What Is NI Motion Control?

NI motion control is for National Instruments test, measurement, and control platforms. NI offers PCI and PXI plug-in motion controllers, as well as NI C Series drive and drive interface modules for NI CompactRIO. Engineers are using NI LabVIEW system design software, versatile controllers, and a complete drive and motor portfolio to build advanced motion applications, faster and at a lower cost.

Understanding the NI Motion Control Architecture

Motion systems typically consist of application software, a motion controller, drives, motors, and mechanical components such as gearboxes and stages. Learn more about each of these components in the sections below.

Architectures

The following pieces of the motion control architecture are implemented at different hardware component levels depending on the application: Application Programming, Supervisory Control, Trajectory Generation, Trajectory Interpolation, and Control Loops (Position, Velocity, Torque). They are traditionally split between a development machine, a real-time motion controller, and drive firmware. Components below the application programming level are typically executed deterministically to meet the control and I/O requirements of the motion system. NI has two separate architectures for deterministic execution of these components: (1) plug-in motion controllers and (2) LabVIEW real-time targets as motion controllers through the NI LabVIEW NI SoftMotion Module.

NI SoftMotion Architecture

The NI SoftMotion architecture blurs the lines of these traditional components, giving you the flexibility to design a custom motion system.

Plug-In Motion Controller Architecture

The NI plug-in motion controller architecture follows a traditional well-defined model for the placement of the components.

Software

The two different motion architectures offered by NI (see Architectures tab) are programmed with different software. Applications using NI plug-in motion controllers are programmed with the NI-Motion driver and the NI Motion Assistant, whereas applications using NI real-time controllers and NI NI field-programmable gate array (FPGA) targets are programmed with the LabVIEW NI SoftMotion Module.

LabVIEW NI SoftMotion Module

You can use LabVIEW NI SoftMotion to program motion applications on NI real-time processors and NI FPGA targets. The module is called LabVIEW NI SoftMotion because it is an implementation of software-defined motion control, where the various motion control components, such as supervisory control, trajectory generation, and the control loops, are modularized. Each component is then targeted to the most appropriate part of the motion system (development machine, real-time processor, or FPGA) as suits a particular application. The power of the platform is that you can use LabVIEW NI SoftMotion to solve advanced applications right out of the box, or customize it at the application code, real-time NI SoftMotion Engine, or FPGA IP level as needed. With LabVIEW NI SoftMotion, you can use the LabVIEW project to quickly configure motion axis settings, simulate axes, bind axes to hardware, and test and tune a motion setup before developing an application. Once an application is developed, you can run it on the development machine connected to a real-time controller executing the NI SoftMotion Engine, or deploy it to an NI real-time controller to run stand-alone or through communication to a human machine interface.

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NI-Motion Driver

You can use the NI-Motion driver to program NI PCI and PXI plug-in motion controllers (NI 7330, NI 7340, NI 7350, and NI 7390 series controllers). This driver consists of LabVIEW VIs and examples to help you quickly create motion control applications using the plug-in controllers on either LabVIEW for Windows or LabVIEW Real-Time.

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The NI Motion Assistant

The NI Motion Assistant is a configuration-based interactive development environment for rapidly prototyping and deploying your motion applications using NI PCI and PXI plug-in motion controllers. With the NI Motion Assistant, quickly prototype applications and convert them into ready-to-run LabVIEW VIs or ANSI C code.

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Controllers

The two fundamentally different motion architectures offered by NI (see Architectures tab) use different controller options as well as different software. Applications using NI plug-in motion controllers are programmed with the NI-Motion driver and the NI Motion Assistant, whereas applications using NI real-time controllers and NI FPGA targets are programmed with the LabVIEW NI SoftMotion Module.

LabVIEW Real-Time Targets Using LabVIEW NI SoftMotion

You can use any LabVIEW Real-Time target as a motion controller with LabVIEW NI SoftMotion, including PXI, NI CompactRIO, NI Single-Board RIO, and NI industrial controllers. The LabVIEW project is used to configure motion axis settings, test configuration, and tune motors. LabVIEW NI SoftMotion provides the supervisory control and a powerful trajectory generator, which are automatically deployed to the real-time controller alongside your motion system settings and application code. With a LabVIEW Real-Time target as a motion controller, you can customize motion functionality and deterministically integrate with measurement I/O or vision for force feedback or vision-guided motion applications.

