September 1, 2014
New RX111 Inverter Solution Kits for Motor Control

Dusseldorf, September 1, 2014 — Renesas Electronics Europe, a premier provider of advanced semiconductor solutions, today announced its new RX111 motor control kits. These inverter reference solution kits are designed to drive any 3-phase permanent magnet synchronous motors (PMSM), also called brushless AC motors. The RX111 inverter kits enable engineers to save time by eliminating the need to tune their motor parameters and evaluate the best tuning algorithm coefficients. As a result, they can rotate a permanent magnet AC motor in less than one minute and accelerate their time to market.

The new RX111 inverter kits revolutionise the integration of 3-phase motors in equipment. Based on Renesas’ 32-bit RX family of MCUs running at 3V, they deliver 50DMIPS at 32MHz. The RX111 reference kits are designed for equipment requiring medium and high dynamics and a low-cost bill of materials. The kits provide up to 7Amax at 24VDC and have been tested with more than 30 different motors. Additionally, an external power stage is available on demand that is fully-compatible with the existing RX220 and RX62T inverter kits. The new RX111 solution kits provide the dynamics required to drive motors with a high level of accuracy.


The availability of the new RX111 kits completes the latest step in Renesas Electronics’ business strategy of providing a wide range of innovative solutions comprising both hardware and software. The company’s existing kits have seen considerable success and broad adoption by designers and engineers, for whom they provide cost savings and faster time to market. Renesas will be launching additional kits over the coming months to continue the implementation of this strategy. Many of the kits will be showcased on Renesas’ stand at electronica in November (Hall A6, Stand 243). With the Renesas trade fair theme ‘Connect with Tomorrow’, the kit solutions will be a central focus at this year’s electronica in Munich.


Renesas has developed the two design tools based on RX111 MCUs to respond to a challenge encountered by engineers: tuning the embedded software to the application requirements, especially for sensorless field oriented control algorithms. The inverter kits provide:

  • Auto-tuning of the current proportional-integral (PI) coefficients: Kp, Ki
  • Identification of intrinsic motor parameters: Rs, Ls, Λm
  • Real-time visualisation of the motor phase, current and step response
  • Dynamic modification of the PWM frequency and control loop


The kits include an intuitive PC graphical user interface (GUI), providing engineers with a ready to use inverter reference prototype that enables them to drive their own motors in a few clicks. The solution kits also feature a sensorless vector control algorithm, which is used to accurately control the speed and the torque. This algorithm uses flux weakening to achieve rotation speeds higher than the nominal speed of the motor. Finally, two flux estimator blocks are implemented to ensure high flexibility in terms of motor types and application requirements.


Each kit contains the YROTATE-IT inverter board, a 24VDC permanent magnet AC motor, a CD-ROM including the embedded software source code, the PC GUI, the board schematics, the bill of materials, Gerber files, user manual, quick start guide and the power stage schematics/Gerber files.


A video demonstration of the kits is available at



The kits are available now from customers’ local Renesas representatives. The part name is YROTATE-IT-RX111. Additional technical details are available at www.renesas/motor.

Refer to the separate sheet for the main specifications of the YROTATE-IT-RX111.


About Renesas Electronics Europe

Renesas delivers trusted embedded design innovation with complete semiconductor solutions that enable billions of connected, intelligent devices to enhance the way people work and live – securely and safely. As the number one global supplier of microcontrollers, and a leader in A&P and SoC products, Renesas provides the expertise, quality, and comprehensive solutions for a broad range of Automotive, Industrial, Home Electronics (HE), Office Automation (OA) and Information Communication Technology (ICT) applications to help shape a limitless future.

Renesas Electronics Corporation was established in 2010 and is headquartered in Japan.With over 800 hardware and software alliance partners worldwide, it has the industry’s largest local support network. Renesas Electronics’ European structure is comprised of three business units – the Automotive, the Broad-based and the Industrial Solution Business Unit.

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The content in the press release, including, but not limited to, product prices and specifications, is based on the information as of the date indicated on the document, but may be subject to change without prior notice.