PY Manual
Copyright © 2006 SANYO DENKI
AMERICA
, Inc.
130
Dynamic Brake
The PY servo amplifier is designed with an internal dynamic brake for stopping. The
brake is activated when an alarm is detected. The following explains the dynamic brake
characteristics and allowable operating frequency.
N
Motor speed [RPM]
J
M
Motor inertia [kg m
2
]
J
L
Load inertia [kg m
2
]
T
L
Load torque, acting to slow the motor [N m]
ω
1
Distance
traveled
during
processing delay (assume T
L
=0)
ω
2
Distance travel while slowing from N to a stop (assume T
L
=0)
ω
3
Reduction in distance traveled as a result of a load torque T
L
ω
t1
ω
t2
Total
distance
traveled [revolutions]
α
Motor
Constant
β
Motor Constant
Stopping Time
ω
1
2
π
N
.
t D
.
60
ω
2
J M J L
α
N
.
β
N
3
.
.
ω
3
J M J L
2 T L
.
2
π
.
N
.
60
2
.
No Load Torque
With Load Torque
ω
t1
ω
1
ω
2
ω
t2
ω
1
ω
2
ω
3
.
ω
2
ω
3
N
0
Time
Speed
ω
1
ω
2
t
D
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