vec300 / 5kw air cooled bldc settings check?

[Jop Amsterdam]

hey fabulous people,

like said in a previous thread I sadly burned out my first 5kw air cooled GoldenMotor I put in my transport motorcycle conversion.

i finally got my new motor from China and I just wanted to run my current settings past you all to see if there is something I can still tweak to prevent further burnouts?

i have a 2/1 gear reduction through a planetary gearbox on a relatively heavy vehicle (270 kilo's without driver or load) so probably the main problem generating too much heat was that I previously did enable the EBS system which I now have disabled. But any further input is much appreciated. I run on 72v from 6 deepcycle AGM batteries.

note; these settings are already revised from my previous settings which burned out my previous engine, besides disabling the EBS I lowered the current phase amps by a lot, maybe by too much, so thats a thing to maybe look at?
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motor parameters

hall electrical angle: 120
phase angle offset: -120
number of pole pairs: 4
rated motorspeed rpm: 5000

voltage parameter settings

nominal battery voltage: 72
high voltage protection value: 90.0
high voltage protection exit value: 86.0
minimum work voltage: 50.0

low voltage protection value: 63.0
low voltage protection exit value: 2.0

low voltage protection enable: 1:enable
low voltage triggering current reducing: 66.0

clear undervoltage state while throttle off: 0:disable

current parameter settings

starting phase current: 15.0

maximum phase current: 280
maximum phase current duration (s): 10.0
rated phase current: 80.0

battery drawn current limit: 135.0

temperature settings

motor overtemperature protection enable: 1:enable
motor current limit temperature (level 1): 120
motor current limt temperature (level 2): 130
maximum motor protection temperature: 150
motor temperature protection exit value: 20

motor blockage settings

motor blockage protection enable: 1:enable
stall protection time (s): 2.0

throttle parameter settings

throttle voltage range protection enable: 1:enable
throttle mode selection: 1:linear

throttle maximum allowed voltage: 4.0
throttle upper voltage fault exit value: 3.5
throttle lowest allowed voltage: 0.4
throttle lower voltage fault exit value: 0.7
throttle maximum valid voltage: 3.2
throttle minimum valid voltage: 1.2

accel and decel parameter settings

acceleration (rpm/s): 200
deceleration (rpm/s): 600

regenerative braking

EBS enable: 0:disable

cruise control settings

cruise control enable: 1:enable
cruise control manual mode enable: 1:enable
cruise control automatic mode enable: 0:disable

cruise mode throttle minimum voltage: 1.2
cruise mode throttle minimum voltage: 30

fwd-speed-loop setting

forward speed ratio: 100

bwd-speed-loop setting

backward speed ratio: 80
reverse torque ratio: 100

3-gears func setting

disabled

boost func setting

disabled

speed throttle type

0:hall effect throttle
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thank you in advance for any advice you can give.

[Bikemad]

note; these settings are already revised from my previous settings which burned out my previous engine, besides disabling the EBS I lowered the current phase amps by a lot, maybe by too much, so that's a thing to maybe look at?

Hi Jop, here are my suggestions:

Decrease the maximum phase current duration and increase the maximum phase current:
maximum phase current duration (s): 10.0 5.0
rated phase current: 80.0 250.0

Lower the battery current to the rated setting:
battery drawn current limit: 135.0 100.0 (that's still 7.2kW @72V)

Lower each of the temperatures at which current limiting/motor protection occurs:
motor current limit temperature (level 1): 120 110
motor current limit temperature (level 2): 130 120
maximum motor protection temperature: 150 140

80% of your forward speed seems very fast for reverse:
backward speed ratio: 80 50 or even 25 or lower?

Now you have the temperature protection enabled, it should not be possible to overheat the motor. 

Alan
 

[Jop Amsterdam]

thank you!