L6235 BLDC电机驱动器出现问题

嗨，
 
 
我用的是L6235无刷电机驱动器。我有控制微电机速度的问题。我在Vref引脚中实现PWM，然后连接到运算放大器和转速计输入。（正如Vincenzo Marano在应用笔记中所述）。我改变了PWM周期，但电机的速度没有变化。
 
怎样才能改变电机的速度？
 
还有一些加热问题。有没有人帮我...
 
事先提前
 
杰拉勒



以下为原文




Hi,


I use L6235 brushless motor driver. I have a problem about controlling speed of my micro motor. I implement PWM in the Vref pin which before connected to an opamp and the tacho input.( as Vincenzo Marano explains in application note). I change PWM cycle but the speed of the motor doesn't change.  

How can I change the speed of motor ?  

And also some heating problem. Is there anyone to help me...  

Thnks in advance  

Celal

你好，
 
 
你应该按照预期检查VREF引脚电压是否随PWM变化;如AN中所解释的，PWM和VREF之间的关系取决于低通滤波器设计。
您必须检查当前控制是否也正常工作。
 
关于加热问题，相电流和电源电压值是多少？什么是设备包？
使用功率器件作为L6235的系统必须从功耗角度进行小心设计（参见电源管理段落）。
 
如果您可以发布更多信息，我们可以尝试解决问题。
 
问候，
恩里科波利
应用工程师 - 电机控制组



以下为原文




Hello,


you should check if VREF pin voltage varies with PWM as expected; as explained in AN, relation between PWM and VREF depends on low pass filter design.  
You have to check if current control is properly working too.  

Concerning heating problem, what are phase current and supply voltage values? What is the device package?  
Systems using power devices as L6235 have to be careffuly designed from the power dissipation point of view (see power management paragraph).  

If you could post more information we can try to solve the issue.  

Regards,  
Enrico Poli  
Application Engineer - Motor control group