Chris Loiacono wrote:
> I have to include a fairly basic motor controller in a
> PIC based design (Several PIC's actually) for a machine
> control upgrade. The motor being controlled now is a
> PMDC 90V 1/8 HP gearmotor with 12 RPM out. I am hoping
> to reduce the cost of the motor and have been looking
> into different types to replace it with.
> Since PWM is so simple from the control perspective,
> it is most desirable. I am sure there are those of you
> with more experience in this area  - can any shunt or
> series wound motor be controlled with PWM? What motor
> types can it be used to control?

 Ask Roman, if he could publish his 2-tran SMPS in
a programmable version.
 1. Just replacing zener ZD1 with a set of resistors on
open collectors of transistors controlled by PIC.
 2. Or using PIC's PWM, transistor to get some voltage
on a capacitor, placed instead of zener ZD1.

 Zener stabilization is not needed when using PIC.
(PIC has A/D for feedback loop).

 There might be many reasons for not using motor coils
as DC/DC chokes.

 Mike.
(Decent alternative for this case is, for example,
STM Viper, used as regulated supply)

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