FUJITSU CAN-Motor Board MB91F267N - Manual (Page 65)

AN07-00180-3E
- 65 -
4 Try to rotate the BLDC motor
In these days, motors are indispensable in our daily life. Motors are now used in various places, for
example, air conditioners, compressors of refrigerators, turn tables of CD and DVD drives, and wipers
and door mirrors of vehicles.
This chapter provides descriptions about how to rotate the BLDC motor by using a microcontroller
macro.
4.1 What is the BLDC motor?
The BLDC motor is a DC brushless motor that is a type of motors. In distinction from generally known
DC motors, the DC brushless motor has no brush, longer life, and low electric noise, so it tends to be
suitable for miniaturization. Uses of the DC brushless motor are still increasing.
Rotation of both the DC motor and BLDC motor is controlled by the currents from a DC power supply.
The DC motor switches the direction of the rotor coil current by using brushes (communitator) to change
the magnetic flux for rotation control. On the other hand, the BLDC motor has no brush. As shown in
“Figure 4-1 DC motor/BLDC motor configuration examples”, it switches the directions of the stator coil
currents by using switches to change the magnetic fluxes for rotation control. To do this switching, the
microcontroller is used. For detection of the rotor position, hall elements are used.
Figure 4-1 DC motor/BLDC motor configuration examples
This board has a driver circuit, so you can starts rotating the BLDC motor immediately.
(a) DC motor configuration example (b) BLDC motor configuration example
Microcontroller
Driver circuit
Coil
Hall element