BLDC电机控制在60000或更高RPM

再见
PRASHANT
 
 即使它不常见且没有经过如此多的测试，也可以将PWM输出的载波频率设置为100kHz。
 由于工作负载无法在每个PWM周期内执行FOC（使用STM32F4xx，FOC BEMF无传感器的最大执行频率为50kHz），但您可以设置系统每两个或三个PWM周期执行一次（两个应该提供最佳允许选项） ）。
 
 再见
 梁咏琪



以下为原文





Ciao
Prashant

Even if it is not usual and no so much tested, it is possible to set the carrier frequency of the PWM output to 100kHz.
Due to the workload is not possible to execute the FOC each PWM period (max execution frequency of FOC BEMF sensorless is 50kHz using STM32F4xx) but you can setup the system to execute it each two or three PWM periods (two should gives the best allowed option).

Ciao
Gigi

亲爱的吉吉，
 
 
 感谢您的回复。
 还有一个疑问，如果我们在2个PWM之后执行FOC（假设PWM频率为90Khz;因此FOC频率应为45 Khz），那么CPU负载应该是多少？
 
 谢谢
 PRASHANT



以下为原文






Dear Gigi,

  
Thanks for reply.
One more doubt, if we execute FOC after 2 PWM (assuming PWM frequency as 90Khz; so FOC frequency shall be 45 Khz), what shall be the CPU load?
  
Thanks
Prashant

嗨吉吉，
 
 
 还有一个问题就是你的答复。
 你是怎么到达50khz的FOC执行是可以实现的？
 您是否有任何应用说明或任何可以帮助我们理解FOC算法执行时序和CPU负载的证据。如果您可以分享这些信息，那将会非常有帮助。
 谢谢
 PRASHANT



以下为原文





Hi Gigi,


One more question on your reply.  
How did you arrive that 50khz FOC execution is achievable?
Do you have any application note or any evidence that can help us in understanding the FOC algorithm execution timings and CPU load. It would be of great help if you can share this information.
Thanks
Prashant

亲爱的Prashant，
50kHz FOC基于F4在大约10us内完成整个FOC +无传感器+ 3shunt电流读数的事实，并且该算法从PWM周期的中心开始。由此，您可以轻松地计算出50kHz的最大foc率。
另一方面，我们可以说 - 例如 - 如果FOC频率为10 kHz，则cpu负载为10％。
问候，
 
 迪诺
 
嗨吉吉，
 
 
 还有一个问题就是你的答复。
 你是怎么到达50khz的FOC执行是可以实现的？
 您是否有任何应用说明或任何可以帮助我们理解FOC算法执行时序和CPU负载的证据。如果您可以分享这些信息，那将会非常有帮助。
 谢谢
 PRASHANT



以下为原文






Dear Prashant,
the 50kHz FOC is based on the fact that F4 completes the whole FOC + sensorless + 3shunt current reading in about 10us, and that the algorithm starts from the center of the PWM period. From this, you can work out easily the max foc rate of 50kHz.
On the other hand, we can say - for instance - that if the FOC frequency is 10 kHz then the cpu load is 10%.
Regards,

Dino


Hi Gigi,


One more question on your reply.  
How did you arrive that 50khz FOC execution is achievable?
Do you have any application note or any evidence that can help us in understanding the FOC algorithm execution timings and CPU load. It would be of great help if you can share this information.
Thanks
Prashant

亲爱的Prashant，
 
 
 STM32F4在45kHz FOC时的CPU负载 - 90 kHz PWM将在50％左右
 
 问候，
 迪诺



以下为原文





Dear Prashant,


the CPU load of STM32F4 at 45kHz FOC - 90 kHz PWM will be around 50%

Regards,
Dino

嗨迪诺，
 
 
 非常感谢提示＆amp;信息反应。您已经提供了非常重要的信息，即3个分流器的无传感器FOC在10uS内执行。请告诉我们核心频率是多少？（我们假设它是180Mhz）如果您可以分享一些提供此信息的ST文档/ ST网络链接，那将是很好的;供我们参考。
 问候
 PRASHANT
 prashant.kharade@igate.com



以下为原文





Hi Dino,


Thanks a lot for prompt & informative response. You have given very important information that sensorless FOC with 3 shunts is executed in 10uS. Please let us know what is the core frequency?(We assume it to be 180Mhz) It will be nice if you could share some ST document/ST weblink where this information is given; for our reference.
Regards
Prashant
prashant.kharade@igate.com