Freescale Semiconductor DRM079 Manuale Utente Scaricare il pdf (Pagina 9)

Bi-Phase BLDC Motor

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

Freescale Semiconductor 9

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.

Figure 1-2. Bi-Phase BLDC Motor Diagram

Fan Hub

Permanent

Magnets

Axle

Hall Effect

Sensor

Stator

Coil

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Freescale Semiconductor DRM079 Manuale Utente Pagina 9