Technosoft 2018
78
iPOS4808 VX Technical Reference
For linear motors:
Pole_Pitch
Motor_Speed[SI] =
×Motor_Speed[IU]
resolution× T
where:
resolution – is the motor position resolution
T – is the slow loop sampling period expressed in [s]. You can read this value in the “Advanced”
dialogue, which can be opened from the “Drive Setup”
Pole_Pitch – is the magnetic pole pitch NN (distance expressed in [m])
DC brushed motor with quadrature encoder on load and tacho on motor
The internal motor speed units are A/D converter bits. The correspondence with the motor
speed
in SI units
]
IU
[
Speed
_
Motor
gain
_
Tacho
Range
_
Input
_
ue
log
Ana
]
SI
[
Speed
_
Motor
×
×
=
4096
where:
Analogue_Input_Range – is the range of the drive analogue input for feedback, expressed in [V].
You can read this value in the “Drive Info” dialogue, which can be opened from the “Drive Setup”
Tacho_gain – is the tachometer gain expressed in [V/rad/s]
DC brushed motor with tacho on motor
The internal motor speed units are A/D converter bits. The correspondence with the motor speed
in SI units is:
]
IU
[
Speed
_
Motor
gain
_
Tacho
Range
_
Input
_
ue
log
Ana
]
SI
[
Speed
_
Motor
×
×
=
4096
where:
Analogue_Input_Range – is the range of the drive analogue input for feedback, expressed in [V].
You can read this value in the “Drive Info” dialogue, which can be opened from the “Drive Setup”
Tacho_gain – is the tachometer gain expressed in [V/rad/s]
Step motor open-loop control. No feedback device or incremental encoder
on load
The internal motor speed units are motor µsteps / (slow loop sampling period). The correspondence
with the motor
speed in SI units
is:
1
SI units for motor speed are [rad/s] for a rotary motor, [m/s] for a linear motor