TEAMYAKIMA Posted July 20, 2015 Share Posted July 20, 2015 Does anyone know of a source of very small stall motors - the smaller the better - 10mm or smaller is ideal.... are there such things? PAul Link to post Share on other sites More sharing options...
DCB Posted July 21, 2015 Share Posted July 21, 2015 What is a stall motor? There are some small motors in various CD/ CD ROM drives which I have used on 12 volts but I am not sure what a "Stall Motor" is Link to post Share on other sites More sharing options...
TEAMYAKIMA Posted July 21, 2015 Author Share Posted July 21, 2015 My understanding of a stall motor is a coreless micro-motor which can be 'stalled' when used with a suitable resistor. For example .... these are used as point motors , so that the motor turns a very small amount and when the tie bar reaches its end of travel the motor 'stalls' I'm sure I haven't described it correctly, but eg a Tortoise point motor is basically a stall motor inside a box. Link to post Share on other sites More sharing options...
billbedford Posted July 22, 2015 Share Posted July 22, 2015 You can use any small motor to do this. You just have to ensure that the heat generated by the continuous current is properly dissipated, i.e. you will need to use a heatsink on the motor. Link to post Share on other sites More sharing options...
chaz Posted July 22, 2015 Share Posted July 22, 2015 You can use any small motor to do this. You just have to ensure that the heat generated by the continuous current is properly dissipated, i.e. you will need to use a heatsink on the motor. What you say is quite true but not the full story. If the current draw of the motor is very low (as in a Tortoise - about 30mA I believe) no heatsink is required. The heating effect is the square of the current times the resistance (I2R). R is quite small in most motors so providing I (the current) is also small the heating effect can be ignored. As Paul is after a very small motor I guess that he won't want to make it bigger with a heat sink (although if the model is metal it might well be its own heat sink). Of course any motor that has a very low current need is going to lack power, a physical limitation that can't be evaded - a Tortoise gets round this by being geared very low. Whether this is a problem depends on what you want to drive with the motor. I hope that's some help. Chaz PS Googling "very small motor" will find you a lot of tiny little motors some of which are very cheap and could therefore be experimented with without putting the wallet at too great a risk. One snag to tiny motors is that they usually run at very high revs. Link to post Share on other sites More sharing options...
Catweasel Posted July 22, 2015 Share Posted July 22, 2015 http://www.nigellawton009.com/6V6mmx10mmMicroMotors.html Maybe this is the kind of thing you're looking for. Link to post Share on other sites More sharing options...
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