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My Vacuum Cleaner Motor Doesn't Work. Could the Battery Management Circuit be the Cause?

jsg

Hello,

I am new in this forum. First of all, I would like send greetings to everybody. I am not a native English person, so I apologize if something is not right written or expressed.

Here is my question:

I have a portable vacuum cleaner that works with a batery that contains 2 cells 18650 Li-on, 2.200 mha each, 7.4V total voltage with BMS included. The device has worked well for some months, but now, when I switch on it (after checking the battery is fully charged) the motor starts turning for less than one second and stops. If I repeat the operation, the result is the same. Seems the BMS is cutting the current to the motor. I checked the connections and dissasembled the motor, cleaned it, but the result is the same. I connected the motor directly to the battery (previously dissassemble the bms) and it works perfect.

I would ask to the community if somebody has experienced this kind of problem and what could be the root cause and, if is possible, what could be the potential solution.

The device data is:

-Portable Vacuum cleaner

-Battery: 2 cells 18650 Li-on, 2.200 mha each, 7.4V serie connected with BMS 20A included

-Total power: 120W

-Power AC adapter (for charging battrty): 8.4V, 1A

 

Thank you in advance!

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  • 0

    Welcome. Please, don't concern yourself with mastering English. It is native to my tongue and I am still not very good at it.

    I rolled around you information in my mind and have some questions. My assumption is BMS is AC mains? I'm thinking BMS is an acroymn for building mains supply?

    Before failure confirm the vacuum operated on battery only and AC (with battery)? Would it operate without a battery installed. This may not be something that was checked. Operate, meaning it could be used as a vacuum.

    Now the vacuum operates on battery only and fails on AC(with battery)?

    After operating the vacuum on battery only. The battery can be recharged if plugged into AC. Any attempts to operate the vacuum with AC results in failure.

    Will the vacuum operate without batteries installed? Just running on AC.

  • 0 in reply to colporteur

    I think that BMS is battery management system - the circuit that protects the battery, manages right charging profile, prevents overload and overcharge, ...

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