AS5040(2004) データシートの表示（PDF） - austriamicrosystems AG
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AS5040 Datasheet PDF : 20 Pages
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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Brush-less DC Motor Commutation Mode
Brush-less DC motors require angular information for
current commutation purposes. The AS5040 provides U-
V-W commutation signals for one and two pole pair
motors. In addition to the three-phase output signals the
single channel (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 7.
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 9 and Figure 10)
is calculated by multiplying each transition position by
the angular value of 1 count:
Angle [deg] = Position x (360 degree / 1024)
Commutation - Mode 3.0 (One-pole-pair)
Width: 512 Steps
U
Width: 512 Steps
V
W
CW direction
Position: 0
Angle: 0,0
171
341
512
683
853
0
60,12
119,88
180,0
240,12
299,88
360,0
Figure 9: U, V and W-signals for BLDC motor commutation (Div1 = 0; Div0 = 0)
Commutation - Mode 3.2 (Two-pole-pairs)
Width: 256 Steps
Width: 256 Steps
U
V
W
CW direction
Position: 0
Angle: 0,0
85
171 256 341 427 512 597 683 768 853 939
0
29,88
60,12
90,0
119,88 150,12
180,0
209,88
240,12 270,00 299,88 330,12
360,0
Figure 10: U, V and W-signals for 2 pole BLDC motor commutation (Div1=1; Div0 = 0)
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