What are between motor and mechanical transmission way?

(1),the back wheel direct drive;(2),belt drive;(3),gear transmission;(4),worm drive; (5),chain;6,friction wheel electric motor 12v 500w transmission.What inspection tour the running transformer should do?(1),voice is normal;(2),check whether there is any oil leakage,oil leakage on the ac electric motor transformer,the color of the oil and oil level is normal;(3),current and temperature of the transformer is more than permitted;(4),transformer bushing,clean,ac induction motor 110kw do you have any damage crack and discharge; (5),transformer grounding are www.dongfeng-motor.com in good condition.What methods of transformer dry processing?(1),induction heating method;(2),hot air drying;(3),oven drying method.