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9.6.3
Stepper Motor Without Encoder
Overview
The FM 453 also operates with stepper motors without encoders.
The position resolution of the axis is determined by the traversing distance of
one motor increment.
The control frequency pulses emitted by the FM 453 are added internally to
form a position value.
Function
The following table shows you how to adapt a stepper motor to the FM 453.
Parameters
11
12
52
MSR stands for measurement system raster (see Section 5.3.1)
Example for
Stepper motor: Number of increments per revolution (MD52) = 10,000
Stepper Motor
Machine design:
Adjustment
Motor with 50:30 gear ratio on spindle with 10 mm pitch = 10,000 MSR
From this one can calculate the following traversing distance per motor revo-
lution:
Gear ratio: i =
Travel per motor revolution =
The following values are entered:
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
MD
Designation
Travel per motor revolution
(division period)
Residual distance per motor
revolution (division period)
Increments per motor revo-
lution (division period))
MD
11
32
12
0.666... 2
13
Description of Functions
Value/Meaning
1...1,000,000,000
(MSR)
see Section 5.3.1,
(integer portion)
Dependencies
32
0...2
–1
(2
see Section 5.3.1,
(fractional portion)
Dependencies
4...10 000
Entry per stepper mo-
tor data plate
50 spindle revolutions
30 motor revolutions
i 10,000 MSR = 16,666.666... MSR
Value
16 666
= 2,863,311,530
(2
2 500
Comments/Unit
–32
MSR)
= 1.666666...
Unit
–3
(10
mm)
–32
–3
10
mm)
(pulse/rev)
9-67
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