STEPPERONLINE Nema 23 Integrated Servos, testing review, Weird Humming

These are pretty cool little servos that I wanted to test. I got the 90W and 180W nema 23. My only issue with these are they are not waterproof and I'm getting a strange hum.
https://www.amazon.com/STEPPERONLINE-Integrated-84-98oz-20-50VDC-Brushless/dp/B094CR1SS9?crid=17JI7ZY0UAFTU&keywords=nema+23+integrated+servo+motor&qid=1661320592&s=industrial&sprefix=nema+23+integrated+eservo+motor%2Cindustrial%2C114&sr=1-2&linkCode=ll1&tag=fintechcomm0f-20&linkId=bcc933c5c1f948954a838361b7e016d7&language=en_US&ref_=as_li_ss_tl
https://www.amazon.com/Integrated-3000rpm-63-73oz-20-50VDC-Brushless/dp/B09BVGGS57?crid=17JI7ZY0UAFTU&keywords=nema+23+integrated+servo+motor&qid=1661320821&s=industrial&sprefix=nema+23+integrated+eservo+motor%2Cindustrial%2C114&sr=1-4&linkCode=ll1&tag=fintechcomm0f-20&linkId=d4122b7efe2b46aa79dc0fbfdc630f82&language=en_US&ref_=as_li_ss_tl