Abstract: The present invention achieves a balanced discharging in a power storage system having a plurality of storage batteries connected in parallel. A power storage system comprises a plurality of storage batteries 100a-100f connected in parallel, a storage battery device 120 at least setting an output voltage value at discharge to each of the plurality of storage batteries 100a-100f. The storage battery device 120 includes a discharge control circuit 121 configured to assign at least one storage battery of the plurality of storage batteries for a master based on at least a battery residual capacity or a battery voltage and set the output voltage value so that the output voltage value differs between the master and the storage battery.

Abstract: In a sensorless brushless DC motor formed by a stator including a plurality of windings and a rotor including permanent magnet poles, inductances of the windings are detected while the rotor is stationary, and then, the angle of the stationary rotor is detected in accordance with the detected inductances.