Power Brick Controller User Manual
Manual Motor Setup
133
Current Loop tuning
Current loop tuning of brushless motors is carried out similarly to any Power PMAC digital current loop
configuration. Current loop tuning is typically performed using the tuning tool in the IDE software.
Note
With some basic knowledge of motor and amplifier parameters, it is
possible to calculate the current-loop gains empirically. This is
described in the Power PMAC User manual.
The "Simple Auto-tune" and "Auto-tune" tools are straight forward tools which may be used effectively.
Following, is a practical description of the "Interactive tune" utility.
The current loop step test magnitude and rough phasing are typically in the range of:
Motor[
x
].I2TSet / 2
< Magnitude <
Motor[
x
].I2TSet
This allows enough current to overcome static non-linear components for a good response without the risk
of overheating the motor or triggering an over-current fault.
The "Dwell Time" is typically in the 50 – 100 msec range. This may be extended for slower response motors
(high inductance).
Conservative start < 0.15
Conservative Start: IiGain * 10
[I2TSet/2 – I2TSet]
[I2TSet/2 – I2TSet]
[50 – 100]
Brushless motors’ current loop can usually be tuned using exclusively
Motor[
x
].IiGain
and
Motor[
x
].IpfGain
. In the Power PMAC digital current loop algorithm these gains – for practical usage in
a time domain plot – can be thought of as:
Motor[
x
].IiGain
: The transient effort (in reality integral gain as in a position loop).
Motor[
x
].IpfGain:
The damping gain (in reality proportional gain as in a position loop).
Содержание PBC Series
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