Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-08-15
2006-08-15
Duda, Rina (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S773000, C318S779000
Reexamination Certificate
active
07091691
ABSTRACT:
An outer-rotor variable-speed motor, to which single-phase AC power is applied and on which a rotor is provided outside a stator, comprises first and second main windings provided on a stator of the motor to form a plurality of poles, a frequency detector for detecting the frequency of AC power applied to the motor, and a relay for connecting the first and second main windings in series if the detected frequency is 60 Hz and connecting the first and second main windings in parallel if the detected frequency is 50 Hz. The speed of the motor is kept constant even when power at different frequencies is applied, so that it is possible to reduce the manufacturing cost of the motor and reduce the power consumption, and also to reduce electromagnetic noise from the motor.
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U.S. Appl. No. 11/113,171, filed Apr. 25, 2005, to Kim et al.
Choi Byung Keol
Lee Tae Hee
Min Byoung Wook
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