请问如何使用ST7MC进行线性驱动控制？

大家好，
 
 
我们正在决定在我们的控制系统中使用ST7MC
带单相逆变器的线性驱动器。因为我不熟悉ST7MC
我无法估计ST7MC是否足够快速完成我们的任务
以下：
 
- 控制由电源侧的H桥控制的线性驱动器。
- 我们需要控制这个电机一个定位控制回路和一个
 电流控制回路。
- 用于位置识别的传感器由光学增量传感器组成
 光电屏障有2个轨道和一个额外的类似光学传感器
 对于索引轨道。
 两个轨道的总读入增量的数量一起对应于
 11位和增量边沿的频率约为55kHz。
 为了实现滑块或电枢的移动方向
 直线电机我们需要16位定时器的上/下反转功能
 与ST7MC的正交解码器功能连接。
 索引信号具有大约48Hz的频率。
- 电流传感器是一个分流电阻，用于测量直流母线电流
 进入逆变器。当前采样频率为4 kHz（固定时间片）
 分辨率为10位。用于切换H桥的电流的PWM频率
 应该高达16 kHz，以避免噪音问题（至少12kHz）。
 我们将使用内置的运算放大器来放大来自的电流信号
 分流电阻器。
 
- 通过中断服务程序至少同时运行3个进程
 1.增加读入/移动识别/向上/向下计数是并行工作
 到ST7MC。通过索引信号校正每个cyclus一次的计数器值。
 结果产生当前控件的设置值。
 2.在修复时间片中：通过AD转换读入当前值。
 计算控制值（比例积分结构）
 3.当前值在被调用的修复时间片中设置自动重载PWM-Timer。
 
- 另外我们仍然与PC主机进行异步通信（最低
 主循环中的优先级）
 
我仍然希望ST7MC足以完成所描述的任务。
或者在紧急情况下，循环中的时间值要考虑减少以便保持当前概念。
 
提前谢谢了。
 
hakl



以下为原文




hello to everybody,


we are standing for the decision to use the ST7MC in our control system for  
a linear drive with a one phase inverter. Because I am not familiar with the ST7MC  
I can not estimate whether the ST7MC is quick enough for our task like the  
following:  

- Controlling a linear drive which is controlled by a H-bridge on the power side.  
- We need for the controlling of this motor a positioning control-loop and a  
current control-loop.  
- The sensor for the position recognition consists of a optical incremental  
photoelectric barrier with 2 tracks and an additional similar optical sensor  
for a index track.  
The numbers of the total read-in increments of both tracks together correspond to  
11 bits and the frequency of the edges of the increments is approximately 55kHz.  
In order to realise the direction of moving of the slide or armature of the  
linear motor we need the up/down reversing function of the 16-bit-timer in  
connection with the quadrature decoder function of the ST7MC.  
The index signal has a frequency of approximately 48Hz.  
- The sensor for the current is a shunt resistor which measure the DC-link current  
into the inverter. The current sampling frequency is 4 kHz ( fix time slice ) with  
the resolution of 10 bit. The PWM-frequency of the current for switching the H-bridge  
should be up to 16 kHz in order to avoid noise problems ( at least 12kHz ).  
We will use the built-in operation amplifer for amplify the current signal from  
the shunt resistor.  

- At least 3 processes are running at the same time via interrupt service routines  
1. Increments read-in/moving recognition/up/down-counting is working parallel  
to the ST7MC. Correction of the counter value one time per cyclus via index-signal.  
Results yield the setting values for the current control.  
2. In a fix time slice: Current value read-in via AD-converting .  
Calculating the control value(Proportional Integral structure)  
3. Current value set the auto reload PWM-Timer in the called fix time slice.  

- Additional we have still a asynchronous communication with a PC-host (lowest  
priority in main loop)  

I still hope that the ST7MC is adequate for the described task.  
Or in the case of emergency which time values in the loops have I to consider to reduce in order to keep the present concept.  

Many thanks in advance.  

hakl