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Old 10-31-2010, 06:45 PM   #1
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Default variable timing - sensorless?

Are there ESC's that can apply variable timing on a sensorless motor?

I know a Tekin ESC can apply it when running sensored or in dualmode ... but when without sensor?
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Old 10-31-2010, 09:11 PM   #2
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You can't have variable timing in dual mode, only fixed timing. Once the car is rolling, it's sensorless.
Variable timing works from feedback provided by the sensors, I don't think back-EMF from a sensorless motor provides that info.
I may get corrected....
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Old 11-01-2010, 01:03 PM   #3
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it can no esc on market make it

very hard to control on decelerating
work only at 100% pwm (power)
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Old 11-01-2010, 01:33 PM   #4
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Quote:
Originally Posted by Low_E View Post
Are there ESC's that can apply variable timing on a sensorless motor?

I know a Tekin ESC can apply it when running sensored or in dualmode ... but when without sensor?
The latest version of hotwire on the tekin not only applies to dual mode but strictly sensorless as well. So, yes there are esc's that can apply variable sensorless timing; the rx8, rs, and rs pro.
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Old 11-01-2010, 01:41 PM   #5
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Quote:
Originally Posted by JR007 View Post
You can't have variable timing in dual mode, only fixed timing. Once the car is rolling, it's sensorless.
Variable timing works from feedback provided by the sensors, I don't think back-EMF from a sensorless motor provides that info.
I may get corrected....
JR007 -- not only is it possible, but you own an ESC that does it!

See Krio's response above.
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Old 11-01-2010, 02:47 PM   #6
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Krio is right.

We do have variable timing in both the RS line and the Rx8. Dual mode is simply a sensored start with sensorless operation. We can still manipulate the timing without sensors.
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Old 11-01-2010, 03:24 PM   #7
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Well, blow me down. Another reason i'm glad i've been Tekin from the beginning! That'd be reason 212. And counting....
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Old 11-01-2010, 05:37 PM   #8
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well I actually thought so too that the Tekin Rs Pro could do, but some friends tried to convice me otherwise, said it could not be done.
thx for the info
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