450-NN-M1-UP1-NNNN
R911326402 MSK071C-0450-NN-M1-UP1-NSNN
R911328823 MSK071C-0450-NN-M1-UP2-NNNN
R911338404 MSK071C-0450-NN-M2-UG0-RNNN
R911329765 MSK071C-0450-NN-M2-UG1-RNNN
R911332295 MSK071C-0450-NN-M2-UP0-RNNN
R911321378 MSK071C-0450-NN-M2-UP1-RNNN
R911342526 MSK071C-0450-NN-M3-UG0-NNNN
R911340121 MSK071C-0450-NN-M3-UP0-NNNN
R911340122 MSK071C-0450-NN-M3-UP1-NNNN
R911322373 MSK071C-0450-NN-S1-UG0-NNNN
R911386819 MSK071C-0450-NN-S1-UG0-NSNN
R911315850 MSK071C-0450-NN-S1-UG1-NNNN
R911320812 MSK071C-0450-NN-S1-UP0-NNNN
R911334418 MSK071C-0450-NN-S1-UP1-NNNN
R911370450 MSK071C-0450-NN-S2-UP1-RNNN
R911342527 MSK071C-0450-NN-S3-UG0-NNNN
R911370485 MSK071C-0450-NN-S3-UP0-NNNN
R911307187 MSK071C-0600-NN-S1-UG0-NNNN
R911307188 MSK071C-0600-NN-S1-UG1-NNNN
R911312867 MSK071D-0200-NN-M1-UG0-NNNN
R911333463 MSK071D-0200-NN-M1-UG1-NN04
R911312356 MSK071D-0200-NN-M1-UG1-NNNN
R911315707 MSK071D-0200-NN-M1-UG2-NNNN
R911336446 MSK071D-0200-NN-M1-UK0-NV02
R911317325 MSK071D-0200-NN-M1-UP0-NNNN
R911320234 MSK071D-0200-NN-M1-UP1-NNNN
R911328822 MSK071D-0200-NN-M1-UP2-NNNN
R911317150 MSK071D-0200-NN-M2-UG0-RNNN
R911321967 MSK071D-0200-NN-M2-UG1-RNNN
R911317838 MSK071D-0200-NN-M2-UP0-RNNN
R911322708 MSK071D-0200-NN-M2-UP1-RNNN
R911382654 MSK071D-0200-NN-M3-UG1-NNNN
R911316883 MSK071D-0200-NN-S1-UG0-NNNN
R911387060 MSK071D-0200-NN-S1-UG0-NSNN
R911322469 MSK071D-0200-NN-S1-UG1-NNNN
R911325915 MSK071D-0200-NN-S1-UG2-NNNN
R911311046 MSK071D-0200-NN-S1-UP0-NNNN
R911312800 MSK071D-0200-NN-S1-UP1-NNNN
R911317706 MSK071D-0200-NN-S2-UG0-RNNN
R911332878 MSK071D-0200-NN-S2-UG1-RNNN
R911381062 MSK071D-0200-NN-S2-UP0-RNNN
R911371389 MSK071D-0200-NN-S3-UG0-NNNN
R911330622 MSK071D-0202-NN-S3-UG0-NPNN
R911310539 MSK071D-0300-NN-M1-UG0-NNNN
R911333464 MSK071D-0300-NN-M1-UG1-NN04
R911310168 MSK071D-0300-NN-M1-UG1-NNNN
R911337718 MSK071D-0300-NN-M1-UG1-NSNN
R911313741 MSK071D-0300-NN-M1-UG2-NNNN
R911338510 MSK071D-0300-NN-M1-UP0-NNBN
R911310859 MSK071D-0300-NN-M1-UP0-NNNN
R911331372 MSK071D-0300-NN-M1-UP0-NSNN
R911317342 MSK071D-0300-NN-M1-UP1-NNNN
R911318876 MSK071D-0300-NN-M1-UP2-NNNN
R911338797 MSK071D-0300-NN-M1-AG0-NNAN
R911325571 MSK071D-0300-NN-M1-AG2-NNAN
R911382731 MSK071D-0300-NN-M1-BG0-NNAN
R911315191 MSK071D-0300-NN-M2-UG0-RNNN
R911326960 MSK071D-0300-NN-M2-UG0-RNNN
R911326890 MSK071D-0300-NN-M2-UG0-RSNN
