Not able to recognise this motor type

ganeshgovalkar · Apr 25, 2022

This is a table fan motor. The circuit is not working so I need to find a new one to start this again.
But I fail to get any online. Please help me to understand what I need to start this fan.

The fan has three wire: 1 - VDD 2- GND 3- PWM

Please find the attachments

for your reference.

Nigel Goodwin · Apr 25, 2022

As it says 24V DC on the label, presumably it's either a DC brushed, or brushless, motor?.

Pommie · Apr 25, 2022

Why is there a USB connector?

Mike.

ganeshgovalkar · Apr 25, 2022

You can charge phone using this. This is a rechargeable fan.

Musicmanager · Apr 25, 2022

This might have something to do with it ??

MM

Pommie · Apr 25, 2022

ganeshgovalkar said:
You can charge phone using this. This is a rechargeable fan.

Is the fan rechargeable and contains batteries or can you use the fan to charge other things? Looks like type A socket so I'm guessing the later.

Mike.

ganeshgovalkar · Apr 25, 2022

The fan is rechargeable and contains batteries.

Les Jones · Apr 25, 2022

Have you checked the battery voltage ? Checking that there is power available is always a good place to start.

Les.

ganeshgovalkar · Apr 25, 2022

Yes, I have used a multimeter to check that. battery is ok.

MaxHeadRoom78 · Apr 25, 2022

The coils seen through the bell housing appear to indicate a BLDC motor, the PC board appears to show it is PWM controlled.

ganeshgovalkar · Apr 25, 2022

so what to do?

Les Jones · Apr 25, 2022

You have not commented on the bare wire that Musicmanager pointed out in post #5 This could be that problem but without knowing what it is connected to we can't comment about it.
Do the LEDs light up ?
Measure the voltage between the ground and VDD2 wires going to the motor.
Check if the duty cycle of the PWM waveform to the motor changes when the speed control is adjusted. (You will need an oscilloscope to do that test.)

Les.

Nigel Goodwin · Apr 25, 2022

You should have a DC voltage on Vdd (presumably 24V?, and PWM pulses on PWM - do you have both of those?.

ganeshgovalkar · Apr 25, 2022

MaxHeadRoom78 said:
The coils seen through the bell housing appear to indicate a BLDC motor, the PC board appears to show it is PWM controlled.

It has 3wires

ganeshgovalkar · Apr 25, 2022

Nigel Goodwin said:
You should have a DC voltage on Vdd (presumably 24V?, and PWM pulses on PWM - do you have both of those?.

Les Jones said:

You have not commented on the bare wire that Musicmanager pointed out in post #5 This could be that problem but without knowing what it is connected to we can't comment about it.
Do the LEDs light up ?
Measure the voltage between the ground and VDD2 wires going to the motor.
Check if the duty cycle of the PWM waveform to the motor changes when the speed control is adjusted. (You will need an oscilloscope to do that test.)

Les.

Click to expand...

That goes to the battery for charging and getting power while there is no electricity. Led indicates battery charge. one LED 10% two LED 20% so on. No power at all in VDD2. Power adoptor working fine - showing 23-24v DC

ganeshgovalkar · Apr 25, 2022

Please suggest me to start this fan ..... I'm ok with no speed and battery backup

Les Jones · Apr 26, 2022

Tell is what the wires from CON 2 and Con 3 connect to. Post a picture of the etch side of the circuit board and draw a block diagram of the interconnections between all the parts of the fan unit. (The motor, the circuit board in your pictures, the battery, the power input and any other items that are inside the fan unit.)

Les.

MaxHeadRoom78 · Apr 26, 2022

The company that made the fan appear to also specialize in portable fans where AC power is not available.
It is looking like it is a form of ECM (Electronically comutated motor), if so could have internal electronics that receives the PWM

ganeshgovalkar · Apr 26, 2022

Les Jones said:
Tell is what the wires from CON 2 and Con 3 connect to. Post a picture of the etch side of the circuit board and draw a block diagram of the interconnections between all the parts of the fan unit. (The motor, the circuit board in your pictures, the battery, the power input and any other items that are inside the fan unit.)

Les.

ganeshgovalkar · Apr 26, 2022

Not able to recognise this motor type

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