Search found 924 matches

by rew
15 Apr 2018, 06:25
Forum: FOC
Topic: adjusting the F_SW and other attempts at silence
Replies: 1
Views: 101

Re: adjusting the F_SW and other attempts at silence

When you move F_SW up, the amount of time spent in the "every F_SW" interrupt (ADC interrupt) goes up. Measurements of the "time left" indicate that about 50% of the time is still not spent in the interrupt. So you could double F_SW. But the occasional overrun is probably quite b...
by rew
07 Apr 2018, 09:10
Forum: General
Topic: Writing to VESC
Replies: 3
Views: 198

Re: Writing to VESC

When you are just changing the operational parameters like "current", you should use the "set current" command. When you are in ERPM feedback mode, similarly you can set the target ERPM dynamically with a dynamic command. If you want to measure voltage and current, calculate watt...
by rew
04 Apr 2018, 20:42
Forum: Hardware Problems
Topic: Low Voltage on 3.3V and 5V Pin
Replies: 2
Views: 148

Re: Low Voltage on 3.3V and 5V Pin

If DRV gnd is unsoldered, the 5V will be higher than normal.
by rew
04 Apr 2018, 04:39
Forum: General
Topic: General questions
Replies: 12
Views: 993

Re: General questions

Because most people configure the throttle as a current control device, at 0 throttle you will command 0 current. In that case the vesc turns everything off. The gui will however show a duty cycle proportional to the speed.
by rew
14 Mar 2018, 07:37
Forum: General
Topic: Encoders and VESC
Replies: 3
Views: 275

Re: Encoders and VESC

Your original question is simple to answer: you use, IIRC, the HALL1, and HALL2 signal wires. Double check that those go to pins that have function TIMx-CH1 and TIMx-CH2 . where the x can be found under HW_ENC_TIM in hwconf/hw_<your hardware>.h . But.... then you probably have to write some software...
by rew
14 Mar 2018, 07:25
Forum: General
Topic: bigger magnets higher kv?
Replies: 1
Views: 169

Re: bigger magnets higher kv?

The motor has more torque-per-amp. So if the max RPM is limited by amps and the motor has significant drag at those speeds....
by rew
14 Mar 2018, 07:22
Forum: General
Topic: General questions
Replies: 12
Views: 993

Re: General questions

my understanding is the back emf voltage at this speed will exceed the battery voltage.\ When the voltage from the motor exceeds the battery voltage, the parasitic diodes in the mosfets will function as a three-phase-rectifier. Thus even without using the throttle, the motor will start working as a...
by rew
14 Mar 2018, 07:14
Forum: General
Topic: would this method be accurate to determine a motor winding resistance?
Replies: 3
Views: 241

Re: would this method be accurate to determine a motor winding resistance?

devin wrote:Is this accurate?

In the sense of "is this theoretically correct" the answer is: Yes. (albeit that your result includes the resistance of the VESC and maybe also the battery wires).

In the sense of: will the result be the same (similar) in different cases? The answer is: no.
by rew
04 Mar 2018, 10:12
Forum: General
Topic: General questions
Replies: 12
Views: 993

Re: General questions

Dor, please ignore Devin. He's got some non-scientific ways to get some results that are not scientifically valid. He starts out with assuming a gear ratio. That's the last thing you need. The motor can put out 2500 Watts. If we take that to be correct, the main question is: Can you do 15mph on 2500...
by rew
25 Feb 2018, 17:27
Forum: For sale, orders, etc.
Topic: MINI compatible with VESC® Software
Replies: 45
Views: 7280

Re: MINI compatible with VESC® Software

That datasheet quite conservative:
Lead Temperature for Soldering Purposes
(1/8″ from case for 10 s)
TL 260 °C

I would guess that it is safe for the soldering iron to be 1200 degrees at 1/8" from the case, for much longer than 10 seconds.... :lol:

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