Subject:
|
Re: Inductor
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Tue, 15 Jun 1999 16:41:31 GMT
|
Original-From:
|
BART_SCHRIJVER@HP-SONOMA-OM2.OM.avoidspamHP.COM
|
Viewed:
|
906 times
|
| |
|
|
Denn:
If I am not mistaken, and please correct me if I am wrong (anybody),
but I think the inductor is in the circuit to protect the NiCd battery
pack and rest of circuit against possible reverse electro-mechanical
induction by the DC motors.
Motor power is on the unregulated side of the power circuit.
A DC motor is to convert DC power into mechanical energy, but it can
also do the reverse, in this case the polarity would be opposite and
be harmful to the battery pack.
An inductor has an impedance that rises with frequency, so at
f=infinity Z=high and at f=0 (DC) Z=0.
So if the motor generate electricity the coil will short them out to
ground and makes them stop as soon as power is removed by the L293D.
IC has PWM routines in it to regulate power to the motor, so there
will be a lot of on/off transitions, which can (and will) cause
electro-mechanical induction.
If you plan to use motors on your handyboard, you should use a coil to
protect your circuit and battery against this phenomenon and the value
is probably chosen based on the PWM frequencies and I would stay
close to this value.
Best regards, Bart Schrijver.
______________________________ Reply Separator _________________________________
Subject: Inductor
Author: Non-HP-denn (denn@technologist.com) at HP-PaloAlto,mimegw2
Date: 6/14/99 9:54 PM
Hi,
I see the HB circuit and found the 1uH that connect the GND Batteries and
GND.
I want to know the purpose of this inductor. Can I replace it with other
value or not use it .
Thanks
|
|
1 Message in This Thread:
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
