Fagor Compact Drives and Motors Quick Reference. Ref.1910 CQR-3/56
SYNCHRONOUS MOTORS
ELECTRICAL CHARACTERISTICS
Electrical limitations for a synchronous motor
1. Curves for torque limitation by voltage depending on type of stator
winding.
2. Curve for thermal torque limitation in continuous duty S1 (100 K)
with fan where T=100 K at the winding.
3. Curve for thermal torque limitation in continuous duty S1 (100 K)
without fan where T=100 K at the winding.
4. Maximum turning speed limitation (in voltage) Nmax.
5. Voltage saturation curves.
Electrical limitations for a motor-drive combination
ZONE 1. Is the permanent duty area (S1 duty) and it is delimited by
the stall motor torque and the torque at rated speed.
ZONE 2. Is the intermittent duty zone.
DEFINITIONS
Mo. Stall torque. Maximum torque that the motor can supply when the
rotor is locked and is thermally limited by the temperature increase at
the stator winding (T=100 K). This torque is available for a zero rotor
turning speed for an unlimited time period. The stall torque Mo is
always greater than the rated torque Mn.
Io. Stall current. Current circulating through each phase of the stator
winding required to generated the stall torque Mo. This current can
circulate for an unlimited time.
Mn. Rated torque.Torque that the motor can supply continuously at its
rated speed and is thermally limited by the temperature increase at
the stator winding (T=100 K).
In. Rated current. Current circulating through each phase of the stator
winding required to generated the rated torque Mn.
Pn. Rated power. Power available at rated speed and rated torque. Its
value is given in watts by expression: Mn·nN/9550 where Pn (in kW),
Mn (in N·m) and nN
(in rev/min).
Nmax. Maximum speed. Rotor turning speed limitation due to
electrical restrictions (voltage limits). Note that the maximum value for
this speed is shown in the torque-speed curves given in this manual.
Mp. Peak torque. Maximum torque (limited by current) generated by
the maximum Ip current allowed at zero speed. It is available for
dynamic operations such as accelerations, ... The value of this current
is always limited by the control parameter (CP20) in face of the risk of
exceeding the destruction temperature of the insulation of the stator
winding.
tac. Acceleration time. Time it takes the motor to accelerate from zero
speed to its rated speed with maximum torque.
kt. Torque constant. Torque generated according to the current
supplied. Its value may be calculated with the division of the stall
torque by the stall current (Mo/Io).
nN. Rated turning speed.
Pcal. Power value given by the expression: Mo·nN/9550 where Pcal
(in kW), Mo (in N·m) and nN
(in rev/min).
R. Value of the resistance of a phase at an ambient temperature of
20°C/68°F. The stator winding has a star configuration.
L. Value of the inductance corresponding to a phase when using 3-
phase power supply. The stator winding has a star configuration.
J. Rotor moment of inertia.
P. Mass.
WARNING. Note that this data is valid for ambient
temperature or an average cooling temperature of
40°C/104°F.
0
1200
0
Speed
N (rev/min)
Torque
1
2
3
4
2000 3000
4000
5
6
ABCD
M (Nm)
5
4
1
2
3
VOLTAGE LIMITS CHARACTERISTICS
MAINS VOLTAGE: 400 Vrms;
MOTOR VOLTAGE: 400-4.5%: 382 Vrms
MAINS VOLTAGE: 220 Vrms;
MOTOR VOLTAGE: 220-4.5%: 210 Vrms
MAINS VOLTAGE: 400-15%: 340 Vrms;
MOTOR VOLTAGE: 400-15%-4.5%: 325 Vrms
MAINS VOLTAGE: 220-15%: 187 Vrms;
MOTOR VOLTAGE: 220-15%-4.5%:179 Vrms
MAINS VOLTAGE: 400-10%: 360 Vrms;
MOTOR VOLTAGE: 400-10%-4.5%: 344 Vrms
V o l t a g e l i m i t
1
2
L i m i t T o r q u e
L i m i t a t i o n d u e t o m a x i m u m
t h r o u g h t h e d r i v e
M l i m
R a t e d T o r q u e
M n
( 1 0 0 K )
R a t e d S p e e d
n N
M o t o r P e a k T o r q u e
M p
S t a l l T o r q u e
M o
( 1 0 0 K )
P e a k T o r q u e
l i m i t e d b y t h e d r i v e
T O R Q U E ( N · m )
S P E E D ( 1 / m i n )
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