Recent Posts

Pages: 1 [2] 3 4 ... 10
11
General Discussions / Please help with my 1st build, BBSO2
« Last post by BOTE-E on September 07, 2024, 11:50:48 AM »
I didnt pay attention and purchased BBOS2 motor and found out that it don't fit.

My bike have a BB30 bottom bracket, I don't have caliper but with eye-balling on ruler, BB width 83.25mm, inner diameter 42mm.

my bike is Cannondale BOTE1, it’s a fat bike :(

What do I need to do to salvage this build? Please help me.

Can I use the Lekkie , Press fit 41mm BB86/92 adaptor for 68mm, to make the BBOS2 fit my bottom bracket?

It’s my fault for not paying attention and didnt do much research on it.
Please help me with my build, thank you
12
General Discussions / Re: HPM3000 motor overheating
« Last post by Stinky on September 05, 2024, 05:45:23 AM »
It seems that I found the reason why motor got so hot. The EZ-A48400 controller was configured wrong. It was set to AC motor instead of BLDC. When changing this parameter the motor runs much cooler.

I still have problems to control the motor from CAN. It runs in backwards direction but not forward. Does anyone else use the CAN protocol to control the EZ-A48400 controller?
13
General Discussions / Re: Air Cooled vs Watercooled BLDC Motor
« Last post by Pontus on September 03, 2024, 09:00:43 AM »
Hi there,

First of all : Unless the motor rpm somewhat matches the rpm of the prop, you need some kind of gear box.

The peak power of the GM 10 Kw BLDC is at around 3700 rpm, which is way to high for a 14x18, so unless there's gearbox inside the leg, one would bee needed.

I've gone through the same thing although with the motor mounted as an inboard, thinking that the great torque of an electric motor would solve that. Even though I had water cooling blocks mounted on the VEC-500 if sometimes got above 75 °C.

During my build of a reduction gear I swapped the VEC-500 for the EZ-kontrol B48-1000. Now the controller barely gets over 40 °C after several hours of use and the motor tops at 65 °C.

All reasoning and calculations about the reduction gear is documented in this blog post. Google translate available.
14
Electric Boat Conversions / Re: EzKontroller and regen on a boat
« Last post by Pontus on September 02, 2024, 04:18:55 PM »
You can adjust the outgoing current from re-gen, thus varying the brake power.
Although as of my understanding there's no way to do this without stopping the motor, applying the new settings and then starting again.
15
General Discussions / Re: HPM3000 motor overheating
« Last post by Stinky on August 26, 2024, 12:36:17 PM »
Hi Bikemad,

Thank you for your answer. It seems that the motor is not very efficient when running with low load and low speed. When looking at Dynomometer data it is seen that efficiency is around 50% when producing 371W mechanical power. That is around 371W heat. Best efficiency (92%) is at 3180 W mechanical power which uses 3458 W electrical power. The heat is 278W. So it runs cooler when the load is high? Have I misunderstood something or is this really the case?

 I will check if the cooling fan works as expected specially in revering direction. 
16
General Discussions / Re: HPM3000 motor overheating
« Last post by Bikemad on August 26, 2024, 11:48:55 AM »
Hi Stinky andto the forum.

I'm not sure what shape the cooling fan blades are on that motor but they may be optimized for maximum airflow in the forward direction at higher rpm.
If you have just been running the motor at a set speed of 1,000 rpm, and also in the reverse direction, this might explain why is is getting so warm.

Your 2 Amp current draw (~100 Watts of power) seems reasonable to me, considering that the Dynomometer data indicates a current draw of 14.87A @ 4489 rpm with a shaft load of just 0.7Nm.

After checking the VEC controllers' default settings, I would say that your motor is not "overheating" if it has only reached 80 degrees after an hours use.  The VEC controllers will only start limiting the current when the motor temperature exceeds 120 degrees, and will eventually cut the power completely if the motor temperature exceeds 150 degrees to protect against overheating.

Unfortunately, I have no experience with any of the EZ Kontrollers (or CAN-BUS protocol), so I don't know why your motor does not run in the forward direction when using the 0C01EFD0#800CE88003000001 (1000RPM) CAN-BUS command.

You may need to contact GM China (sales@goldenmotor.com) for further assistance with the CAN-BUS related problem.

Alan
 
17
General Discussions / HPM3000 motor overheating
« Last post by Stinky on August 26, 2024, 07:34:36 AM »
Hi,

I have bought a 3kW motor (HPM03KW) and controller EZ-A48400. I have connected everything and started the motor. Everything works fine BUT the motor heats up very quickly. In 1 hour it is 80 degree Celsius. There is no load on the output shaft. It is rotating freely. The bus voltage is 48 V and bus current is around 2 amps. Is this normal?

Also it is not possible to run the motor in forward direction when operated from CAN. Backwards works fine.

0C01EFD0#800C187903000001 (-1000RPM)  This command works, rotates the motor
0C01EFD0#800CE88003000001 (1000RPM)   This command does not work, motor does not start.
18
Magic Pie & Smart Pie Discussions / Re: Single Side Mount
« Last post by Bikemad on August 13, 2024, 10:20:12 PM »
Hi andto the forum.

Here are a few 4 wheel drive vehicles that have been built using Magic Pies but they are all secured using both ends of the axle:







Unfortunately, there are no decent drawings showing the construction of the Magic Pie but the following should help:

Rear Magic Pie III Stator

Rear Magic Pie III Axle

Front and Rear Magic Pie Dimensions

Single side mounting suggestion

Bearing information

The Magic Pie axles have a 14mm thread with 10mm flats.

Hopefully the above information will be helpful to you.



Alan
 
19
Magic Pie & Smart Pie Discussions / Magic Pie rotor and Stator Improvements?
« Last post by Grasshopper on August 13, 2024, 11:15:14 AM »
Are the basic rotors and stators the same for all Magic Pie motors since inception?  My project requires a custom shaft and bearing setup as well as the supporting parts so changes to those are not important.  The controller will be mounted externally.

The basic magnet and stator rings will be mounted to a custom rim and hub but I want to use the best setup for high amps at 52v.
20
Magic Pie & Smart Pie Discussions / Single Side Mount
« Last post by Grasshopper on August 12, 2024, 06:32:33 PM »
Working on a quad bike design with 4 wheel drive, 4 wheel steering and full suspension.  Due to its large mostly open center space and direct drive, the Magic Pie motor looks perfect except it would need a new axle and bearing setup.  I’d probably remount the controller externally.

In order to proceed, it would be nice to have an installation drawing of the stator, rotor and connecting parts including the shaft and bearings.  If these are not available, I’ll buy a motor, take it apart and measure it.  Or perhaps someone out there might have a scrap one they’d be willing to sell cheap or donate.

The design will be open source and I’m an old engineer doing it to keep the cobwebs out.

Comments?
Pages: 1 [2] 3 4 ... 10