http://zeromanual.com/history/Motor_Whirring?feed=atom&Motor Whirring - Revision history2024-03-29T12:17:16ZRevision history for this page on the wikiMediaWiki 1.27.0http://zeromanual.com/index.php?title=Motor_Whirring&diff=6179&oldid=prevBrianTRice: new category2020-03-31T20:45:12Z<p>new category</p>
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The [[Z-Force Motor|motor]] on 2013+ models makes a white noise sound at very slow speeds when rotated (by the wheels or shaft).<br />
: This is also described as a "whirring sound".<br />
: This is alluded to by the term "[[wikipedia:Cogging torque|cogging]]".<br />
: This is normal as long as it sounds like white noise and occurs as described below.<br />
<br />
;Video Guide<br />
* [https://www.youtube.com/watch?v=UtKvr9d35VU Strange noise Zero DS 2017] provides a reference for comparison:<br />
*: {{#ev:youtube|UtKvr9d35VU}}<br />
<br />
;Related Confirming Symptoms<br />
* The noise should ''only'' occur while the motor is rotated by external input (pushing the bike around or rotating the shaft).<br />
* The noise should ''not'' while under power (when the motor is driving its own rotation).<br />
* The bike should gently resist being pushed while the noise is audible.<br />
<br />
;Causes<br />
* The direct cause is the [[Gen2/Motor Controller|controller]] applying a white noise field to the motor at very slow speeds.<br />
* At least one connected battery's [[Main Contactor|contactor]] ''must'' have been engaged for this to occur.<br />
*: This can occur while keyed on, or while charging.<br />
<br />
;Effects<br />
* There are no detrimental effects, when the sound occurs by design.<br />
* The purpose is for the [[Gen2/Motor Controller|controller]] to detect and maintain precise knowledge of the motor's rotor angle.<br />
* This ensures that, if the throttle demands operation, the controller will apply the field correctly to the rotor.<br />
* You may infer that ''at least one contactor is engaged'' to power the controller.<br />
* If the bike is keyed on, you may infer that the motorcycle should be ready to drive.<br />
*: (aside from the [[Kickstand Switch|kickstand]] and [[Kill_Switch|kill switch]] safety interlocks).<br />
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[[Category:Motor Sound]]</div>BrianTRice