Building an NI motion control system

PCI and PXI Plug-In Motion Controllers

The NI 7330, 7340, 7350, and 7390 series PCI and PXI boards are digital signal processor (DSP)-based motion controllers programmed with LabVIEW using the NI-Motion driver. NI plug-in motion controllers are available in two- to eight-axis variants for both stepper and servo motor control. You can use each of these controllers in a Windows or a LabVIEW Real-Time system and integrate them with NI data acquisition (DAQ) devices for high-performance automated test systems. They are also compatible with the Motion Assistant, a reconfigurable interactive motion prototyping tool.

NI PCI and PXI motion controllers

Drives

National Instruments motor power drives provide reliable, easy-to-connect drive solutions for all NI motion controllers in a variety of power ranges and form factors.

NI C Series Drives (NI 9501, NI 9502, NI 9505)

C Series drive modules integrate drive electronics directly into a CompactRIO chassis for a rugged, embedded motion solution. LabVIEW NI SoftMotion ships with extensive ready-to-run examples for these modules and FPGA IP blocks for drive control components to get you up and running quickly. Drive control is implemented in LabVIEW FPGA allowing low-level customization of algorithms normally implemented in external drive firmware. All three modules are single axis. The NI 9505 is a full H-bridge module for driving brushed DC servo motors, relays, lamps, solenoids, and valves. The NI 9501 is a stepper motor drive, and the NI 9502 is a brushless servo motor (BLDC or BLAC PMSM) drive.

NI 9501 | NI 9502 | NI 9505

C Series Drive Interfaces (NI 9512, NI 9514, NI 9516)

C Series drive interfaces for CompactRIO offer direct connectivity to hundreds of stepper and servo drives. These modules provide servo or stepper drive interface signals for a single axis. In addition, they offer a full set of motion I/O including inputs for a home switch and limit switches, incremental encoder inputs for position feedback, and digital input and digital output lines. The NI 951x drive interfaces include a processor to run the spline interpolation engine and the patented NI step generation algorithm or control loop.

C Series drive interfaces

Brushless servo drives

The AKD brushless servo drives feature cutting-edge technology for a single motion axis. They provide plug-and-play configuration with NI AKM brushless servo motors and connect to motion controllers either through an analog control signal or via deterministic EtherCAT communication. From an NI real-time target with two Ethernet ports, you can implement motion systems that use EtherCAT communication to directly connect to EtherCAT drives. You also can take advantage of NI 9144 EtherCAT expansion chassis and C Series drive interface modules to connect to an AKD through analog control signals or step and direction commands. Because they are based on the same technology, local (analog control) and distributed (EtherCAT) motion axes can be combined within the same controller.

AKD servo drives

Stepper motor drives

NI P7000 stepper motor drives provide reliable, easy-to-connect cabling solutions for all NI motion controllers. NI offers one-axis power drives with high-torque output, microstepping, and anti-resonance control. The P70360 one-axis AC input power drive offers 320 V bus and 3.5 A peak current output, and the P70530 one-axis DC input power drive offers 20 to 75 V bus and 7.1 A peak current output. NI has direct connection solutions for connecting the P7000 drives to both NI PCI and PXI plug-in motion controllers, as well as the NI 9512 C Series Drive Interface Module.

Stepper motor drives

MID Stepper and Servo Drives

MID servo drives are four- and two-axis DC brushed servo motor drive units, that offer 5 A current output per axis. MID stepper drives are also four- or two-axis, and offer 1.4 A current output per axis. Both are designed for direct connectivity to the NI PCI and PXI plug-in servo motor controllers.

MID stepper drives | MID servo drives

Motors

NI brushless servo motors provide superior dynamic performance, offer plug-and-play configuration through smart feedback technology, and are perfectly matched with NI servo drives. NI brushless servo motors incorporate low-inertia rotors and stand out due to their low-cog, low-harmonic distortion magnetic design.

Servo Motors

NI AKM brushless servo motors provide superior dynamic performance, offer plug-and-play configuration through smart feedback technology, and are perfectly matched with AKD servo drives. AKM brushless servo motors incorporate low-inertia rotors and stand out due to their low-cog, low-harmonic distortion magnetic design.

NI Brushless Servo Motors

Stepper Motors

NI stepper motors provide precise, high-torque performance and easy connectivity to NI stepper motor drives. Because of their brushless design, rugged bearings, and innovative cooling technology, these motors offer long-term durability. The two-phase design ensures small and precise movement in 1.8 degree increments (200 steps/revolution) and is simple to control.

NI Stepper Motors

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