National Instruments NI MID-760X User Manual

Stepper and servo motor drives, Overview and applications, High-efficiency architecture

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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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