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by rew
27 Mar 2016, 20:03
Forum: General
Topic: Is it possible to use the vesc for wheelchair hub motor
Replies: 9
Views: 2331

Re: Is it possible to use the vesc for wheelchair hub motor

The "nominal voltage" and "nominal power" allow us to calculate the maximum current: 100A. That's too much for the current VESC.

P.S. If there are more decimal points missing I may need to revise my conclusion.
by rew
27 Mar 2016, 20:02
Forum: General
Topic: case for VESC
Replies: 10
Views: 3634

Re: case for VESC

It helps to know what voltage and current you are expecting. But even at the maximums, I would think that thermally connecting the fets to the case will be better than nothing.
by rew
27 Mar 2016, 18:06
Forum: For sale, orders, etc.
Topic: VESC-based board(s) for sale....
Replies: 42
Views: 12259

Re: VESC-based board(s) for sale....

RE PM/email vs posting here: Agreed. But if for some reason you prefer PM or Email I'm game too. No not altium. Eagle. Why not DRV8302? Well, I calculated the 12V current for VESC and found we were already close to or over the allowed current for the DRV8302. I asked TI what could be done about abou...
by rew
27 Mar 2016, 16:56
Forum: General
Topic: VESC at high Voltage (and KV)
Replies: 14
Views: 4862

Re: VESC at high Voltage (and KV)

So my 50A max motor should be rated at "max 1.25V". Yep, if you wanted to make a brushless gimbal out of it (which is always stalled so all the consumed power is turned into heat) the max would be truly 1.25V (at 50A) to not overheat it without external cooling. In that situation 250rmp w...
by rew
27 Mar 2016, 16:27
Forum: Feature Requests
Topic: ADC channel configuration.
Replies: 3
Views: 1612

Re: ADC channel configuration.

OK. First patch... I'd like to hear from you if you find this the proper way to proceed. As I don't have hardware to test everything, I have to be very careful not to break something. If it would break, it would be difficult to debug. So I've spent more than an hour preparing. Now I can compile my r...
by rew
27 Mar 2016, 14:00
Forum: For sale, orders, etc.
Topic: VESC-based board(s) for sale....
Replies: 42
Views: 12259

Re: VESC-based board(s) for sale....

First: Feel free to ask questions here, or in PM or through Email (if you can find it :D ). Yeah, I'm a bit stupid in that I don't always realize what people need to know. So please help me by asking the questions that come up. No pictures available now or tomorrow. Hopefully Tuesday. I'm not ready ...
by rew
27 Mar 2016, 13:38
Forum: Feature Requests
Topic: ADC channel configuration.
Replies: 3
Views: 1612

Re: ADC channel configuration.

Anything I can do to help to get support 3-shunt operation started? My hardware already has 3-shunts, with the B-phase shunt value being ignored by the software... I would find it interesting to plot the calculated third phase current next to the measured one. Can I make another suggestion? I have t...
by rew
27 Mar 2016, 13:24
Forum: General
Topic: VESC at high Voltage (and KV)
Replies: 14
Views: 4862

Re: VESC at high Voltage (and KV)

You're right. All motors work that way. So my 50A max motor should be rated at "max 1.25V". That's going to allow about 250RPM! Great! Peak power output is going to be about 1/2 of 1.25V * 50V. (32W) Under those conditions it is hard to break that motor. What I mean with "modern"...
by rew
27 Mar 2016, 11:27
Forum: General
Topic: Need help upgrading DRV8302
Replies: 29
Views: 9226

Re: Need help upgrading DRV8302

Your screenshot says 2.89v target voltage, and the USB perihperal is not meant to be used below 3.0v, it could be that. The STLINK programmers are built to sense the target voltage. However somehow everybody thinks this is unnecessary, so you get to see wildly varying numbers reported as target vol...
by rew
27 Mar 2016, 11:20
Forum: General
Topic: Is it possible to use the vesc for wheelchair hub motor
Replies: 9
Views: 2331

Re: Is it possible to use the vesc for wheelchair hub motor

Matt, if the motors are BLDC, then I would say that VESC is a resonable choice. At first I thought the motors were oldfashioned DC motors.)

Can you provide a link to the motors that you have?

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