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AS5140H Datasheet(PDF) 18 Page - ams AG |
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AS5140H Datasheet(HTML) 18 Page - ams AG |
18 / 37 page www.austriamicrosystems.com/AS5140H Revision 1.4 18 - 37 AS5140H Data Sheet - D e t a i l e d D e s c r i p t i o n 7.5 Brushless DC Motor Commutation Mode Brushless DC motors require angular information for stator commutation. The AS5140H provides U-V-W commutation signals for one and two pole pair motors. In addition to the three-phase output signals, the step (LSB) output at pin 12 allows high accuracy speed measurement. Two resolutions (9 or 10 bit) can be selected by programming Div0 according to Table 20. Mode 3.0 (3.1) is used for brush-less DC motors with one-pole pair rotors. The three phases (U, V, W) are 120 degrees apart, each phase is 180 degrees on and 180 degrees off. Mode 3.2 (3.3) is used for motors with two pole pairs requiring a higher pulse count to ensure a proper current commutation. In this case the pulse width is 256 positions, equal to 90 degrees. The precise physical angle at which the U, V and W signals change state (“Angle” in Figure 12 and Figure 13) is calculated by multiplying each transition position by the angular value of 1 count: Angle [deg] = Position x (360 degree / 1024) (EQ 4) Figure 12. U, V and V-Signals for BLDC Motor Commutation (Div1=0, Div0=0) Figure 13. U, V and W-Signals for 2Pole BLDC Motor Commutation (Div1=1, Div0=0) Width : 512 Steps Width : 512 Steps CW Direction W V U 0 171 341 512 683 853 0 0.0 60.12 119.88 180.0 240.12 299.88 360.0 Position: Angle: Commutation - Mode 3.0 (One-pole-pair) Width : 256 Steps Width : 256 Steps CW Direction W V U 0 171 341 512 683 853 0 0.0 60.12 119.88 180.0 240.12 299.88 360.0 Position: Angle: Commutation - Mode 3.2 (Two-pole-pairs) 939 768 597 427 256 85 90.0 150.12 209.88 270.00 330.12 29.88 |
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