
4. AC LINE FILTER AND SEPARATE
REGENERATIVE DISCHARGE UNIT
B–65192EN/02
22
The amount (R) of regenerative discharge of a motor is the sum of P and
Q calculated in Section (i) and (ii), respectively.
(1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
R + P ) Q[W]
(i) Horizontal operation
Amount of regenerative discharge (power [W] ) with a rapid–traverse
acceleration/deceleration frequency of one per F seconds
SI system of units
P +
1
F
(5.48 10
*3
JVm
2
* 5.23 10
*2
ta Vm TL) [W]
(2). . .
where
F: Rapid–traverse acceleration/deceleration frequency
(sec/occurrence)
CAUTION
Unless otherwise specified, ”once per five seconds” is
assumed.
J: Jm + JL
Jm: Inertia (kg · m
2
) of the motor rotor
JL: Load inertia (kg · m
2
) in terms of motor shaft inertia
Vm:Motor speed (min
–1
) for rapid traverse
ta: Rapid–traverse acceleration/deceleration time (sec)
TL:Machine friction torque (in terms of motor shaft torque) (N · m)
CGS system of units
P +
1
F
(5.37 10
*4
JVm
2
* 5.13 10
*3
ta Vm TL) [W]
(3). . .
where
F: Rapid–traverse acceleration/deceleration frequency
(sec/occurrence)
CAUTION
Unless otherwise specified, ”once per five seconds” is
assumed.
J: Jm + JL
Jm: Inertia (kg · cm · sec) of the motor rotor
JL: Load inertia (kg · cm · sec) in terms of motor shaft inertia
Vm:Motor speed (rpm) for rapid traverse
ta: Rapid–traverse acceleration/deceleration time (sec)
TL:Machine friction torque (in terms of motor shaft torque) (kg · cm)
4.2.1
Calculating the
Amount of
Regenerative
Discharge