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2012/2/29
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今天早上美國卡斯特有回應有關電變的設定.我正在看,600/700應可以再細部微調設定有關馬達工作頻率 PWM rate 部分.亞拓的設定是建議 PWM 為 Outrunner Mode,這模式是由馬達啟動時跟電變進行溝通來取得適合的工作頻率.但往往由馬達自行跟電變溝通都會大於 12Khz.而卡斯特則建議 600EFL Pro 設12Khz, 700 設 8Khz. 這樣馬達工作會更有效率.
PWM Rate 12Khz. 代表每秒電變觸發馬達 on/off 的次數為 12000 次.譬如,如果油門50%,代表每秒有6000次 On, 6000次off.但過高的 PWM Rate, 不會增加馬達功率.只會讓馬達過熱.而這次 CC4.0 更新也有一項是在固定PWM Rate (如 12Khz),在全油門輸出下的定速模式,會提高電變的輸出功率.
以下為Castle的回信.
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Louis, thanks very much for your email...
The file you are referring to is purely my personal preference that I have shared... there are many ways to run the ESC's of course and the beauty is that you can tune it to your liking. I added my settings as a good starting point for a known good setup to help make it easy for someone to get a setup flying great right off the table.
As for your question about out-runner mode ...
I have never preferred to run Out-runner mode on my Helis... I usually go with 8 or 12 kHz... Out-runner is okay on many setups but not my preference.
Here is an explanation of Out-Runner Mode that I copied from a thread by Patrick del Castillo...
The PWM frequency, in general, is how many times per second the speed control turns on/off during partial throttle. The on time vs the off time is what determines the throttle itself, but the frequency at which the cycle repeats is the PWM frequency. So, at 12 kHz, the speed control will turn on and off 12,000 times per second.
Outrunner mode is a special type of PWM frequency made especially for motor that commutate (change powered phases) very fast. In general, outrunners. The commutation frequency of outrunner motors is often well above 12 kHz, so this mode PWMs in synch with the commutation cycle. At the beginning, when the motor is spinning slowly, it will PWM at 6 kHz but as the motor goes above this level it will start to increase PWM frequency along with the motor's RPM.
The effect on motors that do not achieve these speeds is simple, it will just be a constant 6kHz PWM frequency.
I hope this information is helpful...
另外, 我也問了,如果 PWM Rate 設定過高會提高動力嗎? 答案是否定的,只會讓馬達更熱而已.
以下是 Castle 的回答.
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You will likely cause excessive heat with no power gain... In gov mode the motor spins at the Rpm it is set to....
根據 Castle 建議. 600級 PWM 頻率是 12KHz, 700 級是 8KHz.
[ 本帖最後由 lliu0130 於 2012-4-5 10:52 編輯 ] |
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