What is the difference between mechanical gears and magnetic gears?


Pros of mechanical gear	VS	Pros of magnetic gear
1. Very high torque/mass (specific torque)		1. Non-contact
2. Very high efficiency		1.1 No lubrication
3. Mature technology		1.2 Low maintenance
		2. Easily integrated in electric machines
		3. Potentially low vibration
Cons of mechanical gear	VS	Cons of magnetic gear
1. Contact-related wear failure		1. Unknown limits on specific torque efficiency
1.1 Requires lubrication system(s)		2. Magnet temperature limit
1.2 Routine costly maintenance		3. Individual magnet interaction weaker than 1 gear tooth pair
2. Strong tonal vibration cabin noise