On Saturday 16 May 2015 06:49:39 Gregg Eshelman wrote:
> Have a look at this motor speed control being developed to accurately
> sense RPM without an encoder.
>
> http://hackaday.com/2015/05/15/hackaday-prize-entry-dc-motor-controlle
>r/
Unforch, the "never miss a hack" link is handled by mailchim
On Saturday 16 May 2015 06:49:39 Gregg Eshelman wrote:
> Have a look at this motor speed control being developed to accurately
> sense RPM without an encoder.
>
> http://hackaday.com/2015/05/15/hackaday-prize-entry-dc-motor-controlle
>r/
This one bears watching. Accurately enough to rigid tappin
Have a look at this motor speed control being developed to accurately
sense RPM without an encoder.
http://hackaday.com/2015/05/15/hackaday-prize-entry-dc-motor-controller/
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On 15.05.15 09:04, Kirk Wallace wrote:
> I have a soft spot for these SCR speed controllers:
> http://www.kbelectronics.com/manuals/kbic_manual.pdf
>
> They can run DC motors or AC universal motors, plus have a separate
> field source if needed (see page 8).
>
> They use back EMF for speed feedb
On 05/15/2015 10:41 AM, Stephen Dubovsky wrote:
> Hmm. Don't think so. Series motors run crazy RPM when load is removed due
> to field weakening and will always vary RPM based on load. A typ handheld
> corded drill has a pretty set top speed and doesn't bog until you really
> start to lean on it
For universal motor reference:
http://en.wikipedia.org/wiki/Universal_motor
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Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/
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5/2015 10:42 AM
Subject: Re: [Emc-users] ot: motor speed control
Hmm. Don't think so. Series motors run crazy RPM when load is removed
due
to field weakening and will always vary RPM based on load. A typ handheld
corded drill has a pretty set top speed and doesn't bog until you r
On 05/15/2015 08:29 AM, Jon Elson wrote:
> On 05/15/2015 08:44 AM, kqt4a...@gmail.com wrote:
>> As I understand an AC brushed motor(drill, router, saw) can be controlled
>> by varying the voltage with something like a light dimmer but with great
>> loss of torque
>> Can a motor like this be control
Hmm. Don't think so. Series motors run crazy RPM when load is removed due
to field weakening and will always vary RPM based on load. A typ handheld
corded drill has a pretty set top speed and doesn't bog until you really
start to lean on it. That would indicate to me parallel wound.
On Fri, Ma
On 05/15/2015 09:34 AM, Stephen Dubovsky wrote:
> A brushed AC motor in a drill/router/saw is almost assuredly a 'universal'
> motor. Its a DC parallel field wound motor.
I really think you mean SERIES, here.
Jon
--
One
On 05/15/2015 08:44 AM, kqt4a...@gmail.com wrote:
> As I understand an AC brushed motor(drill, router, saw) can be controlled
> by varying the voltage with something like a light dimmer but with great
> loss of torque
> Can a motor like this be controlled with pwm
>
>
Yes, but you still lose torque
A brushed AC motor in a drill/router/saw is almost assuredly a 'universal'
motor. Its a DC parallel field wound motor. Thus both the rotor and
stator are connected to the same terminals. When the AC polarity reverses
BOTH magnetic fields reverse and the motor still turns the same direction
(both
On 15 May 2015 at 15:14, wrote:
>
> So in your opinion is something like
> http://www.amazon.com/E-Age-50-220V-2000W-Motor-Controller/dp/B00GMBYFRK
> worth even giving a try
It rather depends on what you want to do. Those devices are motor
power controllers and only indirectly control the speed.
On Fri, 15 May 2015, andy pugh wrote:
> On 15 May 2015 at 14:44, wrote:
>> Can a motor like this be controlled with pwm
>
> Yes, that is what the light-dimmers do.
>
> Brushed-AC (universal) motors will also work on DC, but typically they
> require much less voltage in DC operation.
>
> (PWM-mod
On Friday 15 May 2015 09:44:57 kqt4a...@gmail.com wrote:
> As I understand an AC brushed motor(drill, router, saw) can be
> controlled by varying the voltage with something like a light dimmer
> but with great loss of torque
> Can a motor like this be controlled with pwm
>
The AC motor doesn't lend
On 15 May 2015 at 14:44, wrote:
> Can a motor like this be controlled with pwm
Yes, that is what the light-dimmers do.
Brushed-AC (universal) motors will also work on DC, but typically they
require much less voltage in DC operation.
(PWM-modulation of AC current isn't all that simple)
--
atp
As I understand an AC brushed motor(drill, router, saw) can be controlled
by varying the voltage with something like a light dimmer but with great
loss of torque
Can a motor like this be controlled with pwm
--
One dashbo
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