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81
Electric Boat Conversions / Re: VEC300 for boat: questions about regen, revers, hall effect throttle
« Last post by Bikemad on March 25, 2025, 05:02:17 PM »
Hi andto the forum.

I don't know if the motor actually produces the same amount of power in Reverse as it does in the default Forward direction, and I don't know how/if the Reverse switch function will affect the motor operation when the Hyperbola throttle mode (Boat throttle with Forward-Neutral-Reverse operation) is being used.

Regenerative braking (and also the Cruise Control function) does not usually work in reverse, so I suspect you will not be able to get regen working in the forward direction without reversing the current throttle operation, and you'll also need to reconfigure the motor to run in the opposite direction by default.

If you have to run it in Reverse, make sure that the "Backword speed ratio (%)" and the "Reverse torque ratio (%)" are both set to 100%.

Alan
 
82
Electric Boat Conversions / Questions about continuous regen
« Last post by Almex on March 24, 2025, 04:15:23 PM »
I am planning a conversion to electric of my 39ft Catana sailing catamaran with old, smelly 18hp diesels I am considering using two 7kw 72v axial flux  motors to  drive the existing sail drives directly, without gear reduction or the existing transmission  as the rated speed of 1950 rpm a good match for the prop speeds of 800-2000 rpm.  So two HTM07KW motors, one in each hull. Will these motors be okay operating for hours at a time? The motors will usually be operated at low power setting to extend the range, usually less than 2000 watts combined.  Usually the motors will only be used for a few minutes, to get the boat out of the marina unless there is no wind and we need to get somewhere..

So my main question is that I would like to know if using a third HTM07KW motor attached to a 12hp Kutoba diesel as a 72v generator with the same EZKontrol 800A controller as I am using for the drive motors. Can the controller handle regenerating  continuously? can the motor?  I hope for around 5-6kw from the 9KW (12hp) diesel at 1800- 2400 rpm.  The diesel is at it's tq peak from 2000-2600 rpm, so I would drive motor directly as it matches the rpm range  of the HTM07KW.  I already own the diesel engine.

I like that I would have three of the same motors and controllers as I'll be sailing long passages and could swap them if one failed. Keeping the generator light as possible is another reason I am considering this set up instead of a regular brushed alternator that would be much heavier. This generator would not be used too often, probably only a few times a year as the boat also has 1200 watts of solar, a hydrogenerator,  a wind generator and sails..  I am planning to use a 72v 300ah Lifepo4 battery for the motors.

83
Electric Boat Conversions / VEC300 for boat: questions about regen, revers, hall effect throttle
« Last post by Alpegu on March 24, 2025, 02:57:17 PM »
Hi, I've had the goldenmotor 5kW BLDC for a year now and it's been working okay, but not perfectly. I hope to have fixed most of the issues, which came from my suboptimal setup, but now I find myself with the following situation.

I have a hall effect throttle which, due to its peculiar design, can only be set up "backwards" on my boat - it will send a "reverse" signal when pushed forward and a "forward" signal when pushed back. Since it's not a potentiometer, I can't just swap the wires. This in itself isn't a problem, since my transmission was accidentally set up in a way that the motor's default reverse direction actually makes my boat go forward.

Now, my questions:
- Is it an issue to mostly be motoring in the motor's default reverse direction?
- Last year, I could never get regen to work, and reading other posts it seems that the fact I was in reverse might be the cause for this, as the controller doesn't seem to regen if it thinks I'm in reverse. Would it work for me to use the regen and "reverse direction" buttons when trying to get regen? As I understand it, the "reverse direction" button only changes what direction the motor considers forward, so shorting this would work?
- If I end up always being in reverse, what settings should I program onto the controller? 100% throttle speed in reverse? Anything else?
84
Electric Boat Conversions / Re: Water Cooling Mass Flow Rate?
« Last post by GrandeDan on March 14, 2025, 11:20:42 AM »
Quote from: Bikemad on March 13, 2025, 11:37:51 PM
I have no experience with the EZ Bluetooth App so I don't know what temperatures it actually monitors and displays. Are you sure that it's the motor that's overheating or could it be the controller?
 

I am positive it is the motor overheating. Through the GM monitoring app on WeChat, I can see them temp limit is 150degC for an alarm and 155degC for it to depower. 160 degC is Shutoff. I watch the live motor temp reading say 155degC. The controller also has temp limits to it, but I am reaching the motor temp limits before the controller.
Quote from: Bikemad on March 13, 2025, 11:37:51 PM

Does your coolant flow in series through the motor first and then through the controller?


