Re: Theorizing: cloning CBM electronics with modern technology.

From: Francesco Messineo <francesco.messineo_at_gmail.com>
Date: Fri, 1 Apr 2022 11:24:24 +0200
Message-ID: <CAESs-_xCkbiYfnJjjGdtCf_ososyp4sU_0KcuvyL8UtLCXRYvg_at_mail.gmail.com>
On Fri, Apr 1, 2022 at 11:12 AM smf <smf_at_null.net> wrote:
>
> Don't they already use PWM to maintain the correct RPM?

there's a "tachometer" signal, usually a pulse per turn obtained with
a permanent magnet and a hall sensor,
this pulse per turn is converted to a voltage and compared to a
reference voltage (usually settable with a trimpot).
The DC supply to the motor is increased or decreased to make the pulse
per turn averaged voltage equal to the
reference voltage. Usually no PWM involved here.

HTH
Frank IZ8DWF

>
> On 01/04/2022 07:41, William Levak wrote:
> >
> > Not a good idea. Drive motors are designed for a specific power
> > consumption. Runnig at a faster speed would require a higher power
> > consumption, which could be above what the drive was designed for.
> > Running at a lower speed may not provide enough power for the motor to
> > maintain a constant rotational speed.
> >
>
Received on 2022-04-01 12:01:20

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