ATAVRMC300 Atmel, ATAVRMC300 Datasheet - Page 2

• 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

2.1
2.2
2
Stator
Rotor
AVR194
They also have a good weight/size to power ratio.
Such motors have little rotor inertia. The coils are attached to the stator. The commutation is
controlled by electronics. Commutation times are provided either by position sensors or by coils
Back Electromotive Force measurements.
In sensor mode, Brushless DC motors usually consist of three main parts: a Stator, a Rotor and
Hall Sensors.
A basic three phases BLDC motor Stator has three coils. In many motors the number of coils is
replicated to have a smaller torque ripple.
Figure 1
three elements in series, an inductance, a resistance and one back electromotive force.
Figure 1. Stator Electrical Configuration (Three phases, three coils)
The rotor in a BLDC motor consists of an even number of permanent magnets. The number of
magnetic poles in the rotor also affects the step size and torque ripple of the motor. More poles
give smaller steps and less torque ripple. The permanent magnets go from 1 to 5 pairs of poles.
In certain cases it can go up to 8 pairs of
Figure 2. Three phase, three coil BLDC motor stator and rotor
coil U
coil W
coil V
shows the electrical schematic of the stator. It consists of three coils each including
1 pair of poles
N
W
S
Rotor
Bemf W
Stator
L,R
poles.(Figure
U
coil U
coil W
coil V
L,R
Bemf U
Bemf V
2).
L,R
2 pairs of poles
N
S
S
N
V
Rotor
Stator
8138A–AVR–04/08