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.


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.


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.


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 2925
HTM 8 KB 01 Jul 2013 4229
HTM 8 KB 06 Sep 2011 1031
HTM 8 KB 06 Sep 2011 962
HTM 8 KB 06 Sep 2011 1003

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 2.83 MB 02 Apr 2014 44165
PDF 6.82 MB 25 Mar 2014 45215
PDF 647 KB 16 Jan 2014 4787
PDF 8.94 MB 11 Mar 2013 28717
PDF 16.33 MB 17 Nov 2011 4565

Solution Guides (5)

Title Abstract Type Size (KB) Date Views
PDF 4.07 MB 12 Nov 2013 4956
PDF 1.08 MB 31 Oct 2013 7566
PDF 599 KB 30 Oct 2013 3686
PDF 2.13 MB 30 Oct 2013 3355
PDF 5.83 MB 26 Oct 2012 26057

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 (CCStudio) Integrated Development Environment (IDE) v5 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 2262
PDF 216 KB 17 Oct 2012 3143

White Papers (3)

Title Abstract Type Size (MB) Date Views
PDF 1.17 MB 04 Oct 2012 2687
PDF 179 KB 20 Apr 2012 3539
PDF 1.64 MB 02 Sep 2011 2584

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Training & Events

Name Type Available During
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  
Field Oriented Control of Permanent Magnet Motors
In this session, we investigate the Field Oriented Control process in an easy to understand way using animations and simulations.
On-Line Training   On Demand  
Introduction to Motors & Motor Control
This session will talk about the different types of motors used in the industry.
On-Line Training   On Demand  
Make the Most out of Motor Control
Learn how to simplify and speed up motor control development in this session covering new, easy to use InstaSPIN-MOTION.
On-Line Training   On Demand  
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  

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