On Mon, 15 Jul 2013, propcoder wrote:
Date: Mon, 15 Jul 2013 22:11:44 +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] hm2 - pwmgen vs 3pwmgen for BLDCs
Does 7i39 have current feedback and control?
The 7I39 has current limit but no current control. The reason it typically
works better then IGBT based HBridges in voltage mode is that it uses MOSFET
switches which are faster the IGBTs and therefore has a much shorter deadtime
so there is less distortion (maybe only 10% as much) in the (uncorrected)
drive waveform.
2013.07.15 21:35, Peter C. Wallace ra????:
Motion without feedback (step motor mode) may well be lumpy at the sine wave
zero crossings however, since the drive will remain 0 until the PWM width gets
as big as the deadzone.
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Peter Wallace
Mesa Electronics
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