I've been riding my 48V 700W e-Vespa-clone scoot, "Hummer," for about a year. Since I re-glued the stator magnets in the brush-type motor, it has had a pronounced buzzing "cogging" when not under power: hence the name. You can see it at:
Now a strange new problem has arisen.
The controller "stutters." At 80% to full throttle, the controller cuts out for 1/2 sec or so. Larger throttle settings produce longer cutout periods. (This is particularly obvious as the cogging returns when the power is cut.) It behaves very much like the low-voltage cutout, but the voltmeter is showing fully charged pack voltage at the time. The pack-controller connections seem to be solid, as are the electrical throttle connectors.
Any ideas on where to start to "debug" this? I assume this is a hall-effect throttle - there are three wires to it, and none of them acts like "ground," "source," or "wiper," as I expected. What voltages should I be seeing on the wires to a hall-effect throttle? Is it DC or some sort of PWM?
I just found:
and will be using that. Any other suggestions?
Puzzled in DC