1 Mar
2015
1 Mar
'15
12:27 p.m.
On 03/01/2015 11:53 AM, tony duell wrote:
Are there any discrete transistors for this? I know
the diagram in the
service manual shows them, but that is a different version of the motor
and the LB1620 can normally drive the windings directly. I don't remember
seeing them in the photos.
I found the datasheet for the LB1620 and apparently the thing is
perfectly capable of directly driving the motor windings. I note that a
small (10uF to 47uF) electrolytic is specified between each of the
windings and +24 Vcc. Were one of those to short, that would indeed
have nasty consequences as the output of the LB1620 is via a
complementary pair operating totem-pole fashion for each phase.
So, in absence of a readily available LB1620, I'd start with the
per-winding caps.
--Chuck