Re: [Healeys] current draw of wipers

[Michael Salter via Healeys <healeys@autox.team.net>]

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Yes Bob I would agree and when the motor is cold it will pass more current
as I understand it.

M

On Sun., Mar. 14, 2021, 11:36 a.m. Bob Haskell, <rchaskell@earthlink.net>
wrote:

> Mirek,
>
> I believe that stall current is the load developed when the motor is not
> able to rotate - the mechanism is locked up - wipers frozen to the
> windshield.  I"m an oldish mechanical engineer, not electrical.  So
> someone else may have a better answer.
>
> Cheers,
>
> Bob Haskell
> Austin Healey 3000 BN7/BT7 registrar
>
> On 3/14/21 10:31 AM, m.g.sharp--- via Healeys wrote:
> >
> > Happy Sunday!,  I am making some decisions on bulbs (and the LED
> > equivalent) for some Lucas Spot lamps I am fitting to my BT7, and I am
> > concerned about the total draw if I have headlamps, spot lamps and
> > wipers on.  I know it is getting close to the measly 22 amp max output
> > of the generator.
> >
> > The manual has specs for the wiper motor: =E2=80=9Cnormal running: 2.3 =
to 3.1
> > amps=E2=80=9D. Then is gives =E2=80=9CStall Current=E2=80=9D for the mo=
tor hot as 8 amps and
> > for the cold motor 14 amps.  My question is, what is =E2=80=9CStall Cur=
rent=E2=80=9D?
> > The draw is huge compared to the normal running draw.  Also, by cold
> > motor, I assume they mean the wiper motor as I cannot see how the
> > engine temp would matter. However, although I get it that electric
> > motors generate some heat, I don=E2=80=99t think of them as =E2=80=9Cwa=
rming up=E2=80=9D, or
> > running hot or cold, so the huge difference between  =E2=80=9Chot motor=
=E2=80=9D and
> > =E2=80=9Ccold motor=E2=80=9D stall current further confuses me.
> >
> > Any help from the electric whizzes out there would be appreciated.
> >
> > BTW =E2=80=93 regarding bulbs for the Spots, I like the idea of using L=
EDs as
> > the current draw is so low and the light better, but I find that
> > bright piercing light inconsistent with the character of our cars (a
> > personal preference) and the price of them is almost 3 times a BPF 48
> > W quartz halogen bulb.  I also consider that I have been driving my
> > BT7 for 46 years without spot lamps and got along OK, so I question
> > the need to go to LEDs, other than the advantage of low current draw.
> > Any experiences from those of you who have spot lamps with
> > conventional bulbs and the older low output generator (i.e. BT/BN7 and
> > earlier), would be appreciated.
> >
> > Cheers, Mirek
> >
> >
> > _______________________________________________
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> >
>
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<div dir=3D"auto">Yes Bob I would agree and when the motor is cold it will =
pass more current as I understand it.<div dir=3D"auto"><br></div><div dir=
=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Sun., Mar. 14, 2021, 11:36 a.m. Bob Haskell, &lt;<a hre=
f=3D"mailto:rchaskell@earthlink.net";>rchaskell@earthlink.net</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">Mirek,<br>
<br>
I believe that stall current is the load developed when the motor is not <b=
r>
able to rotate - the mechanism is locked up - wipers frozen to the <br>
windshield.=C2=A0 I&quot;m an oldish mechanical engineer, not electrical.=
=C2=A0 So <br>
someone else may have a better answer.<br>
<br>
Cheers,<br>
<br>
Bob Haskell<br>
Austin Healey 3000 BN7/BT7 registrar<br>
<br>
On 3/14/21 10:31 AM, m.g.sharp--- via Healeys wrote:<br>
&gt;<br>
&gt; Happy Sunday!,=C2=A0 I am making some decisions on bulbs (and the LED =
<br>
&gt; equivalent) for some Lucas Spot lamps I am fitting to my BT7, and I am=
 <br>
&gt; concerned about the total draw if I have headlamps, spot lamps and <br=
>
&gt; wipers on.=C2=A0 I know it is getting close to the measly 22 amp max o=
utput <br>
&gt; of the generator.<br>
&gt;<br>
&gt; The manual has specs for the wiper motor: =E2=80=9Cnormal running: 2.3=
 to 3.1 <br>
&gt; amps=E2=80=9D. Then is gives =E2=80=9CStall Current=E2=80=9D for the m=
otor hot as 8 amps and <br>
&gt; for the cold motor 14 amps.=C2=A0 My question is, what is =E2=80=9CSta=
ll Current=E2=80=9D?=C2=A0 <br>
&gt; The draw is huge compared to the normal running draw.=C2=A0 Also, by c=
old <br>
&gt; motor, I assume they mean the wiper motor as I cannot see how the <br>
&gt; engine temp would matter. However, although I get it that electric <br=
>
&gt; motors generate some heat, I don=E2=80=99t think of them as =E2=80=9Cw=
arming up=E2=80=9D, or <br>
&gt; running hot or cold, so the huge difference between =C2=A0=E2=80=9Chot=
 motor=E2=80=9D and <br>
&gt; =E2=80=9Ccold motor=E2=80=9D stall current further confuses me.<br>
&gt;<br>
&gt; Any help from the electric whizzes out there would be appreciated.<br>
&gt;<br>
&gt; BTW =E2=80=93 regarding bulbs for the Spots, I like the idea of using =
LEDs as <br>
&gt; the current draw is so low and the light better, but I find that <br>
&gt; bright piercing light inconsistent with the character of our cars (a <=
br>
&gt; personal preference) and the price of them is almost 3 times a BPF 48 =
<br>
&gt; W quartz halogen bulb.=C2=A0 I also consider that I have been driving =
my <br>
&gt; BT7 for 46 years without spot lamps and got along OK, so I question <b=
r>
&gt; the need to go to LEDs, other than the advantage of low current draw.=
=C2=A0 <br>
&gt; Any experiences from those of you who have spot lamps with <br>
&gt; conventional bulbs and the older low output generator (i.e. BT/BN7 and=
 <br>
&gt; earlier), would be appreciated.<br>
&gt;<br>
&gt; Cheers, Mirek<br>
&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Support Team.Net <a href=3D"http://www.team.net/donate.html"; rel=3D"no=
referrer noreferrer" target=3D"_blank">http://www.team.net/donate.html</a><=
br>
&gt; Suggested annual donation=C2=A0 $12.75<br>
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