R911322131 MSK071D-0300-NN-M2-UG1-RNNN
R911333157 MSK071D-0300-NN-M2-UG2-RNNN
R911317818 MSK071D-0300-NN-M2-UP0-RNNN
R911343220 MSK071D-0300-NN-M2-UP1-RNNN
R911317819 MSK071D-0300-NN-M2-UP2-RNNN
R911321168 MSK071D-0300-NN-M2-UP2-RSNN
R911342509 MSK071D-0300-NN-M3-UG0-NNNN
R911329077 MSK071D-0300-NN-M3-UG1-NNNN
R911340127 MSK071D-0300-NN-M3-UP1-NNNN
R911346251 MSK071D-0300-NN-S1-BP1-NNAN
R911306141 MSK071D-0300-NN-S1-UG0-NNNN
R911326158 MSK071D-0300-NN-S1-UG0-NPNN
R911332872 MSK071D-0300-NN-S1-UG0-NSNN
R911310722 MSK071D-0300-NN-S1-UG1-NNNN
R911325635 MSK071D-0300-NN-S1-UG2-NNNN
R911311929 MSK071D-0300-NN-S1-UP0-NNNN
R911318310 MSK071D-0300-NN-S1-UP1-NNNN
R911329200 MSK071D-0300-NN-S2-AG1-RNAN
R911317432 MSK071D-0300-NN-S2-UG0-RNNN
R911325541 MSK071D-0300-NN-S2-UG1-RNNN
R911317816 MSK071D-0300-NN-S2-UP0-RNNN
R911317817 MSK071D-0300-NN-S2-UP2-RNNN
R911345336 MSK071D-0300-NN-S3-UG0-NNNN
R911329202 MSK071D-0300-NN-S3-UG0-NPNN
R911346441 MSK071D-0300-NN-S3-UP0-NNNN
R911342649 MSK071D-0450-NN-M1-AG1-NNAN
R911343062 MSK071D-0450-NN-M1-BG1-NNAN
R911309393 MSK071D-0450-NN-M1-UG0-NNNN
R911308717 MSK071D-0450-NN-M1-UG1-NNNN
R911317009 MSK071D-0450-NN-M1-UG2-NNNN
R911312347 MSK071D-0450-NN-M1-UP0-NNNN
R911311533 MSK071D-0450-NN-M1-UP1-NNNN
R911326403 MSK071D-0450-NN-M1-UP1-NSNN
R911312348 MSK071D-0450-NN-M1-UP2-NNNN
R911343343 MSK071D-0450-NN-M1-UP2-NSNN
R911311845 MSK071D-0450-NN-M2-UG0-RNNN
R911325414 MSK071D-0450-NN-M2-UG1-RNNN
R911341750 MSK071D-0450-NN-M2-UG2-RNNN
R911329688 MSK071D-0450-NN-M2-UP0-RNNN
R911338884 MSK071D-0450-NN-M2-UP1-RNNN
R911338912 MSK071D-0450-NN-M3-UG0-NNNN
R911379503 MSK071D-0450-NN-M3-UP0-NNNN
R911324062 MSK071D-0450-NN-S1-BG0-NNAN
R911307189 MSK071D-0450-NN-S1-UG0-NNNN
R911386820 MSK071D-0450-NN-S1-UG0-NSNN
R911307190 MSK071D-0450-NN-S1-UG1-NNNN
R911308360 MSK071D-0450-NN-S1-UG2-NNNN
R911311030 MSK071D-0450-NN-S1-UP0-NNNN
R911321550 MSK071D-0450-NN-S1-UP1-NNNN
R911322173 MSK071D-0450-NN-S1-UP2-NNNN
R911308345 MSK071D-0450-NN-S2-UG0-RNNN
R911308347 MSK071D-0450-NN-S2-UG1-RNNN
R911308349 MSK071D-0450-NN-S2-UG2-RNNN
R911313911 MSK071D-0450-NN-S2-UP0-RNNN
R911318240 MSK071D-0450-NN-S2-UP2-RNNN
R911333543 MSK071D-0450-NN-S3-UP0-NNNN
R911332089 MSK071E-0200-NN-M1-AG0-NNAN
R911347907 MSK071E-0200-NN-M1-AG2-NNAN
R911343986 MSK071E-0200-NN-M1-BG1-NNAN
