242 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS23x, 34x, 43x
10.5 Objects used in the DSP-402 standard
10.5.2 Factors
Position factor
The position factor is the relation between the user unit and the internal position unit
(steps).
The position factor is automatically calculated when the feed constant (Object 6092h)
and gear ratio (Object 6091h) are set.
Example:
A MIS232 Motor with a 3.5:1 gear box is connected to a belt drive. The diameter of the
drive wheel is 12.4 cm.
The unit of position is required to be in millimetres.
The perimeter of the drive wheel is 389.56mm (124mm*pi)
The parameters should be set as follows:
Name Index
(hex)
Sub
Index
Type Read
only
Default
Feed_constant_Feed 6092 1 UNSIGNED32
Feed_constant_Shaft_revolutions 6092 2 UNSIGNED32
Position_factor 6093 0 UNSIGNED8 X 2
Position_factor_Numerator 6093 1 UNSIGNED32
Position_factor_Feed_constant 6093 2 UNSIGNED32
Velocity_encoder_factor 6094 0 UNSIGNED8 X 2
Velocity_encoder_factor_Numerator 6094 1 UNSIGNED32
Velocity_encoder_factor_Divisor 6094 2 UNSIGNED32
Acceleration_factor 6097 0 UNSIGNED8 X 2
Acceleration_factor_Numerator 6097 1 UNSIGNED32
Acceleration_factor_Divisor 6097 2 UNSIGNED32
Polarity 607E 0 UNSIGNED8
Object Name Value
6091
h
subindex 1
Gear ratio - Motor revolutions 35
6091
h
subindex 2
Gear ratio - Shaft revolutions 10
6092
h
subindex 1
Feed constant - Feed 38956
6092
h
subindex 2
Feed constant - Shaft revolutions 100