In and outs of high pole count outrunners and esc compatibility

[TotalPackage]

Started this thread to carry on conversation about motors like the t600 class outrunners.

[sailr]

What is your question? Most esc's can accommodate outrunners. Timing is generally set high for outrunners because they are high pole count motors. I generally run most of mine at 16-24 degrees and PWM at 8hz.

[keithbradley]

Bottom line, high pole count motors are a poor choice for high RPM applications. They become inefficient at high RPMs. Most escs are limited at around 320,000RPMs divide by that motors pole count. The motor itself can affect this equation positively or negatively.
Some ESC manufacturers will claim higher limits, but efficiency suffers so much that its really not applicable.

[Meniscus]

Bottom line, high pole count motors are a poor choice for high RPM applications. They become inefficient at high RPMs. Most escs are limited at around 320,000RPMs divide by that motors pole count. The motor itself can affect this equation positively or negatively.
Some ESC manufacturers will claim higher limits, but efficiency suffers so much that its really not applicable.

I have noticed some efficiency reductions with the higher RPM setups, however this is not true with all ESCs. In other words, on some ESCs, they really fly, on others, not so much. It seems to be very ESC specific.

[TotalPackage]

I have noticed some efficiency reductions with the higher RPM setups, however this is not true with all ESCs. In other words, on some ESCs, they really fly, on others, not so much. It seems to be very ESC specific.

Yes it definately depends on the design of the esc the processor and the rc circuit supplying the fet drivers

No questions Salir I just wanted to port this discussion off howards thread. So we can all talk here about outrunners.

[sailr]

Good idea.

[m4a1usr]

Another limitation to using certain outrunners is RPM. Due to construction you may not be able to use as you would an inrunner. Some outrunners simply cannot spin as fast. One of the most often seen issues as well is motor lead gauge. Even large outrunners rarely have 10ga or some even 12 ga leads. I remember a few posts last year about guys frying the wires off their big motors because they loaded them the same as the inrunner. They just arent designed the same.

John