Our e-bike controller and all outputs have 80+ volts

[BlacklineVW]

Hello everyone,

My neighbor would like to make a go-kart for his children, the children have restored an old go-kart themselves and we wanted to install a motor on it. He has an Electric motor 72V 3000W high speed hub motor with brushless controller and pedal accelerator, for electric scooter, electric bike, motor go-kart ATV bought on amazon and a 72volt lipo battery.

He tried to get it working, but no success, he came to ask me, but it is all plug and play, so we started measuring a bit and what raises the following questions.

When the battery is fully charged, 80+volt comes out, on the entire printed circuit board there is a voltage of 80+volt, including the outputs of the accessories. This is not allowed, is it? There is also voltage on the 3 phase wires.

If I measure a continuity test on the motor housing and the 3 phase wires, it beeps, is that allowed?

We ordered another controller which we tried but without success, the motor just won't turn.

Hopefully someone has an answer.

 

[indianajo]

If I measure a continuity test on the motor housing and the 3 phase wires, it beeps, is that allowed?

No. Phase to phase only, .4 to .8 ohms. No continuity phase to housing.
My "48 v" battery reads 54.6 at full charge. Same proportion for 72 v batteries.
No way a 72 v combination is class 1 or 2. My scout friends in 1958 were threatened with arrest if they continued to drive their 2 1/2 hp go cart on their street. Old Toro reel mower motor. Sounds appropriate to me. No brakes, no lights, only 30" tall and hence invisible to autos. Black motor, weathered brown wood. Hope you have a go-kart track available.

 

[harryS]

Continuity between the three phase wire and the motor housing? Sounds like a short circuit.

 

[Slaphappygamer]

Oh that’s no good. Did the motor ever work? If no, then I’d return it and try another vendor.

 

[BlacklineVW]

Oh that’s no good. Did the motor ever work? If no, then I’d return it and try another vendor.

no, we didn't get the engine running, next post I'll have some pictures of the setup

 

[BlacklineVW]

Thanks in advance everyone for your quick responses!!

I have added some pictures of how the setup is. Are we missing something? with this setup the engine does not run and we hear or smell nothing,
there is 80+ volts on the entire pcb. We can only connect the throttle or throttle lever of the steering wheel. Neither work. (the phase wires were connected, not in these photos)

 

[Slaphappygamer]

Try this flow chart.

If this doesnt work, then probably a bad motor. Again, as previously mentioned, you shouldn’t have any shorts between the phase wires and the motor housing. That alone would be enough for me to send the motor back.