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02-09-2008 06:26 PM  10 years agoPost 21
DMShanks

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Salt Lake City, UT

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Good data Mike, so the motor basically wants to spin at a specific speed, based on the voltage. I was haveing trouble initially with my Hornet as I couldnt tell the difference between non-gov. and Gov. mode. I wasn't sure one way or the other. It appeared the head speed was locked in pretty darned good in normal mode. Your comment would explain this. Would the motor, if suddenly onloaded (stripped drive gears) jump up in RPM in Gov. mode, or stay at the RPM directed by the throttle curve? Surely in non-Gov. mode the motor would scream and exceed any safe RPM.

Dave

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02-10-2008 02:28 AM  10 years agoPost 22
mikeflyz

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Westlake Village, CA

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The governor modes on most ESCs maintain lower rpms as compared to throttle modes. The Phoenix controller's have some adjustment in this regard, but many others don't. The why is never stated but an educated guess is so there is ample room designed between the speed ceiling and the governor setting so it maintains constant rpms first.

A governor also only responds to changes in rpm and can't anticipate them that result from changes of pitch. Governors on glow engines are much more useful since a glow engine is kinda "spongy" requiring more throttle manipulation, whereas an electric motor is more "torquey" and somewhat less affected by pitch changes.

Mike
MA Fury Extreme, JetCopter SX

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02-10-2008 04:40 AM  10 years agoPost 23
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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A non-governed motor isn't going to screamingly increase in RPM when unloaded - Remember when load is applied torque increases by pulling more amps in attempt to maintain RPM - When load is removed RPM may increase some but mainly it'll simply decrease amp draw and torque and continue maintaining relative RPM - I say relative RPM because with constant throttle RPM is relative to load - The more load applied the lower the RPM

Governor modes are usually set to about 80% of max RPM where the motor can run within it's efficiency band and still have headroom with which to maintain RPM with throttle without running out of throttle range and bogging

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02-10-2008 07:05 AM  10 years agoPost 24
DMShanks

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Salt Lake City, UT

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Remember when load is applied torque increases by pulling more amps in attempt to maintain RPM - When load is removed RPM may increase some but mainly it'll simply decrease amp draw and torque and continue maintaining relative RPM [quote]

Ah yes, the RPM is established by the volts applied to the motor. The load will tend to decrease RPM some, depending on the load magnitude. A lessening of load will allow the RPM to rise some, but the motor won't run screaming wild. The current draw will increase with and increase in load, which increases torque, tending to maintain a fixed head speed, even in a non-governor mode.

Dave

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02-10-2008 07:48 AM  10 years agoPost 25
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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Right - Relative to the magnitude of load - Constant throttle won't hold constant RPM under load like a gov will to an extent - I run a flat 100% curve on my BCP and can bog the headspeed down when like stick-banging some wild piroflips down on the deck and have to stop and recover some headspeed before it bogs right into the ground but it puts up a fight all the way and recovers quickly - A gov wouldn't help in this case as I'm already running max throttle so theres nothing left for a gov to compensate with so would also run out of throttle range and do the same thing - Gov is more useful when you have unboggable power and can achieve your desired headspeed at around 80% of max RPM

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02-10-2008 03:58 PM  10 years agoPost 26
DMShanks

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Salt Lake City, UT

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Gov is more useful when you have unboggable power and can achieve your desired headspeed at around 80% of max RPM
80% of max RPM meaning 80% of max power, such that the motor has 20% more power to deliver above and beyond the power needed to maintain the desired head speed at hover, such that head speed maintains even under some reasonable amount of load (cyclic/pitch/rudder input). Am I tracking?

Dave

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02-10-2008 04:19 PM  10 years agoPost 27
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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You got it - However with micros we usually soak the little motors for everything they've got just to have the full-time performance we desire so theres nothing left over with which to make use of a governor - Run full throttle and use cyclic/collective management to prevent bogging too deeply - A nice thing about a direct drive tail like on my BCP is you don't lose tail hold when bogging the main motor since it's rpm is independent from the main rotor - My H2 I have to use more management as to not bog the rpm down to where it loses tail authority

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02-10-2008 04:29 PM  10 years agoPost 28
DMShanks

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Salt Lake City, UT

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I think I've got it! Thanks all for the help. Have a great Sunday.

Dave

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