Anyone running the LYEN 18FET sensorless controller ?

Electric Motors and Controllers
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rumme   100 kW

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Anyone running the LYEN 18FET sensorless controller ?

Post by rumme » Oct 17 2017 7:29pm

Are you able to get it to pump out more then 70 amps in sensorless mode? I'm running a 72 volt battery that can output 140 phase amps and 100 continuous amps , and I am using 8 gauge wires . At full throttle with my Magura throttle , I can only get a maximum of 70 amps out of the controller.

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amberwolf   100 GW

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by amberwolf » Oct 17 2017 11:12pm

Under what mechanical load?

The controller only outputs the power necessary to make the motor do the work it's being called upon to do.

Your battery cannot output any phase amps.
Last edited by amberwolf on Oct 18 2017 12:18am, edited 1 time in total.

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Alan B   100 GW

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by Alan B » Oct 17 2017 11:43pm

The controller puts out voltage, the motor draws current. The controller may reduce output voltage to limit current, if it detects too much current.

rumme   100 kW

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by rumme » Oct 18 2017 10:26am

Well I had a Kelly controller hooked up to this same ebike a few weeks ago and I was getting 100- 120 amps at full throttle in sensored mode.
I decided to go to the LYEN controller to use sensorless, and the max amps I can get is now only 70 amps. Everyhting else is the same on the ebike, I only changed Out the controllers.

I think this LYEN is rated to handle 100 amps but I cant get over 70 amps out of it.

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madin88   100 MW

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by madin88 » Oct 18 2017 12:30pm

I guess you have set more than 70A batt in the programming software?

rumme   100 kW

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by rumme » Oct 18 2017 2:24pm

madin88 wrote:I guess you have set more than 70A batt in the programming software?
Lyen set it to 95 max phase amps.

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amberwolf   100 GW

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by amberwolf » Oct 18 2017 2:31pm

Phase amps are not battery amps

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by rumme » Oct 18 2017 3:28pm

amberwolf wrote:Phase amps are not battery amps
Oh, I thought phase amps setting was just another term for max amps setting. Lyen set the controller for 70 continuous amps and 95 max/ phase amps.

I'm only able to get a max of 70 amps out of it, but I know my battery can deliver 140 amps , cause it used to do it with my Kelly controller.

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by Alan B » Oct 18 2017 11:52pm

Sounds like you are getting exactly the 70 amps Edward set it for. Those are battery amps, the motor current is nearly always larger than the battery current, but rarely is motor current measured as it is a 3 phase AC signal.

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by amberwolf » Oct 19 2017 12:49am

rumme wrote:Oh, I thought phase amps setting was just another term for max amps setting.
Phase amps are the amps the motor itself sees at each phase wire. Common controllers like the Lyen can't actually measure phase amps, it can only approximately calculate them based on battery amps and a formula built into it's programming.

There are controllers like Sevcon, Lebowski, and I think Kelly, and other advanced ones, that do actually measure phase current on at least two phases (some all three), but the common ebike controllers don't do this (the hardware is more expensive than that to measure battery current, and requires different programming).

Lyen set the controller for 70 continuous amps
<snip>
I'm only able to get a max of 70 amps out of it,
Then you're getting exactly what the controller is set for.

If the controller is capable of it, you can program it (or have Lyen do so) to be able to draw more current (if the motor demands it).

But right now, it's doing what it's supposed to.

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Re: Anyone running the LYEN 18FET sensorless controller ?

Post by rumme » Oct 19 2017 10:16am

Thanks for the replies.

So it is currently set to 70 amps continuous and 95 amps phase. Does this sound like proper settings or should the phase amps be set higher ?

What does the phase amps impact ? Do phase amps make the ebike have more power ? I wrongly though that phase amps was another term for " max burst amps" .

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