Patent ID: 8427090

Claim:
A magnetic-drive-pulsation motor comprising: a Permanent Magnet (PM) synchronous motor unit; a pulsator unit; and a control circuit, wherein said PM synchronous motor unit includes (i) a rotor including permanent magnets and (ii) a stator including solenoid coils, said pulsator unit includes magnetic cores and outer solenoids, said rotor and said magnetic cores are connected together by a shaft, said outer solenoids are connected to said stator, said magnetic cores are disposed such that an N-pole and an S-pole face each other across the shaft, said outer solenoids are disposed over an entire region of said stator, and said outer solenoids that are adjacent to each other or said outer solenoids that face each other across said magnetic cores are electrically connected to each other via semiconductor switches such that an induced current circulates as a circulating current, and said control circuit includes: a supply voltage detector that detects a supply voltage; a matrix converter that performs AC-AC conversion on the supply voltage; a zero crossing detection unit configured to detect a zero crossing of the supply voltage detected by said supply voltage detector; and a pulsator switch instruction calculation unit configured to issue (i) an instruction for turning ON only a semiconductor switch included in the semiconductor switches which corresponds to a closest one of said outer solenoids at the zero crossing detected by said zero crossing detection unit, when the supply voltage detected by said supply voltage detector falls at or below a half of a single-phase voltage of 100 volts, and (ii) an instruction for turning OFF all the semiconductor switches, when the supply voltage detected by said supply voltage detector exceeds the half of the single-phase voltage of 100 volts.