3.22EjemploDRM007 Co..
3.22EjemploDRM007 Co..
3.22EjemploDRM007 Co..
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Introduction and Setup<br />
Brief Overview to Brushless DC Motors<br />
The presented application uses three Hall effect sensors to sense actual<br />
position. The Hall effect sensors’ signals together give the six output<br />
values. These outputs are read by the microcontroller and the<br />
corresponding output voltage is generated by PWM outputs, as shown<br />
in Figure 1-4.<br />
HALL A<br />
0° 15° 30° 45° 60° 75° 90°<br />
HALL B<br />
HALL C<br />
PWM1<br />
PWM2<br />
PWM3<br />
PWM4<br />
PWM5<br />
PWM6<br />
Figure 1-4. BLDC Motor <strong>Co</strong>mmutation Signals<br />
These six PWM outputs are direct inputs to the 3-phase inverter. The<br />
motor windings are connected to the inverter. The three Hall effect<br />
sensors are connected to independent input capture channels of the<br />
microcontroller. See Figure 1-5.<br />
BLDC Motor <strong>Co</strong>ntrol Board for Industrial and Appliance Applications<br />
DRM007<br />
MOTOROLA Introduction and Setup 27
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