Search found 246 matches

by devin
13 May 2017, 01:47
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 32984

Re: code to change the motor amp limit

i think my original guess was wrong about being able to distinguish delta and wye by comparing 1 to 1 and 1 to 2 lead resistance measurements because all 3 windings are energized at the same time with delta... and only 2 at a time with wye... so recalculating... if a lead-to-virtual-ground-point seg...
by devin
12 May 2017, 12:50
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 32984

Re: code to change the motor amp limit

Benjamin seems to assume that most motors are Y wound. As far as I know, most motors (that we use) are delta-wound. All this does not matter, if I allow you to take (only) external measurements of two motors, one Y wound, one delta-wound you cannot tell which is which. So even when the motor is del...
by devin
11 May 2017, 22:11
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 32984

Re: code to change the motor amp limit

@benjamin... question: if motors are delta wound not wye, does one still need to double the resistance figure of the VESC detection to calculate lead to lead resistance?
by devin
11 May 2017, 21:13
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 32984

Re: code to change the motor amp limit

@hummie apparently in the 48/200/200 test @ 35V Assumed Pack V with Sag, 0.0415ohm VESC detected winding (0.0830ohm lead-to-lead).. I believe this is what happened (someone please correct me if I am wrong-- trying to understand myself!): you could not have reached 200 motor amps because of the coded...
by devin
11 May 2017, 14:38
Forum: General
Topic: How should the VESC "feel" on a board?
Replies: 71
Views: 9552

Re: How should the VESC "feel" on a board?

When Accelerating Full Throttle , in the very short timescale while still close to ~0rpm , assuming 0.0830ohm winding resistance lead-to-lead & 50V DC , "Bland Mode" 10 Battery Amps x 50V DC = 500W = ( 77.61A Motor Amps x 0.0830ohm Winding Resistance) x 77.61A Motor Amps [I^2R] = 77.61...
by devin
11 May 2017, 11:25
Forum: General
Topic: How should the VESC "feel" on a board?
Replies: 71
Views: 9552

Re: How should the VESC "feel" on a board?

Just set your battery amp limit to 10. Then, in theory the VESC will try to push "infinite AMPS" through the motor at 0RPM. To keep the VESC in one piece you need to set a motor (=VESC) current limit too. (the VESC heats up proportional to the MOTOR current, not the battery current). So i...
by devin
10 May 2017, 21:48
Forum: General
Topic: How should the VESC "feel" on a board?
Replies: 71
Views: 9552

Re: How should the VESC "feel" on a board?

What exactly are you trying to achieve? Was it not acceleration that feels even? I get the feeling that you are completely ignoring what I'm writing... @Benjamin I learned something new from what you said about the current being recycled through the motor during the duty cycle off time, and also th...
by devin
10 May 2017, 17:44
Forum: General
Topic: How should the VESC "feel" on a board?
Replies: 71
Views: 9552

Re: How should the VESC "feel" on a board?

for example if motor amp limit were set to "40" with the 0.0415ohm x 2 = 0.0830ohm winding 40 motor amps limit only "allows" 132.8watts close to 0rpm full throttle (40 motor amps x 3.32v pwm effective volts = 132.8w) 132.8watts / 50v battery volts = 2.65 battery amps therefore wi...
by devin
10 May 2017, 17:31
Forum: General
Topic: How should the VESC "feel" on a board?
Replies: 71
Views: 9552

Re: How should the VESC "feel" on a board?

if the winding resistance detection was 0.0415ohm x 2 = 0.0830ohm, and the motor amp limit was set to 77.61 motor amps, then 500w and 10 battery amps would be "allowed" to occur at full throttle, even close to 0rpm in this theoretical battery current control esc, if the motor amp limit is ...
by devin
10 May 2017, 17:25
Forum: General
Topic: How should the VESC "feel" on a board?
Replies: 71
Views: 9552

Re: How should the VESC "feel" on a board?

Let's imagine a motor controller that is programmed to the following: full throttle = 10 battery amps at all physically possible rpms (current control) (50v pack voltage assumed - 500w is desired) full throttle = 10 battery amps x 50v = 500w at all physically possible rpms (with no sag) if sag bring...

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