National Instruments NI MID-760X - Manual
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Stepper and Servo Motor Drives
Motion
Overview and Applications
The National Instruments MID-760x integrated stepper motor
power drives and MID-765x integrated DC-brush servo motor
power drives offer reliable, easy-to-connect drive solutions for
National Instruments motion controllers. The NI MID-760x
provides stepper motor control from the NI 7330, 7340, and 7350
controllers. The MID-7650 provides DC-brush servo motor control
from NI 7340 and 7350 controllers. Because the MID-760x and the
MID 7650 have all the required motion drive and motion I/O signals,
they offer all the features of a universal motion interface wiring
module with the enhancements of a powered motor drive in a single
product. The NI MID power drives connect to motion controller
boards through a single-shielded cable that transfers all motor
commands, as well as motion I/O control and feedback signals.
The MID-7604 and MID-7602 are 4-axis and 2-axis stepper motor
drive units, respectively. The MID-7654 and MID-7652 are 4-axis
and 2-axis DC-brush servo motor drive units, respectively.
These compact, well integrated drives incorporate per-axis
amplifiers, motor-power DC bus supplies, low-voltage motion I/O
supplies, and pluggable screw terminal connectivity in a single
rugged metal enclosure. This optimized system wiring design
simplifies motion component selection.
High-Efficiency Architecture
The MID-760x power drives incorporate an efficient bipolar chopper
architecture that converts step and direction control signals into
winding currents for 2-phase stepper motors. The MID-765x power
drives incorporate an efficient servo amplifier architecture that
converts analog control signals into winding currents for DC-brush
motors. The pulse width modulation driver technology in the
MID-765x accurately controls motor winding current, while
reducing motor heating, lowering ripple current, and improving
overall motor performance. Active fan cooling provides optimal
motion power drive operation.
• High-efficiency, bipolar chopper
stepper drives
• User-selectable microstepping
and peak current
• Integrated power supply
• CE approved and UL recognized
NI MID-7654, NI MID-7652
• High-efficiency servo amplifiers
• User-selectable peak current
and continuous current
• Integrated power supply
• CE approved and UL recognized
NI MID-7604, NI MID-7602
Stepper and Servo Motor Drives
Compact
Front Panel
Front Panel
NI 7350
Motor Drive
Current/Axis
Enclosure and
Selectable
Selectable
Model
Stepper
Servo
NI 7330
NI 7340
(V)
(A)
Diagnostic LEDs
Microstepping
Peak Current
Axes
MID-7604
✓
–
✓
✓
24
0.2 to 1.4
✓
✓
✓
4
MID-7602
✓
–
✓
✓
24
0.2 to 1.4
✓
✓
✓
2
MID-7654
–
✓
–
✓
48
0.8 to 5 continous
✓
–
✓
4
10 peak
MID-7652
–
✓
–
✓
48
0.8 to 5 continous
✓
–
✓
2
10 peak
Figure 1. Stepper and Servo Motor Drive Features
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