Freescale Semiconductor DRM079 manual Bi-Phase Bldc Motor Diagram

Bi-Phase BLDC Motor

1.4 Bi-Phase BLDC Motor

The brushless DC motor (BLDC) design for DC fan is commonly consist of a permanent magnet attached on the rotor and the stator phase coil windings are mounted on the motor shaft as illustrated in Figure 1-2. The BLDC has no brushes on the rotor and the commutation is performed electronically at certain rotor positions.

Hall Effect

Sensor Stator

Coil

Fan Hub

Axle Permanent

Magnets

Figure 1-2. Bi-Phase BLDC Motor Diagram

Variable Speed DC Fan Control using the MC9RS08KA2, Rev. 0

Freescale Semiconductor 9