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by Hummie
03 Dec 2017, 18:52
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 765

Re: 180 degree commutation with sensors vs standard 120

the D and Q field vectors of a spinning motor must be seen to know whats going on. need a moving diagram to visualize and then we can talk about something for sure.
by Hummie
03 Dec 2017, 17:34
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 765

Re: 180 degree commutation with sensors vs standard 120

I don't see 180 commutation shortening electrical pathways just when they were fed rew with two coils being powered instead of one I see the motor would have two iron teeth being magnetized and on a slow moving heavily loaded skateboard the motor would maybe even have double the torque output before...
by Hummie
02 Dec 2017, 00:32
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 765

Re: 180 degree commutation with sensors vs standard 120

i'm going to go out on a limb and make a strange prediction that switching from 120 degree to 180 degree commutation increases the "apparent" kv of delta but not wye. what's apparent vs real. ill assume you mean real would be from generated from the motor and apparent with an applied volta...
by Hummie
01 Dec 2017, 02:14
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 765

Re: 180 degree commutation with sensors vs standard 120

i'm still stuck on the old question of why a wye motor doesn't suck with a high load as it seems to only be using 2/3 the teeth and would be more likely to saturate having less iron. I feel like this question has to be answered before getting any more complex especially since ironically people say w...
by Hummie
30 Nov 2017, 02:35
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 765

180 degree commutation with sensors vs standard 120

I heard with sensors you can commutate at 180 degrees with a 3 phase motor vs 120 and therefore get more torque. do people do this? I thought sensors were only a hair more efficient and at the lowest speeds but if this were the case I'd think you could get greater efficiency at any speed if there wa...
by Hummie
29 Sep 2017, 19:59
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8285

Re: "Peak Efficiency" Control Mode?

looking at the grin tech motor simulator you can see when the load is increased the efficiency drops with every motor on there regardless of the power applied. having the esc programmed to only apply a voltage within a close proximity of the back voltage, which would limit the power, still has the m...
by Hummie
05 Sep 2017, 00:13
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8285

Re: "Peak Efficiency" Control Mode?

maybe it was mentioned and the wattage posted is a the high end of the speed spectrum and how much power it would have going from 3 to 5mph when the voltages are so low? if that's what youre saying...always keeping the applied voltage just a hair above the back emf.
by Hummie
04 Sep 2017, 23:50
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8285

Re: "Peak Efficiency" Control Mode?

seems like it would just be a really low acceleration program as it would always have to keep the applied voltage so close to the back emf and minimal current flow. http://www.ebikes.ca/tools/simulator.html/?bopen=true&throt=50&cont=C40&motor=MTC4080&hp=0&grade=13&batt=B7223_...
by Hummie
04 Sep 2017, 20:39
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8285

Re: "Peak Efficiency" Control Mode?

if your most efficient speed is 25mph and youre starting from 0 but limited in your ability to accelerate you will lull around in inefficiency for a longer time as it takes longer to get to the efficient speed. it seems easier to use your "internal computer" in choosing what amount of acce...
by Hummie
02 Sep 2017, 17:14
Forum: FOC
Topic: vesc with sensors efficiency
Replies: 1
Views: 411

vesc with sensors efficiency

could someone link me to it if it's already written somewhere but how much more efficient running foc with sensors vs foc without sensors and at what rpms is it relevant? anyone do a comparison? I ask because sensors are a pain in the ass to put in and seem just another part to break. if they don't ...

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