ATAVRMC300 Atmel, ATAVRMC300 Datasheet - Page 5

• Manufacturer Part Number: ATAVRMC300
• Description: BOARD EVAL LV MOTOR CONTROL PWR
• Manufacturer: Atmel
• Series: AVR®r

Specifications of ATAVRMC300

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATmega32M1
• Primary Attributes: 3-Ph BLDC, Brushed DC, Stepper Motor Driver Board, 40V, 6A
• Secondary Attributes: Requires ATAVRMC301, ATAVRMC303, or ATAVRMC310
• Processor To Be Evaluated: ATmega32M1
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8138A–AVR–04/08
Figure 5. Commutation steps and rotating field
Commutation creates a rotating field. Step1 Phase U is connected to the positive DC bus volt-
age by Q1 and Phase V is connected to ground by Q4, Phase W is unpowered. Two flux vectors
are generated by phase U (red arrow) and phase V (blue arrow). The sum of the two vectors
give the stator flux vector (green arrow). Then the rotor tries to follow the stator flux. As soon as
the rotor reaches a given position, the hall sensors state changes its value from “010” to “011” a
new voltage pattern is selected and applied to the BLDC motor. Then Phase V is unpowered
and Phase W is connected to the ground, resulting in a new stator flux vector ‘Step2’.
By following the commutation schematic
vectors corresponding to the six commutation steps. The six steps provide one rotor revolution.
coil U
coil W
coil U
coil W
coil V
coil V
coil W
coil V
coil V
001
101
Hall_H3H2H1
Step1
Step5
Step3
100
011
010
110
coil U
Figure 3
coil W
coil U
coil V
coil U
coil W
coil W
coil V
coil V
and Table 1, we obtain six differents stator flux
Step2
Step6
Step4
AVR194
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