Parker NX Series, Technical Manual, Page: 17 / 116

17 - PVD 3663_GB_NX_March 2017.Docx
Example n°1 :
The application needs:
- a rms torque of 7 Nm at the rms speed of 2000 rpm,
- an acceleration torque of 12 Nm,
- a maximal speed of 2800 rpm.
Selection of the motor:
The selected motor is the type NX620EAR.
The nominal speed is equals to 3900 rpm.
The maximal speed is equals to 3900 rpm.
The torque sensitivity is equals to 1.47 Nm/Arms.
The permanent current I
0
of the motor is 5.31 Arms for M
0
=8 Nm at low speed.
The nominal current I
n
of the motor is 4.25 Arms for M
n
=6.17 Nm at the nominal speed.
Selection of the drive:
The drive has to provide at least a permanent current equals to I
0
(5.31 Arms).
In order to obtain an acceleration torque of 12 Nm , the current will be about 8 Arms
(the motor data sheet shows 17 Nm with 11.3 Arms). This means that the drive has to provide
at least 8 Arms as transient current.

Therefore, we can select the drive AC890SD-53 2100 B which delivers under 400 VAC:
6 Arms as permanent current and
6* 200% =12 Arms as maximal transient current during 4 s.
The drive is set with “Servo Mode” .

We also can select the drive DIGIVEX 8/16 Â which delivers under 400 VAC:
5.6 Arms as permanent current and
5.6* 200% =11.3 Arms as maximal transient current during 2 s.
BRUSHLESS MOTORS BÜRSTENLOSE SERVOMOTOREN
NX620EAR NX620EAR
ELECTRONIC DRIVE (1) STEUERELEKTRONIK (1)
DIGIVEX 7.5/15 et DIGIVEX 8/16 DIGIVEX 7.5/15 et DIGIVEX 8/16
(230V) (400V) (480V)
Torque at low speed
M
o
Nm 8
Permanent current at low speed
I
o
A
rms
5.31
Peak torque
M
p
Nm 26.7 --
Current for the peak torque
I
p
A
rms
21.2 --
Back emf constant at 1000 rpm (25°C)* Ke
V
rms
95.7
Torque sensitivity Kt
Nm/A
rms
1.51
Winding resistance (25°C)* Rb

2.24
Winding inductance* L mH 19.2
Rotor inertia J kgm²x10
-5
98
Thermal time constant Tth min 27
Motor mass M kg 7
Voltage of the mains
UR1 UR2 UR3
V
rms
230 400 480
Rated speed
Nn1 Nn2 Nn3
rpm 2200 3900 4500
Rated torque
Mn1 Mn2 Mn3
Nm 7.42 6.17 5.57
Rated current
In1 In2 In3
A
rms
4.99 4.25 3.89
Rated power
Pn1 Pn2 Pn3
W 1710 2520 2620
All data are given in typical values under standard conditions
* Phase to phase (1) Please check the availability of this drive with 480 V
Voltages and currents are given in rms values
Characteristics are given for an optimal drive of the motor
FICHE-009
Création: 04 avr 2000 Edition: 31/mars/2011 NX620EAR .a
0
2
4
6
8
10
12
14
16
18
0 1000 2000 3000 4000 5000
T
o
rq
u
e
i
n
N
.m
Speed in rpm
BRUSHLESS MOTORS BÜRSTENLOSE SERVOMOTOREN
NX620EAR NX620EAR
ELECTRONIC DRIVE (1) STEUERELEKTRONIK (1)
DIGIVEX 7.5/15 et DIGIVEX 8/16 DIGIVEX 7.5/15 et DIGIVEX 8/16
(230V) (400V) (480V)
Torque at low speed
M
o
Nm 8
Permanent current at low speed
I
o
A
rms
5.31
Peak torque
M
p
Nm 26.7 --
Current for the peak torque
I
p
A
rms
21.2 --
Back emf constant at 1000 rpm (25°C)* Ke
V
rms
95.7
Torque sensitivity Kt
Nm/A
rms
1.51
Winding resistance (25°C)* Rb

2.24
Winding inductance* L mH 19.2
Rotor inertia J kgm²x10
-5
98
Thermal time constant Tth min 27
Motor mass M kg 7
Voltage of the mains
UR1 UR2 UR3
V
rms
230 400 480
Rated speed
Nn1 Nn2 Nn3
rpm 2200 3900 4500
Rated torque
Mn1 Mn2 Mn3
Nm 7.42 6.17 5.57
Rated current
In1 In2 In3
A
rms
4.99 4.25 3.89
Rated power
Pn1 Pn2 Pn3
W 1710 2520 2620
All data are given in typical values under standard conditions
* Phase to phase (1) Please check the availability of this drive with 480 V
Voltages and currents are given in rms values
Characteristics are given for an optimal drive of the motor
FICHE-009
Création: 04 avr 2000 Edition: 31/mars/2011
NX620EAR .a
0
2
4
6
8
10
12
14
16
18
0 1000 2000 3000 4000 5000
T
o
rq
u
e
i
n
N
.m
Speed in rpm