Theory of Device Operation

pump for 0.714 ms k (k: constant value). This makes the flowed current into the motor higher and the rotational speed up. When the actual rotational speed is faster than 4,200 rpm, the MPU discharges the pump the other way. This control (charging/discharging) is performed every 1 revolution.

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Fujitsu MHU2100AT manual Theory of Device Operation