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| Brushless DC Motor Spindle by c raynerd |
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| HS93:
normally there is a circlip on what is the prop end and then a grub screw in the back Of the outer ring I use them a lot in boats and have had them apart quite a lot , I wonderd about a pre load but after looking at the way they arrived with a small gap between the circlip and the washer in front of the bearing I have gone with that what happens in a plane use is the the prop would push the shaft back and take up any slack this in turn just moves the out magnet ring back. I have been using some of the new and bigger motors and just built some mounts with cooling for a mate replaning the 5mm shaft with a 5 mm prop shaft so no couplings, we are also using one of the scorpion motors that are 450 watts through a belt drive that is a right beast. be aware that these motors require cooling they are normally cooled by a whacking great prop or in the boats case a heat sink and water they tend to get the heat welling up after turn off and concentrating on the front cover getting very warm we have a pump to keep cooling the motor after a run for a few min this has worked well, but we are pushing it a bit. the boat is 7kg cheap uk supplier http://www.giantcod.co.uk/brushless-motor-c-25.html Peter |
| HS93:
have you thought of a bearing and a thrust bearing. Peter |
| raynerd:
I appreciate all your advice. Can I just clarify, does there just need to be tension applied to the bearings or does the spindle need to applying the tension on the bearings itself? I`m not clear... Chris |
| David Jupp:
There needs to be pre-load in you want to eliminate end float of the spindle. There are alternative ways to achieve this which can put spindle in tension or compression. The strain may be localised rather than applied to the bulk of the spindle. You will likely want to consider the effects of thermal expansion on the arrangement for giving the pre-load. |
| Noitoen:
They sell pairs of matched angular contact bearings. The "stiffness" will be right next to the spindle with no expansion problems. |
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