AVR601: atmel modular evaluation kits for motor control applications 1. introduction following the success of the mc100 and mc200 motor control demonstration kits, atmel is expanding the support for motor control ap plications and presents a new modular concept for motor control evaluation kits. as shown on figure 1, each motor application is now supported by two or three evalua tion boards: ? a power board providing the high current to the mo tor ? a processor board supporting one avr microcontroll er and the user interface ? an optional interface board which may be physicall y inserted between the power board and the processor board for signal conditioni ng. figure 1-1. system architecture processor board attiny861 atmega32m atxmega ... interface board (optional for specific purpose) power board mosfets spm b1 8 b2 8 b3 8 b4 8/16 a1 8 a2 8 a3 8 a4 8/16 usb 7803a?avr?10/08 8-bit microcontrollers application note
2 7803a?avr?10/08 AVR601 the offering includes one low voltage power board, three processor boards and the associated firmware. these four boards as shown on figure 2: ? mc300 is the low voltage power board (max 40v). ? mc301 is the processor board with the low cost att inyx61 ? mc303 is the processor board with the new high per formance xmega ? ? mc310 is the processor board with the atmega32m1 ( with can interface) ? more processor boards will become available in the future figure 1-2. motor control boards offering the atmel motor control interface bus (amci bus) s hown on figure 1-3 , allows the communica- tion between the power board and the processor boar d; most motor types are supported by this interface: ? bldc and blac motors ? ac induction motors ? switch reluctance motors ? stepper motors the amci bus uses three 8 bit connectors and one 8/ 16 bit connector. the interface supports up to four phases (u, v, w, x), each with half bridge control and both voltage and current feedback. with three phase moto rs, the free x channel can be used for a brake function. the interface also supports hall sensors, speed, te mperature and fault signals and also allows the control of the pfc (power factor correction) fr om the cpu board. all signals are logic sig- nals or analog signals scaled to reach the digital vcc. mc303 mc301 mc310 mc300
3 7803a?avr?10/08 AVR601 figure 1-3. amci motor control bus this bus can be used by any avr microcontroller to control a motor. this is an ideal interface to optimize the system cost and to identify the cheape st solution with the required level of performance. 2. processor boards as shown on figure 5 , each processor board has similar architecture and features; it includes: ? the corresponding avr processor, which handles the motor control application and the other tasks. ? a usb interface for communication with the host us ing atmel motor control pc software. the usb bridge is handled by an at90usb1287. ? a connector to plug in an optional atavrdb101 disp lay and human machine interface board. ? a potentiometer for providing analog speed target to the controller. ? programming and debugging connectors. ? the four amci motor control bus connectors.
4 7803a?avr?10/08 AVR601 figure 2-1. processor board placement the mc301 supports the attinyx61 family of low cost avr dedicated to motor control. it can also handle analog, twi or spi speed reference for rotational speed control. the mc303 supports the xmega ? family of high performance devices that can handle various functions while the cpu handles motor control inten sive algorithm. mc303 with db101 top mod- ule is shown on figure 6. the mc310 board supports the atmega32m1, a cost eff icient device providing can and lin communications in automotive and industrial designs . the board includes additional connectors for several communication interfaces: ? can ? lin ? rs232
5 7803a?avr?10/08 AVR601 figure 2-2. mc303 with db101 display and hmi top module 3. mc300 low voltage power interface this board, shown on figure 7, is intended to drive low voltage, medium power motors with fol- lowing specifications: ? voltage from 10 to 40 vdc. ? current up to 6 amperes (continuous load) the power board supplies the processor board. the board provides interface for hall sensors or ba ck emf information to run sensorless control of the motor. the mc300, mainly targeted to drive bldc and blac m otors, can also be used with other motors types like stepper motors.
6 7803a?avr?10/08 AVR601 figure 3-1. mc300 board with bldc motor 4. firmware package the flexibility of the modular hardware approach is supported by a growing software package. bldc and blac motors with sensor control are fully supported. sensorless control is also supported. please refer to atmel web site www.atmel.com/motorcontrol for availability of application notes and code examples. even if a specific combination of microcontroller, driver stage and motor type might not be avail- able from at the release, the similarity in fundame ntal functionality motors means that it is an option to extract relevant parts of the existing co de examples, and modify and reuse it in other implementations.
7 7803a?avr?10/08 AVR601 5. availability & ordering codes to simplify the order entry, complete evaluation ki ts are also available: mc320 includes the mc310 processor board, the mc300 power board and a small bldc motor (see figure 8) mc321 includes the mc301 processor board , the mc30 0 power board and a small bldc motor mc323 includes the mc303 processor board , the mc30 0 power board and a small bldc motor figure 5-1. mc320 evaluation kit mc300, 301, 303, 310, 320, 321 and 323 have the fol lowing ordering codes: ? atavrmc300 ? atavrmc301 ? atavrmc303 ? atavrmc310 ? atavrmc320 (includes mc300, mc310, 12v bldc motor and usb cable) ? atavrmc321 (includes mc300, mc301, 12v bldc motor and usb cable) ? atavrmc323 (includes mc300, mc303, 12v bldc motor and usb cable) the atavrdb101 display and human machine interface add on board is also available.
8 7803a?avr?10/08 AVR601 documentation available: avr430 - mc300 hardware user?s guide avr469 ? mc301 hardware user?s guide avr470 ? mc310 hardware user?s guide avr194 brushless dc motor control using atmega32m1 other documentation available: ? avr435: bldc/blac motor control using a sinus modu lated pwm algorithm ? avr440: sensorless control of two-phase brushless dc motor ? avr441: intelligent bldc fan controller with tempe rature sensor and serial interface ? avr442: bldc fan motor control with attiny13 ? avr443: sensor-based control of three phase brushl ess dc motor ? avr444: sensorless control of 3-phase brushless dc motors ? avr446: linear speed control of stepper motor ? avr447: sinusoidal driving of three-phase permanen t magnet motor using atmega48/88/168 ? avr448: control of high voltage three-phase bldc m otor ? avr449: sinusoidal driving of 3-phase permanent ma gnet motor using attiny261/461/861 ? avr452: sensor-based control of three phase brushl ess dc motors using at90can128/64/32 ? avr492: brushless dc motor control using at90pwm3 ? avr493: sensorless commutation of brushless dc mot or (bldc) using at90pwm3 and atavrmc100 ? avr494: ac induction motor control using the const ant v/f principle and a natural pwm algorithm ? avr495: ac induction motor control using the const ant v/f principle and a space-vector pwm algorithm ? refer to www.atmel.com for the complete and update d list.
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