3-phase brushless motor vector drives www.st.com/mcu Vector
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Motor control STR750F 32-bit ARM-based family
3-phase brushless motor vector drives
www.st.com/mcu
Vector control optimum cost
STR750F series super-integrated, single-chip 32-bit ARM7-based MCUs from STMicroelectronics. STR750F offers performance industry standard ARM7TDMI core service vector field-oriented) control algorithms. Vector control algorithms widely used high performance drives. They provide precise responsive speed control, guarantee optimized efficiency during transient operations. Practically, they also have advantage using same framework control asynchronous synchronous motor. This interesting development teams which have deal with various applications motor types. Finally, most sensorless algorithms based field-orientation methodology, which also interest when trying reduce cost drive.
Applications
Power supply 1.8V
Advanced high performance
Appliances Washing machines Dishwasher pumps Refrigerators conditioners Industrial Electric vehicles medium range industrial drives Office automation HVAC actuators fans Pumps Blowers Vending cash machines
reset clock control (MRCC)
Serial memory interface 64KB 256KB Flash 16KB 16KB SRAM channels Nested interrupt controller Advanced peripheral
interfaces
ARM7TDMI 60MHz
high speed UARTs
2.0B
Debug JTAG Advanced peripheral converter 10-bit 3.75µs 11/16 channels 16-bit timers (OC/IC/PWM) timer channels) dead time generation
Timebase timer 13/15 External interrupts Watchdog 32KHz Osc/RTC 38/72 I/Os
DMA: direct memory access RTC: real-time clock RWW: read-while-write SSP: synchronous serial peripheral
Based ARM7TDMI core, STR750F series offers:
High performance with 54MIPS 60MHz Embedded timers features perfectly suited vectorial control 3-phase brushless motors timer offers outputs Dead time generation Edge aligned center aligned waveforms Emergency stop Synchronization capability with Synchronization capability with other timers Programmable safety feature protect registers against unwanted writing 16-bit timer encoder interfacing with either 3.3V power supply
STR750F family
Through sophisticated combination several benefits ARMarchitecture motor control dedicated peripherals, STR750F family allows optimization overall performance execution reduction overall system cost.
Features benefits
Features Benefits Industry standard core with enough processing power (54MIPS) tackle most applications
Industry standard ARM7TDMI core running 60MHz
32-bit core architecture: barrel shifter 32-bit data path
Optimize variable resolution speed some multiplications Avoid multiple 16-bit loads when dealing with integral term when extended precision needed tachogenerator-based field-oriented control loop executed within 30µs
High on-chip integration motor control related analog/digital functions: powerful timers
Perfect 3-phase motor control applications Only load with 10kHz current sampling rate Additional flexibility customers need external regulator Real drive when used
Single 3.3V supply
Indirect rotor field-oriented control
Torque Flux Inverter
Slip estimator
Motor
Speed
domain
domain
3-phase brushless PMSM induction motor
Tachometer Proportional/integral Encoder
Vector control drive
Brushless motor safety
Features
Theory Changing reference coordinates from fixed stator coils moving rotor frame, equation describing motor then drastically simplified Method Clark Park transformations convert variables with fixed 3-axis, shifted coordinates into 2-axis orthogonal rotating coordinates
Safety critical registers locked prevent power stage damage (software run-away) Deadtime, outputs polarity, emergency input enable target registers read/write until lock activation (and then read-only protected) Once lock bits written, they cannot modified until next reset (write-once bits) Four lock levels offer full flexibility depending application (for example 6-step sine) main clock fails, internal oscillator (FREEOSC, ~5MHz average frequency) starts immediately Interrupt generated shut down safe restart sequences Emergency stop dedicated input
These last variables slowly varying values, which regulated means simple controllers then transformed back fixed stator windings frame using reverse transforms, shown diagram above
Requirements Intensive math computations (trigonometric functions, multiple regulators, speed calculation)
Minimum resolution required main control variables 16-bit with need 32-bit intermediate results, such integral terms Free load must kept remaining applicative tasks, such communication user interface
Benefits Strengthens control algorithm protect motor operation from external disturbance
Protects safety-critical registers case system hang Quick error diagnosis fault management Hardware protection power stage whatever status oscillator
