# Motor not spinning

**URL:** <https://discuss.px4.io/t/motor-not-spinning/894>\
**Category:** PX4 Autopilot\
**Created:** [August 10, 2016, 9:55am UTC](https://discuss.px4.io/t/motor-not-spinning/894 "2016-08-10T09:55:16Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![cody](https://discuss.px4.io/letter_avatar_proxy/v4/letter/c/ecd19e/32.png) [@cody](https://discuss.px4.io/u/cody)\
**Post date:** [August 10, 2016, 9:55am UTC](https://discuss.px4.io/t/motor-not-spinning/894/1 "2016-08-10T09:55:16Z")

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I am using PX4 on a PixRacer with Standard AERT Plane airframe.  
When I arm it via RC and throttle up the Motor does not spin.  
The pulse width on the ESC pin changes from 900us to 1ms but then stays there.  
Flightmode is Manual.

It worked before so that may be a configuration problem.  
What could be the reason?

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**Author:** ![Andreas\_Hoffmann](https://discuss.px4.io/user_avatar/discuss.px4.io/andreas_hoffmann/32/3467_2.png) [@Andreas\_Hoffmann](https://discuss.px4.io/u/Andreas_Hoffmann)\
**Post date:** [August 10, 2016, 1:43pm UTC](https://discuss.px4.io/t/motor-not-spinning/894/2 "2016-08-10T13:43:54Z")

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If connected via USB / Telemetry to a GS, are there any Errors shown in the Log?

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**Author:** ![cody](https://discuss.px4.io/letter_avatar_proxy/v4/letter/c/ecd19e/32.png) [@cody](https://discuss.px4.io/u/cody)\
**Post date:** [August 10, 2016, 1:44pm UTC](https://discuss.px4.io/t/motor-not-spinning/894/3 "2016-08-10T13:44:46Z")

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There are no errors shown in QGroundControl.

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**Author:** ![Andreas\_Hoffmann](https://discuss.px4.io/user_avatar/discuss.px4.io/andreas_hoffmann/32/3467_2.png) [@Andreas\_Hoffmann](https://discuss.px4.io/u/Andreas_Hoffmann)\
**Post date:** [August 11, 2016, 7:06am UTC](https://discuss.px4.io/t/motor-not-spinning/894/4 "2016-08-11T07:06:24Z")

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Is there a Log File on the SD Card? If so could you check the Messages File and the Log? If there is no Log there was no successfull Arming Event.

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**Author:** ![cody](https://discuss.px4.io/letter_avatar_proxy/v4/letter/c/ecd19e/32.png) [@cody](https://discuss.px4.io/u/cody)\
**Post date:** [August 11, 2016, 5:23pm UTC](https://discuss.px4.io/t/motor-not-spinning/894/5 "2016-08-11T17:23:51Z")

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Yes there are log files on the SD card and there are no errors. According to the logs it does arm:

2016\_08\_07\_20\_11\_56: [blackbox] /fs/microsd/log/2016-08-07  
2016\_08\_07\_20\_11\_57: [blackbox] recording: 20\_11\_56.px4log  
2016\_08\_07\_20\_12\_03: DISARMED by RC  
2016\_08\_07\_20\_12\_04: [blackbox] stopped (1355 drops)  
2016\_08\_07\_20\_14\_28: DISARMED by RC  
2016\_08\_07\_20\_17\_27: ARMED by RC  
2016\_08\_07\_20\_17\_27: [blackbox] /fs/microsd/log/2016-08-07  
2016\_08\_07\_20\_17\_27: [blackbox] recording: 20\_17\_27.px4log  
2016\_08\_07\_20\_17\_37: DISARMED by RC  
2016\_08\_07\_20\_17\_39: [blackbox] stopped (1318 drops)  
2016\_08\_07\_21\_48\_16: DISARMED by RC

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<div class="post-metadata">

**Author:** ![cody](https://discuss.px4.io/letter_avatar_proxy/v4/letter/c/ecd19e/32.png) [@cody](https://discuss.px4.io/u/cody)\
**Post date:** [August 11, 2016, 6:38pm UTC](https://discuss.px4.io/t/motor-not-spinning/894/6 "2016-08-11T18:38:49Z")

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Ok i fixed the problem. Throttle was reversed somehow. I dont know how that happened.

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**Author:** ![theerasakoopp](https://discuss.px4.io/user_avatar/discuss.px4.io/theerasakoopp/32/7411_2.png) [@theerasakoopp](https://discuss.px4.io/u/theerasakoopp)\
**Post date:** [August 19, 2019, 1:01am UTC](https://discuss.px4.io/t/motor-not-spinning/894/7 "2019-08-19T01:01:44Z")

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Hi i have the same problem . How do you fixed it . I am newly . first time install QGC and pixhawk for airplane . i am not experiment.