Technical Data
ANCA Motion
DS619-0-00-0019 - Rev 0
173
12
Once the kinetic energy in the system is found, the voltage rise due to the energy on the bus
capacitance can be found:
(
)
Where V = voltage in V,
E = Energy in Joules,
C = Capacitance in Farads
The power dissipated in the regeneration resistor(s) additionally depends on how often the user is stopping the
torque output of the motor. For example, if the drive is operating in torque mode and a torque command is set to
0 from a non-0 value then the power dissipated is the kinetic energy in the system multiplied by the number of
times per second the drive is going from this set point to 0 again.
Example 1:
Servo Motor &
Pulley
Pulley Ratio = 5
Load (Grinding Wheel,
Flywheel etc.)
Pulley to Drive Load
The servo motor drives a load via two pulleys. The ratio is 1:5 from motor to load to provide a slower speed but
higher torque.
Assuming the belt has negligible stored energy compared to the rest of the system and the load is rotational:
J
eff
(effective moment of inertia) = J
motor
+J
motor pulley
+
(J
load pulley
+ J
load
)
The energy stored in the system at the time the torque set point is reduced to zero is:
(For the inbuilt brake resistors, this value must not exceed 24.7Joules for AMD2000 3A drive and 143J for
AMD2000 9 A drive.)
The rise in voltage in this example is then
(
)
Example 2:
The situation in example 1 has torque applied and then stopped twice per second. The power required for the
regeneration resistor to dissipate all of the energy is
