Atmel AT32UC3 Series Application Note

Microcontroller Features • Brushless DC Motor • Space Vector Pulse Width Modulation using 6 PWM channels • Source Code for GCC compiler • Use AVR®32 Digital Signal Processing library (DSPLib) 1. Introduction This application note outlines a demonstration using a stand-alone application on an AVR32 ta ...

• AT32UC3A0512 • AT32UC3A0256 • AT32UC3A0128 • AT32UC3A1512 • AT32UC3A1256 • AT32UC3A1128 • AT32UC3B0256 • AT32UC3B0128 • AT32UC3B064 • AT32UC3B1256 • AT32UC3B1128 • AT32UC3B164 3. Related Items The software provided with this appl ...

• SVPWM : Space Vector Pulse Width Modulation • CW : Clockwise direction / CCW : Counter Clockwise direction • FCPU : CPU frequency • FPBA : Peripheral Bus A frequency ...

5.1 Introduction The most common method used to control DC motors is to modulate the voltage and especially the duty cycle. This is called the Space Vector Pulse Width Modulation (S.V.P.W.M). At first, this application note describes the S.V.P.W.M technique and then how to implement BLDC motor control ...

These combinations generates eight 3-phases voltages combinations Table 5-1. Switching configurations and output voltages of a 3-phase inverter WH VH UH Van Vbn Vcn 0 0 0 0 0 0 0 0 1 -Vdc/3 -Vdc/3 +2Vdc/3 0 1 0 -Vdc/3 +2Vdc/3 -Vdc/3 0 1 1 -2Vdc/3 -Vdc/3 -Vdc ...

Figure 5-3. Basic Space Vectors These 3-phases voltage combinations are converted by Clarke transformation and could be expressed in complex form. In sector (1), for example, So, (1) (2) (3) (4) (5) (6) d q V1 V2 V3 V4 V5 V6 jθ sm s V e V = * θ V1 d x V 2 d y ⎥ ⎥ ⎥ ...

Each space vector corresponding to WH,VH and UH could be expressed as a combination of Vds and Vqs (vector list in Figure 5-2). This mean for example (WH,VH,UH)=(1,0,0)=V5 5.2.3 Stepping increment and sampling frequency In this case, it ...

6.1 Flow Chart Diagram From the SVPWM technique, it is possible to distinguish several actions: • Sector Determination • PI Corrector • Space Vector Computation Before starting application development, it could be interesting to consider clock source reference: • Sector Determ ...

For an efficient implementation of SV-PWM, we use DSP library for cosinus and sinus computation. Once dx and dy are calulated, a set of 3 compare values Ta,Tb and Tc need to be calculated every PWM period to generate this pattern. Figure 6-2. PWM output switching pattern case in Sector 1 ) sin( ) ...

The Table 6-1 shows all duty cycle values for each sector number. For a sector number the duty cycle for the six half bridge is expressed by: UH = PWM0 and UL = T-(PWM0) VH = PWM1 and VL = T-(PWM1) WH = PWM2 and WL = T-(PWM2) The two rotating directions are described. In case of CCW direct ...