Electric motor installation 1

Electric motor components set up in situ to check all OK before final installation.

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Comment by Peter Snowdon on February 1, 2017 at 9:42

Hi Chri - I'm using the original 11x9 RH prop. I could have changed the pitch but it is simpler and cheaper to play with the sheave ratio.When I designed this system there was very little info or components available and I went with a 24v system because anything to do with 48v costed a fortune if you could find it.I don't have any Alltax components,the main and changeover contactors are Albright.The controller is a Curtis 1205.I'll keep you informed as to what happens in spring (if it ever happens here)when she goes back in the water

Comment by Chris Green on January 31, 2017 at 22:28

Hi Peter - what size prop and pitch are you running? Looks like the original 3 bladed from your blog photos. I am going to try her out in harbour on the 2.8:1 ratio settings as these are the recommended set up from Lynch. and if required will change the pulley ratios, maybe 2:1. My last Atalanta with a similar power output from a Mitsubishi diesel engine and a similar size /pitch folding prop was easily driven at hull speed at around 1200 rpm with occasional bursts of higher rev's for stopping and manoeuvring etc. I am hoping for a similar performance - mostly for mooring etc. By the way - Salizanda is looking great! NB: I see you have a Curtis controller with some Alltrax components - I have an Alltrax SPM control and components - see attached.

Comment by Peter Snowdon on January 31, 2017 at 19:05

Hi Chris - I've set mine as a 24v system rated about 2000rpm and had a 2:1 reduction but I'm changing that to approx 1:1 because I realise that I need a shaft rpm of about 1850rpm.That would match the shaft rpm produced by the original gas engine.I think it was a Watermota.My motor is a lot smaller than yours with a peak output of 5.0 kw.

Comment by Chris Green on January 31, 2017 at 16:37

Hi Peter - Reduction is linked to the power curve of the motor i.e. rated rpm at around 2600 rpm - this set up produces 8.5kW (rated output) with peak of 16 kW and rated torque of 31.5 Nm. This is running at 48V. It is possible to run a direct shaft drive, this would be a 24V set up, but due to the lower rpm would generate less than half the power of the higher revving setup. Still probably okay for an Atalanta though and I did seriously consider the lower powered option. 

Comment by Peter Snowdon on January 31, 2017 at 16:04

Nice installation Chris. Why did you decide on this reduction? What will be the shaft RPM and at what voltage are you opperating?

Comment by Nick Phillips on January 29, 2017 at 10:42
Chris, looking good. So tidy and so much room! Can't wait to hear how she performs.
Comment by Chris Green on January 29, 2017 at 9:43

Photos of initial electric motor setup.

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