Hey Rob, First, I would check both of the capacitors just for good measure. There should be a centrifugal switch to remove them from circuit when the motor reaches running speed. I'm not very familiar with larger motors so I don't know about what the spring tension should be on the switch contacts. Since motor windings are essentially transformers, when a transformer in a microwave oven is 'inductively' shorted it almost always takes 3 seconds to blow the line fuse in the microwave oven. The overload on the motor itself, I believe, is a thermal type rather than a current sensing type. Hopefully, you can contact the motor manufacturer or a local motor repair shop to find out what the winding resistance(s) should be. Good luck!! PS. I thought of dry bearings but this unit looks like it just came out of the box..
Answers & Comments
Hey Rob,
First, I would check both of the capacitors just for good measure. There should be a centrifugal switch to remove them from circuit when the motor reaches running speed. I'm not very familiar with larger motors so I don't know about what the spring tension should be on the switch contacts. Since motor windings are essentially transformers, when a transformer in a microwave oven is 'inductively' shorted it almost always takes 3 seconds to blow the line fuse in the microwave oven. The overload on the motor itself, I believe, is a thermal type rather than a current sensing type. Hopefully, you can contact the motor manufacturer or a local motor repair shop to find out what the winding resistance(s) should be. Good luck!!
PS. I thought of dry bearings but this unit looks like it just came out of the box..
Dave