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All Forums >> Electric Aircraft Universe >> Electric General Discussion >> Electric motor
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Electric motor - 7/22/2008 6:59:12 PM   
kgv


 

Posts: 1
Joined: 6/21/2006
From: albany, NY, USA
Status: offline 		Can an electric motor slow down from use over time? How do you check an electric motor to see if it is running right?
       Post #: 1

RE: Electric motor - 7/22/2008 7:20:11 PM   
BeanerECMO


 

Posts: 232
Joined: 5/20/2005
From: Springfield, VA, USA
Status: offline 		Is it brushed or brushless? The brushes in a brushed motor will wear just as they would in a generator or 'normal' electric motor, as the commutator on the axle of the armature will, too. If something has occurred in a brushless motor for some of the poles to have a lower magnetization or become demagnetized, that could have an adverse effect. In either case, disassemble the motor, do some cleaning, reassemble and run it on a fresh battery.

(in reply to kgv)
       Post #: 2

RE: Electric motor - 7/23/2008 1:22:31 PM   
whitecrest


 

Posts: 86
Joined: 8/8/2007
From: Orleans, MA, USA
Status: offline 		Also, be sure to check the bearings for excessive play, wear or binding. If your motor uses bushings, a little oil there might do the trick. If your motor uses ball bearings, they might need to be replaced if they have worn out.

Ideally, the only thing you want slowing your motor down is the load imposed by the propeller. It must turn fast enough to generate enough back EMF to prevent itself from becoming a short circuit.

As mentioned many times, a wattmeter or DVM is a very useful tool for electric flight. You can measure your motor's no-load current (no prop) and compare that reading to the manufacturer's specification. If they are in fairly close agreement, you know your motor is probably in good shape.

< Message edited by whitecrest -- 7/23/2008 2:18:32 PM >

_____________________________

Some things that count can''t be counted, and some things that can be counted don''t count. << A.E.

(in reply to kgv)
       Post #: 3

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