Motor Control: AC Induction

Block Diagram (SBD) for AC Induction Motor (ACIM) System featuring microcontrollers, gate drivers, isolation, industrial interface and power management.

Block Diagram

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Design Considerations

AC Induction Motor Overview

The AC induction motor (ACIM) is the most popular motor used in consumer and industrial applications. The motor is highly reliable, as its simple design has no brushes that could wear out, and it can be manufactured at a very low cost. Another key feature is that the rotor does not have any moving contacts, which eliminates sparking. The ACIM is less efficient than other motor types, however.

ACIM speed depends on the frequency of the AC input voltage and the number of poles in the stator windings. AC induction motors are available in single-phase and three-phase versions; three phase is an ideal choice for variable-speed applications.

Microcontrollers

TI's Stellaris™ C2000™ and Hercules™ microcontroller (MCU) families are ideal for controlling an AC induction motor. All of these MCU families can be used for implementing scalar or vector-control techniques.

C2000 MCUs are ideally designed for real-time operation and have high-resolution pulse-width modulators (PWMs) for precise control of gate drivers. The dual sample-and-hold, 12-bit, high-speed analog-to-digital converters (ADCs) can sample any sensor inputs with high precision.

The combination of high-performance PWMs and ADCs guarantees a low torque ripple and highly efficient motor control. The powerful C2000 MCU core architecture enables fast execution of mathematical algorithms for controlling the motors with vector control.

Stellaris MCUs are based on the widely used ARM Cortex M3 core and have all motor-control-related peripherals integrated on board. Stellaris MCUs have a 10-bit ADC and motor-control-specific PWM to provide efficient control of the motor. On-board communication peripherals such as USB and Ethernet enable the MCU to act as a networked controller that can perform motor control as well.

The RM4 and TMS570 Hercules Safety MCUs are based on the widely used ARM Cortex R4F core and are built to ease the development and certification of safety critical systems. The RM4 and TMS570 Hercules Safety MCUs have a up to 2x 12-bit ADC. The flexible HET Co-Processor delivers motor-control-specific PWM to provide efficient control of the motor. On-board communication peripherals such as USB, Ethernet and CAN enable the MCU to act as a networked controller that can perform safe motor control as well.

Isolation

TI digital isolators have logic input and output buffers separated by TI's silicon dioxide (SiO2) isolation barrier, providing 4 kV of isolation. Used in conjunction with isolated power supplies, these devices block high voltages, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

Interface/Connectivity

Traditional analog RS-232/RS-485 interfaces remain popular choices for motor control applications. Looking forward, designers are integrating mainstream interfaces such as Ethernet, USB and CAN into their products. TI is committed to providing solutions for both traditional and emerging industrial interfaces. For example, TI recently introduced the ISO1050, the world's first isolated CAN transceiver.

Power Management

Texas Instruments offers power management IC solutions ranging from standard ICs to high-performance, plug-in, power-brick, digital-power MOSFETs and integrated power modules.

From AC/DC and DC/DC power supplies, linear regulators and non-isolated switching DC/DC regulators to PMICs and power and display solutions, Texas Instruments power management IC solutions can help you complete your project.

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Application Notes (5)

Title Abstract Type Size (KB) Date Views
HTM 9 KB 01 Jul 2013 2061
HTM 8 KB 01 Jul 2013 1425
HTM 8 KB 06 Sep 2011 814
HTM 8 KB 06 Sep 2011 637
HTM 8 KB 06 Sep 2011 777
    

Reference Designs

Description Part Number Company Tool Type
Stellaris® AC Induction Motor Reference Design Kit RDK-ACIM Texas Instruments Reference Designs

Selection and Solution Guides

Selection Guides (5)

Title Abstract Type Size (KB) Date Views
PDF 2.8 MB 25 Jun 2014 66530
PDF 4.63 MB 22 May 2014 3906
PDF 9.51 MB 01 May 2014 58115
PDF 6.82 MB 25 Mar 2014 12636
PDF 16.33 MB 17 Nov 2011 999

Solution Guides (5)

Title Abstract Type Size (KB) Date Views
PDF 4.07 MB 12 Nov 2013 4589
PDF 1.08 MB 31 Oct 2013 6090
PDF 599 KB 30 Oct 2013 3748
PDF 2.13 MB 30 Oct 2013 3240
PDF 5.83 MB 26 Oct 2012 13221

Tools and Software

Name Part # Company Software/Tool Type
AMC1210 Mother Board AMC1210MB-EVM Texas Instruments Evaluation Modules & Boards
C2000 Resolver to Digital Conversion Kit TMDSRSLVR Texas Instruments Evaluation Modules & Boards
Code Composer Studio (CCS) Integrated Development Environment (IDE) CCSTUDIO Texas Instruments SW Development Tools, IDEs, Compilers
High Voltage Motor Control and PFC Developer's Kit TMDSHVMTRPFCKIT Texas Instruments Evaluation Modules & Boards

Product Bulletin & White Papers

Product Bulletin (2)

Title Abstract Type Size (MB) Date Views
PDF 311 KB 20 Nov 2013 1764
PDF 216 KB 17 Oct 2012 2571

White Papers (3)

Title Abstract Type Size (MB) Date Views
PDF 1.17 MB 04 Oct 2012 2014
PDF 179 KB 20 Apr 2012 3075
PDF 1.64 MB 02 Sep 2011 2034

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Training & events

Name Type Available During
Motion in Minutes: Single and multi-axis speed and position control
Get exposed to the latest in high performance control technology for elevators, CNC, robotics and servo drive applications.
On-Line Training   On Demand  
Getting Started - InstaSPIN-FOC Enabled C2000 LaunchPad and Motor Boosterpack
Learn how to quickly develop motor control applications.
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Getting Started - MSP430 LaunchPad and NFC BoosterPack
Learn how to quickly develop NFC applications.
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Tiva C Series TM4C129x MCUs
This 6-part series will introduce you to various features on TM4C129x microcontrollers.
On-Line Training   On Demand  
Intro to Motor Drives and the Motor Signal Chain
This session will focus in on the analog drive section of the motor.
On-Line Training   On Demand  

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