Optimize Motor Reference Point And Switching Frequency Of The Motor Current - Parker Compax3 Series Operating Instructions Manual

Parker EME
4.1.4. Optimize motor reference point and switching frequency of the
motor current
Optimization of the
motor reference
point
Optimization of the
switching frequency
Please note the following equivalence that applies regarding terms to linear
Rotary motors / linear motors
Rotations ≡ Pitch
rotational speed ≡ speed
torque ≡ force
moment of inertia ≡ load
Notes on direct drives (see page 346) (Linear and Torque – Motors)
The motor reference point is defined by the reference current and the reference
(rotational) speed.
Standard settings are:
Reference current = nominal current
Reference (rotational) speed = nominal (rotational) speed
These settings are suitable for most cases.
The motors can, however, be operated with different reference points for special
applications.
By reducing the reference (rotational) speed, the reference current can be increa-
sed. This results in more torque with a reduced speed.
For applications where the reference current is only required cyclically with long
enough breaks in between,you may use a reference current higher than I
limit value is however reference current = max. 1.33*I
speed must also be reduced.
The possible settings or limits result from the respective motor characteristics.
Caution!
Wrong reference values (too high) can cause the motor to switch off
during operation (because of too high temperature) or even cause da-
mage to the motor.
The switching frequency of the power output stage is preset to optimize the opera-
tion of most motors.
It may, however, be useful to increase the switching frequency especially with di-
rect drives in order to reduce the noise of the motors. Please note that the power
output stage must be operated with reduced nominal currents in the case of in-
creased switching frequencies.
The switching frequency may only be increased.
Caution!
By increasing the motor current switching frequency, the nominal cur-
rent and the peak current are reduced.
This must already be observed in the planning stage of the plant!
The preset motor current switching frequency depends on the performance variant
of the Compax3 device.
The respective Compax3 devices can be set as follows:
192-120114 N5 C3I22T11 June 2008
motors:
. The reference (rotational)
0
Setting up Compax3
. The
0
103