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