User guide

AVR1607

8311A-AVR-07/10

Table 1-4. ATAVRMC303 jumper settings

Jumper Position Comment

J15 Open

Shunt_neg (Jumpers to be removed to

enable JTAG Programming)

J16

Open

Shunt_U (Jumpers to be removed to

enable JTAG Programming)

J17

Open

Shunt_V (Jumpers to be removed to

enable JTAG Programming)

J18

Open

Shunt_W (Jumpers to be removed to

enable JTAG Programming)

4.4 Power-supply

This firmware example has been configured according to a power-supply Vm=12V.

This power-supply must be able to provide up to 4A output current.

4.5 Motor

The BLDC motor provided inside MC323 and MC300 Motor Control Kit has the

following characteristics:

Manufacturer : TECMOTION

Number of phases : 3

Number of poles : 8 (4 pairs)

Rated voltage : 24V

Rated speed : 4000 rpm

Rated torque : 62.5 Nm

Torque constant : 35 Nm/A = k_tau

Line to Line Resistance : 1.8 ohm = R

Back EMF : 3.66 V/Krpm = k_e

Peak current : 5.4A

Maximum speed is 6900 rpm.

4.6 Technical Advices

4.6.1 Disconnecting the BLDC Motor

The BLDC motor must not be disconnected while it is running or while its coils carry

current. It is allowed to disconnect a BLDC motor if the PWM duty cycle is 0% and the

rotor is at rest so that no current is driven through the coils. Be careful, when stopping

the power supply or PWM, a BLDC motor with a high moment of inertia is able to run

for a relatively long time.