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I’ve started a week ago investigating about bldc motors, particularly used in coolers or pc fans. The first blog I found about them was prodmod’s:
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and it helped me a lot., that’s why I decided to keep part of his blog title. Unfortunately, the information wasn’t enough as I wanted to know exactly how the circuit inside the fan works. The result of my investigation is going to be showed gradually as this is a spare time activity so it is governed by free time and willpower (the later isn’t very strong on weekends). The main objective is to understand what’s inside the “two-coil fan drivers” and how to safely control DC fans that are based on them, but additional information will be posted as long as it is worthy. Be warned that English is not my first language (mother tongue) and although I’ve been using and studying it for many years, mistakes and grammatical errors will appear and I hope that if someone detects them while reading this, that person will be kind enough to remark my mistakes so that I can correct them and learn from them too.

Here you can see a block diagram of the controller/driver

Block Diagram
Block Diagram

Ok, now that we know what’s inside that chip, we want to know how it can be connected to the BLDC motor. The typical application circuit is shown below.

Typical application circuit
Typical application circuit

the 4 leads are numbered from left to right.

Now. we will look at some real bldc motors and drivers. On the next pictures there are three different kind of driver circuits:

1-BLDC motor with 4-leads chip and RPM sensor incorporated (smd transistor).

BLDC 3-Wire
BLDC 3-Wire

2-BLDC motor with 4-leads, 2-wire converted to 3-wire by means of a transistor (BC548, NPN, TO package).

BLDC 2-wire converted to 3-wire
BLDC 2-wire converted to 3-wire

3-BLDC motor with hall effect sensor (3-leads IC)  with RPM sensor and coil drivers (smd transistors).

BLDC 3-wire
BLDC 3-wire

The second picture showed a converted 2-wire fan to a 3-wire fan, the results are shown below when connected to the chassis monitor.

Connected FAN
Connected FAN

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