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Re: [Healeys] current draw of wipers

To: <m.g.sharp@sympatico.ca>, "'Bob Haskell'" <rchaskell@earthlink.net>, <healeys@autox.team.net>
Subject: Re: [Healeys] current draw of wipers
From: Harold Manifold via Healeys <healeys@autox.team.net>
Date: Sun, 14 Mar 2021 10:03:14 -0700 boundary="----=_NextPart_000_0000_01D718B9.40BA5A50"
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <002a01d718de$c406b820$4c142860$@sympatico.ca> <4e3dcebe-cc12-c936-93f5-8a02b3e612a9@earthlink.net> <004401d718f1$fd72c0a0$f85841e0$@sympatico.ca>
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This page from an old Lucas service manual may help=20

-----Original Message-----
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of
m.g.sharp@sympatico.ca
Sent: Sunday, March 14, 2021 9:49 AM
To: 'Bob Haskell'; healeys@autox.team.net
Subject: Re: [Healeys] current draw of wipers

Thank Bob and Mike, that makes intuitive sense based on the term =
=93stall
current=94, but I am surprised that they would give  that as a =
specification,
which is why I though it might be something else.  Why would they =
provide a
stall current for wipers, but not the starter motor, which can also lock =
up?
Also, if  the stall current for the wiper cold is 14 A, then why not put =
a
10A fuse on the circuit to save the motor if something jams?

Mirek

-----Original Message-----
From: m.g.sharp@sympatico.ca <m.g.sharp@sympatico.ca>
Sent: March 14, 2021 12:47 PM
To: 'Bob Haskell' <rchaskell@earthlink.net>; 'healeys@autox.team.net'
<healeys@autox.team.net>
Subject: RE: [Healeys] current draw of wipers

A sign of my advancing years and arcane brain is that I often forget to =
just
"google it".  The inter-web says:

"Stall current is the maximum current drawn, when the motor is applying =
its
maximum torque, either because it is being prevented from moving =
entirely or
because it can no longer accelerate given the load it is under."

Given that, I imagine that the draw will increase as resistance in the =
wiper
mechanism increases.  So old, stiff grease, general wear, bushings in =
the
wheel boxes creating friction, etc., will all increase the current draw.
Unless I actually find the energy and initiative to go out and measure =
it, I
think I'll use something like 5-6A in my calculations.

Still happy to hear opinions/experience on bulbs (halogen vs LED) for =
the
spot lamps.

Cheers, Mirek





-----Original Message-----
From: Bob Haskell <rchaskell@earthlink.net>
Sent: March 14, 2021 11:36 AM
To: m.g.sharp@sympatico.ca; healeys@autox.team.net
Subject: Re: [Healeys] current draw of wipers

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.=A0 I"m an oldish mechanical engineer, not electrical.=A0 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!,=A0 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=20
> wipers on.=A0 I know it is getting close to the measly 22 amp max =
output=20
> of the generator.
>
> The manual has specs for the wiper motor: =93normal running: 2.3 to =
3.1=20
> amps=94. Then is gives =93Stall Current=94 for the motor hot as 8 amps =
and=20
> for the cold motor 14 amps.=A0 My question is, what is =93Stall =
Current=94?
> The draw is huge compared to the normal running draw.=A0 Also, by cold =

> motor, I assume they mean the wiper motor as I cannot see how the=20
> engine temp would matter. However, although I get it that electric=20
> motors generate some heat, I don=92t think of them as =93warming =
up=94, or=20
> running hot or cold, so the huge difference between =A0=93hot motor=94 =
and=20
> =93cold motor=94 stall current further confuses me.
>
> Any help from the electric whizzes out there would be appreciated.
>
> BTW =96 regarding bulbs for the Spots, I like the idea of using LEDs =
as=20
> the current draw is so low and the light better, but I find that=20
> bright piercing light inconsistent with the character of our cars (a=20
> personal preference) and the price of them is almost 3 times a BPF 48=20
> W quartz halogen bulb.=A0 I also consider that I have been driving my
> BT7 for 46 years without spot lamps and got along OK, so I question=20
> 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=20
> 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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