GoldenMotor.com Forum

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.

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
 

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
 

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?

Hi Charles,

Check if the 12 beep error code occurs at maximum or minimum throttle.
If it only occurs at maximum throttle, you will need to increase the Throttle maximum allowed voltage (V) until the error no longer occurs.
If it only occurs when the throttle is fully released, you may have to lower the Throttle lowest allowed voltage (V) until the error no longer occurs.

You may be able to restrict the maximum rpm by setting the Rated motor speed (rpm) to the required value and also setting the Forword Speed ratio (%) to 100%.

If you don't have a 3 speed switch connected, I would set the 3-Gears enable setting back to 0:Disable.

I would also expect the Number of pole pairs to be set to 4 (not 5) as the 5kW motor only has 8 magnets (4 pole pairs).

Alan