alt Hacker NewsHow does a microwave without a rotating tray even work?
Most microwaves only have the magnetron (the part actually producing the microwaves) on one side. The rotation is needed to cook your food evenly.
This is why food in the middle of the tray often ends up undercooked. No matter how the tray rotates, that part is never particularly close to it.
These commercial microwaves have a ceramic tray (transparent to microwaves) that the food sits on. It fills the entire bottom of the microwave. Underneath the tray is a small piece of metal bent into a particular shape attached to a spindle that rotates. The idea being that it spins around the reflected microwaves rather than the food itself.
For a visual aid, these are pictures of the replacements parts: https://www.partstown.com/panasonic/PANA010T8K10AP https://www.partstown.com/panasonic/PANF202K3700BP