Specifications

101
Supplements
Formula for Calculating Motor Capacity
Symbols (For P.94)
Rotary motion
Linear motion
Motor
NM
GD
2
M
Vƒ
Tƒ
Nƒ
W
Motor
NM
GD
2
M
PMMotor shaft output required for the loadkW
PORunning power kW kW
TMMotor rated torque Nm kgm
TL
Load torque (reflected to motor shaft)
Nm kgm
T
ƒLoad torque (load axis) Nm kgm
PMMotor rated output kW kW
NMMotor rated speed min
-1
rpm
NƒLoad axis rotation speed min
-1
rpm
NMMotor axis rotation speed min
-1
rpm
VƒLoad speed mmin mmin
WMass of load kg kg
(SI Units) (MKS Units)
Gear efficiency
µ
Friction factor
J
MMotor moment of inertia kgm
2
kgm
2
J
L
Load moment of inertia (motor axis)
kgm
2
kgm
2
J
ƒ
Load moment of inertia (load axis)
kgm
2
kgm
2
T
AAcceleration torque Nm kgm
T
BBraking torque Nm kgm
t
aStarting time s s
t
dBraking time s s
¡
Accel torque factor(1.0 to 1.5)
Regenerative braking factor, without braking resister(Less than 0.2)
             with braking resister(0.3 to 1.5)
(SI Units) (MKS Units)
Motor efficiency (normally, approx. 0.85)
cosφ: Motor power factor (normally, approx. 0.75)
VMMotor voltage [V]
IMMotor current [A]
(current with commercial power supply)
k
Correction factor calculated from current distortionCorrection factor calculated from current distortion
factor (1.0 to 1.05, depending on the PWM method.)factor (1.0 to 1.05, depending on the PWM method.)
NMMotor rotation speedmin
-1
PC1Continuous capacity〔kVA〕
k
S
Motor starting current/motor rated current
n
T
Number of motors in parallel
n
S
Number of simultaneously started motors
GD
2
Total (GD
2
) reflected into motor shaftkgm
2
tAMotor acceleration time
TLLoad torqueNm
SI Units (International Units)
T
M = × 10
3
Nm
MKS Units (Gravimetric Units)
SI Units (International Units) MKS Units (Gravimetric Units)
60 PM
2πNM
TL =    Nm
9.8
µ
WVƒ
2πNM
9.8
µ
WVƒ
60
Po = × 10
-3
kW
T
A
TLNm
kgm
2
JM JLNM
ta
TB
-
TLNm
JM JLNM
td
J
L
(  
2
Nƒ
NM
J
L
W
(   
2
1
4
1
4
GD
2
L
J
ƒ
Vƒ
π NM
W
(    )
2
Vƒ
π NM
Vƒ
NM
W0.1013
( )
2
TMkgm
974PM
NM
TL =   kgm
µ
WVƒ
2πNM
POkW
µ
WVƒ
6120
TA
TL
kgm
kgm
2
GD
2
M GD
2
LNM
375 ta
-
TL
kgm
GD
2
M GD
2
LNM
375 td
TB
GD
2
L
(   )
2
GD
2
ƒ
GD
2
L
Nƒ
NM
TM = × 10
3
Nm
60PM
2πNM
TL Nm
N
ƒ
Tƒ
NM
TƒNƒ
PO × 10
3
kW
2π
60
t
a
kgm
2
t
d
J
L
(  
2
Nƒ
NM
J
ƒ
TMkgm
974PM
NM
PO kW
T
ƒ NNƒ
974
t
a
s
kgm
2
GD
2
M GD
2
LNM
375
¡
TM TL
t
d
GD
2
L
(   )
2
GD
2
ƒ
Nƒ
NM
s
GD
2
M GD
2
LNM
375 TM TL
J
M J
LNM
¡
TM TL
s
2π
60
2π
60
2π
60
J
M J
LNM
TM TL
s
2π
60
TL kgm
N
ƒ
Tƒ
NM