Golden Motor, HPM 3kW non-hub w/air-cooling

[speedmd]

Perfect! Yes get the proper gear like the one you listed. Also check surplus center. 3/4 inch center can be bored slightly to fit 20mm shaft and still have plenty of key engagement.
http://www.surpluscenter.com/Power-...ets/13T-3-4-BORE-35P-SPROCKET-1-2413-13-C.axd

Smaller pitch chain like a #219 or #35 will allow more teeth on a smaller diameter sprocket and allow for greater reduction ratios. #35 is common stuff in the states.

Post a video of it running when you have a chance to hook it up so we can see /hear it.

 

[stonezone]

Here's the shaft...

 

[stonezone]

I'm a bit away from making any battery decisions, but what would you guys recommend for a minimum C rating to get the most out of this motor/controller if I'm running HK lipos at 20s4p (unless 20s not be enough of a performance increase over 18s to justify the added expense).

Power is a priority since I figure I could baby the throttle to extend the range if I wanted and I know i'll regret not getting the best pack I can initially. I've read varying responses regarding C rating when batteries are running in parallel, and I want to max out what the controller can handle yet not blow cash on 65c batteries if a 4p 30c pack will do the same job.

tldr; is there a maximum C rating where I'm just wasting money and won't see any performance increase.

Sz

 

[Punx0r]

General advice is to cut HK lipo C-ratings at least in half for a realistic figure. Assuming your proposed 4P pack is made from 5Ah cells you'll have 20Ah. At only 10C you'd have 200A, which at 20S would give you just under 15kW. The Turnigy 20C packs are quite popular for ebike use, offering a good combination of price with reasonable performance.

 

[stonezone]

would I notice a major difference running 4p 65C batteries vs 4p 20c batteries (at 20s of course).

right now i have 12 6s 5000mah 20c batteries that I could build into an 18s pack but I'd rather part with it and upgrade to something that will max the controller... I'm just a bit confused at the delivery difference once you start running then in P.

 

[Punx0r]

What is the spec of the controller?

Higher C-rate batteries will give you less voltage sag under load, which is always nice, but may or may not be a significant issue. Environmental temperature plays a large role in acceptable battery performance.

Have a look through icecube57's test result for various Hobbyking lipo packs. It may give you a general idea of how the difference c-rate products compare to one another:

http://endless-sphere.com/forums/viewtopic.php?f=14&t=58210

 

[stonezone]

the rated current on the controller (vec300-72) 100A and the max is 300A

vec300-72 - http://www.goldenmotor.com/controllers/GoldenMotor%20FOC%20Motor%20Controller%20Guide.pdf

Also, will the extra voltage of 20s be worth the difference in cost of going 18s?

(reading that thread now, thanks!)

 

[speedmd]

Hi stonezone

You got a vec300-72 which is setup for 72 volts /18s lipo which is 75 volts off the charger. Not sure if it would see any issues with 20s, 84 volts. 30c bricks you should be fine at 18s 3p. Not sure you will notice much difference at these current demands with a 4p setup. You can always add. I want to hear this thing run.

 

[stonezone]

I don't need to run a higher C rated battery? I'm reading conflicting answers regarding C and paralleled packs.... I want to max the controller's thirst when I twist the throttle.

I want to hear it run badly as well... just working on my Tigging for a while more before I dive into my 4130 stock.

 

[speedmd]

In my limited experience with LIPO, they can dump extreme current momentarily. The more you crowbar the bricks, the shorter they live certainly. You may want to post the question on the battery side to get more input as to what you could expect from folks with direct experience/data on builds more like what your proposing.

 

[Messier31]

Hi All,

Im not a motor guy, but we'd opened up a 2018 manufactured HPM3000 golden motor and I thought I'll share the pics with you guys.

If time permits I will update this post with weights and measurements.

The pics are shared here:
https://drive.google.com/drive/folders/1Uv5UJ9mEwvaiHMZhNGqGeogY8sHiG_9X?usp=sharing

I apologise in advance for the substandard pic quality.

Cheers!

 

[damirsky]

Hi All,

Im not a motor guy, but we'd opened up a 2018 manufactured HPM3000 golden motor and I thought I'll share the pics with you guys.

If time permits I will update this post with weights and measurements.

The pics are shared here:
https://drive.google.com/drive/folders/1Uv5UJ9mEwvaiHMZhNGqGeogY8sHiG_9X?usp=sharing

I apologise in advance for the substandard pic quality.

Cheers!

thank you for the photos! if the motor is still open, can you please measure the lamination thickness? it is easy to do if you measure the thickness of the packet, calculate number of sheets and then divide tickness of the packet by number of sheets.