Search found 8 matches

by beak90
18 May 2017, 00:35
Forum: FOC
Topic: Encoder, Small Motor Issues
Replies: 1
Views: 1304

Re: Encoder, Small Motor Issues

The issue is probably related to the size of your motor. By default, most VESCs are setup for massive motors, so the current sensing circuit is setup for a scale of 0-165A. This results in a lot of noise in the low range of current. On mine, the noise was +-1A. The VESC cannot control the motor with...
by beak90
24 Apr 2017, 23:21
Forum: FOC
Topic: Current Filtering
Replies: 0
Views: 724

Current Filtering

Is there any code implemented to filter the current sense signals? The BLDC tool has the current filters in the current tab, and I got pretty good results filtering the data with an FIR filter. This seems like it would be pretty complicated to implement into the code myself. Since this was in the cu...
by beak90
14 Apr 2017, 00:17
Forum: FOC
Topic: Shunt Sizing
Replies: 7
Views: 2079

Re: Shunt Sizing

I decided not to make this change. I did some more looking and realized that the issue is 100% noise, not ADC resolution. When the motor isn't turning and there is no current being fed to the motor, the current page shows +-1A on all the coils, with about .4A of higher frequency noise within that la...
by beak90
12 Apr 2017, 19:49
Forum: FOC
Topic: Shunt Sizing
Replies: 7
Views: 2079

Re: Shunt Sizing

I'm going to attempt switching the DRV gain to 40x. Someone should let me know if this is likely to explode something :P
by beak90
12 Apr 2017, 19:43
Forum: General
Topic: Brushed DC motor connections
Replies: 2
Views: 741

Re: Brushed DC motor connections

Using a DC motor with the VESC is very simple. You leave the middle wire on the VESC unconnected, and just use the two outside wires. And of course select DC motor in the bldc-tool. You won't get rpm control without an encoder, but you should be able to do current control.
by beak90
10 Apr 2017, 20:02
Forum: FOC
Topic: Shunt Sizing
Replies: 7
Views: 2079

Re: Shunt Sizing

This thread cleared up a few things: http://vedder.se/forums/viewtopic.php?t=462 Do you think it would be useful to change the gain on the DRV to 40x? It is currently tied to ground, so 10x. This would be a super nice way of switching motor sizes, because I could tie this pin to an output on the MC,...
by beak90
09 Apr 2017, 01:07
Forum: FOC
Topic: Shunt Sizing
Replies: 7
Views: 2079

Re: Shunt Sizing

Here's a bit more info. The motor parameters I got using FOC are: R:0.07605 Ohm, L:10.55uH, Lambda:0.000940 I tried time constants between 100uS to 10,000uS, and somewhere around 500uS worked the best. Lower resulted in the current oscillating once it reached the setpoint. With it at 1000uS and high...
by beak90
08 Apr 2017, 22:30
Forum: FOC
Topic: Shunt Sizing
Replies: 7
Views: 2079

Shunt Sizing

I'm working on making a motor test bench to get a motor model from various different brushed and brushless motors. I have been playing with my VESC and I'm realizing that there may be some issues with testing a wide range of motors. Brushed motors are working fine of course. But I can't get any of t...

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