I understand @peter.park.KLAUDIO point by putting fluid inside the platter. He tries to minimize cogging and smooth out speed correction because of high torque but IMHO fluid is not the best solution. IMHO a better solution is using slip rings. A couple of rings with different radiuses located inside the platter can minimize side effects of torque of motor. Each ring will be a bearing for the bigger one. It requires precise machining and a lot of testing for deciding size of the rings and number of the rings. Think it like a ball bearing with 3 or more rings but no balls.