Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2007-01-19
2009-08-11
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S026000, C310S049030
Reexamination Certificate
active
07573172
ABSTRACT:
A magnetic drive apparatus, which has a rotor; and a stator having a stator magnetic flux generator, and a stator magnetic guidepath for guiding magnetic flux from the stator magnetic flux generator to the rotor, and which rotationally drives the rotor relative to the stator by controlling the flow of the magnetic flux of the stator magnetic flux generator, the magnetic drive apparatus being constituted such that it further has magnetic flux controlling means, which is respectively stacked onto and bridges the rotor side end tip of the stator magnetic guidepath and a magnetic pole tip which is arranged at a prescribed angular location on the periphery of the rotor with a first gap with this end tip part, and magnetic flux controlling means has a function for magnetically reconnecting to the magnetic pole tip after controlling the flow of magnetic flux, which is blocked by the first gap. Consequently, there is no need for an excitation coil, power consumption is lowered by reducing the consumption of energy due to the copper loss of the excitation coil and so forth, and the driving apparatus can be made smaller, thinner and less expensively regardless of coil diameter.
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Citizen Holdings Co. Ltd.
Mullins Burton
Westerman, Hattori, Daniels & Adrian , LLP.
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