Author Topic: Standard convention for motor shaft directions?  (Read 2722 times)

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Offline InfravioletTopic starter

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Standard convention for motor shaft directions?
« on: December 12, 2023, 07:12:33 pm »
Is there a convention for which way the rotation of a motor's shaft is considered "+" and "-"? If it is based on clockwise vs anticlockwise, then would anti-clockwise mean a "right hand screw rule" with the thumb pointing from the motor's body out along the shaft, or would it be interpreted with the thumb pointing from the shaft's tip down towards the motor body?

Or is this choice of which direction is positive something that varies between different manufacturers of servos, gearboxes, motors...

I've been designing a few moving mechanisms and want to check which is the right way to describe the right (or left) way when I write up documentation.

Thanks
 

Online langwadt

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Re: Standard convention for motor shaft directions?
« Reply #1 on: December 12, 2023, 07:26:16 pm »
 
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Offline jpanhalt

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Re: Standard convention for motor shaft directions?
« Reply #2 on: December 12, 2023, 08:19:46 pm »
Positive (+) rotation is CCW and - is CW.  Think of a graph in the 1st quadrant.  The angle increases with CCW rotation.  That is also consistent with the notion that left handedness is sinister (S in chemistry).  BTW, most propellers on small American airplane turn CCW from the front.  British airplanes were usually reversed.  Hence the need to apply right rudder in American airplanes during takeoff, particularly with single-engine versions.
 

Offline liaifat85

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Re: Standard convention for motor shaft directions?
« Reply #3 on: December 15, 2023, 06:54:06 am »
You can check this out too:
 

Offline InfravioletTopic starter

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Re: Standard convention for motor shaft directions?
« Reply #4 on: December 15, 2023, 04:59:52 pm »
Thanks, with langwadt's like plus jpanhalt's info it would seem that if a motor is behind a clock face with the shaft poking out of the clock, then the positive direction would have the hand going anti-clockwise.
 


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