Cycle Analyst V3.1 User Manual
Rev 1.0
6.10 Temperature Sensor
The Cycle Analyst has a 2-pin input intended for motor temperature sensing.
Many motors supplied by Grin have a 10K NTC thermistor (Beta constant of
3900) prewired into the stator which can hook up to the CA3 through a 2-wire
extension cable. The firmware also supports most linear temperature sensor IC's
through a custom offset and scale factor.
The Cycle Analyst automatically reduces output power of the system when the
temperature is higher than the threshold temperature. It does this by scaling the
current limit from the maximum set point down to zero amps as the motor
temperature increases from the threshold to the maximum temperature.
When thermal rollback is active a flashing thermometer icon will alternate with
the battery SOC icon on the main screen, and the T flag will be active on the
diagnostics screen.
In general most hub motors can withstand core temperatures of up to 150 °C for
short times without suffering insulation damage or demagnetization, but it's
advisable both for headroom and motor efficiency to keep motor core
temperatures below about 110-120 °C.
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