1512/1.5Y vs. 1512/2.5D?

[GriffinRU]

Motor with best efficiency is the perfect balance between copper and core losses. Copper losses associated with current and core losses with voltage. While it is easier to see copper losses (heat) it is not that easy to observe core losses.

So, it would be difficult to see much difference in efficiency among two motors because they run at different voltages and currents. If you compare under the same conditions they both will be not good, but if you put one in sweet spot then another will be in opposite.

Bottom line select you motor based on your gear ratio, battery voltage, ESC used and driving preferences.

[zeropointbug]

Copper losses and core losses would BOTH be heat.

This just has to do with these types of motors, there are many more motor technologies emerging now, although not in production yet, and not for RC, yet. The day will come when we have AC induction motors for RC, RaserTech has a wonderful new type of Induction motor with 4x the power of regular Induction motors. They would have much better lower end efficiency, like lower toque, which these BL motors are conditionally resistant too.

[GriffinRU]

Originally Posted by zeropointbug

Copper losses and core losses would BOTH be heat.

It is true for heat but it is not clear when they happen, because then current doesn't transfer in torque.

[GriffinRU]

Originally Posted by zeropointbug

Copper losses and core losses would BOTH be heat.

This just has to do with these types of motors, there are many more motor technologies emerging now, although not in production yet, and not for RC, yet. The day will come when we have AC induction motors for RC, RaserTech has a wonderful new type of Induction motor with 4x the power of regular Induction motors. They would have much better lower end efficiency, like lower toque, which these BL motors are conditionally resistant too.

Induction motors have their limits as well, and it is war against small percentage in efficiency, which is important for constant velocity applications, but for RC systems with wide dynamic range it would be very difficult. The complexity of control electronics will defeat benefits in efficiency.