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Hybrid stepping motors are available with step angles varying from 0.45° to 15°
with 1.8° being the most commonly used. Torque capacity in hybrid steppers
range from 5 - 8000 ounce-inches. Because of their smaller step angles, hybrid
motors have a higher degree of suitability in applications where precise load
positioning and smooth motion is required.
S i z i n g a M o t o r f o r Y o u r S y s t e m
The IB462H is a Bipolar driver which works equally well with both Bipolar and
Unipolar motors (i.e. 8 and 4 lead motors, and 6 lead center tapped motors).
To maintain a given set motor current the IB462H chops the voltage using a
constant 20kHz chopping frequency and a varying duty cycle. Duty cycles that
exceed 50% can cause unstable chopping. This characteristic is directly
related to the motor’s winding inductance. In order to avoid this situation, it is
necessary to choose a motor with a low winding inductance. The lower the
winding inductance, the higher the step rate possible.
W i n d i n g I n d u c t a n c e
Since the IB462H is a constant current source, it is not necessary to use a
motor that is rated at the same voltage as the supply voltage. What is impor-
tant is that the IB462H is set to the motor’s rated current. See
Section 1.7:
Interfacing to the IB462H
for more details.
Figure 1.6.1 A & B: Per Phase Winding Inductance
PHASE A
PHASE A
PHASE B
PHASE B
8 Lead Stepping Motor
Series Configuration
8 Lead Stepping Motor
Parallel Configuration
PHASE A
PHASE A
PHASE B
PHASE B
(Note: This example also
applies to the 6 lead motor
full copper configuration and
to 4 lead stepping motors)
(Note: This example also
applies to the 6 lead motor
half copper configuration)
Specified Per Phase
Inductance
Specified Per Phase
Inductance
Actual Inductance
Seen By the Driver
Actual Inductance
Seen By the Driver
A
B