Classic cars forum & vehicle restoration.
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Kleftiwallah
Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire
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 Posted: Thu Jun 01, 2017 10:59 am Post subject: Lucas 6V starter motor |
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The electric world frightens me, even after years of aircraft engineering, agricultural and food production engineering. This may be the start of a seemingly endless list of "less than intelligent questions about vehicle electrics, so please humour me"!
I have a Lucas 6V starter motor, AC14 is the only marking I can see apart from 25551.5 which I take to be the part number. There is a large threaded electrical connection halfway down the cylindrical body, but no sigh of other connections. There is no solenoid fitted to this starter motor.
What is connected to the large threaded portion and where are other connections? Over to you knowledgeable peeps.
Cheers, Tony.  |
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Penman
Joined: 23 Nov 2007
Posts: 4756
Location: Swindon, Wilts.
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| Posted: Thu Jun 01, 2017 12:10 pm Post subject: |
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Hi
Don't know the number but it sounds like it is a cable operated switch starter like this Austin 7 one.
Power in through the switch and out through the engine block.
_________________
Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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Kleftiwallah
Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire
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| Posted: Thu Jun 01, 2017 1:23 pm Post subject: |
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Nope! No gubbins like that on the underneath on mine. What has me flummoxed is a lack of two clearly electrical connections.
Could it be that the threaded bolt is for the power lead and the motor is earthed through the body and thus to the vehicle?
"Well there ya go", modern technology...
Cheers, Tony. |
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Kleftiwallah
Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire
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| Posted: Thu Jun 01, 2017 1:43 pm Post subject: |
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This is a general shot of the engine, pre-stripdown. The starter can be seen below the brass fuel tank.
Cheers, Tony. |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Thu Jun 01, 2017 5:18 pm Post subject: |
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| Kleftiwallah wrote: |
Could it be that the threaded bolt is for the power lead and the motor is earthed through the body and thus to the vehicle?
Cheers, Tony. |
Hi Tony,
A basic starter motor (i.e. without solenoid) does only have one terminal, the other being the casing.
The rest of what I'm saying here is unimportant but might give you a better understanding of the internals.
The motor internally is series connected, that is to say that the field coil and the rotating armature coils are connected in series. All the current passing through the armature also passes through the field coil so under heavy load the magnetisation of the field increases in proportion to the loading.
The motor will always rotate in the same direction regardless of which polarity is connected to it. If you needed to reverse the direction of rotation then you would need to reverse the ends of the field coil relative to the armature.
Peter
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http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Kleftiwallah
Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire
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| Posted: Thu Jun 01, 2017 5:28 pm Post subject: |
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Peter, you are a marvel! An easy to understand explanation indeed. Thanks a million. Watch out for other seemingly stupid questions!
Cheers, Tony.  |
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