Frankenrunner User Manual
Rev 1.0
and causes the motor windings to heat up. At low motor speeds this phase
current can be several times higher than the battery current you see on a
Cycle
Analyst
.
The “Max Power Limit” sets an upper limit on the total watts that will be allowed
to flow into the hub motor. This value has a similar effect to a battery current limit,
but it is dependent on voltage. A value of 2000 Watts will limit battery current to
27 amps with a 72V pack, while allowing over 40 amps with a 48V pack.
“Max Phase Current” determines the peak amps, and hence torque, put through
the motor while accelerating at full throttle assuming no other limits are reached.
The “Max Regen Phase Current” value directly sets the peak braking torque of
the motor at full regen. If you want a strong braking effect, then set this to the
same value as the forward phase current limit. If the maximum braking force is
too intense, then reduce its value.
The following graph illustrates the interplay between motor phase current, battery
current, and motor output power for a typical setup. When riding at full throttle,
low speeds will be phase current limited, medium speeds will be battery current
limited, and high speeds will be limited by the voltage of your battery pack.
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