Coolant flows from controller to motor but with a small temperature differential between the inlet and outlet temp of the coolant, I don't believe switching the order of this will help very much. Especially because the motor temp is far hotter than the coolant. a 3 deg temp differential will not cause a huge difference in heat transfer between motor and coolant.

Quote from: Bikemad on March 13, 2025, 11:37:51 PM
What rpm is the motor running at when it's drawing the 140 Amps?
If the motor speed is considerably lower than its rated 3,500 rpm it might be running too hot because the motor is being overloaded, in which case a smaller pitch/diameter prop (or possibly a gear reduction on the propshaft) may be required to reduce the load on the motor to allow it to operate at a more efficient rpm, which should then generate less heat in the stator windings.


Motor is running at roughly 3600 underload.

I would like to note that the cooling loop on top of the motor (where ALL the cooling is located) does stay cool. Cool enough I can touch it. But  moving down to the middle of the motor, it gets so hot on the outside casing that it could burn skin. I am wondering if GM just has an inadequate cooling system for their motor to run at full power for any extended period of time.
85
Electric Boat Conversions / Re: Water Cooling Mass Flow Rate?
« Last post by Bikemad on March 13, 2025, 11:37:51 PM »
I have no experience with the EZ Bluetooth App so I don't know what temperatures it actually monitors and displays. Are you sure that it's the motor that's overheating or could it be the controller?

Does your coolant flow in series through the motor first and then through the controller?

What rpm is the motor running at when it's drawing the 140 Amps?
If the motor speed is considerably lower than its rated 3,500 rpm it might be running too hot because the motor is being overloaded, in which case a smaller pitch/diameter prop (or possibly a gear reduction on the propshaft) may be required to reduce the load on the motor to allow it to operate at a more efficient rpm, which should then generate less heat in the stator windings.

Alan
 
86
Electric Boat Conversions / Re: Water Cooling Mass Flow Rate?
« Last post by GrandeDan on March 12, 2025, 12:02:19 PM »
Quote from: Ziper1221 on March 12, 2025, 02:02:02 AM
Check the outlet temperature of the water cooling. If the delta T is large, then you would benefit from moving more water. If the delta T is small, then you wouldn't, and the limitation is somewhere else.

The temperature difference between inlet and outlet is roughly 3 degrees F. It is not a large difference but with cooling, the more mass that flows through, the more heat will be exchanged. My issue though is that when I run the 5kW motor at 140 amps for an hour on a 52V setup, it still overheats. I would agree there is enough water cooling it but I should be able to run this hard for an hour. This is the only thing I can think of that would be fixable.
87
Electric Boat Conversions / Re: Water Cooling Mass Flow Rate?
« Last post by Ziper1221 on March 12, 2025, 02:02:02 AM »
Check the outlet temperature of the water cooling. If the delta T is large, then you would benefit from moving more water. If the delta T is small, then you wouldn't, and the limitation is somewhere else.
88
Magic Pie & Smart Pie Discussions / Re: Magic Pie 4 no wheel movement on a custom-built E-Trike
« Last post by Bikemad on March 11, 2025, 12:29:15 PM »
Hi Gilles,

Thanks for the update, it's good to know that you've managed to locate and rectify the problem.

I'm pleased for you that you now have it working correctly.

Alan
 
89
Magic Pie & Smart Pie Discussions / Re: Magic Pie 4 no wheel movement on a custom-built E-Trike
« Last post by Weimgi on March 11, 2025, 08:48:23 AM »
Hi to all,

after another couple of hours testing I finaly found the problem.
I have to admit it is quite stupid.

I bought the MP4 as a used kit and the wiring/connectors were wrongly connected.
The connector of the throttle was connected to the connector for the programminng cable,
which has the same pin configuration. I think when the seller did remove the kit, he assembled it wrongly.

I found out because you were talking about the brakes and I found it strange that this part of the
harness was not installed at all. And the voltages were showing nothing than they should...

Quite stupid, but more then happy that the trike is working perfectly now.

Thanks to all!

Regards,
Gilles
90
General Discussions / 48V 10kW BLDC Motor Stator
« Last post by Haywilly on March 10, 2025, 12:15:55 AM »
I'm curious if anyone knows what the stator's material is on the 10kW model. I assume it's laminated/silicon/electrical steel but I haven't been able to find any definitive answers. If it is that, I'm also curious how it's so cheap. From what I've seen, it costs $1k+ for a similar amount.
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