@ RS,

Thanks big time for the 3 coil window motor pics and Hall timing arrangement. It would be of use to know how the 3 coiler stacked up performance wise versus the usual 2 coil window motor.

I assume that the duty cycle of the Hall switch timing method can be altered by the positioning of the Hall switches in and out with the timing dependent on the initial positioning of the timing rotor. True?

My main reservation in using the Hall method with the Neo timing wheel is the impact of the reversing coil fields on the timing rotor fields. The existing ZFM timing and reed switches are definitely impacted by the coil fields.

Anyway, the next ZFM build will probably start coming together late summer - the timing method (Hall or Optical) can wait a bit until things start coming together.

@ Aaron,

Did a short experiment varying the ZFM voltage input (24v, 36v, 48v, 54v and 60v) under a constant torque load and the results are as expected. For the lower speed and high torque ZFM configuration there are initial big jumps in power output and input as the RPM increases due to the voltage rise. This impact, however diminishes as the voltage is raised to the maximum with the overall efficiency dropping as the voltage is increased. All the testing over the past two years does suggest the higher voltages do not contribute much beyond more heat and lower efficiency, at least for the present ZFM configuration.

The design limits of the current Torque testing method and BiPolar switch preclude pushing the performance to the torque limits possible under the higher voltages of 48v and 60v.