Help with ESC/Motor Problem

[Paulo uk]

I recently had my 100amp HV hoobywing esc die on me 10 seconds into a flight. When I inspected the heli, both the esc and the motor were cool to the touch. I contacted the vendor and they have replied telling me that the motor is pulling too much for a 100amp esc. This is where you come in:


Motor: Scorpion 4035-500 (the older one without the ribbed casing)

ESC: Hobbywing 100amp Fentium HV


Would you say that a 100amp esc is no good for this motor (and before you say it, I know the HW esc's arent exactly great)?


Thanks in advance

[Twister3D]

Does this help ?

Specifications

Stator Diameter ............................ 40.0 mm (1.575 in)
Stator Thickness ........................... 35.0 mm (1.378 in)
No. of Stator Arms ................................................ 12
No. of Magnet Poles ............................................... 10
Motor Wind ............................................. 9 Turn Delta
Motor Wire ..................... 21-Strand 0.29mm (29 AWG)
Motor Kv ............................................. 500 RPM / Volt
No-Load Current (Io) .................. 2.02 Amps @ 10 volts
Motor Resistance (Rm) ............................. 0.016 Ohms
Max Continuous Current ............................... 84 Amps
Max Continuous Power .............................. 3500 Watts
Peak Current (5 Seconds) ........................... 104 Amps
Peak Power ( 5 Seconds) ........................... 4600 Watts
Weight ...................................... 460 Grams (16.22 oz)
Outside Diameter .......................... 49.9 mm (1.964 in)
Shaft Diameter ............................. 5.98 mm (0.236 in)
Body Length ................................. 61.8 mm (2.433 in)
Overall Shaft Length .................... 100.0 mm (3.937 in)
Max Li-Po Cell Count ............................................ 12s
Recommended Timing ................................ 5 Degrees
Recommended PWM Frequency .......................... 8 KHz

[Paulo uk]

Not really, but thanks. I realise that max rating is a constant pull of 84amps, but that would assume I am using 100% throttle - which I wasnt.....


Paul

[acwman]

I would say that the percentage of throttle would not equate to what amps you would be pulling. There would be other factors such as what load is on the motor aswell.

Without logging equipment, you really would not know for certain exactly what amps you would be pulling.

When I had my logo 500 I had an 80 amp 80LV Jive which would cope with it spiking at 120+ amps. We all know that Juive esc can take more than quoted, but guessing with the HWing, maybe 100amps is the very top?

[Andy from Sandy]

Different brand and different way of working but that motor works fine when using a Kontronik Jive 80HV on 12S.

and before you say it, I know the HW esc's arent exactly great

If too much current were to be pulled the ESC should shut down not expire.

[Paulo uk]

Thats exactly what I thought... Thanks

[NiceBlades]

Paul, take it to avicraft and get Ali or someone to test the motor on some kind of wattmeter. My money is on the esc from HK though, was it new or have you used it before?

[Paulo uk]

It was brand new - good for 4 or 5 flights, but dont think it could handle my ninja tic tocs on Friday! Might well go and see Ali. Cheers.


paul

[scallybert]

If too much current were to be pulled the ESC should shut down not expire.

Ideally, but I wouldn't bank on it, with any brand of ESC. [Would you short the output terminals of a premim brand ESC to check this out ? I wouldn't...]

If you've had some succesful flights with a configuration, you can estimate the average current from flight time and pack size, or (preferably) how much charge has to be put back in the pack.

[cjcj1949]

Peak current isn't really limited by anything. Try stalling the motor and see how many escs survive. I agree they should. The motor windings will blow like a fuse eventually. You could try using a fuse as a check on current. When you do hard 3D you are effectively stalling the motor, or at least pushing the current to whatever something will stand. The suppliers have no idea that you have taken too much current through the esc. It is a good excuse that might be true. If you were taking a nice constant 80 amps you'd have a leg to stand on, but most people don't know what their peak currents are. I blame the lipos. Use an HK lipo, you'll be ok.