Search found 13 matches

by fictivedesigns
Sep 19 2020 4:28pm
Forum: Motor Technology
Topic: DIY VESC and BLCD basic questions
Replies: 2
Views: 300

Re: DIY VESC and BLCD basic questions

- The firmware for my controller defines a deadtime of 750ns. I can measure this on the rising edge for the high side FET but on the low side it is not so good. I'm afraid that this is a risk for a shottrough ? Hi Georg, in your second photo the high side FET has finished turning off by ~160ns afte...
by fictivedesigns
Sep 16 2020 8:01pm
Forum: Motor Technology
Topic: Yasa/Makani controller teardown
Replies: 15
Views: 474

Re: Yasa/Makani controller teardown

Axial, the docs are here: https://blog.x.company/sharing-makani-with-the-world-the-energy-kite-collection-ea49398df78c Unfortunately it doesn't look like they released every single internal document. I wasn't able to find any controller source files, but if you just want to use the firmware it's 100...
by fictivedesigns
Sep 15 2020 11:44pm
Forum: Motor Technology
Topic: Yasa/Makani controller teardown
Replies: 15
Views: 474

Re: Yasa/Makani controller teardown

Am running the tiny power stage immersed in dielectric fluid for a bit more cooling. Here is is, stable at 10 rpm with 18 W from a DC supply, sensorless: http://rp.to/7t01q Nice progress! Interested to see what you plan on doing with these motors. ~32kg mass, ~200kW peak could make a lot of fun stu...
by fictivedesigns
Sep 15 2020 10:54pm
Forum: Motor Technology
Topic: Yasa/Makani controller teardown
Replies: 15
Views: 474

Re: Yasa/Makani controller teardown

Check out the design doc by Andrew Goessling for this inverter here starting page 147: https://storage.googleapis.com/x-prod.appspot.com/files/Makani_TheEnergyKiteReport_Part2.pdf A few things: The SiC modules are 1700V rated and the 1100V caps are put in series to handle the voltage. The ceramic DC...
by fictivedesigns
Sep 10 2020 11:51am
Forum: Motor Technology
Topic: Yasa/Makani controller teardown
Replies: 15
Views: 474

Re: Yasa/Makani controller teardown

Wow, nice teardown and nice score. This is insanely interesting! Here are some of my thoughts: I saw that each film cap is rated to 1100V, so unless they are connecting caps in series that limits their max working voltage to 8-900V (due to thermal derating; it's 80% VRated at 80C). 1100V also lines ...
by fictivedesigns
Sep 06 2020 8:26pm
Forum: Motor Technology
Topic: Motor identification
Replies: 4
Views: 144

Re: Motor identification

Are you referencing this paper? http://www.hitachi.com/rev/pdf/2004/r2004_04_102_3.pdf The alternator here is pretty much standard, maybe with a small amount of permanent magnet assist. There is a rotor field winding powered by slip rings. You need to power this and it works pretty much the same way...
by fictivedesigns
Sep 05 2020 8:55pm
Forum: Motor Technology
Topic: Motor identification
Replies: 4
Views: 144

Re: Motor identification

This is a separately excited DC motor- your rotor connections are A/B and your field connections are C/D. There are controllers out there that can take advantage of SepEx motors, or you could just connect C/D to a battery and use A/B like a traditional brushed DC motor. E/F could be a bunch of thing...
by fictivedesigns
Aug 27 2020 7:24pm
Forum: Motor Technology
Topic: Build a controller for an Alta OEM motor and inverter?
Replies: 16
Views: 791

Re: Build a controller for an Alta OEM motor and inverter?

The SPI interface along with the motor sensor offset parameter indicates that the sensor is being used in the absolute angle mode, which makes sense- you really want as much angle information as possible for high-performance motor control. There's a reason you only see absolute encoders and resolver...
by fictivedesigns
Aug 18 2020 1:23am
Forum: Motor Technology
Topic: Build a controller for an Alta OEM motor and inverter?
Replies: 16
Views: 791

Re: Build a controller for an Alta OEM motor and inverter?

Chances are your inverter and encoder use the absolute angle interface. It's SPI. The upper left-hand connector labeled ENC has 2 labels, RACS and RACLK which are typical SPI signals. I think VESC has some kind of support for ams encoders but if it doesn't it's possible to write some code to read th...
by fictivedesigns
Aug 15 2020 6:33pm
Forum: Motor Technology
Topic: Build a controller for an Alta OEM motor and inverter?
Replies: 16
Views: 791

Re: Build a controller for an Alta OEM motor and inverter?

Your PM300CG1C065 IGBT brick has 6 integrated gate drivers for each of the 6 switching IGBTs in its 3-phase bridge. Those Avago parts are optoisolators used to send signals to those integrated gate drivers and provide galvanic isolation from LV to HV. The 4 transformers along the bottom of the drive...
by fictivedesigns
Oct 19 2016 2:19am
Forum: Motor Technology
Topic: Inexpensive moderate-inductance short-can BLDCs?
Replies: 4
Views: 758

Re: Inexpensive moderate-inductance short-can BLDCs?

As an update: I bought the L5055-400, and it turns out to have an inductance of 47uH phase to phase. Perfect!

David
by fictivedesigns
Oct 12 2016 6:32pm
Forum: Motor Technology
Topic: Inexpensive moderate-inductance short-can BLDCs?
Replies: 4
Views: 758

Re: Inexpensive moderate-inductance short-can BLDCs?

Essentially core iron mass, and the Kv of the motor are your two big indicators. The higher the Kv, the lower the inductance. The higher the core mass, the higher the inductance. Intuition tells me that is the case, but from the two samples I have the actual motor design appears to matter far more....
by fictivedesigns
Oct 11 2016 6:46pm
Forum: Motor Technology
Topic: Inexpensive moderate-inductance short-can BLDCs?
Replies: 4
Views: 758

Inexpensive moderate-inductance short-can BLDCs?

Hi all, tl;dr: Are there any good sources for short can (<55mm from mounting plate to end of bell), moderate to high inductance (> 40uH phase to phase) BLDCs? Ideally the motor shaft is >= 6mm and the motor diameter is <= 50mm. First, some background. I'm an undergrad developing a dual motor control...