R911343988 MSK071E-0200-NN-M1-BG2-NNAN
R911315711 MSK071E-0200-NN-M1-UG0-NNNN
R911315851 MSK071E-0200-NN-M1-UG1-NNNN
R911318834 MSK071E-0200-NN-M1-UG2-NNNN
R911330641 MSK071E-0200-NN-M1-UK0-NV02
R911317855 MSK071E-0200-NN-M1-UP0-NNNN
R911315897 MSK071E-0200-NN-M1-UP1-NNNN
R911315643 MSK071E-0200-NN-M1-UP2-NNNN
R911373798 MSK071E-0200-NN-M1-UP2-NSNN
R911312468 MSK071E-0200-NN-M2-UG0-RNNN
R911312469 MSK071E-0200-NN-M2-UG1-RNNN
R911331708 MSK071E-0200-NN-M2-UG2-RNNN
R911332466 MSK071E-0200-NN-M2-UP1-RNNN
R911335684 MSK071E-0200-NN-M2-UP2-RNNN
R911372833 MSK071E-0200-NN-M3-AG0-NNAN
R911374272 MSK071E-0200-NN-M3-UG0-NNNN
R911311560 MSK071E-0200-NN-S1-UG0-NNNN
R911311561 MSK071E-0200-NN-S1-UG1-NNNN
R911321169 MSK071E-0200-NN-S1-UG1-NSNN
R911322666 MSK071E-0200-NN-S1-UG2-NNNN
R911315342 MSK071E-0200-NN-S1-UP0-NNNN
R911329925 MSK071E-0200-NN-S1-UP1-NNNN
R911330515 MSK071E-0200-NN-S1-UP2-NNNN
R911321732 MSK071E-0200-NN-S2-UG0-RNNN
R911382217 MSK071E-0200-NN-S2-UG1-RNNN
R911305095 MSK071E-0200-NN-S2-UG2-RNNN
R911336849 MSK071E-0200-NN-S2-UP0-RNNN
R911341081 MSK071E-0200-NN-S2-UP1-RNNN
R911329378 MSK071E-0200-NN-S3-UG0-NNNN
R911342357 MSK071E-0200-NN-S3-UP0-NNNN
R911343945 MSK071E-0300-NN-M1-AG2-NNAN
R911375131 MSK071E-0300-NN-M1-AP2-NNAN
R911378037 MSK071E-0300-NN-M1-BG1-NNAN
R911310096 MSK071E-0300-NN-M1-UG0-NNNN
R911308891 MSK071E-0300-NN-M1-UG1-NNNN
R911309394 MSK071E-0300-NN-M1-UG1-NNNN
伺服电机可以理解为服从控制信号指挥的电机：在控制信号发出之前，转子静止不动；当控制信号发出时，转子立即转动；当控制信号消失时，转子能即时停转。伺服电机是自动控制装置中被用作执行元件的微特电机，其功能是将电信号转换成转轴的角位移或角速度。
机器人用伺服电机要求控制器与伺服之间的总线通讯速度快；伺服的精度高；另外对基础材料有加工要求。特别是像机器人末端执行器（手爪）应采用体积、质量尽可能小的电机，尤其是要求快速响应时，伺服电动机必须具有较高的可靠性和稳定性，能经受得起苛刻的运行条件，可进行十分频繁的正反向和加减速运行，并能在短时间内承受过载。
伺服电机分为交流伺服和直流伺服两大类，交流伺服电机的基本构造与交流感应电动机（异步电机）相似。在定子上有两个相空间位移90°电角度的励磁绕组Wf和控制绕组WcoWf，接恒定交流电压，利用施加到Wc上的交流电压或相位的变化，达到控制电机运行的目的。交流伺服电机具有运行稳定、可控性好、响应快速、灵敏度高以及机械特性和调节特性的非线性度指标严格（要求分别小于10％～15％和小于15％～25％）等特点。
直流伺服电机基本构造与一般直流电动机相似。电机转速n＝E／K1j＝（Ua－IaRa）／K1j，式中E为电枢反电动势，K为常数，j为每极磁通，Ua、Ia为电枢电压和电枢电流，Ra为电枢电阻，改变Ua或改变φ，均可控制直流伺服电动机的转速，但一般采用控制电枢电压的方法，在永磁式直流伺服电动机中，励磁绕组被磁铁所取代，磁通φ恒定。直流伺服电动机具有良好的线性调节特性及快速的时间响应。
工业机器人的控制系统和自动化产品主要涉及伺服电机、减速机、控制器和传感器等。伺服电机是工业机器人的动力系统。
目前，机器人的关节驱动离不开伺服系统，关节越多，机器人的柔性和度越高，所要使用的伺服电机的数量就越多。机器人对伺服系统的要求较高，必须满足快速响应、高起动转矩、动转矩惯量比大、调速范围宽，要适应机器人的形体做到体积小、重量轻、加减速运行等条件，且需要高可靠性和稳定性。目前，工业机器人使用的较多的是交流伺服系统。
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