Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-02-16
1991-11-12
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 54, 310 90, H02K 114, H02K 516, H02K 5128, H02K 3704
Patent
active
050650610
ABSTRACT:
An electromagnetic actuator for a valve stem comprising a stator core having concentratedly wound coils around salient poles and the stator is positioned outside of a tubular member made of a nonmagnetic material. The electromagnetic actuator for a valve stem also has a rotor provided inside the tubular member for driving a threaded operating shaft such that it operats an objective member reciprocally an electromagnetic actuator for a valve stem is further constructed such that permanent magnets, alternately magnetized into a number of pole-pairs, are arranged along the surface of each salient pole of the stator core at a constant pitch, while a number of induction teeth are formed along the circumference of the rotor at a pitch equal to the pitch of the pole-pairs of the permanent magnets. The difference between the total number of the induction teeth and the total number of the polepairs of the permanent magnets is made equal to an even number. The rotor is rotated and the operating shaft is driven when an electromagnetic actuator for a valve stem operates as a pulse motor by alternating excitation of the coils.
REFERENCES:
patent: 3733504 (1973-05-01), Dennis
patent: 3916231 (1975-10-01), Cathey
patent: 4184090 (1980-01-01), Taiani et al.
patent: 4713570 (1987-12-01), Mastromattei
patent: 4745312 (1988-05-01), Nagasaka
patent: 4948091 (1990-08-01), Satoh et al.
Harada Riichiroh
Koba Tatsuhiko
Nakano Jun
Satoh Ikumi
Kabushiki Kaisha Yasakawa Denki Seisakusho
Rebsch D.
Stephan Steven L.
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