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Servo moves very slowly on long movements

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Posted at 2018-6-6 08:07:26 | All floors |Read mode
Last edited by Raxius In 2018-6-6 08:56 Editor

Ihave an LD-20MG servo motor that I'm trying to control with an arduino. My code is using the normal arduino servo library and when commanding the servo to move in small increments, it moves fine, but when I command it to move more than ~30 deg, it moves incredibly slow; ~1-2 deg/sec until it completes the movement. I've checked the voltage with a multimeter and I can confirm that it's getting 7.38V and my power supply is providing 18.5V at 3.3A stepped down to that 7.38with an LM317T variable voltage regulator, so current shouldn't be a problem. Does anyone have any suggestions or insights about what's going on, or how to fix this problem? Is this just a defective servo?

Thanks in advance

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Posted at 2018-6-7 09:38:38 | All floors
Hi, thank you for bringing this matter to our attention, I'm glad to assist you.

Can you take photos show the wiring and battery? It's more helpful for us to find root cause.

You can also email us at support@lewansoul.com
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 Author| Posted at 2018-6-8 01:18:40 | All floors
Last edited by Raxius In 2018-6-8 01:21 Editor
admin Posted at 2018-6-7 09:38
Hi, thank you for bringing this matter to our attention, I'm glad to assist you.

Can you take photo ...

Here are links to the pictures
Wiring;

https://drive.google.com/open?id ... EshR_Zcrxla1j82BkKP

The LM317 is outputting 7.38V and is rated at 1.5A


Power Supply; 18.5V at 3.33A from wallhttps://drive.google.com/open?id ... fQIm7B2el-dZEeWmzdw



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Posted at 2018-6-8 20:02:08 | All floors
Raxius Posted at 2018-6-8 01:18
Here are links to the pictures
Wiring;

Thank for your patience, our engineer analyzed the photos and gets the conclusion: The issue is caused by the power supply not the servo. Our LD-20MG servo need at least 1 amp, and its working current will reach up to 2amps when fast rotate, the LM317 only provide 1amp current, sometimes only 800mA. So plesae don't use the LM317 to control servo, and the power wire also will affect the current, so please use short and thick power cable, Don't let the power cord go around.
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