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jimforrest
Joined: 17 Jul 2015 Posts: 7
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Posted: Fri Jul 17, 2015 3:57 pm Post subject: 1934 Daimler 20hp Dynamo Query |
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Hello people - new chap here. Although I am a Jaguar man (I have three- 2x XJ8's and an XK8), I am helping a friend renovate/restore a 1934 Daimler LQ. She's a classic 'old Rolls' shape with a 6 cylinder longstroke engine, spare wheels on the running boards, and a Wilson pre-select gearbox.
Most of the chassis work is complete now, and the engine is also running (it was rebuilt 20 years ago and then immediately put in storage!) However, it has a peculiar dynamo design that we'd like a little help on. The dynamo is driven by a three belt pulley and bolted to the engine with the water pump driven off the rear of the armeture shaft. Inside it has only two brushes and they are spaced at approx 90 degrees. We have only either seen 2 x 180 degrees, or a three brush system. Can anyone point us towards any information on this design of generator? I can't find anything on the subject so we don't know how to wire it up. (The electrics are 12V by the way).
The car's wiring has mostly been removed (by previous owner), but the voltage control box is still fitted on the bulkhead. However, it is beyond salvage! Can anyone say if this two brush system could be connected to a modern solid state regulator hidden inside the old regulator casing? |
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peter scott
Joined: 18 Dec 2007 Posts: 7119 Location: Edinburgh
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Posted: Fri Jul 17, 2015 11:17 pm Post subject: |
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Hi Jim,
I haven't come across a dynamo with this brush arrangement either and I don't know why it was used but I'd be inclined to assume that it is nothing more than a strange way of wiring the commutator. I would just try connecting its armature to the D terminal and field to the F terminal of a simple CVC regulator such as RB95 and see whether it does sensible things on the ammeter.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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jimforrest
Joined: 17 Jul 2015 Posts: 7
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Posted: Sat Jul 18, 2015 12:27 am Post subject: |
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Last time someone said - 'I'd just try ...... ' I spent 3 hours in A&E!
Mind you - not a lot of options really. I'll tell my friend to do it (hehe). |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22449 Location: UK
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DM
Joined: 21 Dec 2008 Posts: 212 Location: North Cornwall
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Posted: Sat Jul 18, 2015 9:30 am Post subject: |
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"Modern Motor Repair and Overhauling" book lists the dynamo as -
Model AT101
12V
12 amps at full output speed
Cut in speed 530 rpm
Full output speed 1250 rpm
Earth return
Anticlockwise rotation |
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peter scott
Joined: 18 Dec 2007 Posts: 7119 Location: Edinburgh
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Posted: Sat Jul 18, 2015 11:31 am Post subject: |
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It looks as if the 90 degree brush arrangement stems from having previously been a 3 brush dynamo. Just ignore this and connect it to a normal field regulator.
Peter
Lucas dynamo from a 1934 four cylinder BSA 3 wheeler converted to 2 brush and 12v operation
_________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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jimforrest
Joined: 17 Jul 2015 Posts: 7
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Posted: Sat Jul 18, 2015 3:55 pm Post subject: |
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Thanks chaps - but the anti-clockwise rotation is not correct. See the pics -
'A normal field regulator' - do you mean from an ordinary 180 deg two brush dynamo? |
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jimforrest
Joined: 17 Jul 2015 Posts: 7
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Posted: Sat Jul 18, 2015 4:09 pm Post subject: |
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It's worth noting that Daimler built (primarilly) lorries and busses at that time. So this is probably a bus engine! |
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peter scott
Joined: 18 Dec 2007 Posts: 7119 Location: Edinburgh
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Posted: Sat Jul 18, 2015 5:07 pm Post subject: |
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jimforrest wrote: |
'A normal field regulator' - do you mean from an ordinary 180 deg two brush dynamo? |
Hi Jim,
Yes, just so. I think I see two connections on the dynamo. If there is no indication which is the armature connection and which the field then just do a continuity check from the non-earthed brush and the lower resistance one will be the armature.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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jimforrest
Joined: 17 Jul 2015 Posts: 7
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Posted: Sat Jul 18, 2015 6:04 pm Post subject: |
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Cheers Peter. We'll give it a try. My friend is off to Beaulie autojumble (next month I think) so he can try to pick up a 'period' regulator. |
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captain bobo
Joined: 02 Feb 2012 Posts: 43 Location: South West Cambs
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Posted: Fri Oct 23, 2015 10:02 pm Post subject: |
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The arrangement that you show is the same as the arrangement on my 1937 Daimler 15 Sports Saloon. I believe that all Daimler 15's, which were built from 1934 to 1937, had this arrangement of driving the dynamo via the water pump.
By now you will, I suspect, have discovered that the wiring is relatively straightforward as a 2 brush system.
Best wishes, Dave B _________________ 1937 Daimler 15 Mulliner Sports Saloon & 1969 Daimler V8 250 Saloon |
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captain bobo
Joined: 02 Feb 2012 Posts: 43 Location: South West Cambs
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Posted: Fri Oct 23, 2015 10:04 pm Post subject: |
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Whoops! I meant "drive the water pump via the dynamo".
Dave B _________________ 1937 Daimler 15 Mulliner Sports Saloon & 1969 Daimler V8 250 Saloon |
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