User Manual

System Design Concept
3-Phase BLDC Motor Control with Sensorless Back-EMF, ADC, Zero Crossing, Rev. 3
12 Freescale Semiconductor
Preliminary
The introduced BLDC motor control drive with Back-EMF Zero Crossing using AD converter is designed as a
system that meets the following general performance requirements:
Table 4-1. Low Voltage Evaluation Hardware Set Specifications
Motor Characteristics:
Motor Type
4 poles, three phase, star con-
nected, BLDC motor
Speed Range: < 5000 rpm (at 60V)
Maximal line voltage: 60V
Phase Current 2A
Output Torque 0.140Nm (at 2A)
Drive Characteristics:
Speed Range < 2000 rpm
Input Voltage: 12V DC
Max DC-Bus Voltage 15.8 V
Control Algorithm Speed Closed Loop Control
Load Characteristic: Type Varying
Table 4-2. Low Voltage Hardware Set Specifications
Motor Characteristics:
Motor Type
6 poles, three phase, star con-
nected, BLDC motor
Speed Range: 3000 rpm (at 12V)
Max. Electrical Power: 150 W
Phase Voltage: 3*6.5V
Phase Current 17A
Drive Characteristics:
Speed Range < 3000 rpm
Input Voltage: 12V DC
Max DC-Bus Voltage 15.8 V
Control Algorithm Speed Closed Loop Control
Load Characteristic: Type Varying