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by devin
20 Dec 2017, 04:05
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8025

Re: "Peak Efficiency" Control Mode?

Where: D= 16.94 = Back EMF Voltage E = 18.821618 = PWM Effective Voltage Simply because 16.94V Back EMF Voltage is 90% of the applied 18.821618V PWM Effective Voltage, it follows that instantaneous electrical to mechanical conversion efficiency is also 90% . K= 90 = Desired Efficiency % Setting M= ...
by devin
19 Dec 2017, 18:15
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8025

Re: "Peak Efficiency" Control Mode?

Where: M= 100 = Throttle % Setting K= 90 = Desired Efficiency % Setting L= 500 = Desired Min Watts Available Setting P= 4500 = Desired Max Watts Available Setting G= 48.2 = Battery Voltage D= 16.94 = Back EMF Voltage F= 0.025 = Winding Resistance Ohms Y= 120 = Max Motor Amps Z= 95 = Max Duty Cycle ...
by devin
03 Dec 2017, 19:11
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

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. Source: https://en.wikipedia.org/wiki/Vector_control_(motor) " Projections associated with the (d,q) coordinate system typically ...
by devin
03 Dec 2017, 18:06
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

Re: 180 degree commutation with sensors vs standard 120

In theory: http://tppsf.com/120-vs-180-delta2.jpg http://tppsf.com/120-vs-180-wye.jpg 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 hea...
by devin
02 Dec 2017, 22:26
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

Re: 180 degree commutation with sensors vs standard 120

@rew wrote: No, From what I read above, the "180 deg commutation" is simply BLDC but with an extra motor coil powered up. (Y or Delta does not matter). But if we think about what we want to achieve.... We have a permanent magnet in an electromagnetic field. We want to set up that magnetic ...
by devin
02 Dec 2017, 05:09
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

Re: 180 degree commutation with sensors vs standard 120

after a bit more reading, i have a question— are “FOC” and “180 degree commutation” basically just 2 different words for the same thing? i should bow out of the conversation at this point as im only speculating.
by devin
02 Dec 2017, 04:14
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

Re: 180 degree commutation with sensors vs standard 120

@devin wrote: 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. i base this on the fact that when rewinding motors, shortening the conductor length increases the kv, but inc...
by devin
01 Dec 2017, 08:49
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

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. i base this on the fact that when rewinding motors, shortening the conductor length increases the kv, but increasing the co...
by devin
01 Dec 2017, 00:06
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

Re: 180 degree commutation with sensors vs standard 120

found this: https://www.researchgate.net/profile/Boyang_Hu/publication/238516491/figure/tbl1/AS:393296607236097@1470780626152/Table-1-Switch-sequences-of-120-and-180-degree-commutation.png Image Source: https://www.researchgate.net/profile/Boyang_Hu/publication/238516491/figure/tbl1/AS:3932966072360...
by devin
30 Nov 2017, 16:11
Forum: General
Topic: 180 degree commutation with sensors vs standard 120
Replies: 13
Views: 733

Re: 180 degree commutation with sensors vs standard 120

Doing some reading into “180 degree commutation” it would appear the power would go “in through 2 leads and out through 1 lead” as opposed to the traditional commutation sequence of power “in through 1 lead and out through 1 lead.” The advantage of this is presumably with a wye motor, all 3 phases a...

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