Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-07-04
2010-11-09
Nguyen, Tran N (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C318S607000, C318S632000
Reexamination Certificate
active
07830056
ABSTRACT:
An energy-saving magnetic bearing device with no bias current for making the relation between the excitation current and the magnetic force of the electromagnet linear is provided. In a magnetic bearing device for supporting a rotor1serving as the magnetic piece in a levitating state allowing free rotation at a specified position by the magnetic force of a pair of electromagnets2, 3, the electromagnets2, 3are constituted to interpose the rotor1and face each other. A driver204is a PWM (pulse width modulation) type driver for controlling the excitation current in the electromagnets2, 3by modulating the pulse width of a voltage driven at a specified carrier frequency fc, and includes a resonator means for electrically resonating at a frequency equal to the carrier frequency fc. When an excitation current flows in either one of the pair of opposing electromagnets2, 3, then the other magnet is regulated so that the DC component in the electromagnet excitation current is zero, and a voltage is applied via the resonator means to the electromagnet whose DC component in the excitation current is discharged to zero.
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International Search Report of PCT/JP2006/313340; date of mailing Oct. 31, 2006.
Barada Toshimitsu
Yoshida Toshiya
Ebara Corporation
Nguyen Tran N
Westerman Hattori Daniels & Adrian LLP
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