A Complete Teardown of atomberg BLDC Exhaust Fan

atomberg technologies is a Mumbai, India based company developing energy-efficient home appliances using BLDC motor. Some of their Products are Ceiling Fans, Exhausts, Mixer, now they are coming with Smart Locks as well.

I know them because of the ceiling fans only, when I saw their website while writing this blog, I came to know that they make Mixer and Smark Locks as well.

I have heard a lot about them and always wondering what kind of tech they might be using, are they building products in India or just buying from outside and selling here in India, so I have decided that I will do a few of their products teardown and see how they have designed and built the over all product.

In the atomberg series we have their Exhaust Fan Studio as the first candidate.

Let us go Inside 🙂

I like the packaging, comes with an addition carton box on top of their product package. Nothing Fancy.

IIT Bombay Alumni Venture, point to be noted everyone.

O o, Imported by atomberg technologies, Made in China.

Hmm. I wasn’t expected this 🙁

Anyways, let us see further.

this is the front plate, looks like stainless steel cover for the look. If you want you can also remove it easily, you will get a white plate inside.

Gap is there to pull the air inside.

backside flaps, they open when the exhaust is working and will close when not in use, protects a little bit from dust to go inside and also from birds, insects, etc.

one flap got damaged from me(the one I am holding) when I was pulling it out, looks like very delicate.

Product Model Name and Serial number Sticker

2 wires are there with rating 300V, 0.5Square mm wire

You can easily remove the Flap portion by pulling it off.

Font plate also you can remove by sliding the plate on the side. See how it attaches to the hooks, you will get an idea.

to get the motor, you need to remove these screw, not a big deal.

you will be able to get Flan blade with the motor out.

BLDC motor Spec: 6.5W, EC-APC15-2-2MDC, looks like manufacturing is July 2023, it can take 220-240V @50Hz(May be typical rating as in India we will get 250-260V AC easily)

You can pull the Fan blade easily with some force, be careful, you might get hurt by the blade

Permanent Magnet on the rotor

Winging and the drive circuit, electronics engineers are mostly interested in this part, right?

I was really surprised to see 2-wire BLDC, really, I have always seen 3 wire BLDC motor. When I saw this I spend good amount of time to study types of BLDC Motors and looks like there exists a 2-wire BLDC motor also.

I removed the shaft easily but I was not able to remove the plastic part so I had to cut it.

atomberg BLDC Drive PCB

In this circuit(PCB image below), on the left side you see, black NTC for reducing the inrush current the MOV(blue) and fuse on the other side of the PCB, to protect from over current and over voltage spikes then it passes to high voltage capacitor and choke for further filtering.

after that it goes to the bridge rectifier via L2 and L2 ferrite beads and then a bilk capacitor before hitting to the Power Converter IC KP15052SP.

It was not at all easy to read the part number of the power converter with some angled lighting and my magnifier I was able to see, it’s KP15052SP (Kiwi Instruments IC, never heard of this name)

KP1505X family is a high performance Switch Mode Power Supply Switcher for low power off-line application with minimum components in typical buck solution. This family has built-in high break down voltage MOSFET to withstand high surge input.

Unlike conventional PWM control, there’s no fixed internal clock in KP1505X family to trigger the GATE driver, the switching frequency is changed according to the load condition.

KP1505X integrates functions and protections of Under Voltage Lockout (UVLO), Cycle-by-cycle Current Limiting (OCP), Output OVP, On-chip Thermal Shutdown, Over Load Protection (OLP), VDD OVP with Auto Recovery Mode Protection, etc.

Bridge Rectifier(MB10F) for 1st stage of the circuit which is nothing but a AC to DC Power Supply.

The output of the AC to DC converter goes to a strange 8 Pin IC (U2), part number was not at all visible, could not read at all, but looks like driver IC (I will investigate further, once I get to know I will update the blog).

Very near to the IC there are 4 pads given two are named as VCC(may be Main DC voltage), FG(may be FAN Ground). See the pads of J1 4-Pin connector.

Some kind of programming connector? No idea as of now, but I will figure it out soon.

That’s all in the atomberg’s BLDC Exhaust Fan Teardown, hope you liked the details and got to learn something new.

Let me know, if your enjoyed reading the blog or not. I will be happy to receive your messages.

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I am currently working as an embedded systems design consultant helping companies build custom embedded products and develop test automation solutions for their PCBs.

If you have any feedback about the blog, you can share it in the comments below or contact me directly.

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