AN1913 Motorola / Freescale Semiconductor, AN1913 Datasheet - Page 12

• Manufacturer Part Number: AN1913
• Description: AN1913 3-phase BLDC Motor Control with Sensorless Back-EMF ADC Zero Crossing Detection using DSP 56F80x
• Manufacturer: Motorola / Freescale Semiconductor

System Design Concept
4.2 Sensorless Drive Concept
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The chosen system concept is shown below. The sensorless rotor position detector detects the Zero
Crossing points of Back-EMF induced in non-fed motor windings. The obtained information is
processed in order to commutate energized phase pair and control the phase voltage, using
Pulse-Width-Modulation.
Motor Characteristics:
Drive Characteristics:
Load Characteristic:
Table 4-3. High Voltage Evaluation Hardware Set Specifications
BLDC control with BEMF Zero Crossing using ADC
Max. Electrical Power:
Max DC-Bus Voltage
Control Algorithm
Phase Voltage:
Speed Range:
Phase Current
Input Voltage:
Speed Range
Optoisolation
Motor Type
Type
6 poles, three phase, star con-
Speed Closed Loop Control
nected, BLDC motor
2500 rpm (at 310V)
< 2500 rpm
310V DC
Required
Varying
3*220V
150 W
0.55A
380 V