On Thu, 11 Jul 2013, propcoder wrote:
> Date: Thu, 11 Jul 2013 07:06:15 +0300
> From: propcoder <marius.alks...@gmail.com>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Custom firmware for MESA and BLDC motors
>
> I am not sure I understand this correctly, but maybe this is possible:
>
> substract_encoder_offset --> mod_encoder_count --> take_only_needed_MSB
> --> customized_table_lookup with custom pre-calculated encoder offsets
> for 120 and 240 degrees --> scale_multiply_sines --> 3_PWMGENS
>
> I mean use pre-calculated sine table for particular encoder scale,
> possibly shorter by 2, 4, 8, etc. times of encoder counts (rougher)
> which would be smooth enough.
>
> If made open-source, maybe these firmware files could be compiled by the
> users theirself..
>
> New ideas:
> Idea #1:
> use rough sine table in FPGA for fast speed and software for slow speed.
> Or just give software a possibility to send it's own values, but if it
> doesn't do that - use hardware's on transition to new table value.
>
> Idea #2 (at least):
> make phase commutation in HW. I mean when sine crosses zero (on hall
> signal slope), just commutate different phases and leave values the same.
>
BTW, did you try the latest BLDC version in master? It should make a big
improvement by halving the peak error in the commutation angle
Peter Wallace
Mesa Electronics
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