A contactless power feeding system comprises a power feeding device and a movable device. The transmission family members include three planetary gear sets having seven torque-transmitting mechanisms and three fixed interconnections. An associated processing method including starting an operation related to a Conjunctive Normal Form Boolean expression comprising a conjunct or related to a Disjunctive Normal Form Boolean expression comprising a disjunct, evaluating the conjunct or disjunct, and selectively short-circuiting a portion of the Boolean expression. Then the temperature is slowly decreased to below the melting temperature of the semiconductor material. The computing circuit of motor control computes a current instruction value from a motor current value subjected to digital conversion by the AD converter 8 and a motor current instruction value etc.