JM1U 3TY 6P test data

We have been testing the JM1U 3TY 6P and I am pleased with the results. We have made improvements in the thermal performance of the motors and they can now deliver more power at a lower winding temperature which reduces the copper losses. This motor can deliver more than 13kW continuously and has a specific power of more than 4.5kW/kg. A higher speed version may be able to reach a specific power of 6kW/kg stay tuned .....

We tested four props ranging from a 26/12 to a 37/12. The 34/10 test was run twice and you can see the two overlapping sets of data.

The following plot shows output power (kW) vs speed (RPM) vs efficiency (%). We measure the supply voltage and the supply current. The efficiency therefore includes the line losses, the controller losses, and the motor losses. In these you can see that the JM1 is most efficient at high speed and can deliver more power at higher speed. This motor was wound to deliver 13 kW continuous at 6500 RPM at 63V. The last points on the 26/12 and 30/10 curves are at full throttle. I am going to build a higher speed motor to test soon.






The following is a plot of efficiency (%) vs torque (Nm). You can see that the JM1 delivers approximately flat peak efficiency between 10 and 20 Nm of torque. In static testing there is not sufficient cooling to run the motor continuously over 21 or 22 Nm of torque.

Here is speed (RPM) vs Torque (Nm) vs efficiency (%). Please see the efficiency color scale in the chart above.

 Here is efficiency (%) vs speed (RPM).

Here is a gif of the data that gives you a sense of the efficiency surface.

We will be posting more testing data on the JM2S and a higher speed JM1 soon. We are also hard at work prototyping larger motors and generators. Please let us know if there is a motor or generator that we can help you with.

Cheers!