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Motor to Generator operation Controller | 5 comments (5 topical, editorial)

Re: Motor to Generator operation Controller (3.00 / 0) (#1)
by wdyasq on Fri May 16th, 2008 at 11:11:58 AM MST
(User Info)

Bosch built a version of this called the "Dynastart" using a conventional generator instead of a PM unit. Amongst mechanics it had the enduring term 'Damnastart', mostly due to the problems with the regulators and relays.

There are diagrams on the internet that show how they are wired and how they worked.

I can think of several ways to assure the engine would be running with oil pressure before the 'starter' dis-engaged and also assure proper shutdown if things were not working as planned. Oil-pressure activation, voltage reading and over-temperature switches should be employed.

Ron
Adventure is just bad planning." -- Roald Amundsen

Re: Motor to Generator operation Controller (3.00 / 0) (#5)
by Simen on Tue May 27th, 2008 at 01:21:04 PM MST
(User Info) http://www.mwlmf.net

I have one of those on my vintage(1958) 12hp 2cyl gasoline engine in my wooden boat... ;)

It's not the strongest of starters but works ok, and delivers a charge of max 11Amp. (There is an 20Amp available too i think...) I'm not sure of the power as a starter, but i think it draws around 50-60Amp.
The regulator is an mechanical variant, and is not suited in a humid enviroment like a wooden boat (hence the nickname Damnastart... :D ), but there are seldom any problems with it as long as the regulator are kept dry.

The problems starts after the boat has been at the bottom once, and the starter system didn't get a proper overhaul... :D (I speak of experience... :D )

As a dynamo, the dynastarter thrives at 3000-3500rpm, which is easily archieved on these old engines with big flywheels. The flywheel on my engine is approx. 15", and the wheel on the dynastarter is approx. 3.5" (4.25:1 ratio); running speed of the engine is around 750rpm.

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Motor to Generator operation Controller | 5 comments (5 topical, 0 editorial)

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