There has been this tendency by those who dislike hub motors to make negative statments about the 600 series motor based on there experience with the X5 motor. The build differences are so great that such statements are just false.
Quick overview as to why the 602 motor is a improved design over the Xlyte 5 series motor and any performance comparison is unfair and wrong.
I'll start with this:
One must work within the capabilities of Xlite if one is going to get them to custom wind a motor, as we did at EnerTrac.
Yes the X5 and the 600 series motors are both radial designed motors using a slotted lamination, and both share the limitations of such a design.
But what has EnerTrac done to improve the 600 series motor while working within those capabilities?
First we got the lamination to be real cold rolled Si steel.
Second we worked with Xlyte to minimize the end copper, this is very important as the end copper contributes nothing to the rotation of the rotor and is just resistive heat losses
So lets look at some pictures of the X5 stator
Look at the ratio of copper in the steel vs end copper its almost .5 to 1. Also look at how much cooper is folded over.
Now lets look at the 600 series motor
Not only did we minimize the end wind but by having a wide stator the ratio of of copper in the stator to copper end losses are dramatically decreased
As one can see the differences between a X5 and the 600 series motor are so great that no experience with the X5 is relevant to the 600 series motor and statements making said comparisons are just wrong.