Parker PVD 3405D Betriebsanleitung Seite 14

RS
2.8 Specifications of the R Servomotors
Continuous
torque on slow
rotation
Nominal speed
Nominal power
Nominal voltage
Continuous slow
rotation current
Maximum slow
rotation current
EMF
-1
per 1000 min
Torque per
ampere
Mechanical time
constant
Thermal time
constant
Permissible
loads
This is the torque measured at the drive shaft in continuous service (S1, VDE
0530) at a slow operating speed and at an ambient temperature of 40°C, without
the bearings heating above the tolerable temperature. This torque is instrumental
in determining an operating or a machining cycle.
This is the operating speed of the servomotor, limited by definition to 3 000 min
Thermally, this speed could be higher but there are few applications. It is
advisable not to exceed the nominal speed continuously as this could reduce the
service life of the servomotor.
The power is not important in automatic control. However, this value may be
used for comparison of servomotors.
The nominal voltage is the continuous voltage which must be applied to the
motor terminals to give the nominal torque (read on the curve) at the nominal
speed. It is advisable not to exceed these voltages at continuous speeds.
This is the current required to give the continuous torque.
It is defined for a low ripple continuous current (form factor < 1.02). If rippling is
higher than this, the continuous torque should be reduced according to the ratio :
= =
ff form factor
average
For example :
If ft=1.1, the torque M will be equal to :
If the ripple rate is too high, a smoothing self-induction coil should be used in
series with the motor.
This is the current required to give the torque in pulse operating mode.
Exceeding this value could cause abnormal wear of the commutator and/or
partial demagnetization of the motor
The constant of electromotive force KE indicates the voltage measured at the
commutator for a no-load speed of 1000 min
voltage, the motor speed will be :
U - (RI)
= ×
M
1000
Ke
The torque constant KT indicates the torque in function of the induced current.
M = Kt.I
This is the time (ms) taken to reach 63 % of the nominal stabilized speed when
the motor is started from a standstill position. This theoretical value can be used
to determine the motor dynamics.
This is the time taken to yield 63 % of the nominal heating between the motor
and the ambient air.
These are the axial and radial values at 3000 min
withstand without influencing its service life.
PVD 3405 - 01/2023
effective current
=
current
M
I
R
U
Ke = EMF constant, Volts per 1000 min
M
I
Kt
14
RMS
arithmetic mean value
Mo
= =
0,90089Mo
ff
-1
at 25°C. Under load, for a given
= current at terminals, A
= resistance of the commutator, Ohm
= Voltage at terminals, V
= torque, Nm
= current, A
= torque constant, Nm/A
-1
which the drive shaft can
-1
.
-1.