Search found 107 matches

by Hummie
13 Apr 2018, 06:40
Forum: FOC
Topic: adjusting the F_SW and other attempts at silence
Replies: 1
Views: 165

adjusting the F_SW and other attempts at silence

are there any other settings that can be safely changed to make the motor quieter besides the F_SW? Whats the upper limit on the F_SW?
by Hummie
12 Mar 2018, 04:53
Forum: General
Topic: bigger magnets higher kv?
Replies: 1
Views: 212

bigger magnets higher kv?

i'll spin up as fast as I can on 15.5 volts in the realtime data and get: 9mm magnets: 7750 erpm divided by 7poles and 15.5v and get..71kv and about 85% magnet coverage 10mm magnets: 8200 erpm divided by 7 poles and 15.5 and get 82kv which has about 96% magnet coverage. I thought for sure I'd be get...
by Hummie
03 Dec 2017, 18:52
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 1577

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: 1577

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: 1577

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: 1577

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: 1577

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: 110
Views: 13956

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: 110
Views: 13956

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: 110
Views: 13956

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_...

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