Brushless DC motor control in just one day: Page 4 of 5

April 07, 2011 //By Ralf Koedel, Alexander Schmidt
Brushless DC motor control in just one day
Electric motor drives are being used increasingly for water, oil and petrol pumps, fans and air conditioning systems in automotive applications. In conjunction with powerful control algorithms running on optimised microcontrollers, BLDC motors offer very efficient solutions. For brushless motors, various control schemes, including field oriented control (FOC), are available. The article explains how to implement of a complete motor control in just one day.
options with 16 to 64 pins and is designed for an extended temperature range with up to 150°C. As such, it is ideally suited for the harsh environments encountered in automotive applications.  

The XC2236N belongs to the 16-bit microcontrollers of the XC2000 family, whose performance is comparable with that of 32-bit MCUs. The XC2000 family has been specially developed for automotive applications and is based on the proven C166 architecture. With efficient peripheral functions such as two CAPCOM6 modules and up to two high-speed 12-bit AD converters, the 80-MHz microcontroller is ideal for a diverse range of motor controls in the automotive sector. To this end, besides an efficient MAC unit, it offers 32 up 1600 KB flash memory and 136 KB RAM in scalable package options from 38 up to 176 pins.

In addition to the functions mentioned earlier, the TLE7184F bridge driver (Fig. 3b) also integrates a 5V fixed voltage controller and differential amplifier, which makes connecting to an 8-bit MCU, e.g. the XC886, extremely easy. Likewise, thanks to the integrated operational amplifier, the needed circuits for the shunt-current measurement are minimised, which ultimately leads to a cost and space-optimised design.

Fig. 3: Infineon offers scalable microprocessor and bridge driver families, which support cost/performance-optimised designs. For full resolution click here.

Availability

The new automotive BLDC motor drive kit is available under the name KIT_AK_TLE7184_V1 from Infineon and partner companies: https://www.infineon.com/bldc or https://www.hitex.com

The kit is not only an easy to use reference design for motor drives, but also an ideal training medium. It enables users to test out the advantages and disadvantages of block commutation with Hall sensors compared with sensor less control, and thus to decide which approach best suits their particular application. A video is also available from Infineon, which illustrates just how quickly and easily a complete motor design can be realised with the aid of the kit: https://www.infineon.com/cms/en/product/applications/Motor_Control_Drives/BLCD_CD.html

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Ralf

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