综合位置测量单位步进

1、Novel integrated position measurement unit for stepping motor servo control1. IntroductionRotor position detection is important for servo system. Researchers have investigated many sensorless position detection techniques for double salient motors such as stepping motor, SRM or PMSM. The fundamental

2、 principle of these sensorless techniques is that, rotor position information can be extracted from the stator circuit measure-ments or their derived parameters such as the back EMF the winding inductance, and the ux linkage . Because of the back EMF is in proportion to speed, it can not be used at

3、standstill and low speed. Lyons proposed a technique for SRM that utilized the relationship between ux linkage and current. The method can be applied even if no non-energized phase winding is present. But the accuracy is dependent on the precise measurement of stator poles, the testing coils have fu

4、ll magnetic connection with the windings of stator, the electronic and magnetic situation of the stator windings will badly affect the sensor coils. It makes the process of signal processing to be more complex and also inuence the precision. In this paper, a new integrated position feedback unit” fo

5、r hybrid stepping motor is proposed.2. Structure of the sensorThis sensor is just produced with the motor, and has the same structure with the motor. The sensor has no electronic and less magnetic connection with the motor. The sensor is easy to manufacture and has better precision with easier signa

6、l processing circuit. The motor is a 2-phase 8-pole hybrid stepping motor that has 50 teeth on the rotor. The sensor is double salient structure, has its own stator, rotor and stator windings (testing coils); just like a small single stack 2-phase VR stepping motor. The sensors stator is aligned wit

7、h the motors stator, and its rotor is aligned with one stack of the hybrid stepping motors rotor (unaligned with the other stack). The inductance of the testing coil is the function of the rotor position. So the motors rotor position can be detected by measuring the inductance on-line. This sensor n

8、ot only for the stepping motor, but also can produced with other types of motors as a general used position sensor for servo system. The testing coils are connected to make four testing windings as the left one. Each testing winding includes two testing coils that anti-connected each other. This con

9、nection method can greatly decreases the back-EMF signal in the testing coils that produced by the magnetic couple. There is an aluminum ring between the motors rotor and the sensors rotor that making the magnetic connection between motor and sensor is very little. The structure of the sensor makes

10、it possible and easier to detect the rotor position signal.6. ConclusionsThe integrated sensor increases the length and weight of the motor, but the system is still simpler and cheaper than the position sensors used now. This type of position signal detection method has more complex mechanism than t

11、he sensorless methods. But the signal processing process is simpler and the precision is higher, and the rotor position can be detected anytime without influence of the motors situation. The integrated sensor also can be produced independent and as a normal position sensor for all kinds of rotating

12、machines. With the help of the signal processing hardware and software, this kind of sensor can give out high precision.综合位置测量单位步进电机伺服控制1。介绍转子位置检测是一种重要的伺服系统。研究人员就已经在研究许多无固定位置传感器技术用于检测双凸极电机，比如步进马达,SRM或新型的永磁同步电机。这些传感器的基本原理是,转子位置信息可以从定子测量数据或像反电动势弯曲电感和磁通匝连数那些导出的参数中获取。由于反电动势与速度是成比例的,所以它不能用于停止和制动。里昂的一种方法,

13、提出了利用电流和磁链的关系。即使没有励磁绕组此方法也可应用。但其准确性依赖精确的测量定子极点,测试线圈有充分的磁性与定子绕组作用,定子绕组的电磁场情况将很严重的影响传感器线圈。它使信号处理过程更复杂、也影响精度。此文提出一种新的“集成位置反馈单元”混合式步进电机。2。传感器的非线性结构这个传感器类似一个电机,并且与电机有相同的结构。该传感器没有电子原件而且和电机很少有磁性相连。这个传感器容易制造,并具有更高精度的信号处理电路。电机是一种二段式8极混合式步进电机,转子上有50个齿。传感器是双凸结构,有自己的电机定子、转子和定子绕组线圈(测试线圈),就像一个小单堆栈二段式虚拟现实的步进电机。传感器的定子对准电机定子,其转子总是和混合式步进电机转子的一个堆栈对齐(与其他堆栈不对齐)。测试线圈的感应系数对转子位置起作用。所以电机转子位置可以通过测量即时电感得到。这个传感器不仅用在步进电机上,而且可以由其他类型的电机制作，作为一种普遍传感器测量伺服系统。测试线圈把四个测试绕组线圈连成一条。每个测试绕组包括两个与每一个反接的测试线圈。 这个连接技术可有效降低在测试绕组中由磁力偶产生的反接信号。电机转子和传感器转子之间有一个铝环,它让电机和传