7. New Concept of Robotic Joint Actuation
External Torque: t
Displacement:q
O
External Torque: t
Displacement:q
O
External Torque: t
Displacement:q
O
SEA VSA New Concept
- Actuation system with springs and a preload mechanism
- Realize elastic behavior for safer human-robot interactions
and rigid behavior for high control performance
8. Variable Mechanical Fuse, VMF
External Force: F
Displacement:qO
rigid elastic
threshold
exll
lm
fDJ
fDJ
tqq
tqqq
,
,
,
,sgn
,
pp
lp K
f
tt
qqt
q
0
0
q
q
motor
q
Jm
link
f
Jl
Kl
Dl
t
tex