Sevcon Gen4 size 4 with chineese BLDC

Electric Motors and Controllers
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kubetata   1 µW

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Joined: Jan 29 2019 5:31am

Sevcon Gen4 size 4 with chineese BLDC

Post by kubetata » Feb 07 2019 11:17am

Hi, im building an electric go-kart and i am at the point of programming the controller with the help of the authorized reseller and tech-support guy. Problem is we cant get the motor to behave like it should.
I got the motor from China, there is a rebrand version it from APS and in there https://alienpowersystem.com/shop/brush ... kv-25000w/ has the most information about the motor itself.
As far as i know it has 14 pole pairs, in the picture below is a snapshot of a scope measuring M1 related to M2 and U(out of UVW) related to ground without pull-ups.
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I would really appreciate the help of anyone who knows how to make a sevcon support a BLDC motor!
https://youtu.be/eB8Tq7bedew
This should give you a better idea of the problem..https://youtu.be/eB8Tq7bedew

kubetata   1 µW

1 µW
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Joined: Jan 29 2019 5:31am

Re: Sevcon Gen4 size 4 with chineese BLDC

Post by kubetata » Feb 11 2019 5:57am

https://www.youtube.com/watch?v=LxZSS1sovLk
This is the output to the motor phases 1 and 3 relative to 2.
The first issue i cant resolve is those huge voltage spikes when it should be at idle.
The second issue is that when i open the Vehicle interface in the DVT software it shows "desired RPM" to be around 4500 at full throttle and "actual RPM" to be ~450. Can somebody share a DCF file for a generic BLDC motor so i could compare the stuff Sevcon theoretically sent me?
Had to enable the internal pull-ups on the controller to receive proper hall sensor data.
20190208_121232.jpg

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flippy   100 kW

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Re: Sevcon Gen4 size 4 with chineese BLDC

Post by flippy » Mar 01 2019 4:00pm

i got half a dozen DCF's if you want. many from different motors.
Lithium beats liquid dinosaurs.

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ctirad   10 W

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Re: Sevcon Gen4 size 4 with chineese BLDC

Post by ctirad » Mar 08 2019 9:27am

Did you make the phase/hall (encoder) alignement? If so, check the motor constant is set correctly.
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