User`s manual

5-47
5
Functions
5. Functions
The distance the motor or slider moves during magnetic pole position estimation can be
derived by the following formula.
Movement distance [mm] = Fb-40 ×(Fb-41 + Fb-43) / 1000
Example: Distance moved with Fb-40=80, Fb-41=10, and Fb-43=10
Movement distance [mm] = 80 ×(10 + 10) / 1000 = 1.6 [mm]
[Mover mass and speed control cut-off frequency for magnetic pole position estimation]
Use Fd-46 (Mover mass for pole position estimation) to set the mover mass for
magnetic pole position estimation. Likewise, use Fd-47 (Speed control cut-off
frequency for pole position estimation) to set the speed control cut-off frequency.
Also use Fd-48 (Gain change time constant after pole position estimation) to set the
time constant of the first-order lag filter for gain switching when shifting to normal
control after estimating the magnetic pole position.
SRD
SON
Mover mass
Speed control
cut-off frequency
Magnetic pole position
estimation operation
Fd-48 × 5
or more
Fd-00
Fd-01 (Fd-34)
Fd-46
Fd-47
Note 1: Fd-46, Fd-47 and Fd-48 cannot be set for RDP that was shipped initially. Use
Fd-00 and Fd-01 to set the mover mass and speed control cut-off frequency for
magnetic pole position estimation and normal control operation.
Note 2: These parameters can be set with the dedicated software TOP (Ver. 6.5.1 or
later). If using an earlier version of TOP, set them from the front panel.
<To shorten the distance moved during magnetic pole position estimation>
Setting the parameters as shown below in (1) through (3) shortens the distance moved
during magnetic pole position estimation.
(1) Set Fb-42 (Pole position estimation wait time) to approximately 300 [ms].
(2) Set as follows to reduce the movement distance.
• Fb-41 (Pole position estimation ACC/DEC time) = 10 [ms]
• Fb-43 (Pole position estimation constant-speed time) = 0 [ms]
(3) To decrease the movement distance, adjust Fb-40 (Pole position estimation speed)
to a small value.