Re: Any current sense amps that can handle 0V on one side of shunt?

On Jun 29, 4:15 pm, "Mook Johnson" <m...@xxxxxxxx> wrote:
"Michael" <nleah...@xxxxxxxxx> wrote in message

news:1183145879.069777.257720@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Hi there - I'm looking to sense currents going through the three lines
into a brushless motor. The motor will be operated in both directions,
so at some times I'll have something like 49.95 and 50.00 on the two
sides of the shunt resistor, and at other times I'll have 0 and 0.05
on the two sides of the shunt resistor. Are there any current sense
amplifiers that can handle this? Thanks!

-Michael

Which amps are your looking at and what does you're circuit look like.

not clear on what your mean for 49.95 to 50 on two sides?

Since resistors for a brushless motor using 6-step should be between the
source pins of the low side fets and power return.

I am using a brushless motor driver. It has a motor supply input, and
then outputs for the coils. I do not want to just measure current (on
the input of the motor controller) as I want directional information.
So instead, I plan on looking at individual coil currents. So, I plan
on putting shunt resistors on each wire to the motor. Sometimes those
shunts will be on the high end, and other times they'll be on the low
end. Thus I need a device that can handle both. Currently I'm looking
at using the Analog AD628 or AD8210.

-Michael

.

Relevant Pages

  • Re: Three wired DC Motor question.
    ... managed to rotate without the brushes you would find in any ordinary ... the motor for - too weak, too slow and the fan is molded into the ... then again I did wonder why a simple motor fan would cost several tens ... >very clear explanation of the brushless motor technology involved. ...
    (sci.electronics.repair)
  • Re: For those wanting to go electric, my long story
    ... install a brushless motor. ... brushless motor appropriate for the ElectroStreak and he handed me a new ... I came home from the show excited about the new power system. ...
    (rec.models.rc.air)
  • Re: searching brushless motor with sensors, 12V, 500-700Watt
    ... I search for an application with very high torque request at zero ... a brushless motor with sensors. ... Who can tell a manufacturer of such a motor? ... if the load should exceed the torque capability of the motor the motor's average torque will go to zero, leading to a failure mode that is, at best, unrecoverable until things stop. ...
    (sci.electronics.design)
  • Glow vs. electric motor equivalency
    ... and control line flying was king (only a few "older" folks ... I am still confused about electric motor sizes. ... compare one brushless motor to another, ... would make sense to someone who grew up with glow engines as ...
    (rec.models.rc.air)
  • Re: How to provide power to a spinning circuit ?
    ... >> brushless motor. ... >> base of the shaft of the motor and some coils that will be ... How much current does your PCB circuit require, ...
    (comp.arch.embedded)