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National Instruments • Tel: (800) 433-3488 • Fax: (512) 683-9300 • info@ni.com • ni.com
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