Figure 6.1 A & B: Per Phase Winding Inductance - Intelligent Motion Systems Excellence in Motion IM805H Operating Instructions Manual

Actual Inductance
Seen By the Driver
Specified Per Phase
Inductance
PHASE A
PHASE A
PHASE B
PHASE B
8 Lead Stepping Motor
Series Configuration
(Note: This example also
applies to the 6 lead motor
full copper configuration and
to 4 lead stepping motors)
A
Figure 6.1 A & B: Per Phase Winding Inductance
The per phase winding inductance specified may be different than the per phase
inductance seen by your IM483H/IM805H driver depending on the wiring con-
figuration used. Your calculations must allow for the actual inductance that the
driver will see based upon the motor's wiring configuration used.
Figure 6.1A shows a stepper motor in a series configuration. In this configu-
ration, the per phase inductance will be 4 times that specified. For example:
a stepping motor has a specified per phase inductance of 1.47mH. In this
configuration the driver will see 5.88 mH per phase.
Figure 6.1B shows an 8 lead motor wired in parallel. Using this configuration
the per phase inductance seen by the driver will be as specified.
Maximum Motor Inductance (mH per Phase) =
NOTE: In calculating the maximum phase inductance, the
minimum supply output voltage should be used when using an
unregulated supply.
Using the following equation we will show an example of sizing a motor for
a IM483H/IM805H used with an unregulated power supply with a minimum
voltage (+V) of 18 VDC:
.2 X 18 = 3.6 mH
The maximum per phase winding inductance we can use is 3.6 mH.
.2 X Minimum Supply Voltage
Actual Inductance
Seen By the Driver
Specified Per Phase
Inductance
PHASE A
PHASE A
PHASE B
PHASE B
8 Lead Stepping Motor
Parallel Configuration
(Note: This example also
applies to the 6 lead motor
half copper configuration)
B
IM483H/IM805H Rev. R032206
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