STR750F family
STR750
channel timer
Fault Inverter
10-bit converter
Vbus
Speed/position feedback timer
Motor
Software
Hardware
From block diagram implementation
Benefits STR750 dedicated peripherals 3-phase brushless motor control timer features
Suitable phase brushless PMSM induction motors high voltage Sensored sensorless configurations
Motor control timer clock twice advanced peripheral frequency
Maximum input clock 60MHz provide 16.6ns edge resolution (12-bit @16kHz edge-aligned PWM)
Edge center-aligned patterns Double-update mode loss resolution center-aligned mode
Versatile output management Individually selectable polarity selection
Redirection circuitry 6-step drives 10-bit register with 16.6ns resolution 60MHz (i.e. from 16µs)
Programmable hardware deadtime generation
Done thanks additional interrupt cycle transfers
Burst mode Possibility update several registers peripheral using single stream Debug mode User selectable timer state case breakpoints (normal mode off; counter frozen switches off) Programmable reload rate
Dedicated emergency stop input Shuts down outputs issues interrupt Asynchronous operation (operates without clock source)
Speed feedback
Handled general purpose timers
STR750-MCKIT
Optimize your time market your motor just steps
Firstly, within minutes, kit's PMSM motor with standalone demo, open closed loop, using joystick STR750-EVAL control board. Then install graphical user interface (GUI) PMSM motor, induction motor open closed loop, selecting basic settings GUI. Apply changes real-time settings tune drive parameters feedback values from changed settings. Once familiar with demo, explore motor control library that supports (field oriented control) drive PMSM induction motors. library sources free help speed development motor control applications. With free 32KB evaluation version IAR's EWARM, open libraries, develop application, fine tune code parameters compile. Then fine tune application while running motor thanks real-time debugging capability Segger J-Link.
Application-specific requirements
Using same hardware firmware platform, possible incorporate application specific requirements taking advantage STR750-EVAL control board inverter board extension features (UART/LIN port, standalone operation potentiometer, wrapping area).
STR750F family
Inverter board STR750 controller board Debugger/programmer Isolation board PMSM motor SEGGER J-Link (Included) AI-JTAG/OPTO-1 (Optional) Induction motor ST7MC-MOT/IND
benefits
STR750-library
Optimized documented firmware libraries control both PMSM induction brushless motors provided free internet (www.st.com/mcu). These modular libraries support both types motors standalone mode using hardware STR750-MCKIT. source files provided free charge MISRA compliant, which helps compliancy with IEC60730.
Ready within minutes (requires Windows 2000/XP power supply motor) Same hardware firmware platform PMSM induction 3-phase motors Allows real-time control monitor from standalone operation through on-board push buttons trimmers Segger/IAR JLink (included) Flash programming real-time debug capability allows same hardware firmware platform used from evaluation advanced development stage Bypass connector external inverter power stage connection
Device summary
Motor control development tools Sales type item
STR750 library
Description
Optimized, documented firmware libraries control 3-phase PMSM induction brushless motors. open closed loop with STR750, sensor mode. libraries MISRA compliant. These standalone libraries STR750-MCKIT. isolation board included STR750-MCKIT also ordered separately. provides galvanic isolation between J-Link from Segger target board supplied high voltage. isolation board JTAG connectors (in/out). Available from distributors sales offices. Demonstration, evaluation development STR750 includes firmware, GUI, STR750-EVAL board (control board), voltage inverter board, isolation board (AI-JTAG/OPTO-1), Segger J-Link debugger/programmer 24VDC Shinano PMSM motor. Available from distributors sales offices. 240V/800W Selni 3-phase induction motor with STR750-MCKIT with ST7MC-KIT using induction motor default values (for evaluation purposes).
AI-JTAG/OPTO-1
STR750-MCKIT
ST7MC-MOT/IND
*RRP: recommended retail price
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STMicroelectronics January 2007 Printed Italy rights reser STMicroelectronics January 2007 Printed Italy rights reser
STMicroelectronics corporate logo aaregistered trademark STMicroelectronics group companies. STMicroelectronics corporate logo registered trademark STMicroelectronics group companies.
Full product information www.st.com Full product information www.st.com
Order code: BRSTR750MC0107 Order code: BRSTR750MC0107
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